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PR libstdc++/88840 delay evaluation of constant until type is complete

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Clang fails to compile std::vector<Incomplete> because the static member
__use_relocate cannot be evaluated for an incomplete type. Replace with
a static member function that will not be odr-used until needed, by
which point the type must be complete.

	PR libstdc++/88840
	* include/bits/stl_vector.h (vector::__use_relocate): Replace static
	data member with static member function _S_use_relocate().
	* include/bits/vector.tcc (vector::reserve, vector::_M_realloc_insert)
	(vector::_M_default_append): Use _S_use_relocate() instead of
	__use_relocate.

From-SVN: r268239
This commit is contained in:
Jonathan Wakely 2019-01-24 15:39:25 +00:00 committed by Jonathan Wakely
parent 400a08e284
commit e658669fe1
3 changed files with 19 additions and 9 deletions
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7
libstdc++-v3/ChangeLog
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@ -1,5 +1,12 @@
2019-01-24 Jonathan Wakely <jwakely@redhat.com>
PR libstdc++/88840
* include/bits/stl_vector.h (vector::__use_relocate): Replace static
data member with static member function _S_use_relocate().
* include/bits/vector.tcc (vector::reserve, vector::_M_realloc_insert)
(vector::_M_default_append): Use _S_use_relocate() instead of
__use_relocate.
* testsuite/27_io/filesystem/path/compare/strings.cc: Only compare
sign of results.

13
libstdc++-v3/include/bits/stl_vector.h
View File

@ -424,11 +424,14 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
private:
#if __cplusplus >= 201103L
static constexpr bool __use_relocate =
noexcept(std::__relocate_a(std::declval<pointer>(),
std::declval<pointer>(),
std::declval<pointer>(),
std::declval<_Tp_alloc_type&>()));
static constexpr bool
_S_use_relocate()
{
return noexcept(std::__relocate_a(std::declval<pointer>(),
std::declval<pointer>(),
std::declval<pointer>(),
std::declval<_Tp_alloc_type&>()));
}
#endif
protected:

8
libstdc++-v3/include/bits/vector.tcc
View File

@ -73,7 +73,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
const size_type __old_size = size();
pointer __tmp;
#if __cplusplus >= 201103L
if constexpr (__use_relocate)
if constexpr (_S_use_relocate())
{
__tmp = this->_M_allocate(__n);
std::__relocate_a(this->_M_impl._M_start,
@ -457,7 +457,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
__new_finish = pointer();
#if __cplusplus >= 201103L
if constexpr (__use_relocate)
if constexpr (_S_use_relocate())
{
__new_finish
= std::__relocate_a
@ -498,7 +498,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
__throw_exception_again;
}
#if __cplusplus >= 201103L
if constexpr (!__use_relocate)
if constexpr (!_S_use_relocate())
#endif
std::_Destroy(__old_start, __old_finish, _M_get_Tp_allocator());
_GLIBCXX_ASAN_ANNOTATE_REINIT;
@ -639,7 +639,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
_M_check_len(__n, "vector::_M_default_append");
pointer __new_start(this->_M_allocate(__len));
#if __cplusplus >= 201103L
if constexpr (__use_relocate)
if constexpr (_S_use_relocate())
{
__try
{