[Bug tree-optimization/85259] [8/9 Regression] Missing -Wstringop-overflow= since r256683

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85259

--- Comment #6 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Tue Jun 12 18:05:13 2018
New Revision: 261518

URL: https://gcc.gnu.org/viewcvs?rev=261518&root=gcc&view=rev
Log:
PR tree-optimization/85259 - Missing -Wstringop-overflow= since r256683

gcc/ChangeLog:

        PR tree-optimization/85259
        * builtins.c (compute_objsize): Handle constant offsets.
        * gimple-ssa-warn-restrict.c (maybe_diag_offset_bounds): Return
        true iff a warning has been issued.
        * gimple.h (gimple_nonartificial_location): New function.
        * tree-ssa-strlen.c (maybe_diag_stxncpy_trunc): Call
        gimple_nonartificial_location and handle -Wno-system-headers.
        (handle_builtin_stxncpy): Same.

gcc/testsuite/ChangeLog:

        PR tree-optimization/85259
        * gcc.dg/Wstringop-overflow-5.c: New test.
        * gcc.dg/Wstringop-overflow-6.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/Wstringop-overflow-5.c
    trunk/gcc/testsuite/gcc.dg/Wstringop-overflow-6.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/builtins.c
    trunk/gcc/gimple-ssa-warn-restrict.c
    trunk/gcc/gimple.h
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-strlen.c