Created
July 9, 2024 12:48
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Experimenting with compiler introspection in GNU Make
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| .PHONY: default gnu23 gnu23.mk | |
| default:| gnu23; $(info $(CC) -std=$(gnu23)) | |
| gnu23:| gnu23.mk; $(eval include gnu23.mk) | |
| gnu23.mk: gnu23.h; @$(CC) -E -xc -P $< >$@ | |
| gnu23.h: $(lastword $(MAKEFILE_LIST)); $(call cstd,$@) @: | |
| override cstd =$(file >$1,$(.cstd)) | |
| override .cstd =$(call \ | |
| P,#ifdef __clang_major__) $(call \ | |
| L,#if __clang_major__ > 17) $(call \ | |
| L,override gnu23 := gnu23) $(call \ | |
| L,#elif __clang_major__ > 8) $(call \ | |
| L,override gnu23 := gnu2x) $(call \ | |
| L,#endif) $(call \ | |
| L,#elif __GNUC__ > 13) $(call \ | |
| L,override gnu23 := gnu23) $(call \ | |
| L,#elif __GNUC__ > 8) $(call \ | |
| L,override gnu23 := gnu2x) $(call \ | |
| L,#endif) | |
| override P = $(call .P,$(value 1)) | |
| override .P = $(value 1) | |
| override L = $(call .L,$(value 1)) | |
| override .L = $n$(value 1) | |
| override define n:= | |
| endef |
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