1dnl Common configure.ac fragment 2dnl 3dnl Copyright (C) 2012-2017 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__],,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__],,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__],,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]$],[__GNUC__],,GCC_WARN_CFLAGS_FOR_BUILD="$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]$],[__GNUC__],,GCC_WARN_CFLAGS_FOR_BUILD="$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