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f60dbb57967982f456f48d6f904246f73c6bc905
gcc/libstdc++-v3/include/bits
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Jonathan Wakely f60dbb5796 libstdc++: Improve diagnostics for std::allocator<incomplete type> 
Using requires { sizeof(T); } in __new_allocator::allocate gives a
better diagnostic when the static_assert fails.

We can also reduce the total number of diagnostics due to invalid
sizeof(T) and alignof(T) by using the same requires-expression to make
the body of the function a discarded statement when the static_assert
already failed. This fixes a regression in diagnostic quality due to
making __new_allocator::allocate constexpr in r16-7271-g7197d0cce70525,
which caused a cascade of seven errors instead of just one for
std::allocator<incomplete-type>().allocate(1).

libstdc++-v3/ChangeLog:

	* include/bits/allocator.h (allocator::allocate): Use specific
	feature test macro for constexpr allocate and deallocate. Make
	consteval path a discarded statement if sizeof(T) is ill-formed.
	* include/bits/new_allocator.h (__new_allocator::allocate): Use
	requires-expression for static_cast. Make function body a
	discarded stament if sizeof(T) is ill-formed. Use if-constexpr
	for alignment checks.

Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com>
2026-03-16 15:17:45 +00:00
..
algorithmfwd.h
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2026-01-02 09:56:11 +01:00
align.h
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2026-01-02 09:56:11 +01:00
alloc_traits.h
libstdc++: Add allocate_at_least (P0401) [PR118030]
2026-03-10 13:38:23 -04:00
allocated_ptr.h
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2026-01-02 09:56:11 +01:00
allocator.h
libstdc++: Improve diagnostics for std::allocator<incomplete type>
2026-03-16 15:17:45 +00:00
atomic_base.h
libstdc++: complete P0493R5 with pointer support
2026-02-26 21:11:07 +08:00
atomic_futex.h
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2026-01-02 09:56:11 +01:00
atomic_timed_wait.h
libstdc++: Fix proxy wait detection in atomic wait
2026-01-09 19:18:21 +00:00
atomic_wait.h
libstdc++: Add platform wait functions for FreeBSD [PR120527]
2026-03-09 16:44:11 +00:00
basic_ios.h
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2026-01-02 09:56:11 +01:00
basic_ios.tcc
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basic_string.h
libstdc++: Use specific feature test macro for #if in <string>
2026-03-10 10:33:45 +00:00
basic_string.tcc
libstdc++: Implement rvalue overload for basic_string::substr() [PR119745]
2026-02-16 18:26:35 +01:00
binders.h
libstdc++: Use deducing this in std::bind_front even in C++20 [PR111327]
2025-12-05 12:15:08 -05:00
boost_concept_check.h
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c++0x_warning.h
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c++config
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char_traits.h
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charconv.h
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2026-01-02 09:56:11 +01:00
chrono_io.h
libstdc++: Fix chrono::parse to read from wide strings [PR123147]
2025-12-19 14:00:07 +00:00
chrono.h
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codecvt.h
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concept_check.h
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2026-01-02 09:56:11 +01:00
cow_string.h
libstdc++: Fix incorrect noexcept on string::compare overloads [PR123991]
2026-02-10 10:05:30 +00:00
cpp_type_traits.h
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cpyfunc_impl.h
libstdc++: Pass small trivial types by value in polymorphic wrappers
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deque.tcc
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elements_of.h
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enable_special_members.h
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2026-01-02 09:56:11 +01:00
erase_if.h
libstdc++: Fix std::erase_if for std::string with -D_GLIBCXX_USE_CXX11_ABI=0.
2026-01-19 10:17:47 +01:00
formatfwd.h
libstdc++: Implement C++26 P3378R2 - constexpr exception types
2025-12-11 19:54:44 +01:00
forward_list.h
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forward_list.tcc
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fs_dir.h
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fs_fwd.h
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fs_ops.h
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fs_path.h
libstdc++: Remove unnecessary string in filesystem::path formatter
2026-03-06 11:35:24 +01:00
fstream.tcc
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funcref_impl.h
libstdc++: Make function_ref non-dangling for stateless wrappers
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functexcept.h
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functional_hash.h
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funcwrap.h
libstdc++: Make function_ref non-dangling for stateless wrappers
2026-02-11 17:54:09 +01:00
gslice_array.h
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gslice.h
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hashtable_policy.h
libstdc++: container heterogeneous insertion (P2363) [PR117402]
2026-03-04 03:59:15 -05:00
hashtable.h
libstdc++: container heterogeneous insertion (P2363) [PR117402]
2026-03-04 03:59:15 -05:00
indirect_array.h
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indirect.h
libstdc++: Fix allocator propagation and tests for std::indirect and std::polymorphic
2025-10-08 17:06:20 +01:00
intcmp.h
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invoke.h
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ios_base.h
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istream.tcc
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iterator_concepts.h
c++: C++26 Reflection [PR120775]
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list.tcc
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locale_classes.h
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locale_classes.tcc
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locale_conv.h
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locale_facets_nonio.h
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locale_facets.h
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locale_facets.tcc
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localefwd.h
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mask_array.h
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max_size_type.h
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memory_resource.h
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memoryfwd.h
libstdc++: Add allocate_at_least (P0401) [PR118030]
2026-03-10 13:38:23 -04:00
mofunc_impl.h
libstdc++: Pass small trivial types by value in polymorphic wrappers
2025-06-02 13:52:35 +02:00
monostate.h
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move.h
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new_allocator.h
libstdc++: Improve diagnostics for std::allocator<incomplete type>
2026-03-16 15:17:45 +00:00
new_except.h
libstdc++: Use gnu_inline attribute on constexpr exception methods [PR123183]
2026-01-07 15:07:33 +01:00
new_throw.h
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node_handle.h
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ostream_insert.h
