1dnl Common configure.ac fragment
2dnl
3dnl   Copyright (C) 2012-2021 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
20# AC_EGREP_CPP_FOR_BUILD(PATTERN, PROGRAM,
21#              [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
22# ------------------------------------------------------
23AC_DEFUN([AC_EGREP_CPP_FOR_BUILD],
24[AC_LANG_PREPROC_REQUIRE()dnl
25AC_REQUIRE([AC_PROG_EGREP])dnl
26AC_LANG_CONFTEST([AC_LANG_SOURCE([[$2]])])
27AS_IF([dnl eval is necessary to expand ac_cpp.
28dnl Ultrix and Pyramid sh refuse to redirect output of eval, so use subshell.
29(eval "$ac_cpp_for_build conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD |
30dnl Quote $1 to prevent m4 from eating character classes
31  $EGREP "[$1]" >/dev/null 2>&1],
32  [$3],
33  [$4])
34rm -f conftest*
35])# AC_EGREP_CPP_FOR_BUILD
36
37
38AC_DEFUN([AM_BINUTILS_WARNINGS],[
39# Set the 'development' global.
40. $srcdir/../bfd/development.sh
41
42# Set acp_cpp_for_build variable
43ac_cpp_for_build="$CC_FOR_BUILD -E $CPPFLAGS_FOR_BUILD"
44
45# Default set of GCC warnings to enable.
46GCC_WARN_CFLAGS="-W -Wall -Wstrict-prototypes -Wmissing-prototypes"
47GCC_WARN_CFLAGS_FOR_BUILD="-W -Wall -Wstrict-prototypes -Wmissing-prototypes"
48
49# Add -Wshadow if the compiler is a sufficiently recent version of GCC.
50AC_EGREP_CPP([(^[0-3]$|^__GNUC__$)],[__GNUC__],,GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Wshadow")
51
52# Add -Wstack-usage if the compiler is a sufficiently recent version of GCC.
53AC_EGREP_CPP([(^[0-4]$|^__GNUC__$)],[__GNUC__],,GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Wstack-usage=262144")
54
55# Set WARN_WRITE_STRINGS if the compiler supports -Wwrite-strings.
56WARN_WRITE_STRINGS=""
57AC_EGREP_CPP([(^[0-3]$|^__GNUC__$)],[__GNUC__],,WARN_WRITE_STRINGS="-Wwrite-strings")
58
59# Verify CC_FOR_BUILD to be compatible with warning flags
60
61# Add -Wshadow if the compiler is a sufficiently recent version of GCC.
62AC_EGREP_CPP_FOR_BUILD([(^[0-3]$|^__GNUC__$)],[__GNUC__],,GCC_WARN_CFLAGS_FOR_BUILD="$GCC_WARN_CFLAGS_FOR_BUILD -Wshadow")
63
64# Add -Wstack-usage if the compiler is a sufficiently recent version of GCC.
65AC_EGREP_CPP_FOR_BUILD([(^[0-4]$|^__GNUC__$)],[__GNUC__],,GCC_WARN_CFLAGS_FOR_BUILD="$GCC_WARN_CFLAGS_FOR_BUILD -Wstack-usage=262144")
66
67AC_ARG_ENABLE(werror,
68  [  --enable-werror         treat compile warnings as errors],
69  [case "${enableval}" in
70     yes | y) ERROR_ON_WARNING="yes" ;;
71     no | n)  ERROR_ON_WARNING="no" ;;
72     *) AC_MSG_ERROR(bad value ${enableval} for --enable-werror) ;;
73   esac])
74
75# Disable -Wformat by default when using gcc on mingw
76case "${host}" in
77  *-*-mingw32*)
78    if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" ; then
79      GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Wno-format"
80      GCC_WARN_CFLAGS_FOR_BUILD="$GCC_WARN_CFLAGS_FOR_BUILD -Wno-format"
81    fi
82    ;;
83  *) ;;
84esac
85
86# Enable -Werror by default when using gcc.  Turn it off for releases.
87if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" -a "$development" = true ; then
88    ERROR_ON_WARNING=yes
89fi
90
91NO_WERROR=
92if test "${ERROR_ON_WARNING}" = yes ; then
93    GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Werror"
94    GCC_WARN_CFLAGS_FOR_BUILD="$GCC_WARN_CFLAGS_FOR_BUILD -Werror"
95    NO_WERROR="-Wno-error"
96fi
97
98if test "${GCC}" = yes ; then
99  WARN_CFLAGS="${GCC_WARN_CFLAGS}"
100  WARN_CFLAGS_FOR_BUILD="${GCC_WARN_CFLAGS_FOR_BUILD}"
101fi
102
103AC_ARG_ENABLE(build-warnings,
104[  --enable-build-warnings enable build-time compiler warnings],
105[case "${enableval}" in
106  yes)	WARN_CFLAGS="${GCC_WARN_CFLAGS}"
107        WARN_CFLAGS_FOR_BUILD="${GCC_WARN_CFLAGS_FOR_BUILD}";;
108  no)	if test "${GCC}" = yes ; then
109	  WARN_CFLAGS="-w"
110      WARN_CFLAGS_FOR_BUILD="-w"
111	fi;;
112  ,*)   t=`echo "${enableval}" | sed -e "s/,/ /g"`
113        WARN_CFLAGS="${GCC_WARN_CFLAGS} ${t}"
114        WARN_CFLAGS_FOR_BUILD="${GCC_WARN_CFLAGS_FOR_BUILD} ${t}";;
115  *,)   t=`echo "${enableval}" | sed -e "s/,/ /g"`
116        WARN_CFLAGS="${t} ${GCC_WARN_CFLAGS}"
117        WARN_CFLAGS_FOR_BUILD="${t} ${GCC_WARN_CFLAGS_FOR_BUILD}";;
118  *)    WARN_CFLAGS=`echo "${enableval}" | sed -e "s/,/ /g"`
119        WARN_CFLAGS_FOR_BUILD=`echo "${enableval}" | sed -e "s/,/ /g"`;;
120esac])
121
122if test x"$silent" != x"yes" && test x"$WARN_CFLAGS" != x""; then
123  echo "Setting warning flags = $WARN_CFLAGS" 6>&1
124fi
125
126AC_SUBST(WARN_CFLAGS)
127AC_SUBST(WARN_CFLAGS_FOR_BUILD)
128AC_SUBST(NO_WERROR)
129     AC_SUBST(WARN_WRITE_STRINGS)
130])
131