From: Thomas Weißschuh <linux@weissschuh.net>
Date: Sat, 18 Apr 2026 10:31:54 +0000 (+0200)
Subject: tools/nolibc: avoid call to wcslen() in _start_c() inserted by clang
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=4c6826ee7d04f489ad6fcf46ae6dd595fe9c6295;p=thirdparty%2Fkernel%2Flinux.git

tools/nolibc: avoid call to wcslen() in _start_c() inserted by clang

Clang may convert the loop to find _auxv into a call to wcslen() which
is missing on nolibc. -fsanitize needs to be disabled for this to
happen.

Use the same pattern as in the nolibc strlen() implementation to avoid
the function call generation.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://patch.msgid.link/20260418-nolibc-wcslen-v1-1-671271b8ea63@weissschuh.net
---

diff --git a/tools/include/nolibc/crt.h b/tools/include/nolibc/crt.h
index d8ce91fd2e3b1..f38590a05adf0 100644
--- a/tools/include/nolibc/crt.h
+++ b/tools/include/nolibc/crt.h
@@ -89,7 +89,7 @@ void _start_c(long *sp)
 
 	/* find _auxv */
 	for (auxv = (void *)envp; *auxv++;)
-		;
+		__asm__("");
 	_auxv = auxv;
 
 #ifndef NOLIBC_IGNORE_ERRNO