[sanitizer] Fix sigaction definition on 32-bit sparc
Patch by James Clarke.
@@ -635,9 +635,12 @@ namespace __sanitizer {
#ifndef __mips__
#if defined(__sparc__)
#if __GLIBC_PREREQ (2, 20)
- // On sparc glibc 2.19 and earlier sa_flags was unsigned long, and
- // __glibc_reserved0 didn't exist.
+ // On sparc glibc 2.19 and earlier sa_flags was unsigned long.
+#if defined(__arch64__)
+ // To maintain ABI compatibility on sparc64 when switching to an int,
+ // __glibc_reserved0 was added.
int __glibc_reserved0;
+#endif
int sa_flags;
#else
unsigned long sa_flags;
