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

  1. #1
    Registered User
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    May 2015
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    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) $@.c -o $@ $(SYNCTHREAD)
    else
    $(TARGET): 
        $(GCC) $(CFLAGS) $@.c -o $@
    endif
    
    .PHONY: clean
    
    clean:
        rm -f $(TARGET)
    Last edited by deathslice; 10-05-2016 at 12:17 PM.

  2. #2
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    May 2015
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    228
    oops, can a moderator change the title of this thread to "How to execute specific targets based on a gcc flag(-D) in the Makefile". Don't know what happen there.

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