Comment and/or doc changes. #822

Workflow file for this run

	# Flow-IPC
	# Copyright 2023 Akamai Technologies, Inc.
	#
	# Licensed under the Apache License, Version 2.0 (the
	# "License"); you may not use this file except in
	# compliance with the License. You may obtain a copy
	# of the License at
	#
	# https://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in
	# writing, software distributed under the License is
	# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
	# CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing
	# permissions and limitations under the License.

	name: Flow-IPC pipeline

	# Discussion on the philosophy behind the workflow (pipeline) below. The steps themselves should be easy enough to
	# follow, but what's the bigger picture? Answer: The pipeline below is an algorithm, as coded below, invoked
	# by GitHub on many runners (machines); and the inputs to this algorithm are:
	# - a branch (`main`, or a feature/PR branch) or tag (usually release tag v<version>);
	# - hence the current contents of that branch/tag;
	# - some trigger event that causes the workflow (pipeline) to run in the first place:
	# push to the branch/tag; pull request (PR) creation; or manual click by human (as of this writing usually
	# for testing or debugging only).
	# So given those inputs, what are the outputs or side effects? To answer, consider what jobs are actually run
	# (as parallel as possible). There's `setup` and `set-vars` as of this writing, but these are
	# purely tactical prerequisites and not worth discussing here; once they complete then the "real" jobs will run:
	# build-and-test and doc-and-release. Here are their goals, meaning outputs/side effects given the above
	# inputs:
	# - build-and-test:
	# - Summary: Test building and running the product; and bullet-proof it further via run-time sanitizers.
	# - Build the code, including demo/test code, at the given branch/tag in wide variety of compiler/build-type
	# combinations. The ability to build (including linking into test binaries) successfully is, of course,
	# a test in and of itself.
	# - Test that code by running the available unit test and integration test/demo binaries built in previous bullet.
	# If something fails, help (within reason) make it clear what failed and why.
	# - Output: Make any logs available, whether on success or failure. If console output is sufficient,
	# great: it'll be visible via GitHub Actions UI. If not, save the non-console log output in a log tarball
	# available as workflow artifact for download via GitHub Actions UI.
	# - All of the above but with certain run-time sanitizers (as of this writing ASAN/LSAN, UBSAN, TSAN,
	# and possibly clang-MSAN) enabled at build time as well. (RelWithDebInfo is a sufficient base build type
	# for a sanitizer-enabled build; a subset of compilers -- as opposed to all of them -- is also sufficient
	# for pragamtic reasons.)
	# - doc-and-release:
	# - Summary: 1, generate documentation from the source code (using Doxygen et al) and make it conveniently
	# available. 2, update GitHub Release and GitHub Pages web site with automatically with any relevant info, namely
	# with the generated docs and source code tarball/zip.
	# - Generate the documentation using Doxygen et al. The goal here is the canonical generated documentation, not
	# testing the ability to generate it. It's a subtle difference, but it's important to note it, because
	# if we wanted to test the ins and outs of doc generation in various environments then we could have a much more
	# complex and longer pipeline -- and perhaps we should... but that's not the goal here.
	# - Output: Make it available as workflow artfiact for download via GitHub Actions UI.
	# Hence human can simply download it, whether it's for the `main` tip or a specific release version.
	# - Side effect: (On pushes/merges to `main` branch only) Check-in the generated docs back into `main`
	# itself, so that (1) they're available for local perusal by any person cloning/pulling `main` and (2) ditto
	# for any downstream releases (which are mere tags of `main`).
	# - Side effect: Having done so, signal GitHub Pages web site for the org, so that the new `main` docs
	# are reflected at this web site. (It'll automatically clone `main`, copy the generated docs to web site
	# replacing the existing `main` docs if any, and stage this to the web.)
	# - (If the branch/tag input is, in fact, tag v* -- a release tag) The mere fact that a push to a release tag X
	# is being observed means we want:
	# - Side effect: Ensure that the GitHub Release X has the full source code available for human download
	# as a package (tarball/zip). I.e., upload it there as needed.
	# - Side effect: Ensure that the GitHub Pages web site actually lists this Release and its associated
	# generated documentation. I.e., signal Pages that there's a Release X now: it'll then do the right
	# thing (namely checkout the docs at the tag and copy them over; and add a link to the release and docs
	# in the appropriate web page).
	#
	# So, roughly speaking,
	# - build-and-test is about building and testing the product, including bullet-proofing it with sanitizers.
	# - doc-and-release is about official documentation-based-on-source being available in various customary ways;
	# with a side of official releases being accessible and comprehensively presented in customary ways.
	# - TODO: It could be argued that those 2 goals are related but separate, and perhaps they should be 2 separate
	# jobs. However, at least as of this writing, there's definite overlap between them, and combining the 2
	# makes pragamtic sense. It's worth revisiting periodically perhaps.

	on:
	# Want to merge to development tip? Should probably pass these builds/tests and doc generation first (the latter
	# in case the source change adds a Doxygen error or bad-looking docs). Note this runs on PR creation and update.
	pull_request:
	branches:
	- main
	push:
	# Was able to merge PR to `main` tip? Should ensure these builds/tests/doc generation still pass after the fact
	# (post-merge `main` does not always equal the PR-branch state); plus:
	# auto-check-in generated docs into `main` branch tip (and signal web site to update accordingly).
	branches:
	- main
	# Created release tag? Just in case, should ensure these builds/tests pass (just in case, but it's redundant
	# against the branch=main trigger above); generate docs and make them available as artifact (nice: docs for
	# a particular product version available online); plus:
	# signal web sites to update accordingly (there's probably a new release to present, with full source code attached;
	# and there are docs for; nice: docs a particular product version available online).
	tags:
	- v*
	# To create the button that runs a workflow manually: testing, debugging, demoing.
	workflow_dispatch:

	jobs:
	# Impetus behind this is to set up at least one magic string used in 2+ places.
	# Unfortunately simply using `env:` does not work, as jobs.<id>.if refuses to access the workflow-global `env.<id>`.
	# Ridiculous. TODO: Revisit.
	#
	# Folding this into `setup` would have been fine, but as of this writing `setup` needs at least one constant
	# from here, and getting the order of operations correct within that one job is non-trivial at best.
	set-vars:
	runs-on: ubuntu-latest
	steps:
	- name: Set variables/constants for subsequent use
	run: \|
	# Set variables/constants for subsequent use.
	outputs:
	doc-commit-message: (Commit by workflow script) Update generated documentation.

	# Impetus behind this is to gate whether the real jobs below actually need to run. Can of course also compute
	# other things as needed.
	setup:
	needs: set-vars
	runs-on: ubuntu-latest
	steps:
	- name: Checkout VERSION file and tag history
	uses: actions/checkout@v4
	with:
	sparse-checkout: VERSION
	fetch-depth: 0 # Get all history regarding tags. We'll need that for VERSION checking below.
	- name: Grab repository version from `VERSION` file
	id: repo_version
	run: \|
	# Grab repository version from `VERSION` file.
	if [ ! -e VERSION ]; then
	echo '::error ::No VERSION file in repository root. One must exist.'
	exit 1
	fi
	VERSION=`cat VERSION`
	echo "Determined version: [$VERSION]."
	echo "version=$VERSION" >> $GITHUB_OUTPUT
	- name: (On release creation only) Check repository version against release tag name
	if: success() && (!cancelled()) && startsWith(github.ref, 'refs/tags/v')
	run: \|
	# Check repository version against release tag name.
	VERSION=${{ steps.repo_version.outputs.version }}
	TAG_VERSION=${GITHUB_REF#refs/tags/v}
	if [ "$VERSION" = "$TAG_VERSION" ]; then
	echo ":notice ::Tag name and repo version are an exact match. Looks good."
	elif [[ "$TAG_VERSION" == "$VERSION-"* ]]; then
	echo "::notice ::Tag name [v$TAG_VERSION] starts with repo version (pre-release). Allowed."
	else
	echo "::error ::VERSION file version v[$VERSION] must = release tag name [v$TAG_VERSION]."
	echo "::error ::Suggest deleting release and tag, fixing VERSION if needed, and re-creating release/tag."
	exit 1
	fi
	# TODO: Would be nice to also grab release name and ensure it equals tag name v<...>.
	# Could be a separate step or just execute here if the above succeeded so far. Requires API fetch, so it's
	# a few lines.
	- name: (Except on release creation) Check repository version against already-existing release tag names
	if: success() && (!cancelled()) && (!startsWith(github.ref, 'refs/tags/v'))
	run: \|
	# Check repo version against release tag name.
	# Do not fail on account of VERSION in this path however... just warn or gently inform.
	VERSION=${{ steps.repo_version.outputs.version }}
	if git rev-parse "v$VERSION" >/dev/null 2>&1; then
	echo "::warning ::Tag [v$VERSION] already exists. The repo/VERSION file will require "\
	"a bump, before the next release. However this should be done just ahead of release creation and must "\
	"follow semantic versioning conventions, especially regarding when to bump major/minor/patch components. "\
	"When ready to do this consult [https://semver.org/] as needed."
	elif git tag \| grep -q "^v$VERSION-"; then
	echo "::notice ::Since pre-release tag(s) [v$VERSION-*] already exist(s), but no tag "\
	"[v$VERSION] exists, this repo state is likely intended for a later pre-release or official release. "\
	"Cool! However, reminder: "\
	"The repo/VERSION version should be decided/finalized just ahead of release creation and must "\
	"follow semantic versioning conventions, especially regarding when to bump major/minor/patch components. "\
	"When ready to do this consult [https://semver.org/] as needed."
	else
	echo "::notice ::Since no tag [v$VERSION] or [v$VERSION-*] exists, this repo state "\
	"is likely intended for a future release. Cool! However, reminder: "\
	"The repo/VERSION version should be decided/finalized just ahead of release creation and must "\
	"follow semantic versioning conventions, especially regarding when to bump major/minor/patch components. "\
	"When ready to do this consult [https://semver.org/] as needed."
	fi
	- id: compute_proceed_else_not
	name: Compute whether for main jobs to proceed or not
	# For checking whether github.event.head_commit.message starts with needs.set-vars.outputs.doc-commit-message
	# it is tempting to just use:
	# '${{ github.event.head_commit.message }}' != '${{ needs.set-vars.outputs.doc-commit-message }}'*
	# This works usually but is unsafe: If the head commit message contains, for example, a single-quote,
	# then the shell syntax breaks down. One approach would be to use pipeline startsWith() before `run`,
	# but apparently it cannot be done directly inside `run`; so it is a pain. Staying with shell scripting
	# then we can just use here-doc syntax and a temp file, so if the commit message does not have the
	# here-doc terminator token, then we're fine.
	run: \|
	# Compute whether for main jobs to proceed or not.
	TMP_MSG=/tmp/flow-ipc-pipeline-head-cmt-msg.txt
	cat <<'FLOW_IPC_PIPELINE_HEAD_CMD_MSG_EOF' > $TMP_MSG
	${{ github.event.head_commit.message }}
	FLOW_IPC_PIPELINE_HEAD_CMD_MSG_EOF
	if [ '${{ github.ref }}' != 'refs/heads/main' ] \|\| \
	[ '${{ github.event_name }}' != 'push' ] \|\| \
	! { head --lines=1 $TMP_MSG \| fgrep -xq '${{ needs.set-vars.outputs.doc-commit-message }}'; }; then
	echo 'proceed-else-not=true' >> $GITHUB_OUTPUT
	else
	echo 'proceed-else-not=false' >> $GITHUB_OUTPUT
	echo 'The real jobs will not run: earlier `doc-and-release` job checked-in generated docs to `main`.'
	echo 'That is not a source change and requires no actual pipeline to execute.'
	fi
	outputs:
	proceed-else-not: ${{ steps.compute_proceed_else_not.outputs.proceed-else-not }}