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ostream.h
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ostream.tcc
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out_ptr.h
libstdc++: Fix doxygen comment for std::out_ptr [PR124024]
2026-02-09 20:43:16 +00:00
parse_numbers.h
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postypes.h
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predefined_ops.h
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ptr_traits.h
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quoted_string.h
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random.h
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random.tcc
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range_access.h
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ranges_algo.h
libstdc++: Do not use projection for ranges::replace default args (LWG 4444)
2026-03-10 18:22:28 +00:00
ranges_algobase.h
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ranges_base.h
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ranges_cmp.h
libstdc++: Use overload operator<=> when provided in relational functors [PR114153]
2026-01-19 12:09:11 +01:00
ranges_uninitialized.h
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ranges_util.h
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refwrap.h
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regex_automaton.h
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regex_automaton.tcc
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regex_compiler.h
libstdc++: Reference C++11 standard more precisely in regex comments
2026-03-03 12:05:49 +00:00
regex_compiler.tcc
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regex_constants.h
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regex_error.h
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regex_executor.h
libstdc++/regex: Remove now unused __dfs_mode template parameter
2026-02-09 20:04:12 -05:00
regex_executor.tcc
libstdc++/regex: Avoid -Wunused-parameter warnings in _Executor
2026-02-12 15:17:57 -05:00
regex_scanner.h
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regex_scanner.tcc
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regex.h
libstdc++/regex: Remove now unused __dfs_mode template parameter
2026-02-09 20:04:12 -05:00
regex.tcc
libstdc++: Optimize std::regex_traits lookup functions
2026-02-11 11:00:03 +00:00
requires_hosted.h
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sat_arith.h
libstdc++: Extend __is_standard_integer to cover extended integer types
2025-12-08 18:55:02 +00:00
semaphore_base.h
libstdc++: Ensure counting_semaphore::try_acquire_for times out [PR122878]
2026-01-09 19:18:21 +00:00
shared_ptr_atomic.h
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shared_ptr_base.h
libstdc++: Disable false positive middle end warnings in std::shared_ptr [PR122197]
2026-01-28 10:28:09 +00:00
shared_ptr.h
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slice_array.h
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specfun.h
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sstream.tcc
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std_abs.h
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std_function.h
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std_mutex.h
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std_thread.h
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stdexcept_except.h
libstdc++: Use gnu_inline attribute on constexpr exception methods [PR123183]
2026-01-07 15:07:33 +01:00
stdexcept_throw.h
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stdexcept_throwdef.h
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stdexcept_throwfwd.h
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stl_algo.h
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stl_algobase.h
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stl_bvector.h
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stl_construct.h
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stl_deque.h
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stl_function.h
libstdc++: Make function_ref non-dangling for stateless wrappers
2026-02-11 17:54:09 +01:00
stl_heap.h
libstdc++: Fix handling iterators with proxy subscript in heap algorithms.
2026-01-13 19:14:26 +01:00
stl_iterator_base_funcs.h
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stl_iterator_base_types.h
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stl_iterator.h
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stl_list.h
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stl_map.h
libstdc++: container heterogeneous insertion (P2363) [PR117402]
2026-03-04 03:59:15 -05:00
stl_multimap.h
libstdc++: container erasure overloads (P2077) [PR117404]
2026-02-04 17:39:51 -05:00
stl_multiset.h
libstdc++: container erasure overloads (P2077) [PR117404]
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stl_numeric.h
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stl_pair.h
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stl_queue.h
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stl_relops.h
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stl_set.h
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stl_stack.h
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stl_tempbuf.h
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stl_tree.h
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stl_uninitialized.h
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stl_vector.h
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stream_iterator.h
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streambuf_iterator.h
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streambuf.tcc
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string_view.tcc
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stringfwd.h
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text_encoding-data.h
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this_thread_sleep.h
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unicode-data.h
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unicode.h
libstdc++: Ensure that _Utf_view is always a view.
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uniform_int_dist.h
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unique_lock.h
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unique_ptr.h
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unordered_map.h
libstdc++: container heterogeneous insertion (P2363) [PR117402]
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unordered_set.h
libstdc++: container heterogeneous insertion (P2363) [PR117402]
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uses_allocator_args.h
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uses_allocator.h
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utility.h
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valarray_after.h
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vector.tcc
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version.def
libstdc++: Add allocate_at_least (P0401) [PR118030]
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version.h
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version.tpl
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