[Bug malloc/21120] glibc malloc is incompatible with GCC 7

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=21120

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4e61a6be446026c327aa70cef221c9082bf0085d

commit 4e61a6be446026c327aa70cef221c9082bf0085d
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Fri Jun 30 09:11:08 2017 -0700

    i386: Increase MALLOC_ALIGNMENT to 16 [BZ #21120]

    GCC 7 changed the definition of max_align_t on i386:

   
https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=9b5c49ef97e63cc63f1ffa13baf771368105ebe2

    As a result, glibc malloc no longer returns memory blocks which are as
    aligned as max_align_t requires.

    This causes malloc/tst-malloc-thread-fail to fail with an error like this
    one:

    error: allocation function 0, size 144 not aligned to 16

    This patch moves the MALLOC_ALIGNMENT definition to <malloc-alignment.h>
    and increases the malloc alignment to 16 for i386.

        [BZ #21120]
        * malloc/malloc-internal.h (MALLOC_ALIGNMENT): Moved to ...
        * sysdeps/generic/malloc-alignment.h: Here.  New file.
        * sysdeps/i386/malloc-alignment.h: Likewise.
        * sysdeps/generic/malloc-machine.h: Include <malloc-alignment.h>.

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

Summary of changes:
 ChangeLog                                          |    8 ++++++++
 malloc/malloc-internal.h                           |   10 ----------
 .../generic/malloc-alignment.h                     |   19 +++++++++++--------
 sysdeps/generic/malloc-machine.h                   |    1 +
 .../locale_t.h => sysdeps/i386/malloc-alignment.h  |   12 +++++-------
 5 files changed, 25 insertions(+), 25 deletions(-)
 copy bits/uio-ext.h => sysdeps/generic/malloc-alignment.h (55%)
 copy locale/bits/types/locale_t.h => sysdeps/i386/malloc-alignment.h (80%)

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