Jan Lindemann
262be57741
Check with ifndef if a variable is defined before hard defining it in cache.mk. This gives more flexibility when overriding variables with local.mk.
Signed-off-by: Jan Lindemann <jan@janware.com>
30 lines
843 B
Makefile
30 lines
843 B
Makefile
# ----- define these variables
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# CACHED_FILES = $(TOPDIR)/VERSION
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# CACHED_VARS = VERSION
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.PHONY: cache clean-cache clean-cache-projects
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CACHE_PROJECT_MK ?= .cache-project.mk
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CACHED_VARS_ONLY_PROJECT ?= \
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PROJECT \
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PREREQ \
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VERSION \
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HEX_VERSION \
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FULL_NAME \
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JW_PKG_LD_LIBRARY_PATH \
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JW_PKG_EXE_PATH \
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JW_PKG_PYTHON_PATH
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all: cache
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clean: clean-cache
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clean-cache:
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rm -f $(CACHE_PROJECT_MK)
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cache: $(CACHE_PROJECT_MK)
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$(CACHE_PROJECT_MK): $(CACHED_FILES) $(JWBDIR)/make/cache.mk
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@echo $(foreach v,$(CACHED_VARS),$v = $(value $(v)) EOL) | \
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$(SED) 's/\s\+EOL/\n/g;' | \
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$(SED) 's/\s*\(\S\+\)\s*=\s*\(.*\)\s*/ifndef \1\n \1 = \2\nendif\n/g;' | \
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$(SED) 's|$(realpath $(TOPDIR))|$$(TOPDIR)|g' | \
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$(SED) 's|$(realpath $(PROJECTS_DIR))|$$(PROJECTS_DIR)|g' | \
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$(GREP) . | \
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tee $@.tmp
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mv $@.tmp $@
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