	build-and-test:
	needs: [setup, set-vars]
	if: \|
	needs.setup.outputs.proceed-else-not == 'true'

	strategy:
	fail-fast: false
	matrix:
	compiler:
	- id: gcc-9
	name: gcc
	version: 9
	c-path: /usr/bin/gcc-9
	cpp-path: /usr/bin/g++-9
	- id: gcc-10
	name: gcc
	version: 10
	c-path: /usr/bin/gcc-10
	cpp-path: /usr/bin/g++-10
	- id: gcc-11
	name: gcc
	version: 11
	c-path: /usr/bin/gcc-11
	cpp-path: /usr/bin/g++-11
	- id: gcc-13
	name: gcc
	version: 13
	c-path: /usr/bin/gcc-13
	cpp-path: /usr/bin/g++-13
	- id: clang-13
	name: clang
	version: 13
	c-path: /usr/bin/clang-13
	cpp-path: /usr/bin/clang++-13
	- id: clang-15
	name: clang
	version: 15
	c-path: /usr/bin/clang-15
	cpp-path: /usr/bin/clang++-15
	- id: clang-16
	name: clang
	version: 16
	c-path: /usr/bin/clang-16
	cpp-path: /usr/bin/clang++-16
	install: True
	- id: clang-17
	name: clang
	version: 17
	c-path: /usr/bin/clang-17
	cpp-path: /usr/bin/clang++-17
	install: True
	build-test-cfg:
	- id: debug
	conan-profile-build-type: Debug
	conan-profile-jemalloc-build-type: Debug
	# In any case Debug, at the CMake script (in meta-project ./, and in flow/, ipc_*/) level,
	# means LTO will be ignored (only Rel build-types enable LTO, if so instructed).
	# Still keeping this here to make that clear to the reader/maintainer. Could remove it though.
	no-lto: True
	- id: release
	conan-profile-build-type: Release
	conan-profile-jemalloc-build-type: Release
	# Leaving no-lto at default (false); full-on-optimized-no-debug is the quentessential LTO use case.
	- id: relwithdebinfo
	conan-profile-build-type: RelWithDebInfo
	conan-profile-jemalloc-build-type: Release
	# As of this writing RelWithDebInfo (in CMake, and Conan in our case at least doesn't override it)
	# defaults to -O2 (not -O3), which isn't a super-effective way of deploying LTO. Plus
	# we can use a test of non-LTO building.
	# TODO: Perhaps this should be a separate matrix dimension (LTO on, LTO off). Number of configs will
	# jump up, but it is more methodical and nice.
	no-lto: True
	- id: minsizerel
	conan-profile-build-type: MinSizeRel
	conan-profile-jemalloc-build-type: Release
	# Leaving no-lto at default (false); -Os (size-optimizing) with LTO on is pretty realistic.
	- id: relwithdebinfo-asan
	conan-profile-build-type: RelWithDebInfo
	conan-profile-jemalloc-build-type: Release
	conan-profile-custom-conf: \|
	# no-omit-frame-pointer recommended in (A\|UB\|M)SAN docs for nice stack traces.
	tools.build:cflags = ["-fsanitize=address", "-fno-omit-frame-pointer"]
	tools.build:cxxflags = ["-fsanitize=address", "-fno-omit-frame-pointer"]
	tools.build:sharedlinkflags = ["-fsanitize=address"]
	tools.build:exelinkflags = ["-fsanitize=address"]
	# jemalloc recipe needs this as of this writing (even though it dupes the stuff just-above conceptually).
	conan-profile-custom-buildenv: \|
	CXXFLAGS = -fsanitize=address -fno-omit-frame-pointer
	CFLAGS = -fsanitize=address -fno-omit-frame-pointer
	LDFLAGS = -fsanitize=address
	conan-profile-custom-settings: \|
	compiler.sanitizer = address
	conan-custom-settings-defs: \| # Could we not copy/paste these 4x?
	data['compiler']['gcc']['sanitizer'] = ['None', 'address', 'thread', 'memory', 'undefined']
	data['compiler']['clang']['sanitizer'] = ['None', 'address', 'thread', 'memory', 'undefined']
	sanitizer-name: asan # Used as internal enum of sorts + name of sanitizer-related dirs.
	# At least ASAN with clang + LTO => cryptic link error.
	# Regardless regular RelWithDebInfo already has no-lto=true; so we would follow suit. Just be aware
	# that changing it to false for whatever reason => ASAN probably breaks.
	no-lto: True
	- id: relwithdebinfo-ubsan
	conan-profile-build-type: RelWithDebInfo
	conan-profile-jemalloc-build-type: Release
	conan-profile-custom-conf: \|
	tools.build:cflags = ["-fsanitize=undefined", "-fno-omit-frame-pointer"]
	tools.build:cxxflags = ["-fsanitize=undefined", "-fno-omit-frame-pointer"]
	tools.build:sharedlinkflags = ["-fsanitize=undefined"]
	tools.build:exelinkflags = ["-fsanitize=undefined"]
	conan-profile-custom-buildenv: \|
	CXXFLAGS = -fsanitize=undefined -fno-omit-frame-pointer
	CFLAGS = -fsanitize=undefined -fno-omit-frame-pointer
	LDFLAGS = -fsanitize=undefined
	conan-profile-custom-settings: \|
	compiler.sanitizer = undefined
	conan-custom-settings-defs: \|
	data['compiler']['gcc']['sanitizer'] = ['None', 'address', 'thread', 'memory', 'undefined']
	data['compiler']['clang']['sanitizer'] = ['None', 'address', 'thread', 'memory', 'undefined']
	sanitizer-name: ubsan
	# While UBSAN might work with LTO, I do not want the aggravation/entropy. Turn it off.
	# Plus inheriting from regular RelWithDebInfo anyway.
	no-lto: True
	- id: relwithdebinfo-tsan
	conan-profile-build-type: RelWithDebInfo
	conan-profile-jemalloc-build-type: Release
	conan-profile-custom-conf: \|
	# no-omit-frame-pointer recommended in (A\|UB\|M)SAN docs for nice stack traces; TSAN docs do not
	# mention it. Given the various symbolizer problems mentioned elsewhere in comments in this file,
	# it seemed prudent to keep this consistent with those other *SAN.
	tools.build:cflags = ["-fsanitize=thread", "-fno-omit-frame-pointer"]
	tools.build:cxxflags = ["-fsanitize=thread", "-fno-omit-frame-pointer"]
	tools.build:sharedlinkflags = ["-fsanitize=thread", "-fno-omit-frame-pointer"]
	tools.build:exelinkflags = ["-fsanitize=thread", "-fno-omit-frame-pointer"]
	conan-profile-custom-buildenv: \|
	CXXFLAGS = -fsanitize=thread -fno-omit-frame-pointer
	CFLAGS = -fsanitize=thread -fno-omit-frame-pointer
	LDFLAGS = -fsanitize=thread -fno-omit-frame-pointer
	conan-profile-custom-settings: \|
	compiler.sanitizer = thread
	conan-custom-settings-defs: \|
	data['compiler']['gcc']['sanitizer'] = ['None', 'address', 'thread', 'memory', 'undefined']
	data['compiler']['clang']['sanitizer'] = ['None', 'address', 'thread', 'memory', 'undefined']
	sanitizer-name: tsan
	# While TSAN might work with LTO, I do not want the aggravation/entropy. Turn it off.
	# Also, for some clangs, there are TSAN WARNINGs at times about too-small symbolizer buffer or something;
	# throwing LTO into the mix seems like unnecessary entropy.
	# Plus inheriting from regular RelWithDebInfo anyway.
	no-lto: True
	- id: relwithdebinfo-msan
	conan-profile-build-type: RelWithDebInfo
	conan-profile-jemalloc-build-type: Release
	conan-profile-custom-conf: \|
	tools.build:cflags = ["-fsanitize=memory", "-fno-omit-frame-pointer", "-fsanitize-ignorelist=/tmp/msan_ignore_list.cfg"]
	tools.build:cxxflags = ["-fsanitize=memory", "-fno-omit-frame-pointer", "-fsanitize-ignorelist=/tmp/msan_ignore_list.cfg"]
	tools.build:sharedlinkflags = ["-fsanitize=memory"]
	tools.build:exelinkflags = ["-fsanitize=memory"]
	conan-profile-custom-buildenv: \|
	CXXFLAGS = -fsanitize=memory -fno-omit-frame-pointer -fsanitize-ignorelist=/tmp/msan_ignore_list.cfg
	CFLAGS = -fsanitize=memory -fno-omit-frame-pointer -fsanitize-ignorelist=/tmp/msan_ignore_list.cfg
	LDFLAGS = -fsanitize=memory
	conan-profile-custom-settings: \|
	compiler.sanitizer = memory
	conan-custom-settings-defs: \|
	data['compiler']['gcc']['sanitizer'] = ['None', 'address', 'thread', 'memory', 'undefined']
	data['compiler']['clang']['sanitizer'] = ['None', 'address', 'thread', 'memory', 'undefined']
	sanitizer-name: msan
	# While MSAN might work with LTO, I do not want the aggravation/entropy. Turn it off.
	# Plus inheriting from regular RelWithDebInfo anyway.
	no-lto: True

