sim/m4/sim_ac_option_warnings.m4

   1 dnl Copyright (C) 1997-2023 Free Software Foundation, Inc.
   2 dnl
   3 dnl This program is free software; you can redistribute it and/or modify
   4 dnl it under the terms of the GNU General Public License as published by
   5 dnl the Free Software Foundation; either version 3 of the License, or
   6 dnl (at your option) any later version.
   7 dnl
   8 dnl This program is distributed in the hope that it will be useful,
   9 dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 dnl GNU General Public License for more details.
  12 dnl
  13 dnl You should have received a copy of the GNU General Public License
  14 dnl along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15 dnl
  16 dnl --enable-build-warnings is for developers of the simulator.
  17 dnl it enables extra GCC specific warnings.
  18 AC_DEFUN([SIM_AC_OPTION_WARNINGS],
  19 [
  20 AC_ARG_ENABLE(werror,
  21   AS_HELP_STRING([--enable-werror], [treat compile warnings as errors]),
  22   [case "${enableval}" in
  23      yes | y) ERROR_ON_WARNING="yes" ;;
  24      no | n)  ERROR_ON_WARNING="no" ;;
  25      *) AC_MSG_ERROR(bad value ${enableval} for --enable-werror) ;;
  26    esac])
  27
  28 dnl Enable -Werror by default when using gcc
  29 if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" ; then
  30   ERROR_ON_WARNING=yes
  31 fi
  32
  33 WERROR_CFLAGS=""
  34 if test "${ERROR_ON_WARNING}" = yes ; then
  35   WERROR_CFLAGS="-Werror"
  36 fi
  37
  38 dnl The options we'll try to enable.
  39 dnl NB: Kept somewhat in sync with gdbsupport/warnings.m4.
  40 build_warnings="-Wall -Wdeclaration-after-statement -Wpointer-arith
  41 -Wno-unused -Wunused-value -Wunused-function
  42 -Wno-switch -Wno-char-subscripts
  43 -Wempty-body -Wunused-but-set-parameter
  44 -Wno-error=maybe-uninitialized
  45 -Wmissing-declarations
  46 -Wmissing-prototypes
  47 -Wdeclaration-after-statement -Wmissing-parameter-type
  48 -Wpointer-sign
  49 -Wold-style-declaration -Wold-style-definition
  50 "
  51
  52 # Enable -Wno-format by default when using gcc on mingw since many
  53 # GCC versions complain about %I64.
  54 case "${host}" in
  55   *-*-mingw32*) build_warnings="$build_warnings -Wno-format" ;;
  56   *) build_warnings="$build_warnings -Wformat-nonliteral" ;;
  57 esac
  58
  59 AC_ARG_ENABLE(build-warnings,
  60 AS_HELP_STRING([--enable-build-warnings], [enable build-time compiler warnings if gcc is used]),
  61 [case "${enableval}" in
  62   yes)  ;;
  63   no)   build_warnings="-w";;
  64   ,*)   t=`echo "${enableval}" | sed -e "s/,/ /g"`
  65         build_warnings="${build_warnings} ${t}";;
  66   *,)   t=`echo "${enableval}" | sed -e "s/,/ /g"`
  67         build_warnings="${t} ${build_warnings}";;
  68   *)    build_warnings=`echo "${enableval}" | sed -e "s/,/ /g"`;;
  69 esac
  70 if test x"$silent" != x"yes" && test x"$build_warnings" != x""; then
  71   echo "Setting compiler warning flags = $build_warnings" 6>&1
  72 fi])dnl
  73 AC_ARG_ENABLE(sim-build-warnings,
  74 AS_HELP_STRING([--enable-sim-build-warnings], [enable SIM specific build-time compiler warnings if gcc is used]),
  75 [case "${enableval}" in
  76   yes)  ;;
  77   no)   build_warnings="-w";;
  78   ,*)   t=`echo "${enableval}" | sed -e "s/,/ /g"`
  79         build_warnings="${build_warnings} ${t}";;
  80   *,)   t=`echo "${enableval}" | sed -e "s/,/ /g"`
  81         build_warnings="${t} ${build_warnings}";;
  82   *)    build_warnings=`echo "${enableval}" | sed -e "s/,/ /g"`;;
  83 esac
  84 if test x"$silent" != x"yes" && test x"$build_warnings" != x""; then
  85   echo "Setting GDB specific compiler warning flags = $build_warnings" 6>&1
  86 fi])dnl
  87 WARN_CFLAGS=""
  88 if test "x${build_warnings}" != x -a "x$GCC" = xyes
  89 then
  90     AC_MSG_CHECKING(compiler warning flags)
  91     # Separate out the -Werror flag as some files just cannot be
  92     # compiled with it enabled.
  93     for w in ${build_warnings}; do
  94         case $w in
  95         -Werr*) WERROR_CFLAGS=-Werror ;;
  96         *) # Check that GCC accepts it
  97             saved_CFLAGS="$CFLAGS"
  98             CFLAGS="$CFLAGS -Werror $w"
  99             AC_TRY_COMPILE([],[],WARN_CFLAGS="${WARN_CFLAGS} $w",)
 100             CFLAGS="$saved_CFLAGS"
 101         esac
 102     done
 103     AC_MSG_RESULT(${WARN_CFLAGS} ${WERROR_CFLAGS})
 104 fi
 105 ])
 106 AC_SUBST(WARN_CFLAGS)
 107 AC_SUBST(WERROR_CFLAGS)