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184 lines
5.8 KiB
184 lines
5.8 KiB
# 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]])
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