	# We concentrate on clang sanitizers; they are newer/nicer; also MSAN is clang-only. So gcc ones excluded.
	# Attention! Excluding some sanitizer job(s) (with these reasons):
	# - MSAN: MSAN protects against reads of ununitialized memory; it is clang-only (not gcc), unlike the other
	# *SAN. Its mission overlaps at least partially with UBSAN's; for example for sure there were a couple of
	# uninitialized reads in test code which UBSAN caught. Its current state -- if not excluded -- is as
	# follows: 1, due to (as of this writing) building dependencies, including the capnp compiler binary used
	# during our build process, with the same compiler build config as the real code, ignore-list entires had
	# to be added to get past these problems. 2, before main() in all our demos/tests Boost was doing some
	# global init which MSAN did not like and hence aborted before main(); these are now ignored as well.
	# 3, this got us into main() at least, but immediately cryptic aborts started, seemingly again originating
	# in Boost (but requires detailed investigation to really understand). At this point I (ygoldfel)
	# disabled MSAN and filed a ticket. The overall status: MSAN is said to be useful, even with UBSAN active,
	# but all resources including official docs indicate that it is a high-maintenance tool:
	# All linked code, including libc and libstdc++/libc++ (the former in our case as of this writing),
	# must be instrumented to avoid cryptic false positives. The good news is we do build other things
	# instrumented (Boost libs, jemalloc, capnp/kj, gtest); but not libstdc++ (which official docs recommend);
	# this can be done but requires more work (I would suggest switching to libc++ in that case from the
	# start, as the clang people made it and themselves build it instrumented for their testing).
	# So the bottom line: MSAN is a tough cookie and requires more work before enabling. In the meantime we
	# have many layers of protection, including ASAN and UBSAN and lots of unit and integration tests.
	# So this status quo is pretty good. TODO: Do the work/get MSAN functional/useful; un-exclude it then.
	# - *SAN with gcc: We concentrate on clang sanitizers; they are newer/nicer; having to worry about differences
	# between them is an excessive burden. So excluding gcc ASAN/UBSAN/TSAN.
	# - TODO: Consider reducing to the newest or most stable clang. Generally they just keep improving; the
	# chances of something being uncaught (incorrectly) with a later version are slim. Not impossible though.
	# Look into it. Update: As of this writing transport_test exercise mode/SHM-jemalloc sub-mode is
	# disabled for TSAN clang-17 due to instability of TSAN itself. So clearly when it comes to TSAN
	# (which is officially in beta as of clang-17), higher version does not mean everything is better.
	# Hence perhaps this to-do is more of a longer-term thing, when all the sanitizers stabilize, or when
	# we find a single very-stable config. Just remember we aren't testing the sanitizer or our code's
	# ability to be sanitized; we just want to detect any problems in the code -- however we get there.
	# - *SAN with clang-13 (but not 15+): As of this writing clang-13 produces some additional warnings,
	# at least in TSAN, which appear to be related to nearby non-race messages like
	# `==75454==WARNING: Symbolizer buffer too small`. As a result, we either have to eliminate the
	# latter problem (TODO: look into it) or suppress false-positive race warnings that might only look
	# like added problems due to the incomplete stack traces. In general scanning through clang-13-produced
	# TSAN output, there is a chaotic feel to it, when it comes to stack output. Meanwhile so far
	# there has been zero evidence that a lower-version clang has actual added problems versus the other
	# compiler-versions, due to generating code differently. Since we have at least 3 other compiler-versions
	# running all the SAN, I (ygoldfel) decided to exclude clang-13 SAN, until the chaotic *SAN messages can
	# be at least reduced. In the meantime our *SAN coverage is still quite good.
	exclude:
	- build-test-cfg: { id: relwithdebinfo-msan }
	- compiler: { id: gcc-9 }
	build-test-cfg: { id: relwithdebinfo-asan }
	- compiler: { id: gcc-10 }
	build-test-cfg: { id: relwithdebinfo-asan }
	- compiler: { id: gcc-11 }
	build-test-cfg: { id: relwithdebinfo-asan }
	- compiler: { id: gcc-13 }
	build-test-cfg: { id: relwithdebinfo-asan }
	- compiler: { id: clang-13 }
	build-test-cfg: { id: relwithdebinfo-asan }
	- compiler: { id: gcc-9 }
	build-test-cfg: { id: relwithdebinfo-ubsan }
	- compiler: { id: gcc-10 }
	build-test-cfg: { id: relwithdebinfo-ubsan }
	- compiler: { id: gcc-11 }
	build-test-cfg: { id: relwithdebinfo-ubsan }
	- compiler: { id: gcc-13 }
	build-test-cfg: { id: relwithdebinfo-ubsan }
	- compiler: { id: clang-13 }
	build-test-cfg: { id: relwithdebinfo-ubsan }
	- compiler: { id: gcc-9 }
	build-test-cfg: { id: relwithdebinfo-tsan }
	- compiler: { id: gcc-10 }
	build-test-cfg: { id: relwithdebinfo-tsan }
	- compiler: { id: gcc-11 }
	build-test-cfg: { id: relwithdebinfo-tsan }
	- compiler: { id: gcc-13 }
	build-test-cfg: { id: relwithdebinfo-tsan }
	- compiler: { id: clang-13 }
	build-test-cfg: { id: relwithdebinfo-tsan }

	# Not using ubuntu-latest, so as to avoid surprises with OS upgrades and such.
	runs-on: ubuntu-22.04

	name: ${{ matrix.compiler.id }}-${{ matrix.build-test-cfg.id }}

	env:
	build-dir: ${{ github.workspace }}/build/${{ matrix.build-test-cfg.conan-profile-build-type }}
	install-root-dir: ${{ github.workspace }}/install/${{ matrix.build-test-cfg.conan-profile-build-type }}
	# (Unfortunately cannot refer to earlier-assigned `env.` entries within subsequent ones.)
	install-dir: ${{ github.workspace }}/install/${{ matrix.build-test-cfg.conan-profile-build-type }}/usr/local
	# Target file, as read by sanitized executable being invoked.
	san-suppress-cfg-file: ${{ github.workspace }}/install/${{ matrix.build-test-cfg.conan-profile-build-type }}/usr/local/bin/san_suppressions.cfg
	# Relative path (including file name) to suppressions file in a given context (which is given as dir name off
	# which this path works). Possible contexts as of this writing: ${{ github.workspace }}/<module>/src
	# (suppressions endemic to lib<module>); ${{ github.workspace }}/.../<test's source code dir>
	# (suppressions endemic to that test specifically). This suppressions file holds the compiler-version-independent
	# entries. (Malformed and ignored if matrix.build-test-cfg is not `*san`, meaning not sanitizer-enabled.)
	san-suppress-cfg-in-file1: sanitize/${{ matrix.build-test-cfg.sanitizer-name }}/suppressions_${{ matrix.compiler.name }}.cfg
	# Same but contains compiler version-specific entries (on top of those in san-suppress-cfg-file).
	san-suppress-cfg-in-file2: sanitize/${{ matrix.build-test-cfg.sanitizer-name }}/suppressions_${{ matrix.compiler.name }}_${{ matrix.compiler.version }}.cfg
	# Run-time controls for various sanitizers. Invoke before running test but after assembling suppressions
	# file ${{ env.san-suppress-cfg-file}} if any (clear it if needed, as it might be left-over from a previous
	# test). The proper technique is: 1, which of the suppression contexts (see above) are relevant?
	# (Safest is to specify all contexts; as you'll see just below, it's fine if there are no files in a given
	# context. However it would make code tedious to specify that way everywhere; so it's fine to skip contexts where
	# we know that these days there are no suppresisons.) Let the contexts' dirs be $DIR_A, $DIR_B, .... Then:
	# 2, `{ cat $DIR_A/${{ env.san-suppress-cfg-in-file1 }} $DIR_A/${{ env.san-suppress-cfg-in-file2 }} \
	# $DIR_B/${{ env.san-suppress-cfg-in-file1 }} $DIR_B/${{ env.san-suppress-cfg-in-file2 }} \
	# ... \
	# > ${{ env.san-suppress-cfg-file }} 2> /dev/null; } \|\| true`
	# 3, {{ env.setup-tests-env }}.
	#
	# Notes about items in *SAN_OPTIONS:
	#
	# Unclear if we need disable_coredump=0; it might be a gcc thing due to historic
	# issues with core size with ASAN; it is not documented in the clang *SAN docs for any
	# sanitizers; but it is accepted for ASAN and TSAN, seemingly, and maybe is at worst
	# harmless with out compiler versions. TODO: Maybe revisit.
	#
	# print_stacktrace=1 for UBSAN is recommended by documentation for nice stack traces
	# (also that is why we apply sanitizers to RelWithDebInfo; DebInfo part for the nice
	# stack traces/etc.; Rel part to reduce the considerable slowdown from some of the
	# sanitizers).
	#
	# second_deadlock_stack=1 for TSAN: TODO: Explain. Don't see it in clang TSAN docs.
	#
	# Caution! Setting multiple *SAN_OPTIONS (while invoking only 1 sanitizer, as we do)
	# seems like it would be harmless and avoid the `if/elif`s... but is actually a
	# nightmare; there is some interaction in clang (at least 13-17) which causes the
	# wrong sanitizer reading suppressions from another one => suppression parse error =>
	# none of the demos/tests get anywhere at all. So set just the right one!
	setup-tests-env: \|
	if [ '${{ matrix.build-test-cfg.sanitizer-name }}' = asan ]; then
	export ASAN_OPTIONS='disable_coredump=0'
	echo "ASAN_OPTIONS = [$ASAN_OPTIONS]."
	elif [ '${{ matrix.build-test-cfg.sanitizer-name }}' = ubsan ]; then
	export SAN_SUPP=1
	export SAN_SUPP_CFG=${{ github.workspace }}/install/${{ matrix.build-test-cfg.conan-profile-build-type }}/usr/local/bin/san_suppressions.cfg
	export UBSAN_OPTIONS="disable_coredump=0 print_stacktrace=1 suppressions=$SAN_SUPP_CFG"
	echo "UBSAN_OPTIONS = [$UBSAN_OPTIONS]."
	elif [ '${{ matrix.build-test-cfg.sanitizer-name }}' = tsan ]; then
	export SAN_SUPP=1
	export SAN_SUPP_CFG=${{ github.workspace }}/install/${{ matrix.build-test-cfg.conan-profile-build-type }}/usr/local/bin/san_suppressions.cfg
	export TSAN_OPTIONS="disable_coredump=0 second_deadlock_stack=1 suppressions=$SAN_SUPP_CFG"
	echo "TSAN_OPTIONS = [$TSAN_OPTIONS]."
	fi
	if [ "$SAN_SUPP" != '' ]; then
	echo 'Sanitizer [${{ matrix.build-test-cfg.sanitizer-name }}] suppressions cfg contents:'
	echo '[[[ file--'
	cat $SAN_SUPP_CFG
	echo '--file ]]]'
	fi
	# Must execute this ahead of any command that might at any point execute any binary built using the
	# build-and-test build config. In addition, must then preface any such command with: $BUILT_CMD_PREFIX.
	# Rationale: For most situations this is unnecessary, and the script will do nothing, while $BUILT_CMD_PREFIX
	# will be empty as a result. It is necessary only when the "target" command would execute at least one
	# program that was built with TSAN or ASAN sanitizer (TODO: MSAN too? unknown at the moment) flags.
	# Unfortunately, in that case, ASLR (virtual address randomization) performed by at least Linux kernel
	# can randomly tickle a bug/problem in clang sanitizers (apparently fixed in clang-18 in late 2023) which
	# causes a message like `FATAL: ThreadSanitizer: unexpected memory mapping 0x767804872000-0x767804d00000`
	# to be immediately printed, with program instantly exiting failingly. This would at least be obvious, if
	# it's our actual code (a demo/test) failing: we can see it in the logs; but since we build deps (like jemalloc)
	# with the same compile/link settings (e.g., -fsanitizer=thread), the problem can manifest as early as
	# the configure step of something like jemalloc or m4; so configure will mysteriously fail with messages
	# such as `checking size of void *... 0 / configure: error: Unsupported pointer size: 0`. Really, though,
	# it is a `configure`-created test C program that errors-out as shown before (can be seen in config.log which
	# has to be uploaded as an artifact to even see it... a pain). Anyway! The easiest work-around was
	# suggested in https://stackoverflow.com/questions/5194666/disable-randomization-of-memory-addresses:
	# disable ASLR by using `setarch` which then invokes whatever command you wanted in the first place.
	# This should not affect our test coverage (in fact it perhaps make it more repeatable which is good);
	# and the security aspects of ASLR are not a real factor in our context.
	#
	# TODO: Revisit, particularly when adding more `clang`s and/or other compilers with which TSAN and ASAN
	# are enabled. Also see about MSAN (as of this writing it is disabled for orthogonal reasons, so it's moot).
	setup-run-env: \|
	if [ '${{ matrix.build-test-cfg.sanitizer-name }}' = asan ]; then
	export BUILT_CMD_PREFIX='setarch -R'
	echo 'Shall use `setarch -R` to disable ASLR to avoid ASAN-built binary misbehavior.'
	elif [ '${{ matrix.build-test-cfg.sanitizer-name }}' = tsan ]; then
	export BUILT_CMD_PREFIX='setarch -R'
	echo 'Shall use `setarch -R` to disable ASLR to avoid TSAN-built binary misbehavior.'
	fi
	# TODO: Ideally would go, like other things, under github.workspace somewhere (maybe build/),
	# but that var isn't available in `strategy` up above, where we specify the compiler option
	# pointing to this file. Surely we could cook something up; but meanwhile /tmp works fine.
	msan-ignore-list-cfg-file: /tmp/msan_ignore_list.cfg

