libstdc++: Mark headers that must be hosted as such [PR103626]

PR libstdc++/103626 - _GLIBCXX_HOSTED should respect -ffreestanding

Co-authored-by: Jonathan Wakely <jwakely@redhat.com>

libstdc++-v3/ChangeLog:

	PR libstdc++/103626
	* include/Makefile.am: Add new header.
	* include/Makefile.in: Regenerate.
	* include/bits/requires_hosted.h: New header.
	* include/experimental/algorithm: Include
	<bits/requires_hosted.h>.
	* include/experimental/any: Likewise.
	* include/experimental/array: Likewise.
	* include/experimental/buffer: Likewise.
	* include/experimental/chrono: Likewise.
	* include/experimental/deque: Likewise.
	* include/experimental/executor: Likewise.
	* include/experimental/filesystem: Likewise.
	* include/experimental/forward_list: Likewise.
	* include/experimental/functional: Likewise.
	* include/experimental/internet: Likewise.
	* include/experimental/io_context: Likewise.
	* include/experimental/iterator: Likewise.
	* include/experimental/list: Likewise.
	* include/experimental/map: Likewise.
	* include/experimental/memory: Likewise.
	* include/experimental/memory_resource: Likewise.
	* include/experimental/net: Likewise.
	* include/experimental/netfwd: Likewise.
	* include/experimental/numeric: Likewise.
	* include/experimental/optional: Likewise.
	* include/experimental/propagate_const: Likewise.
	* include/experimental/random: Likewise.
	* include/experimental/ratio: Likewise.
	* include/experimental/regex: Likewise.
	* include/experimental/scope: Likewise.
	* include/experimental/set: Likewise.
	* include/experimental/simd: Likewise.
	* include/experimental/socket: Likewise.
	* include/experimental/source_location: Likewise.
	* include/experimental/string: Likewise.
	* include/experimental/string_view: Likewise.
	* include/experimental/system_error: Likewise.
	* include/experimental/timer: Likewise.
	* include/experimental/tuple: Likewise.
	* include/experimental/unordered_map: Likewise.
	* include/experimental/unordered_set: Likewise.
	* include/experimental/utility: Likewise.
	* include/experimental/vector: Likewise.
	* include/std/barrier: Likewise.
	* include/std/chrono: Likewise.
	* include/std/condition_variable: Likewise.
	* include/std/deque: Likewise.
	* include/std/execution: Likewise.
	* include/std/filesystem: Likewise.
	* include/std/forward_list: Likewise.
	* include/std/fstream: Likewise.
	* include/std/future: Likewise.
	* include/std/iomanip: Likewise.
	* include/std/ios: Likewise.
	* include/std/iosfwd: Likewise.
	* include/std/iostream: Likewise.
	* include/std/istream: Likewise.
	* include/std/latch: Likewise.
	* include/std/list: Likewise.
	* include/std/locale: Likewise.
	* include/std/map: Likewise.
	* include/std/memory_resource: Likewise.
	* include/std/mutex: Likewise.
	* include/std/ostream: Likewise.
	* include/std/queue: Likewise.
	* include/std/random: Likewise.
	* include/std/regex: Likewise.
	* include/std/semaphore: Likewise.
	* include/std/set: Likewise.
	* include/std/shared_mutex: Likewise.
	* include/std/spanstream: Likewise.
	* include/std/sstream: Likewise.
	* include/std/stack: Likewise.
	* include/std/stacktrace: Likewise.
	* include/std/stop_token: Likewise.
	* include/std/streambuf: Likewise.
	* include/std/string: Likewise.
	* include/std/syncstream: Likewise.
	* include/std/system_error: Likewise.
	* include/std/thread: Likewise.
	* include/std/unordered_map: Likewise.
	* include/std/unordered_set: Likewise.
	* include/std/valarray: Likewise.
	* include/std/vector: Likewise.
	* include/tr1/array: Likewise.
	* include/tr1/ccomplex: Likewise.
	* include/tr1/cctype: Likewise.
	* include/tr1/cfenv: Likewise.
	* include/tr1/cfloat: Likewise.
