From 8fb67f8574a6be8c8847d0f858b61ce063713d4e Mon Sep 17 00:00:00 2001
From: Yedidya Feldblum <yfeldblum@meta.com>
Date: Thu, 9 May 2024 12:09:13 -0700
Subject: [PATCH] FOLLY_ATTR_GNU_USED

Summary:
```
[[FOLLY_ATTR_GNU_USED]] void foo() {}
```

Differential Revision: D57165728

fbshipit-source-id: 5c492c7ccc890ebdb56db8c2cc5acbdd0fad8c71
---
 folly/CppAttributes.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/folly/CppAttributes.h b/folly/CppAttributes.h
index 9358a1bd56d..d2d48af1de2 100644
--- a/folly/CppAttributes.h
+++ b/folly/CppAttributes.h
@@ -145,3 +145,9 @@
 #else
 #define FOLLY_ATTR_CLANG_PRESERVE_ALL
 #endif
+
+#if FOLLY_HAS_CPP_ATTRIBUTE(gnu::used)
+#define FOLLY_ATTR_GNU_USED gnu::used
+#else
+#define FOLLY_ATTR_GNU_USED
+#endif