	steps:
	- name: Update available software list for apt-get
	run: \|
	# Update available software list for apt-get.
	lsb_release -a
	sudo apt-get update

	- name: Install clang compiler
	if: \|
	matrix.compiler.install && (matrix.compiler.name == 'clang')
	run: \|
	# Install clang compiler.
	wget https://apt.llvm.org/llvm.sh
	chmod u+x llvm.sh
	sudo ./llvm.sh ${{ matrix.compiler.version }}

	- name: Install gcc compiler
	if: \|
	matrix.compiler.install && (matrix.compiler.name == 'gcc')
	run: \|
	# Install gcc compiler.
	sudo apt-get install -y software-properties-common
	sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
	sudo apt-get update
	sudo apt-get install -y gcc-${{ matrix.compiler.version }} g++-${{ matrix.compiler.version }}

	# We get highest 1.x, instead of 2+, because there are certain dependency recipe issues (namely for jemalloc)
	# with 2+. TODO: 1, expound more clearly here or elsewhere what those issues are; 2, solve those issues and
	# thus move to Conan 2+; Conan 1.x is officially on "deprecation path." This will also help resolve some other
	# to-dos more easily (targeting different build settings at built product source versus tools used to build it
	# = prime example).
	- name: Install the latest version of Conan which is less than 2
	run: pip install 'conan<2'

	- name: Checkout `ipc` repository and submodules (`flow`, `ipc_*`)
	uses: actions/checkout@v4
	with:
	submodules: true

	- name: Add custom settings for Conan packages
	if: \|
	matrix.build-test-cfg.conan-custom-settings-defs
	run: \|
	# Add custom settings for Conan packages.
	conan config init
	pip install PyYAML
	CONAN_SETTINGS_PATH=$(conan config home)/settings.yml
	python -c "

	import yaml

	with open('$CONAN_SETTINGS_PATH', 'r') as file:
	data = yaml.safe_load(file)

	${{ matrix.build-test-cfg.conan-custom-settings-defs }}

	with open('$CONAN_SETTINGS_PATH', 'w') as file:
	yaml.dump(data, file)
	"

	# Important info/somewhat important TODO: The C[XX]FLAGS and linker-flags are supplied via
	# ${{ matrix.build-test-cfg.conan-profile-custom-conf }} and
	# ${{ matrix.build-test-cfg.conan-profile-custom-buildenv }}. These affect not just our objects/libs/executables;
	# but also at least: 3rd party libs (jemalloc, capnp/kj, boost, gtest), 3rd party executables
	# (capnp compiler binary; temp binaries created by auto-tools configure scripts to test features).
	# In the case of the libs that's usually good; in particular things like
	# -fsanitize=address (ASAN) (for build-type relwithdebinfo-asan) ideally are applied to all built code
	# uniformly. (There are other libs being built, one can see: at least openssl and zlib; they're not really
	# involved in our actual product, at least not in a core way, so for those it arguably matters less either way.)
	# In the case of the binaries it is usually bad; we want the fastest, most normal tools possible, not ones
	# built weirdly with whatever settings we're trying to test with our own software. For one it makes those
	# tools slower -- perhaps not the hugest deal in practice here -- but it also generally increases entropy; and
	# it has also resulted in various pain:
	# - Cannot use -fno-sanitize-recover with UBSAN (abort program on warning) if we wanted to: it causes some
	# hidden configure-script-generated binary abort => capnp binary build fails.
	# - capnp binary fails MSAN at startup; hence capnp-compilation of our .capnp schemas fails.
	# We have worked around all these, so the thing altogether works. It's just somewhat odd and entropy-ridden;
	# and might cause maintanability problems over time, as it has already in the past.
	# The TODO is to be more judicious about it
	# and only apply these things to the libs/executables we want it applied. It is probably not so simple;
	# but worst-case it should be possible to use something like build-type-cflags-override to target our code;
	# and per-recipe (Boost, jemalloc, gtest...) techniques to target others; and not use the aggressive
	# conan-profile-custom-conf and conan-profile-custom-buildenv. That said, there will be interesting subtleties
	# like: libcapnp/kj are linked into capnp compiler binary; and to our code. So we should instrument it with
	# sanitizer (when applicable); now some of the capnp-compiler-binary is instrumented; some isn't. Would that
	# work, or would it be better to build capnp twice then (once for the binary, once for the linked libraries)?
	- name: Create Conan profile
	run: \|
	# Create Conan profile.
	cat <<'EOF' > conan_profile
	[settings]
	compiler = ${{ matrix.compiler.name }}
	compiler.version = ${{ matrix.compiler.version }}
	compiler.cppstd = 17
	# TODO: Consider testing with LLVM-libc++ also (with clang anyway).
	compiler.libcxx = libstdc++11
	arch = x86_64
	os = Linux
	jemalloc:build_type = ${{ matrix.build-test-cfg.conan-profile-jemalloc-build-type }}
	build_type = ${{ matrix.build-test-cfg.conan-profile-build-type }}
	${{ matrix.build-test-cfg.conan-profile-custom-settings }}

	[conf]
	tools.env.virtualenv:auto_use = True
	tools.build:compiler_executables = {"c": "${{ matrix.compiler.c-path }}", "cpp": "${{ matrix.compiler.cpp-path }}"}
	${{ matrix.build-test-cfg.conan-profile-custom-conf }}

	[buildenv]
	CC = ${{ matrix.compiler.c-path }}
	CXX = ${{ matrix.compiler.cpp-path }}
	${{ matrix.build-test-cfg.conan-profile-custom-buildenv }}

	[options]
	flow:doc = False
	flow:build = True
	ipc:doc = False
	ipc:build = True
	EOF
	# (Oddly enough `no-lto: True` and `...: False` do still evaluate as `true` and `false` respectively.
	# Hence why this compares against `false` and not `False`....)
	if [ '${{ matrix.build-test-cfg.no-lto }}' != '' ] && [ '${{ matrix.build-test-cfg.no-lto }}' != 'false' ]; then
	echo 'ipc:build_no_lto = True' >> conan_profile
	fi
	if [ '${{ matrix.build-test-cfg.build-type-cflags-override }}' != '' ]; then
	echo 'ipc:build_type_cflags_override = ${{ matrix.build-test-cfg.build-type-cflags-override }}' >> conan_profile
	fi

	# We need to prepare a sanitizer ignore-list in MSAN mode. Background for this is subtle and annoying:
	# As it stands, whatever matrix compiler/build-type is chosen applies not just to our code (correct)
	# and 3rd party libraries we link like lib{boost_*\|capnp\|kj\|jemalloc} (semi-optional but good) but also
	# unfortunately any items built from source during "Install Flow-IPC dependencies" step that we then
	# use during during the build step for our own code subsequently. At a minimum this will slow down
	# such programs. (For the time being we accept this as not-so-bad; to target this config at some things
	# but not others is hard/a ticket.) In particular, though, the capnp compiler binary is built this way;
	# and our "Build targets" step uses it to build key things (namely convert .capnp schemas into .c++
	# and .h sources which are then themselves compiled/used in compilation). In the case of MSAN, this
	# version of capnp compiler happens to trigger several MSAN failures (presumably they are not a true
	# problem, and it's not our job really to sanitize capnp -- though we can file tickets for them and/or
	# issue PRs; but I digress). So in MSAN mode our build step fails, when capnp compiler itself aborts
	# with MSAN failures. One approach is to not apply MSAN to capnp compiler (no-go for now; it's a ticket
	# as mentioned); another is to uses Conan to patch capnp package for them (not a bad idea; ticket filed);
	# and lastly we can put the specific failures on the ignore-list for MSAN. For now we do that; while
	# unpleasant it does get the job done. TODO: Revisit/resolve tickets/improve (see above).
	- name: Prepare MSAN sanitizer compile-time config file(s)
	if: \|
	(!cancelled()) && (matrix.build-test-cfg.sanitizer-name == 'msan')
	run: \|
	# Prepare MSAN sanitizer compile-time config file(s).
	cat <<'EOF' > $${ env.msan-ignore-list-cfg-file }}
	[memory]
	# Warning: In clang-18 there are breaking changes in how globs/regexes are interpreted. See docs.
	# Currently assuming clang-17 or lower.
	#
	# capnp compiler MSAN failures suppressed:
	src:/kj/filesystem-disk-unix.
	src:*/bits/stl_tree.h
	EOF
	# Append to that the suppressed items from the source tree. These apply to the real code being
	# built below, so just stylistically it is nicer to keep them there along with other
	# sanitizers' suppressions. (Note, though, that MSAN does not have a run-time suppression
	# system; only these ignore-lists. The others do also have ignore-lists though.
	# The format is totally different between the 2 types of suppression.)
	# Our MSAN support is budding compared to UBSAN/ASAN/TSAN; so just specify the one ingore-list file
	# we have now. TODO: If/when MSAN support gets filled out like the others', then use a context system
	# a-la env.setup-tests-env.
	cat ${{ github.workspace }}/flow/src/sanitize/msan/ignore_list_${{ matrix.compiler.name }}.cfg \
	>> $${ env.msan-ignore-list-cfg-file }}
	echo 'The combined MSAN ignore-list config file follows:'
	cat $${ env.msan-ignore-list-cfg-file }}

