[committed] libstdc++: Fix -Wsign-compare warnings in std::format

[Jonathan Wakely via Gcc-patches]

Tested x86_64-linux. Pushed to trunk.

-- >8 --

libstdc++-v3/ChangeLog:

        * include/std/format: Fix -Wsign-compare warnings.
---
 libstdc++-v3/include/std/format | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/libstdc++-v3/include/std/format b/libstdc++-v3/include/std/format
index f4fc85a16d2..561ae161d16 100644
--- a/libstdc++-v3/include/std/format
+++ b/libstdc++-v3/include/std/format
@@ -291,7 +291,7 @@ namespace __format
        }
       else
        {
-         constexpr size_t __n = 32;
+         constexpr int __n = 32;
          char __buf[__n]{};
          for (int __i = 0; __i < __n && __first != __last; ++__i)
            __buf[__i] = __first[__i];
@@ -1544,7 +1544,7 @@ namespace __format
 
              if (size_t __extras = int(__d == __p) + __z)
                {
-                 if (__dynbuf.empty() && __extras <= (__end - __res.ptr))
+                 if (__dynbuf.empty() && __extras <= size_t(__end - __res.ptr))
                    {
                      // Move exponent to make space for extra chars.
                      __builtin_memmove(__start + __p + __extras,
@@ -2357,7 +2357,7 @@ namespace __format
       _M_write(_CharT __c)
       {
        *_M_next++ = __c;
-       if (_M_next - _M_span.begin() == _M_span.size()) [[unlikely]]
+       if (_M_next - _M_span.begin() == std::ssize(_M_span)) [[unlikely]]
          _M_overflow();
       }
 
@@ -2469,7 +2469,7 @@ namespace __format
        auto __used = this->_M_used();
        if (_M_max < 0) // No maximum.
          _M_out = ranges::copy(__used, std::move(_M_out)).out;
-       else if (_M_count < _M_max)
+       else if (_M_count < size_t(_M_max))
          {
            auto __max = _M_max - _M_count;
            span<_CharT> __first;
-- 
2.38.1