[Bug libc/23993] glibc 2.29 doesn't build with gcc 4.9

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=23993

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=192963be49678b48f60218f1f794991cdd9fe472

commit 192963be49678b48f60218f1f794991cdd9fe472
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Fri Dec 21 17:53:40 2018 +0000

    Require GCC 5 or later to build glibc (bug 23993).

    We know that building glibc with GCC 4.9 is broken on various
    platforms (bug 23993).  As it's more than a year since we last
    increased the minimum GCC version to build glibc, this patch changes
    the requirement to be GCC 5 or later (indeed, based on 4.9 having been
    required for building 2.26, it would be consistent in terms of timing
    to require GCC 6 or later from the 2.30 release onwards).  It
    deliberately just updates the configure test and corresponding
    documentation, leaving removal of no-longer-needed __GNUC_PREREQ tests
    for a separate patch.

    In the NEWS entry, the requirement for a newer GCC version for
    powerpc64le is reiterated (as in the entry for the 4.9 requirement in
    2.26) to avoid suggesting the version requirement there has gone down.
    (If that version goes up further as part of support for binary128 long
    double, of course the wording would change at that time.)

    Tested for x86_64.

        [BZ #23993]
        * configure.ac (libc_cv_compiler_ok): Require GCC 5 or later.
        * configure: Regenerated.
        * manual/install.texi (Tools for Compilation): Update minimum GCC
        version.
        * INSTALL: Regenerated.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog           |    9 +++++++++
 INSTALL             |    4 ++--
 NEWS                |    6 ++++++
 configure           |    2 +-
 configure.ac        |    2 +-
 manual/install.texi |    4 ++--
 6 files changed, 21 insertions(+), 6 deletions(-)

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