File _service:obs_scm:backport-replace-builtin-strle... of Package syslinux

File _service:obs_scm:backport-replace-builtin-strlen-that-appears-to-get-optimized.patch of Package syslinux

From eae06bdce9468d7fde263de1c53f80f2faff0c9e Mon Sep 17 00:00:00 2001
From: Merlin Mathesius <mmathesi@redhat.com>
Date: Wed, 13 May 2020 11:58:37 -0500
Subject: [PATCH] Replace builtin strlen that appears to get optimized away
 
---
 dos/string.h | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)
 
diff --git a/dos/string.h b/dos/string.h
index f648de2d..407d0233 100644
--- a/dos/string.h
+++ b/dos/string.h
@@ -5,12 +5,22 @@
 #ifndef _STRING_H
 #define _STRING_H
 
+#include <stddef.h>
+
 /* Standard routines */
 #define memcpy(a,b,c)	__builtin_memcpy(a,b,c)
 #define memmove(a,b,c)	__builtin_memmove(a,b,c)
 #define memset(a,b,c)	__builtin_memset(a,b,c)
 #define strcpy(a,b)	__builtin_strcpy(a,b)
-#define strlen(a)	__builtin_strlen(a)
+#define strlen(a)	inline_strlen(a)
+
+/* replacement for builtin strlen that appears to get optimized away */
+static inline size_t inline_strlen(const char *str)
+{
+    size_t l;
+    for (l = 0; *str++; l++);
+    return l;
+}
 
 /* This only returns true or false */
 static inline int memcmp(const void *__m1, const void *__m2, unsigned int __n)
-- 
2.25.1