142 lines
4.0 KiB
Plaintext
142 lines
4.0 KiB
Plaintext
dnl GNOME_COMPILE_WARNINGS
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dnl Turn on many useful compiler warnings
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dnl For now, only works on GCC
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AC_DEFUN([GNOME_COMPILE_WARNINGS],[
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dnl ******************************
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dnl More compiler warnings
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dnl ******************************
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AC_ARG_ENABLE(compile-warnings,
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AC_HELP_STRING([--enable-compile-warnings=@<:@no/minimum/yes/maximum/error@:>@],
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[Turn on compiler warnings]),,
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[enable_compile_warnings="m4_default([$1],[yes])"])
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warnCFLAGS=
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if test "x$GCC" != xyes; then
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enable_compile_warnings=no
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fi
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warning_flags=
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realsave_CFLAGS="$CFLAGS"
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case "$enable_compile_warnings" in
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no)
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warning_flags=
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;;
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minimum)
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warning_flags="-Wall"
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;;
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yes)
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warning_flags="-Wall -Wmissing-prototypes"
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;;
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maximum|error)
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warning_flags="-Wall -Wmissing-prototypes -Wnested-externs -Wpointer-arith"
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CFLAGS="$warning_flags $CFLAGS"
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for option in -Wno-sign-compare; do
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SAVE_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS $option"
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AC_MSG_CHECKING([whether gcc understands $option])
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AC_TRY_COMPILE([], [],
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has_option=yes,
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has_option=no,)
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CFLAGS="$SAVE_CFLAGS"
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AC_MSG_RESULT($has_option)
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if test $has_option = yes; then
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warning_flags="$warning_flags $option"
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fi
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unset has_option
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unset SAVE_CFLAGS
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done
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unset option
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if test "$enable_compile_warnings" = "error" ; then
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warning_flags="$warning_flags -Werror"
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fi
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;;
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*)
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AC_MSG_ERROR(Unknown argument '$enable_compile_warnings' to --enable-compile-warnings)
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;;
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esac
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CFLAGS="$realsave_CFLAGS"
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AC_MSG_CHECKING(what warning flags to pass to the C compiler)
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AC_MSG_RESULT($warning_flags)
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AC_ARG_ENABLE(iso-c,
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AC_HELP_STRING([--enable-iso-c],
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[Try to warn if code is not ISO C ]),,
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[enable_iso_c=no])
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AC_MSG_CHECKING(what language compliance flags to pass to the C compiler)
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complCFLAGS=
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if test "x$enable_iso_c" != "xno"; then
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if test "x$GCC" = "xyes"; then
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case " $CFLAGS " in
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*[\ \ ]-ansi[\ \ ]*) ;;
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*) complCFLAGS="$complCFLAGS -ansi" ;;
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esac
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case " $CFLAGS " in
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*[\ \ ]-pedantic[\ \ ]*) ;;
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*) complCFLAGS="$complCFLAGS -pedantic" ;;
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esac
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fi
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fi
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AC_MSG_RESULT($complCFLAGS)
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WARN_CFLAGS="$warning_flags $complCFLAGS"
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AC_SUBST(WARN_CFLAGS)
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])
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dnl For C++, do basically the same thing.
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AC_DEFUN([GNOME_CXX_WARNINGS],[
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AC_ARG_ENABLE(cxx-warnings,
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AC_HELP_STRING([--enable-cxx-warnings=@<:@no/minimum/yes@:>@]
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[Turn on compiler warnings.]),,
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[enable_cxx_warnings="m4_default([$1],[minimum])"])
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AC_MSG_CHECKING(what warning flags to pass to the C++ compiler)
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warnCXXFLAGS=
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if test "x$GXX" != xyes; then
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enable_cxx_warnings=no
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fi
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if test "x$enable_cxx_warnings" != "xno"; then
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if test "x$GXX" = "xyes"; then
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case " $CXXFLAGS " in
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*[\ \ ]-Wall[\ \ ]*) ;;
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*) warnCXXFLAGS="-Wall -Wno-unused" ;;
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esac
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## -W is not all that useful. And it cannot be controlled
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## with individual -Wno-xxx flags, unlike -Wall
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if test "x$enable_cxx_warnings" = "xyes"; then
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warnCXXFLAGS="$warnCXXFLAGS -Wshadow -Woverloaded-virtual"
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fi
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fi
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fi
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AC_MSG_RESULT($warnCXXFLAGS)
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AC_ARG_ENABLE(iso-cxx,
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AC_HELP_STRING([--enable-iso-cxx],
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[Try to warn if code is not ISO C++ ]),,
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[enable_iso_cxx=no])
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AC_MSG_CHECKING(what language compliance flags to pass to the C++ compiler)
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complCXXFLAGS=
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if test "x$enable_iso_cxx" != "xno"; then
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if test "x$GXX" = "xyes"; then
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case " $CXXFLAGS " in
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*[\ \ ]-ansi[\ \ ]*) ;;
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*) complCXXFLAGS="$complCXXFLAGS -ansi" ;;
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esac
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case " $CXXFLAGS " in
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*[\ \ ]-pedantic[\ \ ]*) ;;
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*) complCXXFLAGS="$complCXXFLAGS -pedantic" ;;
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esac
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fi
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fi
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AC_MSG_RESULT($complCXXFLAGS)
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WARN_CXXFLAGS="$CXXFLAGS $warnCXXFLAGS $complCXXFLAGS"
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AC_SUBST(WARN_CXXFLAGS)
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])
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