	- name: Install Flow-IPC dependencies with Conan using the profile
	run: \|
	# Install Flow-IPC dependencies with Conan using the profile.
	${{ env.setup-run-env }}
	FLOW_VERSION=`cat flow/VERSION`
	conan editable add flow flow/$FLOW_VERSION
	# At least `configure` mini-programs are built with our build-settings, so $BUILD_CMD_PREFIX is required.
	$BUILT_CMD_PREFIX \
	conan install . \
	--profile:build conan_profile --profile:host conan_profile --build missing \|\| FAILED=yep
	# Dep build failure is easy to diagnose from stdout/err, unless it happens during a `configure`;
	# then it'll often print something insane like "checking size of void *... 0" and suggest looking at
	# config.log... which will usually reveal the true problem, like a seg-fault or TSAN-triggered problem
	# running the configure-generated test program. So let's get all the `config.log`s we can find
	# and put them where later the log artifact tarball will be sourced; recreate the same dir structure as
	# in the Conan dep build area, but include only the `config.log` files. Note: This is probably only truly
	# useful if indeed the above command fails; but can't hurt to include it regardless.
	SRC=/home/runner/.conan/data
	DST=${{ env.install-dir }}/bin/logs/dep_build/conan-data
	find $SRC -name config.log \| while read -r config_log; do
	# Remove the $SRC part of the path to get a relative path.
	REL_PATH="${config_log#$SRC/}"
	# Determine the directory path within $DST where the config.log should be copied.
	DST_DIR="$DST/${REL_PATH%/*}"
	mkdir -p "$DST_DIR"
	cp -v "$config_log" "$DST_DIR"
	done
	[ "$FAILED" != yep ]

	- name: Build libraries and demos/tests with Conan
	run: \|
	# Build libraries and demos/tests with Conan.
	${{ env.setup-run-env }}
	# At least capnp compiler binary is built with our build-settings, so $BUILD_CMD_PREFIX is required.
	$BUILT_CMD_PREFIX conan build .

	- name: Install built targets with Makefile
	run: \|
	make install \
	--directory ${{ env.build-dir }} DESTDIR=${{ env.install-root-dir }}
	# Save runner space: blow away build dir after install.
	rm -rf ${{ env.build-dir }}

	# From now on use !cancelled() to try to run any test/demo that exists regardless
	# of preceding failures if any. Same-ish (always()) with the log-upload at the end.
	# Worst-case they'll all fail in super-basic ways and immediately; no extra harm done.

	# From now on save logs in install-dir/bin/logs. They will be tarred up and uploaded
	# as artifacts at the end. For those tests below that produce separate logs as files
	# to begin-with, this is a no-brainer. For those (as of this writing the main one
	# is unit_test; but also the link tests produce short logs too) who use stdout/stderr
	# the reason to do this is 2-fold.
	# - UBSAN in particular produces non-fatal error output about problems it detects.
	# We need to analyze them after the fact and fail a step below in that case to
	# alert developers who would then fix such new problems.
	# - One can also build UBSAN-mode things with -fno-sanitize-recover which would
	# cause abnormal program exit on first error. We do not do this for these
	# reasons:
	# - It is more convenient to let it continue and thus show all problems in one
	# shot.
	# - There is a side problem: At this time compile settings, including
	# in UBSAN case `-fsanitize=undefined -fno-sanitize-recover`, are applied not
	# just to our code or 3rd party libraries but also any other stuff built
	# (due to setting C[XX]FLAGS in Conan profile). Targeting just the exact
	# stuff we want with those is hard and a separate project/ticket.
	# In the meantime -fno-sanitize-recover causes completely unrealted program
	# halts during the very-early step, when building dependencies including
	# capnp; some autotools configure.sh fails crazily, and nothing can work
	# from that point on due to dependencies-install step failing. So at this
	# time -fno-sanitize-recover is a no-go; it affects too much unrelated stuff.
	# - It is more consistent/convenient to get all the bulky logs in one place as an
	# artifact, rather than some in the pipeline output, others in the artifacts.
	# (This preference is subjective, yes.)

	# Here, as in all other tests below, we assemble a suppressions file in case this is a sanitized
	# run; and we follow the procedure explained near setup-tests-env definition. To reiterate: to avoid
	# tedium, but at the cost of mantainability of this file (meaning if a suppressions context is added then
	# a few lines would need to be added here), we only list those contexts where any sanitizer has
	# any suppression; otherwise we skip it for brevity. `find . -name 'suppressions*.cfg` is pretty useful
	# to determine their presence in addition to whether the test itself has its specific suppressions of any kind.
	- name: Run link test [`ipc_core` - Flow-IPC Core]
	if: \|
	!cancelled()
	run: \|
	# Run link test [`ipc_core` - Flow-IPC Core].
	cd ${{ env.install-dir }}/bin
	OUT_DIR=logs/ipc_core_link_test
	mkdir -p $OUT_DIR
	SUPP_DIR_A=${{ github.workspace }}/flow/src
	{ cat $SUPP_DIR_A/${{ env.san-suppress-cfg-in-file1 }} $SUPP_DIR_A/${{ env.san-suppress-cfg-in-file2 }} \
	> ${{ env.san-suppress-cfg-file }} 2> /dev/null; } \|\| true
	${{ env.setup-tests-env }}
	${{ env.setup-run-env }}
	$BUILT_CMD_PREFIX \
	./ipc_core_link_test.exec $OUT_DIR/log.log > $OUT_DIR/console.log 2>&1

	- name: Run link test [`ipc_transport_structured` - Flow-IPC Structured Transport]
	if: \|
	!cancelled()
	run: \|
	# Run link test [`ipc_transport_structured` - Flow-IPC Structured Transport].
	cd ${{ env.install-dir }}/bin
	OUT_DIR=logs/ipc_transport_structured_link_test
	mkdir -p $OUT_DIR
	SUPP_DIR_A=${{ github.workspace }}/flow/src
	{ cat $SUPP_DIR_A/${{ env.san-suppress-cfg-in-file1 }} $SUPP_DIR_A/${{ env.san-suppress-cfg-in-file2 }} \
	> ${{ env.san-suppress-cfg-file }} 2> /dev/null; } \|\| true
	${{ env.setup-tests-env }}
	${{ env.setup-run-env }}
	$BUILT_CMD_PREFIX \
	./ipc_transport_structured_link_test.exec $OUT_DIR/log.log > $OUT_DIR/console.log 2>&1

	- name: Run link test [`ipc_session` - Flow-IPC Sessions]
	if: \|
	!cancelled()
	run: \|
	# Run link test [`ipc_session` - Flow-IPC Sessions].
	cd ${{ env.install-dir }}/bin
	OUT_DIR=logs/ipc_session_link_test
	mkdir -p $OUT_DIR
	SUPP_DIR_A=${{ github.workspace }}/flow/src
	SUPP_DIR_B=${{ github.workspace }}/ipc_session/src
	{ cat $SUPP_DIR_A/${{ env.san-suppress-cfg-in-file1 }} $SUPP_DIR_A/${{ env.san-suppress-cfg-in-file2 }} \
	$SUPP_DIR_B/${{ env.san-suppress-cfg-in-file1 }} $SUPP_DIR_B/${{ env.san-suppress-cfg-in-file2 }} \
	> ${{ env.san-suppress-cfg-file }} 2> /dev/null; } \|\| true
	${{ env.setup-tests-env }}
	${{ env.setup-run-env }}
	$BUILT_CMD_PREFIX \
	./ipc_session_link_test_srv.exec $OUT_DIR/srv.log > $OUT_DIR/srv.console.log 2>&1 &
	SRV_PID=$!
	sleep 1
	$BUILT_CMD_PREFIX \
	./ipc_session_link_test_cli.exec $OUT_DIR/cli.log > $OUT_DIR/cli.console.log 2>&1
	if wait $SRV_PID; then SRV_EC=0; else SRV_EC=$?; fi
	[ $SRV_EC -eq 0 ]

	- name: Run link test [`ipc_shm` - Flow-IPC Shared Memory]
	if: \|
	!cancelled()
	run: \|
	# Run link test [`ipc_shm` - Flow-IPC Shared Memory].
	cd ${{ env.install-dir }}/bin
	OUT_DIR=logs/ipc_shm_link_test
	mkdir -p $OUT_DIR
	SUPP_DIR_A=${{ github.workspace }}/flow/src
	SUPP_DIR_B=${{ github.workspace }}/ipc_session/src
	{ cat $SUPP_DIR_A/${{ env.san-suppress-cfg-in-file1 }} $SUPP_DIR_A/${{ env.san-suppress-cfg-in-file2 }} \
	$SUPP_DIR_B/${{ env.san-suppress-cfg-in-file1 }} $SUPP_DIR_B/${{ env.san-suppress-cfg-in-file2 }} \
	> ${{ env.san-suppress-cfg-file }} 2> /dev/null; } \|\| true
	${{ env.setup-tests-env }}
	${{ env.setup-run-env }}
	$BUILT_CMD_PREFIX \
	./ipc_shm_link_test_srv.exec $OUT_DIR/srv.log > $OUT_DIR/srv.console.log 2>&1 &
	SRV_PID=$!
	sleep 1
	$BUILT_CMD_PREFIX \
	./ipc_shm_link_test_cli.exec $OUT_DIR/cli.log > $OUT_DIR/cli.console.log 2>&1
	if wait $SRV_PID; then SRV_EC=0; else SRV_EC=$?; fi
	[ $SRV_EC -eq 0 ]

	- name: Run link test [`ipc_shm_arena_lend` - Flow-IPC SHM-jemalloc]
	if: \|
	!cancelled()
	run: \|
	# Run link test [`ipc_shm_arena_lend` - Flow-IPC SHM-jemalloc].
	cd ${{ env.install-dir }}/bin
	OUT_DIR=logs/ipc_shm_arena_lend_link_test
	mkdir -p $OUT_DIR
	SUPP_DIR_A=${{ github.workspace }}/flow/src
	SUPP_DIR_B=${{ github.workspace }}/ipc_session/src
	SUPP_DIR_C=${{ github.workspace }}/ipc_shm_arena_lend/src
	{ cat $SUPP_DIR_A/${{ env.san-suppress-cfg-in-file1 }} $SUPP_DIR_A/${{ env.san-suppress-cfg-in-file2 }} \
	$SUPP_DIR_B/${{ env.san-suppress-cfg-in-file1 }} $SUPP_DIR_B/${{ env.san-suppress-cfg-in-file2 }} \
	$SUPP_DIR_C/${{ env.san-suppress-cfg-in-file1 }} $SUPP_DIR_C/${{ env.san-suppress-cfg-in-file2 }} \
	> ${{ env.san-suppress-cfg-file }} 2> /dev/null; } \|\| true
	${{ env.setup-tests-env }}
	${{ env.setup-run-env }}
	$BUILT_CMD_PREFIX \
	./ipc_shm_arena_lend_link_test_srv.exec $OUT_DIR/srv.log > $OUT_DIR/srv.console.log 2>&1 &
	SRV_PID=$!
	sleep 1
	$BUILT_CMD_PREFIX \
	./ipc_shm_arena_lend_link_test_cli.exec $OUT_DIR/cli.log > $OUT_DIR/cli.console.log 2>&1
	if wait $SRV_PID; then SRV_EC=0; else SRV_EC=$?; fi
	[ $SRV_EC -eq 0 ]

