janware/jw-pkg
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Code Activity

Further improve build time: Try to avoid calling projects.py

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This commit tries to remove the necessity to call projects.py from $(TOPDIR) to
speed up recursive builds over all projects yet again. This is a major
undertaking. There are two variables which are filled py projects.py in
$(TOPDIR): PREREQ and PREREQ_DIRS. Sadly, the latter is a path relative to
$(TOPDIR)/make, so this is kind of pointless. Unless the cache is maintained in
$(TOPDIR), a thing I tried to avoid. So this commit is only able to cache
$(PREREQ), not $(PREREQ_DIRS), which still is a hassle. Introduced defs-dirs.mk
for that, to make it accessible to make.mk, and modified all the other parts of
the machinery, too.

Signed-off-by: Jan Lindemann <jan@janware.com>
This commit is contained in:
Jan Lindemann 2019-02-28 14:48:57 +00:00
commit 3dd55cf067
5 changed files with 49 additions and 30 deletions
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6
make/cache.mk
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@ -1,13 +1,15 @@
# ----- define these variables
# CACHED_FILES = $(TOPDIR)/VERSION
# CACHED_VARS = VERSION
.PHONY: cache
CACHE_FILE_MK ?= .cache.mk
# if not checked against MAKECMDGOALS, a standard rule kicks in from rules.mk,
# and $(CACHE_FILE_MK) is remade with the clean target
ifeq ($(findstring clean,$(MAKECMDGOALS)),)
all: $(CACHE_FILE_MK)
all: cache
ifneq ($(foreach g,all cache,$(findstring $(g),$(MAKECMDGOALS))),)
cache: $(CACHE_FILE_MK)
$(CACHE_FILE_MK): $(CACHED_FILES) $(MODDIR)/make/cache.mk
ifeq ($(wildcard $(CACHE_FILE_MK)),)
@echo $(foreach v,$(CACHED_VARS),$v := $(value $(v))EOL) | $(SED) 's/EOL */\n/g;' | $(GREP) . | tee $@.tmp