fix testing "gcc -mpreferred-stack-boundary=2" on x86_64

diff --git a/Rules.mak b/Rules.mak
index b3dec5b..86a7c48 100644 (file)
--- a/Rules.mak
+++ b/Rules.mak
@@ -184,7 +184,8 @@ ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586)$(CONFIG_586MMX),y)
        # NB: this may make SSE insns segfault!
        # -O1 -march=pentium3, -Os -msse etc are known to be affected.
        # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
-       OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=2,)
+       # -m32 is needed if host is 64-bit
+       OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
 else
        OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=4,)
 endif