From f431bb813df169858540b8a819cedeb1805515c9 Mon Sep 17 00:00:00 2001
From: James Le Cuirot <chewi@gentoo.org>
Date: Sun, 3 Aug 2025 23:42:08 +0100
Subject: [PATCH] compiler.h: Fix libc++ build now that _LIBCPP_FALLTHROUGH has
 gone

This has been dropped in favour of [[__fallthrough__]].

https://github.com/llvm/llvm-project/commit/cb43fe33b5d5084cf3b5a2723a03b692edb68018

Signed-off-by: James Le Cuirot <chewi@gentoo.org>
--- a/include/compiler.h
+++ b/include/compiler.h
@@ -3,7 +3,11 @@
 #else
 	#include <ciso646>
 	#ifdef _LIBCPP_VERSION
-		#define fallthrough _LIBCPP_FALLTHROUGH()
+		#ifdef _LIBCPP_FALLTHROUGH
+			#define fallthrough _LIBCPP_FALLTHROUGH()
+		#else
+			#define fallthrough [[__fallthrough__]]
+		#endif // _LIBCPP_FALLTHROUGH
 	#else
 		#ifdef __clang__
 			#define fallthrough [[clang::fallthrough]]
-- 
2.50.1