From: Jonathan Wakely <jwakely@redhat.com>
Date: Fri, 19 Nov 2021 18:27:59 +0000 (+0000)
Subject: libstdc++: One more change for Clang to support constexpr std::string [PR103295]
X-Git-Tag: basepoints/gcc-13~2892
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=1f8d01eb1476a997eb1fc686b60fccdf97747faa;p=thirdparty%2Fgcc.git

libstdc++: One more change for Clang to support constexpr std::string [PR103295]

All writes into the allocated buffer need to be via traits_type::assign
to begin lifetimes.

libstdc++-v3/ChangeLog:

	PR libstdc++/103295
	* include/bits/basic_string.tcc (_M_construct): Use the
	traits assign member to write into allcoated memory.
---

diff --git a/libstdc++-v3/include/bits/basic_string.tcc b/libstdc++-v3/include/bits/basic_string.tcc
index 374406c0e135..6f619a08f707 100644
--- a/libstdc++-v3/include/bits/basic_string.tcc
+++ b/libstdc++-v3/include/bits/basic_string.tcc
@@ -201,7 +201,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 		_M_data(__another);
 		_M_capacity(__capacity);
 	      }
-	    _M_data()[__len++] = *__beg;
+	    traits_type::assign(_M_data()[__len++], *__beg);
 	    ++__beg;
 	  }