[Bug sanitizer/81275] [6/7/8 Regression] -fsanitize=thread produce incorrect -Wreturn-type warning

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81275

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Dec  1 08:11:56 2017
New Revision: 255296

URL: https://gcc.gnu.org/viewcvs?rev=255296&root=gcc&view=rev
Log:
        PR sanitizer/81275
        * tree-cfg.c (group_case_labels_stmt): Don't optimize away
        C++ FE implicitly added __builtin_unreachable () until -Wreturn-type
        is diagnosed.

        * c-c++-common/tsan/pr81275.c: Remove dg-skip-if.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/c-c++-common/tsan/pr81275.c
    trunk/gcc/tree-cfg.c