[Bug bootstrap/103459] Make configury regenerate cleanly with `autoreconf -Wall`

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103459

--- Comment #26 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Pietro Monteiro <pie...@gcc.gnu.org>:

https://gcc.gnu.org/g:a44acda568b6740ca2396205ec1db3514bc0325c

commit r17-6082-ga44acda568b6740ca2396205ec1db3514bc0325c
Author: Pietro Monteiro <pie...@sociotechnical.xyz>
Date:   Mon Nov 9 21:47:56 2026 -0500

    configury: Stop using AC_CANONICAL_SYSTEM [PR103459]

    libstdc++ configure.ac has a reference to a mailinglist post[0]
    explaining why AC_CANONICAL_SYSTEM and
    target_alias=${target_alias-$host_alias} are used.

    The main reason to use AC_CANONICAL_SYSTEM is an automake bug that has
    been fixed in the version currently used (1.15.1).  In the version of
    autoconf we use (2.69) AC_CANONICAL_SYSTEM is aliased to
    AC_CANONICAL_TARGET, so the only change caused by using
    AC_CANONICAL_TARGET is the removal of an empty line and the
    re-adjustment of #line comments on autoconf tests because of that.

    The libstc++ message and two lines have been copied to other
    libraries.  But the copy paste has mutated, sometimes separating the
    two lines, sometimes adding a redundant AC_SUBST(target_alias), and in
    one case adding AC_CANONICAL_HOST.

    Update all libs AC_CANONICAL_SYSTEM to AC_CANONICAL_TARGET.  Remove
    redundant AC_CANONICAL_HOST (AC_REQUIRE'd by AC_CANONICAL_TARGET).  And
    remove redundant AC_SUBST(target_alias), which is done by
    AC_CANONICAL_TARGET.

    To avoid confusion remove all the mentions to the libstdc++ message, but
    leave other comments untouched if they exist.

    [0] http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html

            PR bootstrap/103459

    gotools/ChangeLog:

            * configure.ac: Update comment to reference
            AC_CANONICAL_TARGET instead of AC_CANONICAL_SYSTEM.

    libatomic/ChangeLog:

            * configure: Regenerate.
            * configure.ac: Use AC_CANONICAL_TARGET instead of
            AC_CANONICAL_SYSTEM.

    libga68/ChangeLog:

            * configure: Regenerate.
            * configure.ac: Use AC_CANONICAL_TARGET instead of
            AC_CANONICAL_SYSTEM.  Remove unneeded AC_CANONICAL_HOST.
            Remove unneeded AC_SUBST(target_alias).

    libgcobol/ChangeLog:

            * configure: Regenerate.
            * configure.ac: Use AC_CANONICAL_TARGET instead of
            AC_CANONICAL_SYSTEM.  Remove unneeded AC_SUBST(target_alias).

    libgfortran/ChangeLog:

            * configure: Regenerate.
            * configure.ac: Use AC_CANONICAL_TARGET instead of
            AC_CANONICAL_SYSTEM.  Remove unneeded AC_SUBST(target_alias).

    libgm2/ChangeLog:

            * configure: Regenerate.
            * configure.ac: Use AC_CANONICAL_TARGET instead of
            AC_CANONICAL_SYSTEM.  Remove unneeded AC_SUBST(target_alias).

    libgomp/ChangeLog:

            * configure: Regenerate.
            * configure.ac: Use AC_CANONICAL_TARGET instead of
            AC_CANONICAL_SYSTEM.

    libgrust/ChangeLog:

            * configure: Regenerate.
            * configure.ac: Use AC_CANONICAL_TARGET instead of
            AC_CANONICAL_SYSTEM.  Remove unneeded AC_SUBST(target_alias).

    libitm/ChangeLog:

            * configure: Regenerate.
            * configure.ac: Use AC_CANONICAL_TARGET instead of
            AC_CANONICAL_SYSTEM.

    libphobos/ChangeLog:

            * configure: Regenerate.
            * configure.ac: Remove unneeded AC_SUBST(target_alias).

    libquadmath/ChangeLog:

            * configure: Regenerate.
            * configure.ac: Use AC_CANONICAL_TARGET instead of
            AC_CANONICAL_SYSTEM.  Remove unneeded AC_SUBST(target_alias).

    libsanitizer/ChangeLog:

            * configure: Regenerate.
            * configure.ac: Use AC_CANONICAL_TARGET instead of
            AC_CANONICAL_SYSTEM.  Remove unneeded AC_SUBST(target_alias).

    libssp/ChangeLog:

            * configure: Regenerate.
            * configure.ac: Use AC_CANONICAL_TARGET instead of
            AC_CANONICAL_SYSTEM.  Remove unneeded AC_SUBST(target_alias).

    libstdc++-v3/ChangeLog:

            * configure: Regenerate.
            * configure.ac: Use AC_CANONICAL_TARGET instead of
            AC_CANONICAL_SYSTEM.

    libvtv/ChangeLog:

            * configure: Regenerate.
            * configure.ac: Use AC_CANONICAL_TARGET instead of
            AC_CANONICAL_SYSTEM.  Remove unneeded AC_SUBST(target_alias).

    Signed-off-by: Pietro Monteiro <pie...@sociotechnical.xyz>