[llvm] d2a7a24 - Add __attribute__((retain)) to LLVM_DUMP_METHOD (#133025)

[via llvm-commits]

Author: Matthias Braun
Date: 2025-03-26T12:02:31-07:00
New Revision: d2a7a249c567cb170f22fe6e932896f9298b581d

URL: https://github.com/llvm/llvm-project/commit/d2a7a249c567cb170f22fe6e932896f9298b581d
DIFF: https://github.com/llvm/llvm-project/commit/d2a7a249c567cb170f22fe6e932896f9298b581d.diff

LOG: Add __attribute__((retain)) to LLVM_DUMP_METHOD (#133025)

Without the retain attribute the dump functions will be stripped when
LLVM is compiled with `-ffunction-section -Wl,--gc-sections` on
ELF-based systems.

Added: 
    

Modified: 
    llvm/include/llvm/Support/Compiler.h

Removed: 
    


################################################################################
diff  --git a/llvm/include/llvm/Support/Compiler.h b/llvm/include/llvm/Support/Compiler.h
index dc8b5389069eb..ff6f5e44ae2f1 100644
--- a/llvm/include/llvm/Support/Compiler.h
+++ b/llvm/include/llvm/Support/Compiler.h
@@ -230,6 +230,12 @@
 #define LLVM_ATTRIBUTE_USED
 #endif
 
+#if __has_attribute(retain)
+#define LLVM_ATTRIBUTE_RETAIN __attribute__((__retain__))
+#else
+#define LLVM_ATTRIBUTE_RETAIN
+#endif
+
 #if defined(__clang__)
 #define LLVM_DEPRECATED(MSG, FIX) __attribute__((deprecated(MSG, FIX)))
 #else
@@ -619,7 +625,8 @@ void AnnotateIgnoreWritesEnd(const char *file, int line);
 /// get stripped in release builds.
 // FIXME: Move this to a private config.h as it's not usable in public headers.
 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
-#define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE LLVM_ATTRIBUTE_USED
+#define LLVM_DUMP_METHOD                                                       \
+  LLVM_ATTRIBUTE_NOINLINE LLVM_ATTRIBUTE_USED LLVM_ATTRIBUTE_RETAIN
 #else
 #define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE
 #endif