?RCS: $Id: d_fast_assert.U 12249 2006-11-07 04:40:07Z cbiere $
?RCS:
?RCS: @COPYRIGHT@
?RCS:
?MAKE:d_fast_assert: Myread Setvar cat gccversion spackage \
	sed +ccflags +cc +ldflags
?MAKE:	-pick add $@ %<
?S:d_fast_assert:
?S:	This variable conditionally defines FAST_ASSERTIONS.
?S:.
?C:FAST_ASSERTIONS:
?C:	This symbol, when defined, indicates that the program should make
?C:	use of its own asserting and failure reporting code, instead of
?C:	the one from glib.
?C:.
?H:#$d_fast_assert FAST_ASSERTIONS	/**/
?H:.
?F:!try.c !try
?LINT:set d_fast_assert
?LINT:change ccflags
: determine whether to enable fast assertions
echo " "
case "$d_fast_assert" in
"$undef")
	dflt=n;;
*)
	dflt=y;;
esac
$cat <<EOM
$spackage contains code called "fast assertions" which are lightweight
assertions in terms of code space used.  They use much less code than
their glib counterpart, and therefore should be more efficient.

EOM
rp='Shall I enable "fast assertions"'
. ./myread
case "$ans" in
y) val="$define";;
*) val="$undef";;
esac
set d_fast_assert
eval $setvar
?X: When gcc is used, see whether we can use -momit-leaf-frame-pointer
?X: This is useful for tail routines containing assertions if they use
?X: "fast assertions", given that the code is not calling any routine.
case "$gccversion" in
'') ;;
*)
	case "$d_fast_assert" in
	"$define")
		$cat >try.c <<'EOC'
int main()
{
	return 0;
}
EOC
		if $cc $ccflags -momit-leaf-frame-pointer $ldflags \
			-o try try.c >/dev/null 2>&1
		then
			dflt=y
		else
			dflt=n
		fi
		$cat <<EOM

You're using gcc$gccversion.

That compiler supports the -momit-leaf-frame-pointer flag, to remove the
use of the frame pointer for leaf functions and therefore save a register.
This combines nicely with "fast assertions", which you enabled, to save
the most code space in leaf routines and allow them to use most of the
CPU registers.

EOM
		rp="Shall I enable the -momit-leaf-frame-pointer flag"
		. ./myread
		case "$ans" in
		y)
			case "$ccflags" in
			*-momit-leaf-frame-pointer*) ;;
			*)
				ccflags="$ccflags -momit-leaf-frame-pointer"
				echo "Added -momit-leaf-frame-pointer to the cc flags." >&4
				;;
			esac
			;;
		*)
			case "$ccflags" in
			*-momit-leaf-frame-pointer*)
				echo "Stripping -momit-leaf-frame-pointer from cc flags." >&4
				ccflags=`echo $ccflags | $sed 's/ *-momit-leaf-frame-pointer//'`
				;;
			esac
			;;
		esac
		;;
	esac
	;;
esac