1dnl Common configure.ac fragment
2dnl
3dnl   Copyright (C) 2012-2016 Free Software Foundation, Inc.
4dnl
5dnl This file is free software; you can redistribute it and/or modify
6dnl it under the terms of the GNU General Public License as published by
7dnl the Free Software Foundation; either version 3 of the License, or
8dnl (at your option) any later version.
9dnl
10dnl This program is distributed in the hope that it will be useful,
11dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
12dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13dnl GNU General Public License for more details.
14dnl
15dnl You should have received a copy of the GNU General Public License
16dnl along with this program; see the file COPYING3.  If not see
17dnl <http://www.gnu.org/licenses/>.
18dnl
19
20AC_DEFUN([AM_BINUTILS_WARNINGS],[
21# Set the 'development' global.
22. $srcdir/../bfd/development.sh
23
24# Default set of GCC warnings to enable.
25GCC_WARN_CFLAGS="-W -Wall -Wstrict-prototypes -Wmissing-prototypes"
26
27# Add -Wshadow if the compiler is a sufficiently recent version of GCC.
28AC_EGREP_CPP([^[0-3]$],[__GNUC__],,GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Wshadow")
29
30# Add -Wstack-usage if the compiler is a sufficiently recent version of GCC.
31AC_EGREP_CPP([^[0-4]$],[__GNUC__],,GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Wstack-usage=262144")
32
33# Set WARN_WRITE_STRINGS if the compiler supports -Wwrite-strings.
34WARN_WRITE_STRINGS=""
35AC_EGREP_CPP([^[0-3]$],[__GNUC__],,WARN_WRITE_STRINGS="-Wwrite-strings")
36
37AC_ARG_ENABLE(werror,
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 ${enableval} for --enable-werror) ;;
43   esac])
44
45# Disable -Wformat by default when using gcc on mingw
46case "${host}" in
47  *-*-mingw32*)
48    if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" ; then
49      GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Wno-format"
50    fi
51    ;;
52  *) ;;
53esac
54
55# Enable -Werror by default when using gcc.  Turn it off for releases.
56if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" -a "$development" = true ; then
57    ERROR_ON_WARNING=yes
58fi
59
60NO_WERROR=
61if test "${ERROR_ON_WARNING}" = yes ; then
62    GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Werror"
63    NO_WERROR="-Wno-error"
64fi
65
66if test "${GCC}" = yes ; then
67  WARN_CFLAGS="${GCC_WARN_CFLAGS}"
68fi
69
70AC_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 "${GCC}" = yes ; then
75	  WARN_CFLAGS="-w"
76	fi;;
77  ,*)   t=`echo "${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"`;;
82esac])
83
84if test x"$silent" != x"yes" && test x"$WARN_CFLAGS" != x""; then
85  echo "Setting warning flags = $WARN_CFLAGS" 6>&1
86fi
87
88AC_SUBST(WARN_CFLAGS)
89AC_SUBST(NO_WERROR)
90     AC_SUBST(WARN_WRITE_STRINGS)
91])
92