Thread: How to execute specific targets based on a gcc flag(-D) in the Makefile

So my goal as of now is to be able to compile my program under a flag(-D) if and only the user does make -D. If the user simply does make, then compile the program without the -D flag. The problem with this is that the macro MAKEFLAGS does not have the -D flag defined anywhere in it because this is a gcc preprocessor flag. So what can I do?

Here is how my Makefile looks

Code:

TARGET = ThreadSync

GCC = gcc

CFLAGS = -Wall -Wextra -g -std=gnu99 -pthread

SYNCTHREAD = -D PTHREAD_SYNC 

all: $(TARGET)

ifneq (,$(findstring D,$(MAKEFLAGS)))
$(TARGET): 
    $(GCC) $(CFLAGS) [email protected] -o $@ $(SYNCTHREAD)
else
$(TARGET): 
    $(GCC) $(CFLAGS) [email protected] -o $@
endif

.PHONY: clean

clean:
    rm -f $(TARGET)