	- name: Run unit tests
	if: \|
	!cancelled()
	run: \|
	# Run unit tests.
	cd ${{ env.install-dir }}/bin
	# Some newline issues with the possible additional args; so need to make a wrapper script
	# and then redirect, as desired, its output.
	cat <<'EOF' > ${{ env.install-dir }}/bin/run_unit_test.sh
	$BUILT_CMD_PREFIX ./libipc_unit_test.exec "$@"
	EOF
	RUN_IT='/usr/bin/bash -e ${{ env.install-dir }}/bin/run_unit_test.sh'
	OUT_DIR=logs/libipc_unit_test
	mkdir -p $OUT_DIR
	SUPP_DIR_A=${{ github.workspace }}/flow/src
	SUPP_DIR_B=${{ github.workspace }}/ipc_session/src
	SUPP_DIR_C=${{ github.workspace }}/ipc_shm_arena_lend/src
	# As of this writing there are TSAN suppressions for this test specifically. TODO: Revisit them; and then this.
	SUPP_DIR_OWN=${{ github.workspace }}/test/suite/unit_test
	{ cat $SUPP_DIR_A/${{ env.san-suppress-cfg-in-file1 }} $SUPP_DIR_A/${{ env.san-suppress-cfg-in-file2 }} \
	$SUPP_DIR_B/${{ env.san-suppress-cfg-in-file1 }} $SUPP_DIR_B/${{ env.san-suppress-cfg-in-file2 }} \
	$SUPP_DIR_C/${{ env.san-suppress-cfg-in-file1 }} $SUPP_DIR_C/${{ env.san-suppress-cfg-in-file2 }} \
	$SUPP_DIR_OWN/${{ env.san-suppress-cfg-in-file1 }} $SUPP_DIR_OWN/${{ env.san-suppress-cfg-in-file2 }} \
	> ${{ env.san-suppress-cfg-file }} 2> /dev/null; } \|\| true
	${{ env.setup-tests-env }}
	${{ env.setup-run-env }}
	if [ '${{ matrix.build-test-cfg.sanitizer-name }}' != tsan ]; then
	# This is what we want to do normally.
	$RUN_IT > $OUT_DIR/console.log 2>&1
	else # if sanitizer-name is tsan:
	# With TSAN -- which is officially in beta as of even clang-18 (as of this writing we are on 17 at best) --
	# our tests hit some kind of limitation (possibly bug). What happens is the console prints a-la
	# ThreadSanitizer: CHECK failed: sanitizer_deadlock_detector.h:67
	# "((n_all_locks_)) < (((sizeof(all_locks_with_contexts_)/sizeof((all_locks_with_contexts_)[0]))))"
	# (0x40, 0x40) (tid=4111122)
	# and the program hangs indefinitely. This seems to be saying the # of locks reached 64, so TSAN gave up.
	# A ticket has been filed to look into this; but in the meantime we work around it. Namely, we have
	# observed that:
	# - A particular test, even if run by itself, always triggers it. So we are forced to skip that one.
	# - In clang-17 yet another test results in a different problem:
	# LLVM ERROR: Sections with relocations should have an address of 0
	# ...
	# That one is also observed for transport_test exercise mode SHM-jemalloc sub-mode, which as of this
	# writing is skipped for that compiler+TSAN for that reason. We do something similar here in skipping
	# that particular test too in that situation. TODO: It's a test that starts tons of threads.
	# Consider other approaches; maybe reduce number of threads or...? Ticket filed in any case.
	# As for the other tests -- the vast majority -- outside of those 1-2:
	# - A particular small subset of tests, if involved, triggers it. However if run separately from the
	# the others -- even as a group -- then it is OK. So we run all but that group; then just that
	# group.
	LOCK_FATAL_TESTS=Jemalloc_shm_pool_collection_test.Multiprocess
	if [ '${{ matrix.compiler.id }}' = 'clang-17' ]; then
	LOCK_FATAL_TESTS=$LOCK_FATAL_TESTS:Jemalloc_shm_pool_collection_test.Multithread_load
	fi
	LOCK_HEAVY_TESTS='Shm_session_test.External_process_array:\
	Shm_session_test.External_process_vector_offset_ptr:\
	Shm_session_test.External_process_string_offset_ptr:\
	Shm_session_test.External_process_list_offset_ptr:\
	Shm_session_test.Multisession_external_process:\
	Shm_session_test.Disconnected_external_process:\
	Borrower_shm_pool_collection_test.Multiprocess:\
	Shm_pool_collection_test.Multiprocess'
	# Get rid of newlines/backslashes....
	LOCK_HEAVY_TESTS="$(echo "$LOCK_HEAVY_TESTS" \| tr -d '[:space:]\\')"
	if $RUN_IT --gtest_filter=-$LOCK_HEAVY_TESTS:$LOCK_FATAL_TESTS > $OUT_DIR/console.minus-lock-heavy.log 2>&1; \
	then EC_ALL=0; else EC_ALL=$?; fi
	if $RUN_IT --gtest_filter=$LOCK_HEAVY_TESTS > $OUT_DIR/console.lock-heavy.log 2>&1; \
	then EC_LH=0; else EC_LH=$?; fi
	echo "Exit codes: all-minus-lock-heavy = $EC_ALL; lock-heavy = $EC_LH."
	[ $EC_ALL -eq 0 ] && [ $EC_LH -eq 0 ]
	fi

	- name: Prepare run script for [perf_demo] variations below
	if: \|
	!cancelled()
	run: \|
	# Prepare run script for [perf_demo] variations below.
	cat <<'EOF' > ${{ env.install-dir }}/bin/run_perf_demo.sh
	# Script created by pipeline during job.
	echo "Zero-copy backing type: [$1]."
	cd ${{ env.install-dir }}/bin
	OUT_DIR=logs/perf_demo/$1
	mkdir -p $OUT_DIR
	SUPP_DIR_A=${{ github.workspace }}/flow/src
	SUPP_DIR_B=${{ github.workspace }}/ipc_session/src
	SUPP_DIR_C=${{ github.workspace }}/ipc_shm_arena_lend/src
	{ cat $SUPP_DIR_A/${{ env.san-suppress-cfg-in-file1 }} $SUPP_DIR_A/${{ env.san-suppress-cfg-in-file2 }} \
	$SUPP_DIR_B/${{ env.san-suppress-cfg-in-file1 }} $SUPP_DIR_B/${{ env.san-suppress-cfg-in-file2 }} \
	$SUPP_DIR_C/${{ env.san-suppress-cfg-in-file1 }} $SUPP_DIR_C/${{ env.san-suppress-cfg-in-file2 }} \
	> ${{ env.san-suppress-cfg-file }} 2> /dev/null; } \|\| true
	${{ env.setup-tests-env }}
	${{ env.setup-run-env }}
	$BUILT_CMD_PREFIX \
	./perf_demo_srv_$1.exec 1000 $OUT_DIR/srv.log > $OUT_DIR/srv.console.log 2>&1 &
	SRV_PID=$!
	sleep 20 # It fills up a large structure before listening, so give it some time (mostly for slow build types).
	$BUILT_CMD_PREFIX \
	./perf_demo_cli_$1.exec $OUT_DIR/cli.log > $OUT_DIR/cli.console.log 2>&1
	if wait $SRV_PID; then SRV_EC=0; else SRV_EC=$?; fi
	[ $SRV_EC -eq 0 ]
	EOF

	- name: Run integration test [perf_demo - SHM-classic mode]
	if: \|
	!cancelled()
	run: /usr/bin/bash -e ${{ env.install-dir }}/bin/run_perf_demo.sh shm_classic

	- name: Run integration test [perf_demo - SHM-jemalloc mode]
	if: \|
	!cancelled()
	run: /usr/bin/bash -e ${{ env.install-dir }}/bin/run_perf_demo.sh shm_jemalloc

	# For tests below where on failure it can be very helpful to look at higher-verbosity logs,
	# any failing step is repeated with logging hiked up. Note that formally (and practically)
	# higher-than-INFO verbosity is allowed to affect performance and thus is not right for
	# the main integration test run. However on failure all bets are off, and we just want the
	# info we can get. (Also higher-verbosity runs can take significantly longer; no one wants that.)
	#
	# As of this writing unit_test already runs with high verbosity, so we do not re-run on failure
	# like these. The `link_test`s above are very basic tests, essentially there to ensure all built okay
	# and run a sanity-check of a core feature of each of ours libs; so no re-run on failure there either.
	# Lastly perf_demo is about performance and as of this writing happen to lack that knob; so
	# perhaps TODO: Add the verbosity knob and the re-run-on-failure step for that one. It's about perf though,
	# so does not seem like a high priority.

	# This follows the instructions in bin/transport_test/README.txt.
	- name: Prepare run script for [transport_test - Scripted mode] variations below
	if: \|
	!cancelled()
	run: \|
	# Prepare run script for [transport_test - Scripted mode] variations below.
	cat <<'EOF' > ${{ env.install-dir }}/bin/run_transport_test_sc.sh
	echo "Log level: [$1]."
	cd ${{ env.install-dir }}/bin/transport_test
	OUT_DIR_NAME=log_level_$1
	OUT_DIR=../logs/transport_test/scripted/$OUT_DIR_NAME
	mkdir -p $OUT_DIR
	SUPP_DIR_A=${{ github.workspace }}/flow/src
	# In scripted mode ipc_session, while linked, is not invoked in any way; so skip its suppressions.
	{ cat $SUPP_DIR_A/${{ env.san-suppress-cfg-in-file1 }} $SUPP_DIR_A/${{ env.san-suppress-cfg-in-file2 }} \
	> ${{ env.san-suppress-cfg-file }} 2> /dev/null; } \|\| true
	${{ env.setup-tests-env }}
	${{ env.setup-run-env }}
	$BUILT_CMD_PREFIX \
	./transport_test.exec scripted $OUT_DIR/srv.log info $1 \
	< srv-script.txt > $OUT_DIR/srv.console.log 2>&1 &
	SRV_PID=$!
	sleep 1
	$BUILT_CMD_PREFIX \
	./transport_test.exec scripted $OUT_DIR/cli.log info $1 \
	< cli-script.txt > $OUT_DIR/cli.console.log 2>&1 &
	CLI_PID=$!
	if wait $SRV_PID; then SRV_EC=0; else SRV_EC=$?; fi
	echo "Server finished with code [$SRV_EC]."
	if wait $CLI_PID; then CLI_EC=0; else CLI_EC=$?; fi
	echo "Client finished with code [$CLI_EC]."
	[ $SRV_EC -eq 0 ] && [ $CLI_EC -eq 0 ]
	EOF

	- name: Run integration test [transport_test - Scripted mode]
	id: transport_test_scripted
	if: \|
	!cancelled()
	run: /usr/bin/bash -e ${{ env.install-dir }}/bin/run_transport_test_sc.sh info

	- name: Re-run with increased logging, on failure only
	if: \|
	(!cancelled()) && (steps.transport_test_scripted.outcome == 'failure')
	run: /usr/bin/bash -e ${{ env.install-dir }}/bin/run_transport_test_sc.sh data

	# The following [Exercise mode] tests follow the instructions in bin/transport_test/README.txt.
	# Note that the creation of ~/bin/ex_..._run and placement of executables there, plus
	# /tmp/var/run for run-time files (PID files and similar), is a necessary consequence of
	# the ipc::session safety model for estabshing IPC conversations (sessions).

