bfd/warning.m4

   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="$GCC_WARN_CFLAGS -Wstack-usage=262144")
  32
  33
  34 AC_ARG_ENABLE(werror,
  35   [  --enable-werror         treat compile warnings as errors],
  36   [case "${enableval}" in
  37      yes | y) ERROR_ON_WARNING="yes" ;;
  38      no | n)  ERROR_ON_WARNING="no" ;;
  39      *) AC_MSG_ERROR(bad value ${enableval} for --enable-werror) ;;
  40    esac])
  41
  42 # Disable -Wformat by default when using gcc on mingw
  43 case "${host}" in
  44   *-*-mingw32*)
  45     if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" ; then
  46       GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Wno-format"
  47     fi
  48     ;;
  49   *) ;;
  50 esac
  51
  52 # Enable -Werror by default when using gcc.  Turn it off for releases.
  53 if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" -a "$development" = true ; then
  54     ERROR_ON_WARNING=yes
  55 fi
  56
  57 NO_WERROR=
  58 if test "${ERROR_ON_WARNING}" = yes ; then
  59     GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Werror"
  60     NO_WERROR="-Wno-error"
  61 fi
  62
  63 if test "${GCC}" = yes ; then
  64   WARN_CFLAGS="${GCC_WARN_CFLAGS}"
  65 fi
  66
  67 AC_ARG_ENABLE(build-warnings,
  68 [  --enable-build-warnings enable build-time compiler warnings],
  69 [case "${enableval}" in
  70   yes)  WARN_CFLAGS="${GCC_WARN_CFLAGS}";;
  71   no)   if test "${GCC}" = yes ; then
  72           WARN_CFLAGS="-w"
  73         fi;;
  74   ,*)   t=`echo "${enableval}" | sed -e "s/,/ /g"`
  75         WARN_CFLAGS="${GCC_WARN_CFLAGS} ${t}";;
  76   *,)   t=`echo "${enableval}" | sed -e "s/,/ /g"`
  77         WARN_CFLAGS="${t} ${GCC_WARN_CFLAGS}";;
  78   *)    WARN_CFLAGS=`echo "${enableval}" | sed -e "s/,/ /g"`;;
  79 esac])
  80
  81 if test x"$silent" != x"yes" && test x"$WARN_CFLAGS" != x""; then
  82   echo "Setting warning flags = $WARN_CFLAGS" 6>&1
  83 fi
  84
  85 AC_SUBST(WARN_CFLAGS)
  86 AC_SUBST(NO_WERROR)
  87 ])