libstdc++: Fix headers that can't be used as header units [PR 99413]

This adds missing includes to internal library headers which get
included from more than one other header, so that they can be compiled
as a stand-alone header unit.

For existing use cases these includes are no-ops because they're already
done by the header that includes these files. For compiling them as a
header unit, this ensures that they include what they use.

libstdc++-v3/ChangeLog:

	PR libstdc++/99413
	* include/bits/align.h: Include debug/assertions.h.
	* include/bits/codecvt.h: Include bits/c++config.h.
	* include/bits/enable_special_members.h: Likewise.
	* include/bits/erase_if.h: Likewise.
	* include/bits/functional_hash.h: Include <type_traits>.
	* include/bits/invoke.h: Include bits/move.h.
	* include/bits/ostream_insert.h: Include bits/exception_defines.h.
	* include/bits/parse_numbers.h: Include <type_traits>.
	* include/bits/predefined_ops.h: Include bits/c++config.h.
	* include/bits/range_access.h: Include bits/stl_iterator.h.
	* include/bits/stl_bvector.h: Do not include bits/stl_vector.h.
	* include/bits/stl_iterator.h: Include bits/stl_iterator_base_types.h.
	* include/bits/stl_uninitialized.h: Include bits/stl_algobase.h.
	* include/bits/uniform_int_dist.h: Include bits/concept_check.h.
	* include/bits/unique_lock.h: Include bits/std_mutex.h.
	* include/debug/assertions.h: Include bits/c++config.h.

libstdc++-v3/include/bits/align.h

@@ -34,6 +34,7 @@
 
 #include <bit>          // std::has_single_bit
 #include <stdint.h>     // uintptr_t
+#include <debug/assertions.h> // _GLIBCXX_DEBUG_ASSERT
 
 namespace std _GLIBCXX_VISIBILITY(default)
 {

libstdc++-v3/include/bits/codecvt.h

@@ -38,6 +38,9 @@
 
 #pragma GCC system_header
 
+#include <bits/c++config.h>
+#include <bits/locale_classes.h> // locale::facet
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION

libstdc++-v3/include/bits/enable_special_members.h

@@ -32,6 +32,8 @@
 
 #pragma GCC system_header
 
+#include <bits/c++config.h>
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION

libstdc++-v3/include/bits/erase_if.h

@@ -34,6 +34,8 @@
 
 #if __cplusplus >= 201402L
 
+#include <bits/c++config.h>
+
 namespace std
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION

libstdc++-v3/include/bits/functional_hash.h

@@ -32,6 +32,7 @@
 
 #pragma GCC system_header
 
+#include <type_traits>
 #include <bits/hash_bytes.h>
 
 namespace std _GLIBCXX_VISIBILITY(default)

libstdc++-v3/include/bits/invoke.h

@@ -37,6 +37,7 @@
 #else
 
 #include <type_traits>
+#include <bits/move.h> // forward
 
 namespace std _GLIBCXX_VISIBILITY(default)
 {

libstdc++-v3/include/bits/ostream_insert.h

@@ -34,6 +34,7 @@
 
 #include <iosfwd>
 #include <bits/cxxabi_forced.h>
+#include <bits/exception_defines.h>
 
 namespace std _GLIBCXX_VISIBILITY(default)
 {

libstdc++-v3/include/bits/parse_numbers.h

@@ -36,6 +36,7 @@
 
 #if __cplusplus >= 201402L
 
+#include <type_traits>
 #include <ext/numeric_traits.h>
 
 namespace std _GLIBCXX_VISIBILITY(default)

libstdc++-v3/include/bits/predefined_ops.h

@@ -30,6 +30,8 @@
 #ifndef _GLIBCXX_PREDEFINED_OPS_H
 #define _GLIBCXX_PREDEFINED_OPS_H	1
 
+#include <bits/move.h>
+
 namespace __gnu_cxx
 {
 namespace __ops

libstdc++-v3/include/bits/range_access.h

@@ -35,6 +35,7 @@
 #if __cplusplus >= 201103L
 #include <initializer_list>
 #include <type_traits>	    // common_type_t, make_signed_t
+#include <bits/stl_iterator.h> // reverse_iterator
 
 namespace std _GLIBCXX_VISIBILITY(default)
 {

libstdc++-v3/include/bits/stl_bvector.h

@@ -573,18 +573,6 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
       { return (__n + int(_S_word_bit) - 1) / int(_S_word_bit); }
     };
 
-_GLIBCXX_END_NAMESPACE_CONTAINER
-_GLIBCXX_END_NAMESPACE_VERSION
-} // namespace std
-
-// Declare a partial specialization of vector<T, Alloc>.
-#include <bits/stl_vector.h>
-
-namespace std _GLIBCXX_VISIBILITY(default)
-{
-_GLIBCXX_BEGIN_NAMESPACE_VERSION
-_GLIBCXX_BEGIN_NAMESPACE_CONTAINER
-
   /**
    *  @brief  A specialization of vector for booleans which offers fixed time
    *  access to individual elements in any order.

libstdc++-v3/include/bits/stl_iterator.h

@@ -61,6 +61,7 @@
 #define _STL_ITERATOR_H 1
 
 #include <bits/cpp_type_traits.h>
+#include <bits/stl_iterator_base_types.h>
 #include <ext/type_traits.h>
 #include <bits/move.h>
 #include <bits/ptr_traits.h>

libstdc++-v3/include/bits/stl_uninitialized.h

@@ -56,15 +56,16 @@
 #ifndef _STL_UNINITIALIZED_H
 #define _STL_UNINITIALIZED_H 1
 
-#if __cplusplus > 201402L
-#include <bits/stl_pair.h>
-#endif
-
 #if __cplusplus >= 201103L
 #include <type_traits>
 #endif
 
-#include <ext/alloc_traits.h>
+#include <bits/stl_algobase.h>    // copy
+#include <ext/alloc_traits.h>     // __alloc_traits
+
+#if __cplusplus >= 201703L
+#include <bits/stl_pair.h>
+#endif
 
 namespace std _GLIBCXX_VISIBILITY(default)
 {

libstdc++-v3/include/bits/uniform_int_dist.h

@@ -36,6 +36,7 @@
 #if __cplusplus > 201703L
 # include <concepts>
 #endif
+#include <bits/concept_check.h> // __glibcxx_function_requires
 
 namespace std _GLIBCXX_VISIBILITY(default)
 {

libstdc++-v3/include/bits/unique_lock.h

@@ -38,6 +38,7 @@
 
 #include <chrono>
 #include <bits/move.h> // for std::swap
+#include <bits/std_mutex.h> // for std::defer_lock_t
 
 namespace std _GLIBCXX_VISIBILITY(default)
 {

libstdc++-v3/include/debug/assertions.h

@@ -29,6 +29,8 @@
 #ifndef _GLIBCXX_DEBUG_ASSERTIONS_H
 #define _GLIBCXX_DEBUG_ASSERTIONS_H 1
 
+#include <bits/c++config.h>
+
 #ifndef _GLIBCXX_DEBUG
 
 # define _GLIBCXX_DEBUG_ASSERT(_Condition)