[Bug middle-end/59125] [4.8 Regression] gcc triggers wrong strncpy_chk

["rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59125

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Jan  9 15:25:34 2014
New Revision: 206467

URL: http://gcc.gnu.org/viewcvs?rev=206467&root=gcc&view=rev
Log:
2014-01-09  Richard Biener  <rguenther@suse.de>

    Backport from mainline
    2013-11-18  Richard Biener  <rguenther@suse.de>

    PR tree-optimization/59125
    PR tree-optimization/54570
    * tree-ssa-sccvn.c (copy_reference_ops_from_ref): When inlining
    is not complete do not treat component-references with offset zero
    but different fields as equal.
    * tree-object-size.c: Include tree-phinodes.h and ssa-iterators.h.
    (compute_object_sizes): Apply TLC.  Propagate the constant
    results into all uses and fold their stmts.
    * passes.def (pass_all_optimizations): Move pass_object_sizes
    after the first pass_forwprop and before pass_fre.

    * gcc.dg/builtin-object-size-8.c: Un-xfail.
    * gcc.dg/builtin-object-size-14.c: New testcase.
    * gcc.dg/strlenopt-14gf.c: Adjust.
    * gcc.dg/strlenopt-1f.c: Likewise.
    * gcc.dg/strlenopt-4gf.c: Likewise.

    2013-12-03  Jakub Jelinek  <jakub@redhat.com>

    PR tree-optimization/59362
    * tree-object-size.c (object_sizes): Change into array of
    vec<unsigned HOST_WIDE_INT>.
    (compute_builtin_object_size): Check computed bitmap for
    non-NULL instead of object_sizes.  Call safe_grow on object_sizes
    vector if new SSA_NAMEs appeared.
    (init_object_sizes): Check computed bitmap for non-NULL.
    Call safe_grow on object_sizes elements instead of initializing
    it with XNEWVEC.
    (fini_object_sizes): Call release on object_sizes elements, don't
    set it to NULL.

    * gcc.c-torture/compile/pr59362.c: New test.

Added:
    branches/gcc-4_8-branch/gcc/testsuite/gcc.c-torture/compile/pr59362.c
    branches/gcc-4_8-branch/gcc/testsuite/gcc.dg/builtin-object-size-14.c
Modified:
    branches/gcc-4_8-branch/gcc/ChangeLog
    branches/gcc-4_8-branch/gcc/passes.c
    branches/gcc-4_8-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_8-branch/gcc/testsuite/gcc.dg/builtin-object-size-8.c
    branches/gcc-4_8-branch/gcc/testsuite/gcc.dg/strlenopt-14gf.c
    branches/gcc-4_8-branch/gcc/testsuite/gcc.dg/strlenopt-1f.c
    branches/gcc-4_8-branch/gcc/testsuite/gcc.dg/strlenopt-4gf.c
    branches/gcc-4_8-branch/gcc/tree-object-size.c
    branches/gcc-4_8-branch/gcc/tree-ssa-sccvn.c