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