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# gnome-compiler-flags.m4 |
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# |
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# serial 4 |
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# |
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dnl GNOME_COMPILE_WARNINGS |
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dnl Turn on many useful compiler warnings and substitute the result into |
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dnl WARN_CFLAGS |
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dnl For now, only works on GCC |
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dnl Pass the default value of the --enable-compile-warnings configure option as |
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dnl the first argument to the macro, defaulting to 'yes'. |
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dnl Additional warning/error flags can be passed as an optional second argument. |
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dnl |
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dnl For example: GNOME_COMPILE_WARNINGS([maximum],[-Werror=some-flag -Wfoobar]) |
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AU_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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AS_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([$1],[yes])"]) |
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if test "x$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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dnl These are warning flags that aren't marked as fatal. Can be |
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dnl overridden on a per-project basis with -Wno-foo. |
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base_warn_flags=" \ |
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-Wall \ |
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-Wstrict-prototypes \ |
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-Wnested-externs \ |
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" |
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dnl These compiler flags typically indicate very broken or suspicious |
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dnl code. Some of them such as implicit-function-declaration are |
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dnl just not default because gcc compiles a lot of legacy code. |
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dnl We choose to make this set into explicit errors. |
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base_error_flags=" \ |
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-Werror=missing-prototypes \ |
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-Werror=implicit-function-declaration \ |
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-Werror=pointer-arith \ |
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-Werror=init-self \ |
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-Werror=format-security \ |
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-Werror=format=2 \ |
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-Werror=missing-include-dirs \ |
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-Werror=return-type \ |
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" |
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dnl Additional warning or error flags provided by the module author to |
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dnl allow stricter standards to be imposed on a per-module basis. |
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dnl The author can pass -W or -Werror flags here as they see fit. |
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additional_flags="m4_default([$2],[])" |
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case "$enable_compile_warnings" in |
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no) |
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warning_flags="-w" |
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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|maximum|error) |
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warning_flags="$base_warn_flags $base_error_flags $additional_flags" |
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;; |
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*) |
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AC_MSG_ERROR(Unknown argument '$enable_compile_warnings' to --enable-compile-warnings) |
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;; |
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esac |
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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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dnl Check whether GCC supports the warning options |
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for option in $warning_flags; do |
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save_CFLAGS="$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 $has_option = yes; then |
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tested_warning_flags="$tested_warning_flags $option" |
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fi |
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unset has_option |
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unset save_CFLAGS |
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done |
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unset option |
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CFLAGS="$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($tested_warning_flags) |
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AC_ARG_ENABLE(iso-c, |
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AS_HELP_STRING([--enable-iso-c], |
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[Try to warn if code is not ISO C ]),, |
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[enable_iso_c=no]) |
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AC_MSG_CHECKING(what language compliance flags to pass to the C compiler) |
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complCFLAGS= |
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if test "x$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($complCFLAGS) |
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WARN_CFLAGS="$tested_warning_flags $complCFLAGS" |
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AC_SUBST(WARN_CFLAGS) |
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], |
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[[$0: This macro is deprecated. You should use AX_COMPILER_FLAGS instead and |
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eliminate use of --enable-iso-c. |
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See: http://www.gnu.org/software/autoconf-archive/ax_compiler_flags.html#ax_compiler_flags]]) |
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dnl For C++, do basically the same thing. |
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AU_DEFUN([GNOME_CXX_WARNINGS],[ |
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AC_ARG_ENABLE(cxx-warnings, |
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AS_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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AS_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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[[$0: This macro is deprecated. You should use AX_COMPILER_FLAGS instead and |
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eliminate use of --enable-iso-cxx. |
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See: http://www.gnu.org/software/autoconf-archive/ax_compiler_flags.html#ax_compiler_flags]]) |