[Bug bootstrap/112422] Build process does a redundant number of checks ?

Fri, 09 Oct 2026 11:42:52 -0700 

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112422

--- Comment #7 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Sam James <[email protected]>:

https://gcc.gnu.org/g:a98718d58c8498a092a530166b1aaa43b8410a58

commit r17-5037-ga98718d58c8498a092a530166b1aaa43b8410a58
Author: Sam James <[email protected]>
Date:   Tue Jun 9 23:14:09 2026 +0100

    Drop AC_HEADER_STDC

    AC_HEADER_STDC checks for C89/C90 headers. We should be able to assume
    at least that for building GCC.

    Not only that, autoconf 2.70 drops this and makes it a stub.

    fixincludes/ChangeLog:
            PR bootstrap/112422

            * configure: Regenerate.
            * configure.ac: Drop AC_HEADER_STDC.

    gcc/ChangeLog:
            PR bootstrap/112422

            * configure: Regenerate.
            * configure.ac: AC_HEADER_STDC.

    gcc/m2/ChangeLog:
            PR bootstrap/112422

            * gm2-libs/config-host.in: Drop AC_HEADER_STDC.

    libcpp/ChangeLog:
            PR bootstrap/112422

            * configure: Regenerate.
            * configure.ac: Drop AC_HEADER_STDC.

    libdecnumber/ChangeLog:

            * configure: Regenerate.
            * configure.ac: Drop AC_HEADER_STDC.

    libgcc/ChangeLog:
            PR bootstrap/112422

            * config.in (STDC_HEADERS): Delete.
            * configure: Regenerate.
            * configure.ac: Drop AC_HEADER_STDC.

    libgm2/ChangeLog:
            PR bootstrap/112422

            * configure: Regenerate.
            * configure.ac: Drop AC_HEADER_STDC.

    libgrust/ChangeLog:
            PR bootstrap/112422

            * configure: Regenerate.
            * configure.ac: Drop AC_HEADER_STDC.

    libobjc/ChangeLog:
            PR bootstrap/112422

            * configure: Regenerate.
            * configure.ac: Drop AC_HEADER_STDC.

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