	- name: Prepare IPC-session safety-friendly run-time environment for [transport_test - Exercise mode]
	if: \|
	!cancelled()
	run: \|
	# Prepare IPC-session safety-friendly run-time environment for [transport_test - Exercise mode].
	mkdir -p ~/bin/ex_srv_run ~/bin/ex_cli_run
	mkdir -p /tmp/var/run
	cp -v ${{ env.install-dir }}/bin/transport_test/transport_test.exec \
	~/bin/ex_srv.exec
	cp -v ~/bin/ex_srv.exec ~/bin/ex_cli.exec

	- name: Prepare run script for [transport_test - Exercise mode] variations below
	if: \|
	!cancelled()
	run: \|
	# Prepare run script for [transport_test - Exercise mode] variations below.
	cat <<'EOF' > ${{ env.install-dir }}/bin/run_transport_test_ex.sh
	# Script created by pipeline during job.
	echo "Log level: [$1]."
	echo "Exercise sub-mode: [$2]."
	echo "Sub-mode snippet (none or '-shm-?'): [$3]."
	OUT_DIR=${{ env.install-dir }}/bin/logs/transport_test/exercise/$2
	mkdir -p $OUT_DIR
	SUPP_DIR_A=${{ github.workspace }}/flow/src
	if [ "$3" == '-shm-j' ]; then
	# SHM-jemalloc mode => jemalloc is in fact exercised => suppress libjemalloc stuff.
	# But, nicely, no transport_test-specific suppressions needed as of this writing.
	SUPP_DIR_B=${{ github.workspace }}/ipc_shm_arena_lend/src
	elif [ "$3" == '-shm-c' ]; then
	SUPP_DIR_B=${{ github.workspace }}/test/suite/transport_test/shm-c
	else # if [ "$3" == '' ]; then
	SUPP_DIR_B=${{ github.workspace }}/test/suite/transport_test/heap
	fi
	SUPP_DIR_C=${{ github.workspace }}/ipc_session/src # Session stuff invoked regardless of sub-mode.
	{ cat $SUPP_DIR_A/${{ env.san-suppress-cfg-in-file1 }} $SUPP_DIR_A/${{ env.san-suppress-cfg-in-file2 }} \
	$SUPP_DIR_B/${{ env.san-suppress-cfg-in-file1 }} $SUPP_DIR_B/${{ env.san-suppress-cfg-in-file2 }} \
	$SUPP_DIR_C/${{ env.san-suppress-cfg-in-file1 }} $SUPP_DIR_C/${{ env.san-suppress-cfg-in-file2 }} \
	> ${{ env.san-suppress-cfg-file }} 2> /dev/null; } \|\| true
	${{ env.setup-tests-env }}
	${{ env.setup-run-env }}
	$BUILT_CMD_PREFIX \
	~/bin/ex_srv.exec exercise-srv$3 $OUT_DIR/srv.log info $1 \
	> $OUT_DIR/srv.console.log 2>&1 &
	SRV_PID=$!
	sleep 5
	$BUILT_CMD_PREFIX \
	~/bin/ex_cli.exec exercise-cli$3 $OUT_DIR/cli.log info $1 \
	> $OUT_DIR/cli.console.log 2>&1 &
	CLI_PID=$!
	if wait $SRV_PID; then SRV_EC=0; else SRV_EC=$?; fi
	echo "Server finished with code [$SRV_EC]."
	if wait $CLI_PID; then CLI_EC=0; else CLI_EC=$?; fi
	echo "Client finished with code [$CLI_EC]."
	[ $SRV_EC -eq 0 ] && [ $CLI_EC -eq 0 ]
	EOF

	- name: Run integration test [transport_test - Exercise mode - Heap sub-mode]
	id: transport_test_ex_heap
	if: \|
	!cancelled()
	run: /usr/bin/bash -e ${{ env.install-dir }}/bin/run_transport_test_ex.sh info heap

	- name: Re-run with increased logging, on failure only
	if: \|
	(!cancelled()) && (steps.transport_test_ex_heap.outcome == 'failure')
	run: /usr/bin/bash -e ${{ env.install-dir }}/bin/run_transport_test_ex.sh data heap_log_level_data

	- name: Run integration test [transport_test - Exercise mode - SHM-classic sub-mode]
	id: transport_test_ex_shm_c
	if: \|
	!cancelled()
	run: /usr/bin/bash -e ${{ env.install-dir }}/bin/run_transport_test_ex.sh info shm_classic -shm-c

	- name: Re-run with increased logging, on failure only
	if: \|
	(!cancelled()) && (steps.transport_test_ex_shm_c.outcome == 'failure')
	run: /usr/bin/bash -e ${{ env.install-dir }}/bin/run_transport_test_ex.sh data shm_classic_log_level_data -shm-c

	# Disabling this particular test run for the specific case of clang-17 in TSAN (thread sanitizer) config
	# (in particular at least 2 other clangs+TSAN are exercised, so the TSAN coverage is still good).
	# First the reason in detail: This run semi-reliably (50%+) fails at this point in the server binary:
	# 2023-12-20 11:36:11.322479842 +0000 [info]: Tguy: ex_srv.hpp:send_req_b(1428): App_session [0x7b3800008180]:
	# Chan B[0]: Filling/send()ing payload (description = [reuse out-message + SHM-handle to modified (unless
	# SHM-jemalloc) existing STL data]; alt-payload? = [0]; reusing msg? = [1]; reusing SHM payload? = [1]).
	# LLVM ERROR: Sections with relocations should have an address of 0
	# PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
	# Stack dump:
	# 0. Program arguments: /usr/bin/llvm-symbolizer-17 --demangle --inlines --default-arch=x86_64
	# Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
	# ...
	# ==77990==WARNING: Can't read from symbolizer at fd 599
	# 2023-12-20 11:36:31.592293322 +0000 [info]: Tguy: ex_srv.hpp:send_req_b(1547): App_session [0x7b3800008180]: Chan B[0]: Filling done. Now to send.
	# Sometimes the exact point is different, depending on timing; but in any case it is always the above
	# TSAN/LLVM error, at which point the thread gets stuck for a long time (10+ seconds); but eventually gets
	# unstuck; however transport_test happens to be testing a feature in a certain way so that a giant blocking
	# operation in this thread delays certain processing, causes an internal timeout, and the test exits/fails.
	# Sure, we could make some changes to the test for that to not happen, but that's beside the point: TSAN
	# at run-time is trying to do something and fails terribly; I have no wish to try to work around that situation;
	# literally it says "PLEASE submit a bug report [to clang devs]."
	#
	# TODO: Revisit; figure out how to not trigger this; re-enable. For the record, I (ygoldfel) cannot reproduce
	# in a local clang-17, albeit with libc++ (LLVM STL) instead of libstdc++ (GNU STL). I've also tried to
	# reduce optimization to -O1, as well as with and without LTO, and with and without -fno-omit-frame-pointer;
	# same result.
	- name: Run integration test [transport_test - Exercise mode - SHM-jemalloc sub-mode]
	id: transport_test_ex_shm_j
	if: \|
	(!cancelled()) && ((matrix.compiler.id != 'clang-17') \|\| (matrix.build-test-cfg.sanitizer-name != 'tsan'))
	run: /usr/bin/bash -e ${{ env.install-dir }}/bin/run_transport_test_ex.sh info shm_jemalloc -shm-j

	- name: Re-run with increased logging, on failure only
	if: \|
	(!cancelled()) && (steps.transport_test_ex_shm_j.outcome == 'failure')
	run: /usr/bin/bash -e ${{ env.install-dir }}/bin/run_transport_test_ex.sh data shm_jemalloc_log_level_data -shm-j

	# See earlier comment block about why we saved all the logs including for console-output-only tests/demos.
	- name: Check test/demo logs for non-fatal sanitizer error(s)
	if: \|
	(!cancelled()) && (matrix.build-test-cfg.sanitizer-name == 'ubsan')
	run: \|
	cd ${{ env.install-dir }}/bin/logs
	# grep returns 0 if 1+ found, 1 if none found, 2+ on error. So check results explicitly instead of -e.
	# Namely, for us, the only OK result is an empty stdout and empty stderr.
	# Otherwise either grep failed (unlikely) or found 1+ problems; either way redirection target will
	# be not-empty, and we will force failure.
	{ grep 'SUMMARY: UndefinedBehaviorSanitizer:' `find . -type f` > san_failure_summaries.txt 2>&1; } \|\| true
	if [ -s san_failure_summaries.txt ]; then
	echo 'Error(s) found. Pipeline will fail. Failures summarized below.'
	echo 'Please peruse uploaded log artifacts, resolve the issues, and run pipeline again.'
	echo '[[[ file--'
	cat san_failure_summaries.txt
	echo '--file ]]]'
	false
	fi
	echo 'No errors found in logs.'

	- name: Package test/demo logs tarball
	if: \|
	always()
	run: \|
	# Package test/demo logs tarball.
	cd ${{ env.install-dir }}/bin
	tar cvzf logs.tgz logs
	rm -rf logs # Save runner space.

