1 dnl Common configure.ac fragment
3 dnl Copyright (C) 2012-2016 Free Software Foundation, Inc.
5 dnl This file is free software; you can redistribute it and/or modify
6 dnl it under the terms of the GNU General Public License as published by
7 dnl the Free Software Foundation; either version 3 of the License, or
8 dnl (at your option) any later version.
10 dnl This program is distributed in the hope that it will be useful,
11 dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
12 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 dnl GNU General Public License for more details.
15 dnl You should have received a copy of the GNU General Public License
16 dnl along with this program; see the file COPYING3. If not see
17 dnl <http://www.gnu.org/licenses/>.
20 AC_DEFUN([AM_BINUTILS_WARNINGS],[
21 # Set the 'development' global.
22 . $srcdir/../bfd/development.sh
24 # Default set of GCC warnings to enable.
25 GCC_WARN_CFLAGS="-W -Wall -Wstrict-prototypes -Wmissing-prototypes"
27 # Add -Wshadow if the compiler is a sufficiently recent version of GCC.
28 AC_EGREP_CPP([^[0-3]$],[__GNUC__],,GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Wshadow")
30 # Add -Wstack-usage if the compiler is a sufficiently recent version of GCC.
31 AC_EGREP_CPP([^[0-4]$],[__GNUC__],,GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Wstack-usage=262144")
33 # Set WARN_WRITE_STRINGS if the compiler supports -Wwrite-strings.
35 AC_EGREP_CPP([^[0-3]$],[__GNUC__],,WARN_WRITE_STRINGS="-Wwrite-strings")
38 [ --enable-werror treat compile warnings as errors],
39 [case "${enableval}" in
40 yes | y) ERROR_ON_WARNING="yes" ;;
41 no | n) ERROR_ON_WARNING="no" ;;
42 *) AC_MSG_ERROR(bad value ${enableval} for --enable-werror) ;;
45 # Disable -Wformat by default when using gcc on mingw
48 if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" ; then
49 GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Wno-format"
55 # Enable -Werror by default when using gcc. Turn it off for releases.
56 if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" -a "$development" = true ; then
61 if test "${ERROR_ON_WARNING}" = yes ; then
62 GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Werror"
63 NO_WERROR="-Wno-error"
66 if test "${GCC}" = yes ; then
67 WARN_CFLAGS="${GCC_WARN_CFLAGS}"
70 AC_ARG_ENABLE(build-warnings,
71 [ --enable-build-warnings enable build-time compiler warnings],
72 [case "${enableval}" in
73 yes) WARN_CFLAGS="${GCC_WARN_CFLAGS}";;
74 no) if test "${GCC}" = yes ; then
77 ,*) t=`echo "${enableval}" | sed -e "s/,/ /g"`
78 WARN_CFLAGS="${GCC_WARN_CFLAGS} ${t}";;
79 *,) t=`echo "${enableval}" | sed -e "s/,/ /g"`
80 WARN_CFLAGS="${t} ${GCC_WARN_CFLAGS}";;
81 *) WARN_CFLAGS=`echo "${enableval}" | sed -e "s/,/ /g"`;;
84 if test x"$silent" != x"yes" && test x"$WARN_CFLAGS" != x""; then
85 echo "Setting warning flags = $WARN_CFLAGS" 6>&1
90 AC_SUBST(WARN_WRITE_STRINGS)