From: Jonathan Wakely <jwakely@redhat.com>
Date: Fri, 4 Jul 2025 16:03:27 +0000 (+0100)
Subject: libstdc++: Avoid -Wswitch warning from chrono formatters
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=eeea445e1d0f0aac813d4eccd7b8f55477772dd0;p=thirdparty%2Fgcc.git

libstdc++: Avoid -Wswitch warning from chrono formatters

Add a default case to the switch to suppress warnings about unhandled
enumeration values. This is a consteval function, so if the default case
is ever reached it will be an error not silent miscompilation.

libstdc++-v3/ChangeLog:

	* include/bits/chrono_io.h (__formatter_duration::_S_spec_for):
	Add default case to switch and use __builtin_unreachable.
---

diff --git a/libstdc++-v3/include/bits/chrono_io.h b/libstdc++-v3/include/bits/chrono_io.h
index bcf9830fb9e..72cd569ccd6 100644
--- a/libstdc++-v3/include/bits/chrono_io.h
+++ b/libstdc++-v3/include/bits/chrono_io.h
@@ -1841,6 +1841,8 @@ namespace __format
 	      break;
 	    case _None:
 	      break;
+	    default:
+	      __builtin_unreachable();
 	    }
 	  return __res;
 	};