gdb/sanitize.m4

   1 dnl Sanitization-related configure macro for GDB
   2 dnl Copyright (C) 2018-2020 Free Software Foundation, Inc.
   3 dnl
   4 dnl This file is part of GDB.
   5 dnl
   6 dnl This program is free software; you can redistribute it and/or modify
   7 dnl it under the terms of the GNU General Public License as published by
   8 dnl the Free Software Foundation; either version 3 of the License, or
   9 dnl (at your option) any later version.
  10 dnl
  11 dnl This program is distributed in the hope that it will be useful,
  12 dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 dnl GNU General Public License for more details.
  15 dnl
  16 dnl You should have received a copy of the GNU General Public License
  17 dnl along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 AC_DEFUN([AM_GDB_UBSAN],[
  20 AC_ARG_ENABLE(ubsan,
  21   AS_HELP_STRING([--enable-ubsan],
  22                  [enable undefined behavior sanitizer (auto/yes/no)]),
  23   [],enable_ubsan=no)
  24 if test "x$enable_ubsan" = xauto; then
  25   if $development; then
  26     enable_ubsan=yes
  27   fi
  28 fi
  29 AC_LANG_PUSH([C++])
  30 if test "x$enable_ubsan" = xyes; then
  31   AC_MSG_CHECKING(whether -fsanitize=undefined is accepted)
  32   saved_CXXFLAGS="$CXXFLAGS"
  33   CXXFLAGS="$CXXFLAGS -fsanitize=undefined -fno-sanitize-recover=undefined"
  34   dnl A link check is required because it is possible to install gcc
  35   dnl without libubsan, leading to link failures when compiling with
  36   dnl -fsanitize=undefined.
  37   AC_TRY_LINK([],[],enable_ubsan=yes,enable_ubsan=no)
  38   CXXFLAGS="$saved_CXXFLAGS"
  39   AC_MSG_RESULT($enable_ubsan)
  40   if test "x$enable_ubsan" = xyes; then
  41     WARN_CFLAGS="$WARN_CFLAGS -fsanitize=undefined -fno-sanitize-recover=undefined"
  42     CONFIG_LDFLAGS="$CONFIG_LDFLAGS -fsanitize=undefined"
  43   fi
  44 fi
  45 AC_LANG_POP([C++])
  46 ])