1 dnl Common configure.ac fragment 2 dnl 3 dnl Copyright (C) 2012-2016 Free Software Foundation, Inc. 4 dnl 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. 9 dnl 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. 14 dnl 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/>. 18 dnl 19 20 AC_DEFUN([AM_BINUTILS_WARNINGS],[ 21 # Set the 'development' global. 22 . $srcdir/../bfd/development.sh 23 24 # Default set of GCC warnings to enable. 25 GCC_WARN_CFLAGS="-W -Wall -Wstrict-prototypes -Wmissing-prototypes" 26 27 # Add -Wshadow if the compiler is a sufficiently recent version of GCC. 28 AC_EGREP_CPP([^[0-3]$],[__GNUC__],,GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Wshadow") 29 30 # Add -Wstack-usage if the compiler is a sufficiently recent version of GCC. 31 AC_EGREP_CPP([^[0-4]$],[__GNUC__],,GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Wstack-usage=262144") 32 33 # Set WARN_WRITE_STRINGS if the compiler supports -Wwrite-strings. 34 WARN_WRITE_STRINGS="" 35 AC_EGREP_CPP([^[0-3]$],[__GNUC__],,WARN_WRITE_STRINGS="-Wwrite-strings") 36 37 AC_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 ${enableval} for --enable-werror) ;; 43 esac]) 44 45 # Disable -Wformat by default when using gcc on mingw 46 case "${host}" in 47 *-*-mingw32*) 48 if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" ; then 49 GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Wno-format" 50 fi 51 ;; 52 *) ;; 53 esac 54 55 # Enable -Werror by default when using gcc. Turn it off for releases. 56 if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" -a "$development" = true ; then 57 ERROR_ON_WARNING=yes 58 fi 59 60 NO_WERROR= 61 if test "${ERROR_ON_WARNING}" = yes ; then 62 GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Werror" 63 NO_WERROR="-Wno-error" 64 fi 65 66 if test "${GCC}" = yes ; then 67 WARN_CFLAGS="${GCC_WARN_CFLAGS}" 68 fi 69 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 "${GCC}" = yes ; then 75 WARN_CFLAGS="-w" 76 fi;; 77 ,*) t=`echo "${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"`;; 82 esac]) 83 84 if test x"$silent" != x"yes" && test x"$WARN_CFLAGS" != x""; then 85 echo "Setting warning flags = $WARN_CFLAGS" 6>&1 86 fi 87 88 AC_SUBST(WARN_CFLAGS) 89 AC_SUBST(NO_WERROR) 90 AC_SUBST(WARN_WRITE_STRINGS) 91 ]) 92
