From: Jonathan Wakely <jwakely@redhat.com>
Date: Sat, 12 Jul 2025 12:09:03 +0000 (+0100)
Subject: libstdc++: Constrain __gnu_debug::bitset(const CharT*) constructor [PR121046]
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=f534db54a65b42638c08275338423063fe836f31;p=thirdparty%2Fgcc.git

libstdc++: Constrain __gnu_debug::bitset(const CharT*) constructor [PR121046]

The r16-3435-gbbc0e70b610f19 change (for LWG 4294) needs to be applied
to the debug mode __gnu_debug::bitset as well as the normal one.

libstdc++-v3/ChangeLog:

	PR libstdc++/121046
	* include/debug/bitset (bitset(const CharT*, ...)): Add
	constraints on CharT type.
---

diff --git a/libstdc++-v3/include/debug/bitset b/libstdc++-v3/include/debug/bitset
index e4d3e6619c9..2f4bab84639 100644
--- a/libstdc++-v3/include/debug/bitset
+++ b/libstdc++-v3/include/debug/bitset
@@ -179,7 +179,13 @@ namespace __debug
       bitset(const _Base& __x) : _Base(__x) { }
 
 #if __cplusplus >= 201103L
-      template<typename _CharT>
+      // _GLIBCXX_RESOLVE_LIB_DEFECTS
+      // 4294. bitset(const CharT*) constructor needs to be constrained
+      template<typename _CharT,
+	       typename = _Require<is_trivially_copyable<_CharT>,
+				   is_standard_layout<_CharT>,
+				   is_trivially_default_constructible<_CharT>,
+				   __not_<is_array<_CharT>>>>
 	_GLIBCXX23_CONSTEXPR
         explicit
         bitset(const _CharT* __str,