[Bug tree-optimization/42944] [4.5 Regression] errno misoptimization due to __attribute__ ((__const__)) on __errno_location()

[rguenth at gcc dot gnu dot org]

------- Comment #4 from rguenth at gcc dot gnu dot org  2010-02-03 13:03 -------
Subject: Bug 42944

Author: rguenth
Date: Wed Feb  3 13:03:39 2010
New Revision: 156467

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=156467
Log:
2010-02-03  Richard Guenther  <rguent...@suse.de>

        PR tree-optimization/42944
        * tree-ssa-alias.c (ref_maybe_used_by_call_p_1): Handle
        calloc.
        (call_may_clobber_ref_p_1): Likewise.  Properly handle
        malloc and calloc clobbering errno.

        * gcc.dg/errno-1.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/errno-1.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-alias.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42944