	* include/tr1/cinttypes: Likewise.
	* include/tr1/climits: Likewise.
	* include/tr1/cmath: Likewise.
	* include/tr1/complex: Likewise.
	* include/tr1/complex.h: Likewise.
	* include/tr1/cstdarg: Likewise.
	* include/tr1/cstdbool: Likewise.
	* include/tr1/cstdint: Likewise.
	* include/tr1/cstdio: Likewise.
	* include/tr1/cstdlib: Likewise.
	* include/tr1/ctgmath: Likewise.
	* include/tr1/ctime: Likewise.
	* include/tr1/ctype.h: Likewise.
	* include/tr1/cwchar: Likewise.
	* include/tr1/cwctype: Likewise.
	* include/tr1/fenv.h: Likewise.
	* include/tr1/float.h: Likewise.
	* include/tr1/functional: Likewise.
	* include/tr1/inttypes.h: Likewise.
	* include/tr1/limits.h: Likewise.
	* include/tr1/math.h: Likewise.
	* include/tr1/memory: Likewise.
	* include/tr1/random: Likewise.
	* include/tr1/regex: Likewise.
	* include/tr1/stdarg.h: Likewise.
	* include/tr1/stdbool.h: Likewise.
	* include/tr1/stdint.h: Likewise.
	* include/tr1/stdio.h: Likewise.
	* include/tr1/stdlib.h: Likewise.
	* include/tr1/tgmath.h: Likewise.
	* include/tr1/tuple: Likewise.
	* include/tr1/type_traits: Likewise.
	* include/tr1/unordered_map: Likewise.
	* include/tr1/unordered_set: Likewise.
	* include/tr1/utility: Likewise.
	* include/tr1/wchar.h: Likewise.
	* include/tr1/wctype.h: Likewise.
	* include/c_global/cmath: Likewise.
	* include/ext/algorithm: Include <bits/requires_hosted.h>.
	* include/ext/bitmap_allocator.h: Likewise.
	* include/ext/cmath: Likewise.
	* include/ext/codecvt_specializations.h: Likewise.
	* include/ext/debug_allocator.h: Likewise.
	* include/ext/enc_filebuf.h: Likewise.
	* include/ext/extptr_allocator.h: Likewise.
	* include/ext/functional: Likewise.
	* include/ext/malloc_allocator.h: Likewise.
	* include/ext/memory: Likewise.
	* include/ext/mt_allocator.h: Likewise.
	* include/ext/new_allocator.h: Likewise.
	* include/ext/numeric: Likewise.
	* include/ext/pod_char_traits.h: Likewise.
	* include/ext/pool_allocator.h: Likewise.
	* include/ext/random: Likewise.
	* include/ext/random.tcc: Likewise.
	* include/ext/rb_tree: Likewise.
	* include/ext/rc_string_base.h: Likewise.
	* include/ext/rope: Likewise.
	* include/ext/ropeimpl.h: Likewise.
	* include/ext/slist: Likewise.
	* include/ext/sso_string_base.h: Likewise.
	* include/ext/stdio_filebuf.h: Likewise.
	* include/ext/stdio_sync_filebuf.h: Likewise.
	* include/ext/string_conversions.h: Likewise.
	* include/ext/throw_allocator.h: Likewise.
	* include/ext/vstring.h: Likewise.
	* include/ext/vstring.tcc: Likewise.
	* include/ext/vstring_fwd.h: Likewise.
	* include/ext/vstring_util.h: Likewise.
	* include/std/charconv: Likewise.
	(__cpp_lib_to_chars): Do not define for freestanding.
	* include/std/version: Adjust which macros get defined in
	freestanding.
	* include/ext/pointer.h [!_GLIBCXX_HOSTED]: Omit iostream
	functionality from freestanding.
	* include/std/algorithm [!_GLIBCXX_HOSTED]: Omit PSTL algos.
	* include/std/memory [!_GLIBCXX_HOSTED]: Omit
	<bits/stl_tempbuf.h> in freestanding
	* include/bits/algorithmfwd.h [!_GLIBCXX_HOSTED]: Omit leftover
	random_shuffle and stable_partition definition.
	* include/bits/stl_algo.h [!_GLIBCXX_HOSTED]: Omit
	random_shuffle and stable_partition from freestanding.
	* include/bits/ranges_algo.h [!_GLIBCXX_HOSTED]: Omit
	stable_partition from freestanding.
	* include/bits/concept_check.h: Remove needless HOSTED check.
	* include/std/iterator: Include <bits/ranges_base.h>.
	* include/std/numeric (__cpp_lib_parallel_algorithms): Do not
	define for freestanding.
	* include/std/functional (__cpp_lib_boyer_moore_searcher):
	Likewise.
	* testsuite/lib/prune.exp: Match error for hosted-only libstdc++
	tests.

