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Rebuild if any of the CFLAGS changed #57

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16 changes: 15 additions & 1 deletion Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -56,6 +56,19 @@ ifdef OPENMP
CFLAGS += -fopenmp
endif

# aggregation of all cflags
FLAGS = AVX_CFLAGS=$(AVX_CFLAGS)\
AVX2_CFLAGS=$(AVX2_CFLAGS)\
SSSE3_CFLAGS=$(SSSE3_CFLAGS)\
SSE41_CFLAGS=$(SSE41_CFLAGS)\
SSE42_CFLAGS=$(SSE42_CFLAGS)\
NEON32_CFLAGS=$(NEON32_CFLAGS)\
NEON64_CFLAGS=$(NEON64_CFLAGS)\
OPENMP=$(OPENMP)

# update the cache file only if FLAGS changed
FLAGS_CACHE = .flags.cache
RES := $(shell if [ ! -f $(FLAGS_CACHE) ] || [ "`cat $(FLAGS_CACHE)`" != "$(FLAGS)" ] ; then echo "$(FLAGS)" > $(FLAGS_CACHE) ; fi )

.PHONY: all analyze clean

Expand All @@ -68,7 +81,8 @@ lib/libbase64.o: $(OBJS)
$(LD) -r -o $@ $^
$(OBJCOPY) --keep-global-symbols=lib/exports.txt $@

lib/config.h:
lib/config.h: $(FLAGS_CACHE)
@echo "Generating $@"
@echo "#define HAVE_AVX2 $(HAVE_AVX2)" > $@
@echo "#define HAVE_NEON32 $(HAVE_NEON32)" >> $@
@echo "#define HAVE_NEON64 $(HAVE_NEON64)" >> $@
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