Makefile.configure

ALLTESTS = open_memstream funopen gc_sections \
	   system-cjson cjson
MAKEFILE := $(lastword $(MAKEFILE_LIST))
OUT :=

PROGRAM-open_memstream = extern int open_memstream(); int main() { return open_memstream(); }
PROGRAM-funopen = extern int funopen(); int main() { return funopen(); }
PROGRAM-gc_sections = int main() {}
CCFLAGS-gc_sections = -Wl,--gc-sections

PROGRAM-cjson  = \#include <stdlib.h>\n
PROGRAM-cjson += \#include <cJSON.h>\n
PROGRAM-cjson += int main() { return cJSON_False; }
CCFLAGS-cjson = -I$(dir $(MAKEFILE))src/cjson
PROGRAM-system-cjson = $(PROGRAM-cjson)
CCLFAGS-system-cjson = -lcJSON

sink:
	@echo >&2 Please run from the top-level Makefile.

configure: $(foreach it,$(ALLTESTS),check-$(it))

check-%:
	@echo $(subst check-,,$@)-tested := 1 $(OUT)
	$(if $(V),,@)if echo -e "$($(subst check-,PROGRAM-,$@))" | \
	    $(CC) -xc $($(subst check-,CCFLAGS-,$@)) -o /dev/null - $(if $(V),,>/dev/null 2>&1); \
	then \
	    echo $(subst check-,,$@)-pass := 1 $(OUT); \
	fi