janware/jw-pkg
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jw-pkg/make/cache.mk

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make: Further improve build time This commit sees several improvements to the build performance: - Introduce cache.mk, which creates makefiles caching often used variables, per tree and per project. - Define more variables with := enclosed in condistions, instead of defining them with ?=, because the RHS of ?= is expanded deferredly. - Add more definitions for executables. - Move some more specialized definitions out into specialized makefiles, notably htdocs.mk and tmpl.mk Signed-off-by: Jan Lindemann <jan@janware.com>
2019-02-28 13:22:12 +00:00
# ----- define these variables
# CACHED_FILES = $(TOPDIR)/VERSION
# CACHED_VARS = VERSION
Further improve build time: Try to avoid calling projects.py 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>
2019-02-28 14:48:57 +00:00
.PHONY: cache
make: Further improve build time This commit sees several improvements to the build performance: - Introduce cache.mk, which creates makefiles caching often used variables, per tree and per project. - Define more variables with := enclosed in condistions, instead of defining them with ?=, because the RHS of ?= is expanded deferredly. - Add more definitions for executables. - Move some more specialized definitions out into specialized makefiles, notably htdocs.mk and tmpl.mk Signed-off-by: Jan Lindemann <jan@janware.com>
2019-02-28 13:22:12 +00:00
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
Further improve build time: Try to avoid calling projects.py 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 $(PREREQ_DIRS), which still is a hassle. Introduced defs-dirs.mk for that, to make it accessible to make.mk, and modified all the other parts of the machinery, too. Signed-off-by: Jan Lindemann <jan@janware.com>
2019-02-28 14:48:57 +00:00
all: cache
ifneq ($(foreach g,all cache,$(findstring $(g),$(MAKECMDGOALS))),)
cache: $(CACHE_FILE_MK)
Everywhere: Rename MODDIR -> JWBDIR Rename the omnipresent MODDIR variable to JWBDIR, since that's more to the point. Signed-off-by: Jan Lindemann <jan@janware.com>
2019-06-29 21:34:18 +00:00
$(CACHE_FILE_MK): $(CACHED_FILES) $(JWBDIR)/make/cache.mk
make: Further improve build time This commit sees several improvements to the build performance: - Introduce cache.mk, which creates makefiles caching often used variables, per tree and per project. - Define more variables with := enclosed in condistions, instead of defining them with ?=, because the RHS of ?= is expanded deferredly. - Add more definitions for executables. - Move some more specialized definitions out into specialized makefiles, notably htdocs.mk and tmpl.mk Signed-off-by: Jan Lindemann <jan@janware.com>
2019-02-28 13:22:12 +00:00
ifeq ($(wildcard $(CACHE_FILE_MK)),)
@echo $(foreach v,$(CACHED_VARS),$v := $(value $(v))EOL) | $(SED) 's/EOL */\n/g;' | $(GREP) . | tee $@.tmp
mv $@.tmp $@
else
rm $@
make $@
endif
endif
clean: clean-cache
clean-cache:
$(RM) -f $(CACHE_FILE_MK)
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