42 files changed, 84 insertions, 0 deletions

diff --git a/libstdc++-v3/include/tr1/array b/libstdc++-v3/include/tr1/array
index 2aac0ed..f03ad81 100644
--- a/libstdc++-v3/include/tr1/array
+++ b/libstdc++-v3/include/tr1/array
@@ -31,6 +31,8 @@
 
 #pragma GCC system_header
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <bits/stl_algobase.h>
 
 namespace std _GLIBCXX_VISIBILITY(default)
diff --git a/libstdc++-v3/include/tr1/ccomplex b/libstdc++-v3/include/tr1/ccomplex
index 8f9546e..1b632be 100644
--- a/libstdc++-v3/include/tr1/ccomplex
+++ b/libstdc++-v3/include/tr1/ccomplex
@@ -29,6 +29,8 @@
 #ifndef _GLIBCXX_TR1_CCOMPLEX
 #define _GLIBCXX_TR1_CCOMPLEX 1
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <tr1/complex>
 
 #endif // _GLIBCXX_TR1_CCOMPLEX
diff --git a/libstdc++-v3/include/tr1/cctype b/libstdc++-v3/include/tr1/cctype
index 43520c7..2c4a15b 100644
--- a/libstdc++-v3/include/tr1/cctype
+++ b/libstdc++-v3/include/tr1/cctype
@@ -29,6 +29,8 @@
 #ifndef _GLIBCXX_TR1_CCTYPE
 #define _GLIBCXX_TR1_CCTYPE 1
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <bits/c++config.h>
 #include <cctype>
 
diff --git a/libstdc++-v3/include/tr1/cfenv b/libstdc++-v3/include/tr1/cfenv
index 202fe27..37e06c6 100644
--- a/libstdc++-v3/include/tr1/cfenv
+++ b/libstdc++-v3/include/tr1/cfenv
@@ -31,6 +31,8 @@
 
 #pragma GCC system_header
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <bits/c++config.h>
 
 #if _GLIBCXX_HAVE_FENV_H
diff --git a/libstdc++-v3/include/tr1/cfloat b/libstdc++-v3/include/tr1/cfloat
index 2456513..76bfcfb 100644
--- a/libstdc++-v3/include/tr1/cfloat
+++ b/libstdc++-v3/include/tr1/cfloat
@@ -29,6 +29,8 @@
 #ifndef _GLIBCXX_TR1_CFLOAT
 #define _GLIBCXX_TR1_CFLOAT 1
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <cfloat>
 
 #ifndef DECIMAL_DIG
diff --git a/libstdc++-v3/include/tr1/cinttypes b/libstdc++-v3/include/tr1/cinttypes
index a04cf24..24b4648 100644
--- a/libstdc++-v3/include/tr1/cinttypes
+++ b/libstdc++-v3/include/tr1/cinttypes
@@ -31,6 +31,8 @@
 
 #pragma GCC system_header
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <tr1/cstdint>
 
 // For 8.11.1/1 (see C99, Note 184)
diff --git a/libstdc++-v3/include/tr1/climits b/libstdc++-v3/include/tr1/climits
index 95e3bc3..0d702dc 100644
--- a/libstdc++-v3/include/tr1/climits
+++ b/libstdc++-v3/include/tr1/climits
@@ -29,6 +29,8 @@
 #ifndef _GLIBCXX_TR1_CLIMITS
 #define _GLIBCXX_TR1_CLIMITS 1
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <climits>
 
 #ifndef LLONG_MIN
diff --git a/libstdc++-v3/include/tr1/cmath b/libstdc++-v3/include/tr1/cmath
index f3a53f3..384f116 100644
--- a/libstdc++-v3/include/tr1/cmath
+++ b/libstdc++-v3/include/tr1/cmath
@@ -31,6 +31,8 @@
 
