[Bug sanitizer/81111] [8 Regression] Cannot build libstdc++ with -fsanitize=undefined

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81111

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Jun 21 22:17:49 2017
New Revision: 249480

URL: https://gcc.gnu.org/viewcvs?rev=249480&root=gcc&view=rev
Log:
        Backported from mainline
        2017-06-20  Jakub Jelinek  <jakub@redhat.com>

        PR sanitizer/81125
        * ubsan.h (ubsan_encode_value): Workaround buggy clang++ parser
        by removing enum keyword.
        (ubsan_type_descriptor): Likewise.  Formatting fix.

        2017-06-19  Jakub Jelinek  <jakub@redhat.com>

        PR sanitizer/81125
        * ubsan.h (enum ubsan_encode_value_phase): New.
        (ubsan_encode_value): Change second argument to
        enum ubsan_encode_value_phase with default value of
        UBSAN_ENCODE_VALUE_GENERIC.
        * ubsan.c (ubsan_encode_value): Change second argument to
        enum ubsan_encode_value_phase PHASE from bool IN_EXPAND_P,
        adjust uses, for UBSAN_ENCODE_VALUE_GENERIC use just
        create_tmp_var_raw instead of create_tmp_var and use a
        TARGET_EXPR.
        (ubsan_expand_bounds_ifn, ubsan_build_overflow_builtin,
        instrument_bool_enum_load, ubsan_instrument_float_cast): Adjust
        ubsan_encode_value callers.

        PR sanitizer/81111
        * ubsan.c (ubsan_encode_value): If current_function_decl is NULL,
        use create_tmp_var_raw instead of create_tmp_var, mark it addressable
        just by setting TREE_ADDRESSABLE on the result and use a TARGET_EXPR.

        PR sanitizer/81125
        * g++.dg/ubsan/pr81125.C: New test.

        PR sanitizer/81111
        * g++.dg/ubsan/pr81111.C: New test.

Added:
    branches/gcc-7-branch/gcc/testsuite/g++.dg/ubsan/pr81111.C
    branches/gcc-7-branch/gcc/testsuite/g++.dg/ubsan/pr81125.C
Modified:
    branches/gcc-7-branch/gcc/ChangeLog
    branches/gcc-7-branch/gcc/testsuite/ChangeLog
    branches/gcc-7-branch/gcc/ubsan.c
    branches/gcc-7-branch/gcc/ubsan.h