From 6f35ce045dd3ab57cac053301b1ebac4d5270501 Mon Sep 17 00:00:00 2001
From: Daniel Gibson <metalcaedes@gmail.com>
Date: Tue, 28 Mar 2023 19:14:29 +0200
Subject: [PATCH] _alloca16(): Use __builtin_alloca_with_align() on GCC

we're already using it with MinGW, no reason not to use it with
"normal" GCC on Unix (and clang, which also defines __GNUC__) as well.
---
 neo/sys/platform.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/neo/sys/platform.h b/neo/sys/platform.h
index 15ef90ee..d156d2fa 100644
--- a/neo/sys/platform.h
+++ b/neo/sys/platform.h
@@ -185,8 +185,13 @@ If you have questions concerning this license or the applicable additional terms
 // Unix
 #ifdef __unix__
 
-#define _alloca( x )				(({assert( (x)<ID_MAX_ALLOCA_SIZE );}), alloca( (x) ))
-#define _alloca16( x )				(({assert( (x)<ID_MAX_ALLOCA_SIZE );}),((void *)((((uintptr_t)alloca( (x)+15 )) + 15) & ~15)))
+#ifdef	__GNUC__
+  #define _alloca16( x )			( ({assert((x)<ID_MAX_ALLOCA_SIZE);}), __builtin_alloca_with_align( (x), 16*8 ) )
+  #define _alloca( x )				( ({assert((x)<ID_MAX_ALLOCA_SIZE);}), __builtin_alloca( (x) ) )
+#else
+  #define _alloca( x )				(({assert( (x)<ID_MAX_ALLOCA_SIZE );}), alloca( (x) ))
+  #define _alloca16( x )			(({assert( (x)<ID_MAX_ALLOCA_SIZE );}),((void *)((((uintptr_t)alloca( (x)+15 )) + 15) & ~15)))
+#endif
 
 #ifdef GAME_DLL
 #define ID_GAME_API					__attribute__((visibility ("default")))