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libstdc++: Set active union member in constexpr std::string [PR103295]

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Clang still complains about using std::string in constexpr contexts due
to the changes made in commit 98a0d72a. This patch ensures that we set
the active member of the union as according to [class.union.general] p6.

libstdc++-v3/ChangeLog:

	PR libstdc++/103295
	* include/bits/basic_string.h (_M_use_local_data): Set active
	member to _M_local_buf.

Signed-off-by: Nathaniel Shead <nathanieloshead@gmail.com>
This commit is contained in:
Nathaniel Shead 2022-11-11 22:23:31 +11:00 • committed by Jonathan Wakely
parent b331bf303b
commit 52672be7d3
1 changed files with 2 additions and 2 deletions
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4
libstdc++-v3/include/bits/basic_string.h
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@ -352,8 +352,8 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
{
#if __cpp_lib_is_constant_evaluated
if (std::is_constant_evaluated())
for (_CharT& __c : _M_local_buf)
__c = _CharT();
for (size_type __i = 0; __i <= _S_local_capacity; ++__i)
_M_local_buf[__i] = _CharT();
#endif
return _M_local_data();
}