 #pragma GCC system_header
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <cmath>
 
 #ifdef _GLIBCXX_USE_C99_MATH_TR1
diff --git a/libstdc++-v3/include/tr1/complex b/libstdc++-v3/include/tr1/complex
index abb5e13..fa88cd5 100644
--- a/libstdc++-v3/include/tr1/complex
+++ b/libstdc++-v3/include/tr1/complex
@@ -31,6 +31,8 @@
 
 #pragma GCC system_header
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <complex>
 
 namespace std _GLIBCXX_VISIBILITY(default)
diff --git a/libstdc++-v3/include/tr1/complex.h b/libstdc++-v3/include/tr1/complex.h
index f282478..c5fb4c1 100644
--- a/libstdc++-v3/include/tr1/complex.h
+++ b/libstdc++-v3/include/tr1/complex.h
@@ -29,6 +29,8 @@
 #ifndef _GLIBCXX_TR1_COMPLEX_H
 #define _GLIBCXX_TR1_COMPLEX_H 1
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <tr1/ccomplex>
 
 #endif // _GLIBCXX_TR1_COMPLEX_H
diff --git a/libstdc++-v3/include/tr1/cstdarg b/libstdc++-v3/include/tr1/cstdarg
index f28ff2a..f046e816 100644
--- a/libstdc++-v3/include/tr1/cstdarg
+++ b/libstdc++-v3/include/tr1/cstdarg
@@ -29,6 +29,8 @@
 #ifndef _GLIBCXX_TR1_CSTDARG
 #define _GLIBCXX_TR1_CSTDARG 1
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <cstdarg>
 
 #endif // _GLIBCXX_TR1_CSTDARG
diff --git a/libstdc++-v3/include/tr1/cstdbool b/libstdc++-v3/include/tr1/cstdbool
index 77c0315..20afb63 100644
--- a/libstdc++-v3/include/tr1/cstdbool
+++ b/libstdc++-v3/include/tr1/cstdbool
@@ -31,6 +31,8 @@
 
 #pragma GCC system_header
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <bits/c++config.h>
 
 #if _GLIBCXX_HAVE_STDBOOL_H
diff --git a/libstdc++-v3/include/tr1/cstdint b/libstdc++-v3/include/tr1/cstdint
index 0d13b30..9e3e45c 100644
--- a/libstdc++-v3/include/tr1/cstdint
+++ b/libstdc++-v3/include/tr1/cstdint
@@ -31,6 +31,8 @@
 
 #pragma GCC system_header
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <bits/c++config.h>
 
 // For 8.22.1/1 (see C99, Notes 219, 220, 222)
diff --git a/libstdc++-v3/include/tr1/cstdio b/libstdc++-v3/include/tr1/cstdio
index 4692d21..dcbff6a 100644
--- a/libstdc++-v3/include/tr1/cstdio
+++ b/libstdc++-v3/include/tr1/cstdio
@@ -31,6 +31,8 @@
 
 #pragma GCC system_header
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <cstdio>
 
 #if _GLIBCXX_USE_C99_STDIO
diff --git a/libstdc++-v3/include/tr1/cstdlib b/libstdc++-v3/include/tr1/cstdlib
index de952bb..5569b0d 100644
--- a/libstdc++-v3/include/tr1/cstdlib
+++ b/libstdc++-v3/include/tr1/cstdlib
@@ -31,6 +31,8 @@
 
 #pragma GCC system_header
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <cstdlib>
 
 #if _GLIBCXX_HOSTED
diff --git a/libstdc++-v3/include/tr1/ctgmath b/libstdc++-v3/include/tr1/ctgmath
index 64ef405..15ada9c 100644
--- a/libstdc++-v3/include/tr1/ctgmath
+++ b/libstdc++-v3/include/tr1/ctgmath
@@ -29,6 +29,8 @@
 #ifndef _GLIBCXX_TR1_CTGMATH
 #define _GLIBCXX_TR1_CTGMATH 1
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <tr1/cmath>
 
