[Bug sanitizer/81981] [8 Regression] -fsanitize=undefined makes a -Wmaybe-uninitialized warning disappear

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81981

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Mon Sep  4 08:11:44 2017
New Revision: 251641

URL: https://gcc.gnu.org/viewcvs?rev=251641&root=gcc&view=rev
Log:
        PR sanitizer/81981
        * gimple-fold.c (gimple_fold_call): Optimize away useless UBSAN_PTR
        and UBSAN_BOUNDS internal calls.  Clean up IFN_UBSAN_OBJECT_SIZE
        handling.  Use replace_call_with_value with NULL instead of
        gsi_replace, unlink_stmt_vdef and release_defs.

        * gcc.dg/ubsan/pr81981.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/ubsan/pr81981.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/gimple-fold.c
    trunk/gcc/testsuite/ChangeLog