From 1a1dd39367b5e94828e5c871133c15e5002e3477 Mon Sep 17 00:00:00 2001
From: Calvin Rose <calsrose@gmail.com>
Date: Sat, 18 Jun 2022 13:54:47 -0500
Subject: [PATCH] Use __builtin_alloca if no other option.

---
 src/core/ffi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/core/ffi.c b/src/core/ffi.c
index 49102b9d..1b77ccea 100644
--- a/src/core/ffi.c
+++ b/src/core/ffi.c
@@ -32,6 +32,9 @@
 #define alloca _alloca
 #elif defined(JANET_LINUX)
 #include <alloca.h>
+#elif !defined(alloca)
+/* Last ditch effort to get alloca - works for gcc and clang */
+#define alloca __builtin_alloca
 #endif
 
 #define JANET_FFI_MAX_RECUR 64