[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=c8cadd861e1720be10e49324ddb058fe0a54d5c5

commit c8cadd861e1720be10e49324ddb058fe0a54d5c5
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Thu Jun 29 10:26:04 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 increases the malloc alignment to 16 for i386.

        [BZ #21120]
        * sysdeps/generic/malloc-alignment.h: New file.
        * sysdeps/i386/malloc-alignment.h: Likewise.
        * sysdeps/generic/malloc-machine.h: Include <malloc-alignment.h>.

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