[libc-commits] [libc] f074500 - [libc][macros] Define LIBC_CONSTINIT (#95316)

[via libc-commits]

Author: PiJoules
Date: 2024-06-12T15:39:04-07:00
New Revision: f074500b229837b482c4b88d4bdd0e53d1e24ed5

URL: https://github.com/llvm/llvm-project/commit/f074500b229837b482c4b88d4bdd0e53d1e24ed5
DIFF: https://github.com/llvm/llvm-project/commit/f074500b229837b482c4b88d4bdd0e53d1e24ed5.diff

LOG: [libc][macros] Define LIBC_CONSTINIT (#95316)

Added: 
    

Modified: 
    libc/src/__support/macros/attributes.h

Removed: 
    


################################################################################
diff  --git a/libc/src/__support/macros/attributes.h b/libc/src/__support/macros/attributes.h
index 8637e165fe3bc..c489a288fbb11 100644
--- a/libc/src/__support/macros/attributes.h
+++ b/libc/src/__support/macros/attributes.h
@@ -19,6 +19,10 @@
 
 #include "properties/architectures.h"
 
+#ifndef __has_attribute
+#define __has_attribute(x) 0
+#endif
+
 #define LIBC_INLINE inline
 #define LIBC_INLINE_VAR inline
 #define LIBC_INLINE_ASM __asm__ __volatile__
@@ -30,4 +34,12 @@
 #define LIBC_THREAD_LOCAL thread_local
 #endif
 
+#if __cplusplus >= 202002L
+#define LIBC_CONSTINIT constinit
+#elif __has_attribute(__require_constant_initialization__)
+#define LIBC_CONSTINIT __attribute__((__require_constant_initialization__))
+#else
+#define LIBC_CONSTINIT
+#endif
+
 #endif // LLVM_LIBC_SRC___SUPPORT_MACROS_ATTRIBUTES_H