	- name: Upload test/demo logs (please inspect if failure(s) seen above)
	if: \|
	always()
	uses: actions/upload-artifact@v4
	with:
	name: ipc-test-logs-${{ matrix.compiler.id }}-${{ matrix.build-test-cfg.id }}
	path: ${{ env.install-dir }}/bin/logs.tgz

	# TODO: Look into the topic of debuggability in case of a crash. Is a core generated? Is it saved?
	# Do we need to manually save it as an artifact? For that matter we would then need the binary and
	# ideally the source. For now we save any logs that are not printed to console, and where possible
	# our tests/demos keep it the console exclusively (but in some cases, such as transport_test, it
	# is not practical due to parallel execution and other aspects). In general it is always better that
	# logs are sufficient; but look into situations where they are not.
	#
	# Don't forget situation where program exits due to a sanitizer reporting problem (ASAN, etc.); is
	# there a core? Do we need one? Etc.
	#
	# Possibly this is all handled beautifully automatically; then this should be deleted.

	doc-and-release:
	needs: [setup, set-vars]
	if: \|
	needs.setup.outputs.proceed-else-not == 'true'

	strategy:
	fail-fast: false
	matrix:
	compiler:
	# Pick a reasonably modern but pre-installed compiler for building Doxygen/etc.
	- id: clang-15
	name: clang
	version: 15
	c-path: /usr/bin/clang-15
	cpp-path: /usr/bin/clang++-15
	build-cfg:
	- id: release
	conan-profile-build-type: Release
	conan-preset: release

	runs-on: ubuntu-22.04

	name: doc-${{ matrix.compiler.id }}-${{ matrix.build-cfg.id }}

	steps:
	- name: Update available software list for apt-get
	run: sudo apt-get update

	- name: Install Flow-IPC dependencies (like Graphviz) with apt-get
	run: sudo apt-get install -y graphviz

	- name: Install the latest version of Conan which is less than 2
	run: pip install 'conan<2'

	- name: Checkout `ipc` repository and submodules (like `flow`)
	uses: actions/checkout@v4
	with:
	submodules: true

	# In our process (and this is typical, though it is also possible to create tag without release) we
	# hit Publish on a new Release in GitHub; and this creates both the Release and tag, by convention both named
	# v<something>, at ~the same time (certainly within seconds of each other, empirically speaking).
	# We want a source tarball and/or zip to be attached to the Release. Delightfully, GitHub does this
	# automatically. Less delightfully, we have submodules -- where most of the code is in fact -- which GitHub
	# will not include (they'll just be empty dirs instead). So we create and upload a tarball, etc., manually.
	# (It is not, from what we can tell, possible to then delete the auto-attached "Source code" archives; they
	# are not listable/deletable/uploadable assets in the same way but a built-in GitHub thing. Hopefully there
	# will be no issue.)
	#
	# Regarding the actual upload request (x2): We do it via curl, following the documented GitHub API.
	# Some resources recommend doing this (x2) instead:
	# uses: actions/upload-release-asset@v1.0.2
	# env:
	# GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	# with:
	# upload_url: ${{ steps.prep_release_pkgs.outputs.upload-url }}
	# asset_path: ${{ github.workspace }}/../${{ steps.prep_release_pkgs.outputs.tgz-name }}
	# asset_name: ${{ steps.prep_release_pkgs.outputs.tgz-name }}
	# asset_content_type: application/gzip
	# For me (ygoldfel), despite a few hours of trying this and that and attempting to get debug output, it kept
	# yielding `Invalid name for request` error with no added info. Reasons might be: some silly error on my part
	# (but it is very vanilla, and I reduced it down to the bare essentials with no success, while also eliminating
	# possibilities like it being unable to find the local file to upload and other stupidities); a change in API
	# or some other behavior that was not handled by the upload-release-asset action package; possibly a break
	# in a dependency of upload-release-asset (octokat?). upload-release-asset was last updated in 2020 and is
	# officially now unmaintained. So I fought valiantly but eventually moved onto just using curl which worked
	# almost immediately. Since the resulting code isn't even longer, and we are using a documented public API and
	# standard tool (curl) which we also use elsewhere, it seemed a reasonable approach. TODO: Revisit perhaps.
	- name: (On release creation only) Attach full source package(s) to Release
	if: success() && (!cancelled()) && startsWith(github.ref, 'refs/tags/v')
	run: \|
	# Attach full source package(s) to Release.
	REPO=ipc
	VERSION=`echo ${{ github.ref }} \| cut -c 12-` # E.g., refs/tags/v1.2.3-rc1 => 1.2.3-rc1.
	ARCHIVE_NAME=$REPO-${VERSION}_full
	TGZ_NAME=$ARCHIVE_NAME.tar.gz
	ZIP_NAME=$ARCHIVE_NAME.zip
	cd ..
	pwd
	mv -v $REPO $ARCHIVE_NAME
	# When making archives exclude .git directories and files. (.gitignore and .gitmodules, among others,
	# must stay.) tar --exclude-vcs sounds delightful, but it'll exclude .gitignore and .gitmodules at least;
	# but they are legit code.)
	tar cvzf $TGZ_NAME --exclude=.git $ARCHIVE_NAME
	zip -r $ZIP_NAME $ARCHIVE_NAME --exclude '/.git/' '*/.git'
	mv -v $ARCHIVE_NAME $REPO
	# Soon we will need the upload URL, but unfortunately github.event.release.upload_url is only auto-populated
	# on `release` trigger; whereas we want to be triggerable manually on `push` to tag v* (so a superset
	# of `release` trigger). So we must figure it out via API call. Also, if workflow is invoked a 2nd (etc.)
	# time after succeeding once, then asset might already be attached to Release; then that upload will fail.
	# There is still utility in invoking us manually to, say, signal the web site to re-update; so we do not
	# want to overall-fail in that case. So detect that situation with another API call.
	RELEASE_DATA=`curl -H 'Authorization: token ${{ secrets.GITHUB_TOKEN }}' \
	-H 'Accept: application/vnd.github.v3+json' \
	https://api.github.com/repos/Flow-IPC/$REPO/releases/tags/v$VERSION`
	echo "For release [v$VERSION]: release-data API request yielded: [$RELEASE_DATA]."
	UPLOAD_URL=`echo $RELEASE_DATA \| jq -r .upload_url \| sed 's/{.*}$//'`
	echo "For release [v$VERSION]: upload-URL was computed to be: [$UPLOAD_URL]."
	ASSETS_URL=`echo $RELEASE_DATA \| jq -r .assets_url`
	echo "For release [v$VERSION]: assets-URL was computed to be: [$ASSETS_URL]."
	ASSET_NAMES=`curl -H 'Authorization: token ${{ secrets.GITHUB_TOKEN }}' \
	-H 'Accept: application/vnd.github.v3+json' \
	$ASSETS_URL \
	\| jq -r '.[].name'`
	if echo "$ASSET_NAMES" \| fgrep -xq $TGZ_NAME; then
	echo "Asset named [$TGZ_NAME] is already attached to Release; upload would fail; skipping."
	else
	curl --fail-with-body -X POST \
	-H 'Authorization: token ${{ secrets.GITHUB_TOKEN }}' \
	-H 'Content-Type: application/gzip' -H "Content-Length: $(wc -c < $TGZ_NAME)" \
	--data-binary @$TGZ_NAME "$UPLOAD_URL?name=$TGZ_NAME"
	echo
	echo "Uploaded [$TGZ_NAME] to Release."
	fi
	if echo "$ASSET_NAMES" \| fgrep -xq $ZIP_NAME; then
	echo "Asset named [$ZIP_NAME] is already attached to Release; upload would fail; skipping."
	else
	curl --fail-with-body -X POST \
	-H 'Authorization: token ${{ secrets.GITHUB_TOKEN }}' \
	-H 'Content-Type: application/zip' -H "Content-Length: $(wc -c < $ZIP_NAME)" \
	--data-binary @$ZIP_NAME "$UPLOAD_URL?name=$ZIP_NAME"
	echo
	echo "Uploaded [$ZIP_NAME] to Release."
	fi

	- name: (On release creation only) Signal Pages about release (web site should update)
	if: success() && (!cancelled()) && startsWith(github.ref, 'refs/tags/v')
	# This is pretty similar (not identical) to the main-branch signaling step below. TODO: Code reuse?
	run: \|
	# Signal Pages about release (web site should update).
	curl --fail-with-body -X POST \
	-H 'Accept: application/vnd.github.v3+json' \
	-H 'Authorization: token ${{ secrets.GIT_BOT_PAT }}' \
	'https://api.github.com/repos/Flow-IPC/flow-ipc.github.io/dispatches' \
	-d '{"event_type": "flow-ipc-sync-doc-event", "client_payload": {"version": "${{ github.ref_name }}"}}'

	- name: Create Conan profile
	run: \|
	# Create Conan profile.
	cat <<'EOF' > conan_profile
	[settings]
	compiler = ${{ matrix.compiler.name }}
	compiler.version = ${{ matrix.compiler.version }}
	compiler.cppstd = 17
	compiler.libcxx = libstdc++11
	arch = x86_64
	os = Linux
	build_type = ${{ matrix.build-cfg.conan-profile-build-type }}

	[conf]
	tools.build:compiler_executables = {"c": "${{ matrix.compiler.c-path }}", "cpp": "${{ matrix.compiler.cpp-path }}"}

	[buildenv]
	CC = ${{ matrix.compiler.c-path }}
	CXX = ${{ matrix.compiler.cpp-path }}

	[options]
	ipc:doc = True
	ipc:build = False
	EOF

	- name: Install Flow-IPC dependencies (like Doxygen) with Conan using the profile
	run: conan install . --profile:build conan_profile --profile:host conan_profile --build missing

	- name: Generate code documentation using Conan and Doxygen
	run: conan build .

	- name: Create documentation tarball (full docs, API-only docs, landing page)
	run: \|
	# Create documentation tarball (full docs, API-only docs, landing page).
	cd ${{ github.workspace }}/doc/ipc_doc
	${{ github.workspace }}/tools/doc/stage_generated_docs.sh \
	${{ github.workspace }}/build/${{ matrix.build-cfg.conan-profile-build-type }}

	- name: Upload documentation tarball
	uses: actions/upload-artifact@v4
	with:
	name: ipc-doc
	path: ${{ github.workspace }}/doc/ipc_doc.tgz

	- name: (`main` branch only) Check-in generated documentation directly into source control
	id: doc_check_in
	if: success() && (!cancelled()) && (github.ref == 'refs/heads/main')
	run: \|
	# Check-in generated documentation directly into source control.
	echo 'generated/ docs have been added or replaced locally; mirroring this into checked-in tree.'
	# These values informally recommended in:
	# https://github.com/actions/checkout#push-a-commit-using-the-built-in-token
	git config user.name github-actions
	git config user.email github-actions@github.com
	# We are forced to use a Personal Access Token attached to a special bot user such that in repo Settings
	# we've configured that "guy" as allowed to bypass the requirement to merge via PR. As of this writing
	# there's no way to configure the default token to be able to do this.
	# TODO: Keep an eye on that in case they provide for a better way:
	# https://github.com/orgs/community/discussions/25305
	git config --local http.https://github.com/.extraheader \
	"AUTHORIZATION: basic $(echo -n x-access-token:${{ secrets.GIT_BOT_PAT }} \| base64)"
	cd ${{ github.workspace }}/doc/ipc_doc
	git rm -r --cached generated \|\| echo 'No generated/ currently checked in; no problem.'
	git add generated
	git commit -m '${{ needs.set-vars.outputs.doc-commit-message }}'
	git push origin main

	- name: (`main` branch only) Signal Pages that we have updated the generated docs (web site should update)
	if: success() && (!cancelled()) && (steps.doc_check_in.outcome != 'skipped')
	run: \|
	# Signal Pages that we have updated the generated docs (web site should update).
	curl --fail-with-body -X POST \
	-H 'Accept: application/vnd.github.v3+json' \
	-H 'Authorization: token ${{ secrets.GIT_BOT_PAT }}' \
	'https://api.github.com/repos/Flow-IPC/flow-ipc.github.io/dispatches' \
	-d '{"event_type": "flow-ipc-sync-doc-event"}'

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