1dnl Common configure.ac fragment 2dnl 3dnl Copyright (C) 2012-2024 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. 53#AC_EGREP_CPP([(^[0-4]$|^__GNUC__$)],[__GNUC__],,dnl 54#[AC_EGREP_CPP([^__clang__$],[__clang__],[GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Wstack-usage=262144"],)]) 55 56# Set WARN_WRITE_STRINGS if the compiler supports -Wwrite-strings. 57WARN_WRITE_STRINGS="" 58AC_EGREP_CPP([(^[0-3]$|^__GNUC__$)],[__GNUC__],,WARN_WRITE_STRINGS="-Wwrite-strings") 59 60# Verify CC_FOR_BUILD to be compatible with warning flags 61 62# Add -Wshadow if the compiler is a sufficiently recent version of GCC. 63AC_EGREP_CPP_FOR_BUILD([(^[0-3]$|^__GNUC__$)],[__GNUC__],,GCC_WARN_CFLAGS_FOR_BUILD="$GCC_WARN_CFLAGS_FOR_BUILD -Wshadow") 64 65# Add -Wstack-usage if the compiler is a sufficiently recent version of GCC. 66AC_EGREP_CPP_FOR_BUILD([(^[0-4]$|^__GNUC__$)],[__GNUC__],,dnl 67[AC_EGREP_CPP_FOR_BUILD([^__clang__$],[__clang__],[GCC_WARN_CFLAGS_FOR_BUILD="$GCC_WARN_CFLAGS_FOR_BUILD -Wstack-usage=262144"],)]) 68 69AC_ARG_ENABLE(werror, 70 [ --enable-werror treat compile warnings as errors], 71 [case "${enableval}" in 72 yes | y) ERROR_ON_WARNING="yes" ;; 73 no | n) ERROR_ON_WARNING="no" ;; 74 *) AC_MSG_ERROR(bad value ${enableval} for --enable-werror) ;; 75 esac]) 76 77# Disable -Wformat by default when using gcc on mingw 78case "${host}" in 79 *-*-mingw32*) 80 if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" ; then 81 GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Wno-format" 82 GCC_WARN_CFLAGS_FOR_BUILD="$GCC_WARN_CFLAGS_FOR_BUILD -Wno-format" 83 fi 84 ;; 85 *) ;; 86esac 87 88# Enable -Werror by default when using gcc. Turn it off for releases. 89if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" -a "$development" = true ; then 90 ERROR_ON_WARNING=yes 91fi 92 93NO_WERROR= 94if test "${ERROR_ON_WARNING}" = yes ; then 95 GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Werror" 96 GCC_WARN_CFLAGS_FOR_BUILD="$GCC_WARN_CFLAGS_FOR_BUILD -Werror" 97 NO_WERROR="-Wno-error" 98fi 99 100if test "${GCC}" = yes ; then 101 WARN_CFLAGS="${GCC_WARN_CFLAGS}" 102 WARN_CFLAGS_FOR_BUILD="${GCC_WARN_CFLAGS_FOR_BUILD}" 103fi 104 105AC_ARG_ENABLE(build-warnings, 106[ --enable-build-warnings enable build-time compiler warnings], 107[case "${enableval}" in 108 yes) WARN_CFLAGS="${GCC_WARN_CFLAGS}" 109 WARN_CFLAGS_FOR_BUILD="${GCC_WARN_CFLAGS_FOR_BUILD}";; 110 no) if test "${GCC}" = yes ; then 111 WARN_CFLAGS="-w" 112 WARN_CFLAGS_FOR_BUILD="-w" 113 fi;; 114 ,*) t=`echo "${enableval}" | sed -e "s/,/ /g"` 115 WARN_CFLAGS="${GCC_WARN_CFLAGS} ${t}" 116 WARN_CFLAGS_FOR_BUILD="${GCC_WARN_CFLAGS_FOR_BUILD} ${t}";; 117 *,) t=`echo "${enableval}" | sed -e "s/,/ /g"` 118 WARN_CFLAGS="${t} ${GCC_WARN_CFLAGS}" 119 WARN_CFLAGS_FOR_BUILD="${t} ${GCC_WARN_CFLAGS_FOR_BUILD}";; 120 *) WARN_CFLAGS=`echo "${enableval}" | sed -e "s/,/ /g"` 121 WARN_CFLAGS_FOR_BUILD=`echo "${enableval}" | sed -e "s/,/ /g"`;; 122esac]) 123 124if test x"$silent" != x"yes" && test x"$WARN_CFLAGS" != x""; then 125 echo "Setting warning flags = $WARN_CFLAGS" 6>&1 126fi 127 128AC_SUBST(WARN_CFLAGS) 129AC_SUBST(WARN_CFLAGS_FOR_BUILD) 130AC_SUBST(NO_WERROR) 131 AC_SUBST(WARN_WRITE_STRINGS) 132]) 133