From 14743c0dfdb81a6a4a051921e56a61c3b1e0e664 Mon Sep 17 00:00:00 2001
From: Peter Stephenson
Date: Mon, 26 Feb 2018 20:21:56 +0000
Subject: 42401: workaround for gcc -foptimize-strlen oddit.
Use realloc(NULL, ...) instead of malloc in zsh-mem calloc().
---
Src/mem.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
(limited to 'Src/mem.c')
diff --git a/Src/mem.c b/Src/mem.c
index 840bbb6e4..f1208197b 100644
--- a/Src/mem.c
+++ b/Src/mem.c
@@ -1719,7 +1719,13 @@ calloc(MALLOC_ARG_T n, MALLOC_ARG_T size)
if (!(l = n * size))
return (MALLOC_RET_T) m_high;
- r = malloc(l);
+ /*
+ * use realloc() (with a NULL `p` argument it behaves exactly the same
+ * as malloc() does) to prevent an infinite loop caused by sibling-call
+ * optimizations (the malloc() call would otherwise be replaced by an
+ * unconditional branch back to line 1719 ad infinitum).
+ */
+ r = realloc(NULL, l);
memset(r, 0, l);
--
cgit 1.4.1