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Editorial Team
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Asked: 2026-05-30T05:24:55+00:00

How do I use different compiler flags for different source files in a Makefile?

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How do I use different compiler flags for different source files in a Makefile? For example, I’d like a Makefile that will produce:

g++ -c -COMPILER_FLAGS_1   -g source1.cpp -o source1.o

g++ -c -COMPILER_FLAGS_2   -g source2.cpp -o source2.o
g++ -c -COMPILER_FLAGS_2   -g source3.cpp -o source3.o
g++ -c -COMPILER_FLAGS_2   -g source4.cpp -o source4.o

g++ -c -COMPILER_FLAGS_3   -g source5.cpp -o source5.o
g++ -c -COMPILER_FLAGS_3   -g source6.cpp -o source6.o
g++ -c -COMPILER_FLAGS_3   -g source7.cpp -o source7.o

g++ -g -o output source1.o source2.o source3.o source4.o source5.o source6.o source7.o

At the moment I’ve got about 20 source files (and that’s expected to grow), so an easy to maintain file would be nice.

Thanks in advance.

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1 Answer

  1. Editorial Team

    You could do something like the following (untested, so the syntax might be slightly off):

    OBJS_1 := source1.o
OBJS_2 := source2.o source3.o source4.o
OBJS_3 := source5.o source6.o source7.o

OBJS := $(OBJS_1) $(OBJS_2) $(OBJS_3)

output: $(OBJS)
    $(CXX) -g -o $@ $^

$(OBJS_1): CXXFLAGS := $(COMPILER_FLAGS_1)
$(OBJS_2): CXXFLAGS := $(COMPILER_FLAGS_2)
$(OBJS_3): CXXFLAGS := $(COMPILER_FLAGS_3)

$(OBJS): %.o: %.cpp
    $(CXX) -c $(CXXFLAGS) -g $< -o $@
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