[libc++] Remove transitive includes from empty headers (#116295)

This removes transitive includes that are only in a header that is empty
in a given C++ version.

Author: philnik777

libcxx/include/bit

@@ -87,10 +87,6 @@ namespace std {
 #  pragma GCC system_header
 #endif
 
-#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 17
-#  include <cstdint>
-#endif
-
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <cstdlib>
 #  include <iosfwd>

libcxx/include/charconv

@@ -101,13 +101,6 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 
 _LIBCPP_END_NAMESPACE_STD
 
-#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 14
-#  include <cerrno>
-#  include <cstddef>
-#  include <initializer_list>
-#  include <new>
-#endif
-
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <cmath>
 #  include <concepts>

libcxx/include/compare

@@ -164,12 +164,6 @@ namespace std {
 #  pragma GCC system_header
 #endif
 
-#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 17
-#  include <cstddef>
-#  include <cstdint>
-#  include <limits>
-#endif
-
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <cmath>
 #  include <cstddef>

libcxx/include/expected

@@ -53,10 +53,4 @@ namespace std {
 #  pragma GCC system_header
 #endif
 
-#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
-#  include <cstddef>
-#  include <initializer_list>
-#  include <new>
-#endif
-
 #endif // _LIBCPP_EXPECTED

libcxx/include/mdspan

@@ -426,13 +426,4 @@ namespace std {
 #  pragma GCC system_header
 #endif
 
-#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
-#  include <array>
-#  include <cinttypes>
-#  include <concepts>
-#  include <cstddef>
-#  include <limits>
-#  include <span>
-#endif
-
 #endif // _LIBCPP_MDSPAN

libcxx/include/memory_resource

@@ -66,15 +66,6 @@ namespace std::pmr {
 #  pragma GCC system_header
 #endif
 
-#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 14
-#  include <cstddef>
-#  include <cstdint>
-#  include <limits>
-#  include <mutex>
-#  include <new>
-#  include <tuple>
-#endif
-
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <stdexcept>
 #endif

libcxx/include/ranges

@@ -446,14 +446,6 @@ namespace std {
 #  pragma GCC system_header
 #endif
 
-#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 17
-#  include <cstddef>
-#  include <limits>
-#  include <optional>
-#  include <span>
-#  include <tuple>
-#endif
-
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <cstdlib>
 #  include <iosfwd>

libcxx/test/libcxx/transitive_includes/cxx03.csv

@@ -242,17 +242,14 @@ ccomplex utility
 ccomplex variant
 ccomplex vector
 ccomplex version
-charconv cerrno
 charconv cmath
 charconv concepts
 charconv cstddef
 charconv cstdint
 charconv cstdlib
 charconv cstring
-charconv initializer_list
 charconv iosfwd
 charconv limits
-charconv new
 charconv type_traits
 charconv version
 chrono algorithm
@@ -571,12 +568,6 @@ exception typeinfo
 exception version
 execution cstddef
 execution version
-expected cstddef
-expected cstdint
-expected cstdlib
-expected initializer_list
-expected new
-expected type_traits
 expected version
 experimental/iterator algorithm
 experimental/iterator atomic
@@ -1340,53 +1331,6 @@ map utility
 map variant
 map vector
 map version
-mdspan algorithm
-mdspan array
-mdspan atomic
-mdspan bit
-mdspan cctype
-mdspan cerrno
-mdspan cinttypes
-mdspan climits
-mdspan clocale
-mdspan cmath
-mdspan compare
-mdspan concepts
-mdspan cstdarg
-mdspan cstddef
-mdspan cstdint
-mdspan cstdio
-mdspan cstdlib
-mdspan cstring
-mdspan ctime
-mdspan cwchar
-mdspan cwctype
-mdspan exception
-mdspan functional
-mdspan initializer_list
-mdspan ios
-mdspan iosfwd
-mdspan iterator
-mdspan limits
-mdspan locale
-mdspan memory
-mdspan mutex
-mdspan new
-mdspan optional
-mdspan ratio
-mdspan span
-mdspan stdexcept
-mdspan streambuf
-mdspan string
-mdspan string_view
-mdspan system_error
-mdspan tuple
-mdspan type_traits
-mdspan typeinfo
-mdspan unordered_map
-mdspan utility
-mdspan variant
-mdspan vector
 mdspan version
 memory atomic
 memory cctype
@@ -1416,42 +1360,15 @@ memory typeinfo
 memory utility
 memory variant
 memory version
-memory_resource algorithm
-memory_resource atomic
-memory_resource bit
-memory_resource cctype
-memory_resource cerrno
-memory_resource climits
-memory_resource cmath
-memory_resource compare
-memory_resource concepts
 memory_resource cstddef
 memory_resource cstdint
-memory_resource cstdio
 memory_resource cstdlib
-memory_resource cstring
-memory_resource ctime
-memory_resource cwchar
-memory_resource cwctype
 memory_resource exception
-memory_resource initializer_list
 memory_resource iosfwd
-memory_resource iterator
-memory_resource limits
-memory_resource memory
-memory_resource mutex
 memory_resource new
-memory_resource optional
-memory_resource ratio
 memory_resource stdexcept
-memory_resource string
-memory_resource string_view
-memory_resource system_error
-memory_resource tuple
 memory_resource type_traits
 memory_resource typeinfo
-memory_resource utility
-memory_resource variant
 memory_resource version
 mutex algorithm
 mutex atomic
@@ -1772,52 +1689,28 @@ random utility
 random variant
 random vector
 random version
-ranges algorithm
-ranges array
-ranges atomic
-ranges bit
 ranges cctype
-ranges cerrno
-ranges climits
-ranges clocale
 ranges cmath
 ranges compare
 ranges concepts
-ranges cstdarg
 ranges cstddef
 ranges cstdint
 ranges cstdio
 ranges cstdlib
 ranges cstring
-ranges ctime
 ranges cwchar
 ranges cwctype
 ranges exception
-ranges functional
 ranges initializer_list
-ranges ios
 ranges iosfwd
 ranges iterator
 ranges limits
-ranges locale
-ranges memory
-ranges mutex
 ranges new
-ranges optional
-ranges ratio
-ranges span
-ranges stdexcept
-ranges streambuf
-ranges string
-ranges string_view
-ranges system_error
 ranges tuple
 ranges type_traits
 ranges typeinfo
-ranges unordered_map
 ranges utility
 ranges variant
-ranges vector
 ranges version
 ratio climits
 ratio cstdint