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Home/ Questions/Q 6854051
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Editorial Team
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Editorial Team
Asked: May 27, 20262026-05-27T01:35:09+00:00 2026-05-27T01:35:09+00:00

Is there a way to loop through all the included/defined header files and then

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Is there a way to loop through all the included/defined header files and then #undef them all?

If looping is the issue, is there another way to #undef all of them with ease?

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  1. Editorial Team
    Editorial Team
    2026-05-27T01:35:09+00:00Added an answer on May 27, 2026 at 1:35 am

    GNU cpp provides a -dM directive to do exactly that, you can list all the defines:

    gcc -E -dM -c foo.c

    You can then use a sed script to undef them on command line 🙂

    gcc -E -c foo.c | sed ‘s/#define/#undef/’

    or do whatever…

    have fun 🙂

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