bfd/warning.m4

   1 dnl Common configure.ac fragment
   2 dnl
   3 dnl   Copyright (C) 2012-2020 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_EGREP_CPP_FOR_BUILD(PATTERN, PROGRAM,
  21 #              [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
  22 # ------------------------------------------------------
  23 AC_DEFUN([AC_EGREP_CPP_FOR_BUILD],
  24 [AC_LANG_PREPROC_REQUIRE()dnl
  25 AC_REQUIRE([AC_PROG_EGREP])dnl
  26 AC_LANG_CONFTEST([AC_LANG_SOURCE([[$2]])])
  27 AS_IF([dnl eval is necessary to expand ac_cpp.
  28 dnl Ultrix and Pyramid sh refuse to redirect output of eval, so use subshell.
  29 (eval "$ac_cpp_for_build conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD |
  30 dnl Quote $1 to prevent m4 from eating character classes
  31   $EGREP "[$1]" >/dev/null 2>&1],
  32   [$3],
  33   [$4])
  34 rm -f conftest*
  35 ])# AC_EGREP_CPP_FOR_BUILD
  36
  37
  38 AC_DEFUN([AM_BINUTILS_WARNINGS],[
  39 # Set the 'development' global.
  40 . $srcdir/../bfd/development.sh
  41
  42 # Set acp_cpp_for_build variable
  43 ac_cpp_for_build="$CC_FOR_BUILD -E $CPPFLAGS_FOR_BUILD"
  44
  45 # Default set of GCC warnings to enable.
  46 GCC_WARN_CFLAGS="-W -Wall -Wstrict-prototypes -Wmissing-prototypes"
  47 GCC_WARN_CFLAGS_FOR_BUILD="-W -Wall -Wstrict-prototypes -Wmissing-prototypes"
  48
  49 # Add -Wshadow if the compiler is a sufficiently recent version of GCC.
  50 AC_EGREP_CPP([(^[0-3]$|^__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__],,GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Wstack-usage=262144")
  54
  55 # Set WARN_WRITE_STRINGS if the compiler supports -Wwrite-strings.
  56 WARN_WRITE_STRINGS=""
  57 AC_EGREP_CPP([(^[0-3]$|^__GNUC__$)],[__GNUC__],,WARN_WRITE_STRINGS="-Wwrite-strings")
  58
  59 # Verify CC_FOR_BUILD to be compatible with warning flags
  60
  61 # Add -Wshadow if the compiler is a sufficiently recent version of GCC.
  62 AC_EGREP_CPP_FOR_BUILD([(^[0-3]$|^__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.
  65 AC_EGREP_CPP_FOR_BUILD([(^[0-4]$|^__GNUC__$)],[__GNUC__],,GCC_WARN_CFLAGS_FOR_BUILD="$GCC_WARN_CFLAGS_FOR_BUILD -Wstack-usage=262144")
  66
  67 AC_ARG_ENABLE(werror,
  68   [  --enable-werror         treat compile warnings as errors],
  69   [case "${enableval}" in
  70      yes | y) ERROR_ON_WARNING="yes" ;;
  71      no | n)  ERROR_ON_WARNING="no" ;;
  72      *) AC_MSG_ERROR(bad value ${enableval} for --enable-werror) ;;
  73    esac])
  74
  75 # Disable -Wformat by default when using gcc on mingw
  76 case "${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   *) ;;
  84 esac
  85
  86 # Enable -Werror by default when using gcc.  Turn it off for releases.
  87 if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" -a "$development" = true ; then
  88     ERROR_ON_WARNING=yes
  89 fi
  90
  91 NO_WERROR=
  92 if test "${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"
  96 fi
  97
  98 if test "${GCC}" = yes ; then
  99   WARN_CFLAGS="${GCC_WARN_CFLAGS}"
 100   WARN_CFLAGS_FOR_BUILD="${GCC_WARN_CFLAGS_FOR_BUILD}"
 101 fi
 102
 103 AC_ARG_ENABLE(build-warnings,
 104 [  --enable-build-warnings enable build-time compiler warnings],
 105 [case "${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 "${enableval}" | sed -e "s/,/ /g"`;;
 120 esac])
 121
 122 if test x"$silent" != x"yes" && test x"$WARN_CFLAGS" != x""; then
 123   echo "Setting warning flags = $WARN_CFLAGS" 6>&1
 124 fi
 125
 126 AC_SUBST(WARN_CFLAGS)
 127 AC_SUBST(WARN_CFLAGS_FOR_BUILD)
 128 AC_SUBST(NO_WERROR)
 129      AC_SUBST(WARN_WRITE_STRINGS)
 130 ])