Having trouble building from source...

[rod-chapman]

I am having trouble finding a consistent set of sources to build from.
I am working on an x86_64 machine running Ubutu 24.04LTS.

I build LLVM 16.0.6 from scratch.

BUT... can anyone post here the exact Git commits that are needed for the 3 repo's
gcc
llvm
gnat-llvm
please?

Also, exactly which set of patches do I need to apply before building LLVM?
Thanks,
Rod

[nerdtype]

Hi Rod,

I can't really help you with your specific questions but I thought I would share the notes I've gathered in my (failed) attempts to build GNAT-LLVM.

Notes:

I am using a debian based Linux derivative and followed the "Building" procedure in the GNAT LLVM readme at: https://github.com/AdaCore/gnat-llvm

Before building llvm, I applied the 'LLVMCreateTargetMachineWithABI.diff' patch.
To build llvm 16.0.x , I needed to install llvm and clang (through system packages) before running "make llvm". After building llvm, I uninstalled the llvm and clang packages and setup my PATH to point to the llvm 16.0.x binaries.

From this point I should just have to run "make" to build GNAT LLVM, but this command fails. See my post here for details: #48

The comment from Arnaud suggests that there is potentially a mismatch between the GNAT LLVM sources and the GCC sources. I checked out branch 25.1 (gnat-llvm) and master (gcc) and wrote a script to rebuild the gnat-llvm project for each gcc commit (starting from master and going back in time one commit per iteration) and stop when the build is successful, but I have not been able to find a gcc commit that builds with gnat-llvm 25.1 and I've built the first 1,000 commits from master.

N

[ArnaudCharlet]

Rod, see Issue #49 which gives answers to your questions