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dnl
dnl Taken from gnome-common/macros2/gnome-compiler-flags.m4
dnl
dnl We've added:
dnl -Wextra -Wshadow -Wcast-align -Wwrite-strings -Waggregate-return -Wstrict-prototypes -Winline -Wredundant-decls
dnl We've removed
dnl CFLAGS="$realsave_CFLAGS"
dnl to avoid clobbering user-specified CFLAGS
dnl
AC_DEFUN([VIRT_VIEWER_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([$1],[maximum])"])
warnCFLAGS=
try_compiler_flags="-fexceptions -fstack-protector --param=ssp-buffer-size=4 -fasynchronous-unwind-tables"
case "$enable_compile_warnings" in
no)
;;
minimum)
try_compiler_flags="$try_compiler_flags -Wall"
;;
yes)
try_compiler_flags="$try_compiler_flags -Wall -Wmissing-prototypes -std=c99"
;;
maximum|error)
try_compiler_flags="$try_compiler_flags -Wall -Wmissing-prototypes -std=c99 -Wnested-externs -Wpointer-arith"
try_compiler_flags="$try_compiler_flags -Wextra -Wshadow -Wcast-align -Wwrite-strings -Waggregate-return"
# Removed -Wstrict-prototypes to avoid GTK bug
try_compiler_flags="$try_compiler_flags -Winline -Wredundant-decls -Wno-sign-compare"
if test "$enable_compile_warnings" = "error" ; then
try_compiler_flags="$try_compiler_flags -Werror"
fi
;;
*)
AC_MSG_ERROR(Unknown argument '$enable_compile_warnings' to --enable-compile-warnings)
;;
esac
AH_VERBATIM([FORTIFY_SOURCE],
[/* Enable compile-time and run-time bounds-checking, and some warnings. */
#if defined __OPTIMIZE__ && __OPTIMIZE__
# define _FORTIFY_SOURCE 2
#endif
])
compiler_flags=
for option in $try_compiler_flags; do
SAVE_CFLAGS="$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 $has_option = yes; then
compiler_flags="$compiler_flags $option"
fi
unset has_option
unset SAVE_CFLAGS
done
unset option
unset try_compiler_flags
AC_ARG_ENABLE(iso-c,
AC_HELP_STRING([--enable-iso-c],
[Try to warn if code is not ISO C ]),,
[enable_iso_c=no])
AC_MSG_CHECKING(what language compliance flags to pass to the C compiler)
complCFLAGS=
if test "x$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($complCFLAGS)
WARN_CFLAGS="$compiler_flags $complCFLAGS"
AC_SUBST(WARN_CFLAGS)
])
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