[libc++] Fix use of std::errc() for C++ < 11 (#138522)

stbergmann · web-flow · commit b233c5fbe0af · 2025-05-12T15:55:24.000-04:00
After 8fc2538 "Reapply '[libc++] Optimize num_put integral functions' (#131613) (#133572)", including <locale> in C++03 mode with Debug hardening enabled fails. This patch fixes that by applying a workaround used elsewhere to construct errc in C++03 mode.
diff --git a/libcxx/include/locale b/libcxx/include/locale
@@ -1277,7 +1277,7 @@ _LIBCPP_HIDE_FROM_ABI inline _OutputIterator num_put<_CharT, _OutputIterator>::_
   }
 
   auto __res = std::__to_chars_integral(__buffer_ptr, __char_buffer + __buffer_size, __uval, __base);
-  _LIBCPP_ASSERT_INTERNAL(__res.__ec == std::errc(), "to_chars: invalid maximum buffer size computed?");
+  _LIBCPP_ASSERT_INTERNAL(__res.__ec == std::errc(0), "to_chars: invalid maximum buffer size computed?");
 
   // Make letters uppercase
   if (__flags & ios_base::hex && __flags & ios_base::uppercase) {

Original file line number	Diff line number	Diff line change
`@@ -1277,7 +1277,7 @@ _LIBCPP_HIDE_FROM_ABI inline _OutputIterator num_put<_CharT, _OutputIterator>::_`
`1277`	`1277`	`}`
`1278`	`1278`
`1279`	`1279`	`auto __res = std::__to_chars_integral(__buffer_ptr, __char_buffer + __buffer_size, __uval, __base);`
`1280`		`- _LIBCPP_ASSERT_INTERNAL(__res.__ec == std::errc(), "to_chars: invalid maximum buffer size computed?");`
	`1280`	`+ _LIBCPP_ASSERT_INTERNAL(__res.__ec == std::errc(0), "to_chars: invalid maximum buffer size computed?");`
`1281`	`1281`
`1282`	`1282`	`// Make letters uppercase`
`1283`	`1283`	`if (__flags & ios_base::hex && __flags & ios_base::uppercase) {`