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|
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
AC_DEFUN([GNOME_COMPILE_WARNINGS],[
dnl ******************************
dnl More compiler warnings
dnl ******************************
AC_ARG_ENABLE(compile-warnings,
AC_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="$CFLAGS"
dnl These are warning flags that aren't marked as fatal. Can be
dnl overridden on a per-project basis with -Wno-foo.
base_warn_flags=" \
-Wall \
-Wstrict-prototypes \
-Wnested-externs \
"
dnl These compiler flags typically indicate very broken or suspicious
dnl code. Some of them such as implicit-function-declaration are
dnl just not default because gcc compiles a lot of legacy code.
dnl We choose to make this set into explicit errors.
base_error_flags=" \
-Werror=missing-prototypes \
-Werror=implicit-function-declaration \
-Werror=pointer-arith \
-Werror=init-self \
-Werror=format-security \
-Werror=format=2 \
-Werror=missing-include-dirs \
"
case "$enable_compile_warnings" in
no)
warning_flags=
;;
minimum)
warning_flags="-Wall"
;;
yes)
warning_flags="$base_warn_flags $base_error_flags"
;;
maximum|error)
warning_flags="$base_warn_flags $base_error_flags"
;;
*)
AC_MSG_ERROR(Unknown argument '$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($tested_warning_flags)
AC_ARG_ENABLE(iso-c,
AC_HELP_STRING([--enable-iso-c],
[Try to warn if code is not ISO C ]),,
[enable_iso_c=no])
AC_MSG_CHECKING(what language compliance flags to pass to the C compiler)
complCFLAGS=
if test "x$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)
])
dnl For C++, do basically the same thing.
AC_DEFUN([GNOME_CXX_WARNINGS],[
AC_ARG_ENABLE(cxx-warnings,
AC_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,
AC_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)
])
|
