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


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

            Bug ID: 21120
           Summary: glibc malloc is incompatible with GCC 7
           Product: glibc
           Version: 2.25
            Status: NEW
          Severity: normal
          Priority: P2
         Component: malloc
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
  Target Milestone: ---
            Target: i386
             Flags: security-

GCC 7 changes 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

We should increase the malloc alignment to 16, or ask GCC to revert the change.

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