From 718b076e502c962e54436b89729fd74b52e7da36 Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sb@m-labs.hk>
Date: Tue, 22 Mar 2022 15:41:25 +0800
Subject: [PATCH] irrt: use __builtin_alloca

---
 nac3core/build.rs                | 1 -
 nac3core/src/codegen/irrt/irrt.c | 2 +-
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/nac3core/build.rs b/nac3core/build.rs
index 77ba9fa14..2c36a3db5 100644
--- a/nac3core/build.rs
+++ b/nac3core/build.rs
@@ -26,7 +26,6 @@ fn main() {
         "-S",
         "-Wall",
         "-Wextra",
-        "-Wno-implicit-function-declaration",
         "-o",
         "-",
     ];
diff --git a/nac3core/src/codegen/irrt/irrt.c b/nac3core/src/codegen/irrt/irrt.c
index 4c0914371..ba250dc9a 100644
--- a/nac3core/src/codegen/irrt/irrt.c
+++ b/nac3core/src/codegen/irrt/irrt.c
@@ -104,7 +104,7 @@ int32_t __nac3_list_slice_assign_var_size(
             || MAX(src_start, src_end) < MIN(dest_start, dest_end)
         );
     if (need_alloca) {
-        uint8_t *tmp = alloca(src_arr_len * size);
+        uint8_t *tmp = __builtin_alloca(src_arr_len * size);
         __builtin_memcpy(tmp, src_arr, src_arr_len * size);
         src_arr = tmp;
     }