From: Jonathan Wakely <jwakely@redhat.com>
Date: Mon, 24 Mar 2025 21:25:20 +0000 (+0000)
Subject: libstdc++: Cast -1 to size_t in <format> [PR119429]
X-Git-Tag: releases/gcc-14.3.0~348
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=65670b788d4624d54b270d51ec846d93133e5c50;p=thirdparty%2Fgcc.git

libstdc++: Cast -1 to size_t in <format> [PR119429]

This avoids a runtime error from Clang's annoying -fsanitize=integer
(even though it's not undefined and behaves correctly).

libstdc++-v3/ChangeLog:

	PR libstdc++/119429
	* include/std/format (__format::_Scanner::_Scanner): Cast
	default argument to size_t.

(cherry picked from commit 039cc50867000e6427924ca490dc810eaa44cf08)
---

diff --git a/libstdc++-v3/include/std/format b/libstdc++-v3/include/std/format
index 5720bf069b4..f64947a0e29 100644
--- a/libstdc++-v3/include/std/format
+++ b/libstdc++-v3/include/std/format
@@ -3903,7 +3903,7 @@ namespace __format
       basic_format_parse_context<_CharT> _M_pc;
 
       constexpr explicit
-      _Scanner(basic_string_view<_CharT> __str, size_t __nargs = -1)
+      _Scanner(basic_string_view<_CharT> __str, size_t __nargs = (size_t)-1)
       : _M_pc(__str, __nargs)
       { }