 #endif // _GLIBCXX_TR1_CTGMATH
diff --git a/libstdc++-v3/include/tr1/ctime b/libstdc++-v3/include/tr1/ctime
index 8b9b869..99b529a 100644
--- a/libstdc++-v3/include/tr1/ctime
+++ b/libstdc++-v3/include/tr1/ctime
@@ -29,6 +29,8 @@
 #ifndef _GLIBCXX_TR1_CTIME
 #define _GLIBCXX_TR1_CTIME 1
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <ctime>
 
 #endif // _GLIBCXX_TR1_CTIME
diff --git a/libstdc++-v3/include/tr1/ctype.h b/libstdc++-v3/include/tr1/ctype.h
index 91177ff..014fc2b 100644
--- a/libstdc++-v3/include/tr1/ctype.h
+++ b/libstdc++-v3/include/tr1/ctype.h
@@ -29,6 +29,8 @@
 #ifndef _TR1_CTYPE_H
 #define _TR1_CTYPE_H 1
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <tr1/cctype>
 
 #endif
diff --git a/libstdc++-v3/include/tr1/cwchar b/libstdc++-v3/include/tr1/cwchar
index 23219bc..1140eda 100644
--- a/libstdc++-v3/include/tr1/cwchar
+++ b/libstdc++-v3/include/tr1/cwchar
@@ -31,6 +31,8 @@
 
 #pragma GCC system_header
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <cwchar>
 
 #ifdef _GLIBCXX_USE_WCHAR_T
diff --git a/libstdc++-v3/include/tr1/cwctype b/libstdc++-v3/include/tr1/cwctype
index 1a71dd0..ddb25af 100644
--- a/libstdc++-v3/include/tr1/cwctype
+++ b/libstdc++-v3/include/tr1/cwctype
@@ -31,6 +31,8 @@
 
 #pragma GCC system_header
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <cwctype>
 
 #ifdef _GLIBCXX_USE_WCHAR_T
diff --git a/libstdc++-v3/include/tr1/fenv.h b/libstdc++-v3/include/tr1/fenv.h
index 091b0b8..2547f00 100644
--- a/libstdc++-v3/include/tr1/fenv.h
+++ b/libstdc++-v3/include/tr1/fenv.h
@@ -29,6 +29,8 @@
 #ifndef _TR1_FENV_H
 #define _TR1_FENV_H 1
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <tr1/cfenv>
 
 #endif
diff --git a/libstdc++-v3/include/tr1/float.h b/libstdc++-v3/include/tr1/float.h
index 2367078..1dd3ef13 100644
--- a/libstdc++-v3/include/tr1/float.h
+++ b/libstdc++-v3/include/tr1/float.h
@@ -29,6 +29,8 @@
 #ifndef _TR1_FLOAT_H
 #define _TR1_FLOAT_H 1
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <tr1/cfloat>
 
 #endif
diff --git a/libstdc++-v3/include/tr1/functional b/libstdc++-v3/include/tr1/functional
index 83d22be..ae219ab 100644
--- a/libstdc++-v3/include/tr1/functional
+++ b/libstdc++-v3/include/tr1/functional
@@ -31,6 +31,8 @@
 
 #pragma GCC system_header
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <functional> // for std::_Placeholder, std::_Bind, std::_Bind_result
 
 #include <typeinfo>
diff --git a/libstdc++-v3/include/tr1/inttypes.h b/libstdc++-v3/include/tr1/inttypes.h
index 22a7514..eb5ddbe 100644
--- a/libstdc++-v3/include/tr1/inttypes.h
+++ b/libstdc++-v3/include/tr1/inttypes.h
@@ -29,6 +29,8 @@
 #ifndef _GLIBCXX_TR1_INTTYPES_H
 #define _GLIBCXX_TR1_INTTYPES_H 1
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <tr1/cinttypes>
 
 #endif // _GLIBCXX_TR1_INTTYPES_H
diff --git a/libstdc++-v3/include/tr1/limits.h b/libstdc++-v3/include/tr1/limits.h
index b54f9d2..73baf85 100644
--- a/libstdc++-v3/include/tr1/limits.h
+++ b/libstdc++-v3/include/tr1/limits.h
@@ -29,6 +29,8 @@
 #ifndef _TR1_LIMITS_H
 #define _TR1_LIMITS_H 1
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <tr1/climits>
 
