From: Jonathan Wakely <jwakely@redhat.com>
Date: Fri, 27 Sep 2024 15:54:31 +0000 (+0100)
Subject: libstdc++: Tweak %c formatting for chrono types
X-Git-Tag: basepoints/gcc-16~5349
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ce89d2f3170e0d6474cee2c5cb9d478426a5b2f6;p=thirdparty%2Fgcc.git

libstdc++: Tweak %c formatting for chrono types

libstdc++-v3/ChangeLog:

	* include/bits/chrono_io.h (__formatter_chrono::_M_c): Add
	[[unlikely]] attribute to condition for missing %c format in
	locale. Use %T instead of %H:%M:%S in fallback.
---

diff --git a/libstdc++-v3/include/bits/chrono_io.h b/libstdc++-v3/include/bits/chrono_io.h
index a337007266e..652e88ffe3a 100644
--- a/libstdc++-v3/include/bits/chrono_io.h
+++ b/libstdc++-v3/include/bits/chrono_io.h
@@ -899,8 +899,8 @@ namespace __format
 	  const _CharT* __formats[2];
 	  __tp._M_date_time_formats(__formats);
 	  const _CharT* __rep = __formats[__mod];
-	  if (!*__rep)
-	    __rep = _GLIBCXX_WIDEN("%a %b %e %H:%M:%S %Y");
+	  if (!*__rep) [[unlikely]]
+	    __rep = _GLIBCXX_WIDEN("%a %b %e %T %Y");
 	  basic_string<_CharT> __fmt(_S_empty_spec);
 	  __fmt.insert(1u, 1u, _S_colon);
 	  __fmt.insert(2u, __rep);