runtime: only define SEH when we need it.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/11769043

diff --git a/src/pkg/runtime/proc.c b/src/pkg/runtime/proc.c
index 9626d7980c43d739c1aaf1180cf88b57e77db0b6..0e9785e45682dd06e753e31a1f5194e7aa859156 100644 (file)
--- a/src/pkg/runtime/proc.c
+++ b/src/pkg/runtime/proc.c
@@ -485,10 +485,14 @@ runtime·starttheworld(void)
 void
 runtime·mstart(void)
 {
+#ifdef GOOS_windows
+#ifdef GOARCH_386
        // It is used by windows-386 only. Unfortunately, seh needs
        // to be located on os stack, and mstart runs on os stack
        // for both m0 and m.
        SEH seh;
+#endif
+#endif
 
        if(g != m->g0)
                runtime·throw("bad runtime·mstart");