 #endif
diff --git a/libstdc++-v3/include/tr1/math.h b/libstdc++-v3/include/tr1/math.h
index 423b5ea..99c8f45 100644
--- a/libstdc++-v3/include/tr1/math.h
+++ b/libstdc++-v3/include/tr1/math.h
@@ -29,6 +29,8 @@
 #ifndef _GLIBCXX_TR1_MATH_H
 #define _GLIBCXX_TR1_MATH_H 1
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <tr1/cmath>
 
 #if _GLIBCXX_USE_C99_MATH_TR1
diff --git a/libstdc++-v3/include/tr1/memory b/libstdc++-v3/include/tr1/memory
index b50a558..759000b 100644
--- a/libstdc++-v3/include/tr1/memory
+++ b/libstdc++-v3/include/tr1/memory
@@ -32,6 +32,8 @@
 
 #pragma GCC system_header
 
+#include <bits/requires_hosted.h> // TR1
+
 #if defined(_GLIBCXX_INCLUDE_AS_CXX11)
 #  error TR1 header cannot be included from C++11 header
 #endif
diff --git a/libstdc++-v3/include/tr1/random b/libstdc++-v3/include/tr1/random
index cb57540..f9fbd4d 100644
--- a/libstdc++-v3/include/tr1/random
+++ b/libstdc++-v3/include/tr1/random
@@ -32,6 +32,8 @@
 
 #pragma GCC system_header
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <cmath>
 #include <cstdio>
 #include <cstdlib>
diff --git a/libstdc++-v3/include/tr1/regex b/libstdc++-v3/include/tr1/regex
index 10db372..bcdea9d 100644
--- a/libstdc++-v3/include/tr1/regex
+++ b/libstdc++-v3/include/tr1/regex
@@ -33,6 +33,8 @@
 
 #pragma GCC system_header
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <algorithm>
 #include <bitset>
 #include <iterator>
diff --git a/libstdc++-v3/include/tr1/stdarg.h b/libstdc++-v3/include/tr1/stdarg.h
index 446dda1..4622f33 100644
--- a/libstdc++-v3/include/tr1/stdarg.h
+++ b/libstdc++-v3/include/tr1/stdarg.h
@@ -29,6 +29,8 @@
 #ifndef _TR1_STDARG_H
 #define _TR1_STDARG_H 1
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <tr1/cstdarg>
 
 #endif
diff --git a/libstdc++-v3/include/tr1/stdbool.h b/libstdc++-v3/include/tr1/stdbool.h
index 76d0b72..368e891 100644
--- a/libstdc++-v3/include/tr1/stdbool.h
+++ b/libstdc++-v3/include/tr1/stdbool.h
@@ -29,6 +29,8 @@
 #ifndef _TR1_STDBOOL_H
 #define _TR1_STDBOOL_H 1
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <tr1/cstdbool>
 
 #endif
diff --git a/libstdc++-v3/include/tr1/stdint.h b/libstdc++-v3/include/tr1/stdint.h
index 59c1d95..b19361b 100644
--- a/libstdc++-v3/include/tr1/stdint.h
+++ b/libstdc++-v3/include/tr1/stdint.h
@@ -29,6 +29,8 @@
 #ifndef _TR1_STDINT_H
 #define _TR1_STDINT_H 1
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <tr1/cstdint>
 
 #endif
diff --git a/libstdc++-v3/include/tr1/stdio.h b/libstdc++-v3/include/tr1/stdio.h
index f7cc5c7..3ef65f9 100644
--- a/libstdc++-v3/include/tr1/stdio.h
+++ b/libstdc++-v3/include/tr1/stdio.h
@@ -29,6 +29,8 @@
 #ifndef _TR1_STDIO_H
 #define _TR1_STDIO_H 1
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <tr1/cstdio>
 
 #endif
diff --git a/libstdc++-v3/include/tr1/stdlib.h b/libstdc++-v3/include/tr1/stdlib.h
index 0e9c605..0963136 100644
--- a/libstdc++-v3/include/tr1/stdlib.h
+++ b/libstdc++-v3/include/tr1/stdlib.h
@@ -29,6 +29,8 @@
 #ifndef _GLIBCXX_TR1_STDLIB_H
 #define _GLIBCXX_TR1_STDLIB_H 1
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <tr1/cstdlib>
 
