[libcxx] [llvm] [ASan][libc++] Turn on ASan annotations for short strings (PR #79049)

[via llvm-commits]

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@@ -319,6 +319,9 @@ template <typename ReturnT, typename... ParamTs> class UniqueFunctionBase {
 
 #ifndef NDEBUG
     // In debug builds, we also scribble across the rest of the storage.
+#ifndef _LIBCPP_HAS_NO_ASAN
+    __asan_unpoison_memory_region(RHS.getInlineStorage(), InlineStorageSize);
+#endif
     memset(RHS.getInlineStorage(), 0xAD, InlineStorageSize);
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AdvenamTacet wrote:

What is a general way of checking if compiling with ASan? `defined(ADDRESS_SANITIZER) || defined(__SANITIZE_ADDRESS__)`?

https://github.com/llvm/llvm-project/pull/79049