[gcc r15-8880] libstdc++: Cast -1 to size_t in [PR119429]

[Jonathan Wakely via Gcc-cvs]

https://gcc.gnu.org/g:039cc50867000e6427924ca490dc810eaa44cf08

commit r15-8880-g039cc50867000e6427924ca490dc810eaa44cf08
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Mon Mar 24 21:25:20 2025 +0000

    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.

Diff:
---
 libstdc++-v3/include/std/format | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/include/std/format b/libstdc++-v3/include/std/format
index 1b38913359d1..c3327e1d3841 100644
--- a/libstdc++-v3/include/std/format
+++ b/libstdc++-v3/include/std/format
@@ -4051,7 +4051,7 @@ namespace __format
       } _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)
       { }