From 2102fe32ff8191ad51001daf57a1ed09a1ebc824 Mon Sep 17 00:00:00 2001
From: Alan Wu <alanwu@ruby-lang.org>
Date: Mon, 16 Dec 2024 17:11:36 -0500
Subject: [PATCH] Detect ASAN when using older GCC versions

Newer GCCs have __has_feature and older ones have
__SANITIZE_ADDRESS__[1]. Relevant since ASAN with GCC 11 on the popular
Ubuntu Jammy failed to build previously.

[1]: https://gcc.gnu.org/onlinedocs/gcc-4.8.0/cpp/Common-Predefined-Macros.html
---
 internal/sanitizers.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/internal/sanitizers.h b/internal/sanitizers.h
index 0a830ae8f9..becf60bac2 100644
--- a/internal/sanitizers.h
+++ b/internal/sanitizers.h
@@ -16,7 +16,7 @@
 #endif
 
 #ifdef HAVE_SANITIZER_ASAN_INTERFACE_H
-# if __has_feature(address_sanitizer)
+# if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
 #  define RUBY_ASAN_ENABLED
 #  include <sanitizer/asan_interface.h>
 # endif