sim/m4/sim_ac_option_warnings.m4

   1 dnl   Copyright (C) 1997-2021 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 dnl arg[1] Enable -Werror by default? ("yes" or "no")
  19 AC_DEFUN([SIM_AC_OPTION_WARNINGS],
  20 [
  21 AC_ARG_ENABLE(werror,
  22   AS_HELP_STRING([--enable-werror], [treat compile warnings as errors]),
  23   [case "${enableval}" in
  24      yes | y) ERROR_ON_WARNING="yes" ;;
  25      no | n)  ERROR_ON_WARNING="no" ;;
  26      *) AC_MSG_ERROR(bad value ${enableval} for --enable-werror) ;;
  27    esac])
  28
  29 # Enable -Werror by default when using gcc
  30 if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" ; then
  31     ERROR_ON_WARNING=yes
  32 fi
  33
  34 WERROR_CFLAGS=""
  35 m4_if(m4_default([$1], [yes]), [yes], [dnl
  36   if test "${ERROR_ON_WARNING}" = yes ; then
  37     WERROR_CFLAGS="-Werror"
  38   fi
  39 ])dnl
  40
  41 build_warnings="-Wall -Wdeclaration-after-statement -Wpointer-arith \
  42 -Wpointer-sign \
  43 -Wno-unused -Wunused-value -Wunused-function \
  44 -Wno-switch -Wno-char-subscripts -Wmissing-prototypes
  45 -Wdeclaration-after-statement -Wempty-body -Wmissing-parameter-type \
  46 -Wold-style-declaration -Wold-style-definition"
  47
  48 # Enable -Wno-format by default when using gcc on mingw since many
  49 # GCC versions complain about %I64.
  50 case "${host}" in
  51   *-*-mingw32*) build_warnings="$build_warnings -Wno-format" ;;
  52   *) build_warnings="$build_warnings -Wformat-nonliteral" ;;
  53 esac
  54
  55 AC_ARG_ENABLE(build-warnings,
  56 AS_HELP_STRING([--enable-build-warnings], [enable build-time compiler warnings if gcc is used]),
  57 [case "${enableval}" in
  58   yes)  ;;
  59   no)   build_warnings="-w";;
  60   ,*)   t=`echo "${enableval}" | sed -e "s/,/ /g"`
  61         build_warnings="${build_warnings} ${t}";;
  62   *,)   t=`echo "${enableval}" | sed -e "s/,/ /g"`
  63         build_warnings="${t} ${build_warnings}";;
  64   *)    build_warnings=`echo "${enableval}" | sed -e "s/,/ /g"`;;
  65 esac
  66 if test x"$silent" != x"yes" && test x"$build_warnings" != x""; then
  67   echo "Setting compiler warning flags = $build_warnings" 6>&1
  68 fi])dnl
  69 AC_ARG_ENABLE(sim-build-warnings,
  70 AS_HELP_STRING([--enable-sim-build-warnings], [enable SIM specific build-time compiler warnings if gcc is used]),
  71 [case "${enableval}" in
  72   yes)  ;;
  73   no)   build_warnings="-w";;
  74   ,*)   t=`echo "${enableval}" | sed -e "s/,/ /g"`
  75         build_warnings="${build_warnings} ${t}";;
  76   *,)   t=`echo "${enableval}" | sed -e "s/,/ /g"`
  77         build_warnings="${t} ${build_warnings}";;
  78   *)    build_warnings=`echo "${enableval}" | sed -e "s/,/ /g"`;;
  79 esac
  80 if test x"$silent" != x"yes" && test x"$build_warnings" != x""; then
  81   echo "Setting GDB specific compiler warning flags = $build_warnings" 6>&1
  82 fi])dnl
  83 WARN_CFLAGS=""
  84 if test "x${build_warnings}" != x -a "x$GCC" = xyes
  85 then
  86     AC_MSG_CHECKING(compiler warning flags)
  87     # Separate out the -Werror flag as some files just cannot be
  88     # compiled with it enabled.
  89     for w in ${build_warnings}; do
  90         case $w in
  91         -Werr*) WERROR_CFLAGS=-Werror ;;
  92         *) # Check that GCC accepts it
  93             saved_CFLAGS="$CFLAGS"
  94             CFLAGS="$CFLAGS $w"
  95             AC_TRY_COMPILE([],[],WARN_CFLAGS="${WARN_CFLAGS} $w",)
  96             CFLAGS="$saved_CFLAGS"
  97         esac
  98     done
  99     AC_MSG_RESULT(${WARN_CFLAGS} ${WERROR_CFLAGS})
 100 fi
 101 ])
 102 AC_SUBST(WARN_CFLAGS)
 103 AC_SUBST(WERROR_CFLAGS)