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aprell/override.mk

Last active November 4, 2021 15:51
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Overriding Makefile variables
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override.mk
test1: CFLAGS ?= -Wall -Wextra
test2: CFLAGS += -Wall -Wextra
test3: override CFLAGS += -Wall -Wextra
test4: override CFLAGS := -Wall -Wextra $(CFLAGS)
test1 test2 test3 test4:
@echo "$@: $(CFLAGS)"
.PHONY: test1 test2 test3 test4
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aprell commented Nov 4, 2021 

$ for test in test{1,2,3,4}; do make -f override.mk $test; done
test1: -Wall -Wextra
test2: -Wall -Wextra
test3: -Wall -Wextra
test4: -Wall -Wextra

$ for test in test{1,2,3,4}; do make CFLAGS="-g" -f override.mk $test; done
test1: -g
test2: -g
test3: -g -Wall -Wextra
test4: -Wall -Wextra -g

$ for test in test{1,2,3,4}; do CFLAGS="-g" make -f override.mk $test; done
test1: -g
test2: -g -Wall -Wextra
test3: -g -Wall -Wextra
test4: -Wall -Wextra -g

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