An attempt to optionally use the compile server in erlc.

[mbj4668]

We use the env var ERLC_USE_SERVER to control the behaviour, since
erlc already uses that variable.

Although this seems to work fine for our project, I am not sure that
it works correctly with files generated from .yrl etc.

[essen]

Yeah it definitely doesn't work for generated files.

[mbj4668]

Yes. I did some more fixes so that things like eunit works, but I think that you probably will do a better (correct) implementation anyway, so I think you can ignore this PR. (That said, it works fine for our needs!)

[essen]

It's tough to get right so any help is appreciated.

[mbj4668]

Ok, I pushed the other changes we did. In our project we have additional generated erl files (which we append to ERL_FILES), and it seems to work.

[essen]

Could you provide the Makefile related to the generated files? Or at least the part directly related to that + where the include erlang.mk line is located with regard to that.

[mbj4668]

Sure, here's the relevant snippet of the Makefile.

ERLC_USE_SERVER = true
export ERLC_USE_SERVER

EUNIT_OPTS = verbose,{print_depth,9999},{report,{eunit_surefire,[{dir,"."}]}}

include $(TOP_DIR)/mk/erlang.mk

ebin/$(PROJECT).app:: $(wildcard $(PROJECT_ENV_FILE))

# there is no variable LOCAL_BUILD_DEPS in erlang.mk, so we fake it here
ALL_DEPS_DIRS += $(addprefix $(LIB_DIR)/, $(LOCAL_BUILD_DEPS))

# ensure we have correct include path
ERLC_OPTS += -I $(LIB_DIR)
TEST_ERLC_OPTS += -I $(LIB_DIR)

# we allow export of variables from if/case
ERLC_OPTS := $(filter-out +warn_export_vars,$(ERLC_OPTS))
TEST_ERLC_OPTS := $(filter-out +warn_export_vars,$(TEST_ERLC_OPTS))

## add targets for yang compilation

YANG_FILES = $(filter %.yang,$(ALL_SRC_FILES))
YANG_ERL_FILES = $(patsubst src/%.yang, src/yy-%.erl, $(YANG_FILES))
ERL_FILES += $(YANG_ERL_FILES)
YANG_BEAM_FILES = $(patsubst src/%.yang, ebin/yy-%.beam, $(YANG_FILES))

app:: $(YANG_BEAM_FILES)

YANGER_OPTS ?=

YANGER_YY_DIR = $(LIB_DIR)/yanger_yy/ebin
YY_SRC = $(LIB_DIR)/yy/src
YY_DIR = $(LIB_DIR)/yy/ebin
SYST_SRC = $(LIB_DIR)/syst/src

yang_verbose_0 = @echo " YANGER " $(filter %.yang,$<);
yang_verbose_2 = set -x;
yang_verbose = $(yang_verbose_$(V))

src/yy-%.erl: src/%.yang ../yy/include/yy.hrl $(YANGER_YY_DIR)/yanger_yy.beam
	$(yang_verbose) $(YANGER) -Werror -P $(YANGER_YY_DIR) --pz $(YY_DIR) \
	-p $(SYST_SRC) -p $(YY_SRC) -f yy $(YANGER_OPTS) -o $@ $<

## if we have yang files we need yanger
ifneq ($(strip $(YANG_FILES)),)
LOCAL_BUILD_DEPS += yanger_yy
endif

[essen]

Thanks! I'll take a look when time allows. Plan is to do this and package changes together as they're both breaking or potentially breaking changes.

[mbj4668]

Ok. +1 to the package changes as well!