CC=gcc
CFLAGS=-O2 
LDFLAGS=-lm -lgmp -lz

HAVE_CC=$(shell $(CC) --version ; echo \$?)

IS_CC_GCC=$(shell $(CC) --version | grep -Eic 'gcc' || echo "NUL")
IS_CC_CLANG=$(shell $(CC) --version | grep -Eic '(llvm|clang)' || echo "NUL") 
IS_CC_ICC=$(shell $(CC) --version | grep -Eic 'Intel' || echo "NUL")


ifneq ($(IS_CC_GCC),"NUL")
# compiler is GCC
	CFLAGS+=-fopenmp
else
    ifneq ($(IS_CC_CGLANG), "NUL")
# compiler is CLANG
	LDFLAGS+=-lomp
    else 
         ifneq ($(IS_CC_ICC), "NUL")
# compiler is Intel icc
		CFLAGS+=-qopenmp
         endif
    endif
endif


all: reducibility_complexity

clean:
	rm -f reducibility_complexity

reducibility: reducibility_complexity.c
	$(CC) $(CFLAGS) $(LDFLAGS)  reducibility_complexity.c  -o  reducibility_complexity