Working Portage override script with -O3 *and* -fno-strict-aliasing

libgcrypt (text/plain), 2.83 KB, created by Guenther Brunthaler on 2009-05-01 14:28:31 UTC

#! /bin/false
#
# Symlink target for "/etc/portage/env/<category>/<package>".
# Changes compiler options for optimized except for strict aliasing,
# unless the "debug" USE-flag is set for the package, in which case
# the debugging options will be set instead.


# Whether space-separated string $1 contains token $2.
contains_ncm9q70alywv346gx4ug8hwrq() {
	test x"${1#$2}" != x"$1" && return
	test x"${1%$2}" != x"$1" && return
	test x"${1% $2 *}" != x"$1" && return
	return 1
}
# Check for debugging override.
if contains_ncm9q70alywv346gx4ug8hwrq "$USE" "debug" \
	|| contains_ncm9q70alywv346gx4ug8hwrq "$FEATURES" "noclean"
then
	unset -f contains_ncm9q70alywv346gx4ug8hwrq
	. /etc/portage/env/debugging
else
	unset -f contains_ncm9q70alywv346gx4ug8hwrq
	optimizer_filter_ncm9q70alywv346gx4ug8hwrq() {
		local STATE VI NEW TOKEN M SET
		STATE=1; VI=1
		while true; do
			case $STATE in
				1) # Start variable modification.
					# Set old contents as positional parameters.
					case $VI in
						1) set -- $CFLAGS;;
						2) set -- $CXXFLAGS;;
						3) set -- $FEATURES;;
						4) set -- $USE;;
					esac
					SET=
					# Define $SET as overrides corresponding to $VI.
					case $VI in
						1 | 2) SET="-O3 -DNDEBUG -fno-strict-aliasing -fno-omit-frame-pointer -fno-stack-check";;
					esac
					NEW=
					STATE=2
					;;
				2) # Modify next token if necessary.
					if test $# -eq 0; then
						STATE=3
						test -n "$SET" && NEW=$NEW${NEW:+ }$SET
						continue
					fi
					TOKEN=$1; shift
					M=
					case $VI in
						1 | 2)
							case $TOKEN in
								-O[0-9]) M=1;;
								-g*) M=1;;
								-DNDEBUG | -DDEBUG | -D_DEBUG) M=1;;
								-fomit-frame-pointer | -fno-omit-frame-pointer) M=1;;
								-fstack-check | -fno-stack-check) M=1;;
								-fno-eliminate-unused-debug-symbols | -feliminate-unused-debug-symbols) M=1;;
							esac
							;;
						3)
							case $TOKEN in
								nostrip | keeptemp | keepwork | noclean) M=1;;
							esac
							;;
						4)
							case $TOKEN in
								debug) M=1;;
							esac
							;;
					esac
					case $VI in
						1 | 2)
							case $TOKEN in
								-fstrict-aliasing) M=1;;
							esac
							;;
					esac
					if test -n "$M"; then
						# $TOKEN matches a debugging-relevant token.
						test -z "$SET" && continue
						TOKEN=$SET; SET=
					fi
					NEW=$NEW${NEW:+ }$TOKEN
					;;
				3) # Complete variable modification.
					case $VI in
						1) CFLAGS=$NEW; VI=2;;
						2) CXXFLAGS=$NEW; VI=3;;
						3) FEATURES=$NEW; VI=4;;
						4) USE=$NEW; return;;
					esac
					STATE=1
					;;
			esac
		done
	}
	optimizer_filter_ncm9q70alywv346gx4ug8hwrq
	unset -f optimizer_filter_ncm9q70alywv346gx4ug8hwrq
	echo "OVERRIDING FLAGS: optimized except for strict aliasing"
	if test -n "$PORTAGE_ENV_OVERRIDE_DEBUGGING"; then
		echo "CFLAGS=$CFLAGS"
		echo "CXXFLAGS=$CXXFLAGS"
		echo "FEATURES=$FEATURES"
		echo "USE=$USE"
	fi
fi