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[PATCH v2] PR sanitizer/78992: Fix sigaction definition on 32-bit sparc


libsanitizer:
	PR sanitizer/78992
	* sanitizer_common/sanitizer_platform_limits_posix.h
	(struct __sanitizer_sigaction): Cherry-pick upstream r291561.
---
 libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h b/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h
index 066bf41ffef..c139322839a 100644
--- a/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h
+++ b/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h
@@ -633,9 +633,12 @@ 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;
-- 
2.11.0


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