 #if _GLIBCXX_HOSTED
diff --git a/libstdc++-v3/include/tr1/tgmath.h b/libstdc++-v3/include/tr1/tgmath.h
index 3871c3c..a3505c9 100644
--- a/libstdc++-v3/include/tr1/tgmath.h
+++ b/libstdc++-v3/include/tr1/tgmath.h
@@ -29,6 +29,8 @@
 #ifndef _GLIBCXX_TR1_TGMATH_H
 #define _GLIBCXX_TR1_TGMATH_H 1
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <tr1/ctgmath>
 
 #endif // _GLIBCXX_TR1_TGMATH_H
diff --git a/libstdc++-v3/include/tr1/tuple b/libstdc++-v3/include/tr1/tuple
index 94b1c0d..a24da25 100644
--- a/libstdc++-v3/include/tr1/tuple
+++ b/libstdc++-v3/include/tr1/tuple
@@ -34,6 +34,8 @@
 
 #pragma GCC system_header
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <utility>
 
 namespace std _GLIBCXX_VISIBILITY(default)
diff --git a/libstdc++-v3/include/tr1/type_traits b/libstdc++-v3/include/tr1/type_traits
index 2ee3b06..305a0d0 100644
--- a/libstdc++-v3/include/tr1/type_traits
+++ b/libstdc++-v3/include/tr1/type_traits
@@ -31,6 +31,8 @@
 
 #pragma GCC system_header
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <bits/c++config.h>
 
 namespace std _GLIBCXX_VISIBILITY(default)
diff --git a/libstdc++-v3/include/tr1/unordered_map b/libstdc++-v3/include/tr1/unordered_map
index edec4e2..24d3892 100644
--- a/libstdc++-v3/include/tr1/unordered_map
+++ b/libstdc++-v3/include/tr1/unordered_map
@@ -31,6 +31,8 @@
 
 #pragma GCC system_header
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <utility>
 #include <bits/stl_algobase.h>
 #include <bits/allocator.h>
diff --git a/libstdc++-v3/include/tr1/unordered_set b/libstdc++-v3/include/tr1/unordered_set
index fa11b16..59f0ab9 100644
--- a/libstdc++-v3/include/tr1/unordered_set
+++ b/libstdc++-v3/include/tr1/unordered_set
@@ -31,6 +31,8 @@
 
 #pragma GCC system_header
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <utility>
 #include <bits/stl_algobase.h>
 #include <bits/allocator.h>
diff --git a/libstdc++-v3/include/tr1/utility b/libstdc++-v3/include/tr1/utility
index e6e3bbd..cc2699d 100644
--- a/libstdc++-v3/include/tr1/utility
+++ b/libstdc++-v3/include/tr1/utility
@@ -31,6 +31,8 @@
 
 #pragma GCC system_header
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <bits/c++config.h>
 #include <bits/stl_relops.h>
 #include <bits/stl_pair.h>
diff --git a/libstdc++-v3/include/tr1/wchar.h b/libstdc++-v3/include/tr1/wchar.h
index 503ca20..0812c07 100644
--- a/libstdc++-v3/include/tr1/wchar.h
+++ b/libstdc++-v3/include/tr1/wchar.h
@@ -29,6 +29,8 @@
 #ifndef _GLIBCXX_TR1_WCHAR_H
 #define _GLIBCXX_TR1_WCHAR_H 1
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <tr1/cwchar>
 
 #endif // _GLIBCXX_TR1_WCHAR_H
diff --git a/libstdc++-v3/include/tr1/wctype.h b/libstdc++-v3/include/tr1/wctype.h
index fa0e458..84fd7cc 100644
--- a/libstdc++-v3/include/tr1/wctype.h
+++ b/libstdc++-v3/include/tr1/wctype.h
@@ -29,6 +29,8 @@
 #ifndef _GLIBCXX_TR1_WCTYPE_H
 #define _GLIBCXX_TR1_WCTYPE_H 1
 
+#include <bits/requires_hosted.h> // TR1
+
 #include <tr1/cwctype>
 
 #endif // _GLIBCXX_TR1_WCTYPE_H