[Bug libstdc++/67114] [MinGW64] build failure with POSIX threads enabled

["sliwa at ifpan dot edu.pl" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67114

--- Comment #9 from Cezary Śliwa <sliwa at ifpan dot edu.pl> ---
One think I missed is that MinGW64 uses the winpthreads library. If using
winpthreads, there is no failure. However, as far as I understand,
pthreads-win32 is in use in MinGW.
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Subject: [Bug tree-optimization/67055] [5/6 Regression] Segmentation fault in fold_builtin_alloca_with_align in tree-ssa-ccp.c
Date: Wed, 05 Aug 2015 10:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idg055

--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Aug  5 10:01:12 2015
New Revision: 226616

URL: https://gcc.gnu.org/viewcvs?rev"6616&root=gcc&view=rev
Log:
2015-08-05  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/67055
        * tree-ssa-ccp.c (fold_builtin_alloca_with_align): Handle
        NULL gimple_block.

        * g++.dg/torture/pr67055.C: New testcase.

Added:
    trunk/gcc/testsuite/g++.dg/torture/pr67055.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-ccp.c