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Home/ Questions/Q 8933951
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Editorial Team
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Editorial Team
Asked: June 15, 20262026-06-15T09:40:15+00:00 2026-06-15T09:40:15+00:00

Possible Duplicate: How to include header file through makefile I am using gcc for

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Possible Duplicate:
How to include header file through makefile

I am using gcc for compiling my code. I have a few make files also. Can I tell the compiler to include a particular header file to be automatically included in the all CPP files.

How can I do this?

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  1. Editorial Team
    Editorial Team
    2026-06-15T09:40:16+00:00Added an answer on June 15, 2026 at 9:40 am

    Add the appropriate preprocessor option for gcc to your Makefile-s and have a common_feature_header.h header file defining these.

     # in Makefile
     CPPFLAGS+= -include common_feature_header.h
    

    If you just want to define some preprocessor flags, you don’t need a common_feature_header.h file, but simply add into your Makefile the following definition

     CPPFLAGS+= -DSOME_FEATURE_FLAG=1 -DSOME_OTHERFEATURE_FLAG=0 \
                -DYET_ANOTHER_THING=2
    

    See also this answer.

    P.S. You may want to use remake (notably with its -x option) to debug your Makefile.

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