This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rGbb939931a1ad: [libc++] Always build c++experimental.a 
(authored by ldionne).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D128927/new/

https://reviews.llvm.org/D128927

Files:
  clang/cmake/caches/Fuchsia-stage2.cmake
  clang/cmake/caches/Fuchsia.cmake
  compiler-rt/cmake/Modules/AddCompilerRT.cmake
  libcxx/CMakeLists.txt
  libcxx/appveyor.yml
  libcxx/cmake/caches/AIX.cmake
  libcxx/cmake/caches/Apple.cmake
  libcxx/cmake/caches/Generic-no-experimental.cmake
  libcxx/docs/BuildingLibcxx.rst
  libcxx/docs/UsingLibcxx.rst
  libcxx/src/CMakeLists.txt
  libcxx/test/CMakeLists.txt
  
libcxx/test/libcxx/experimental/memory/memory.resource.global/global_memory_resource_lifetime.pass.cpp
  
libcxx/test/libcxx/experimental/memory/memory.resource.global/new_delete_resource_lifetime.pass.cpp
  
libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/default.pass.cpp
  
libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/equal.pass.cpp
  
libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/not_equal.pass.cpp
  
libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/allocate.pass.cpp
  
libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair.pass.cpp
  
libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp
  
libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_rvalue.pass.cpp
  
libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_values.pass.cpp
  
libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair.pass.cpp
  
libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair_evil.pass.cpp
  
libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_types.pass.cpp
  
libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/deallocate.pass.cpp
  
libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/destroy.pass.cpp
  
libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/resource.pass.cpp
  
libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/select_on_container_copy_construction.pass.cpp
  
libcxx/test/std/experimental/memory/memory.resource.aliases/header_deque_synop.pass.cpp
  
libcxx/test/std/experimental/memory/memory.resource.aliases/header_forward_list_synop.pass.cpp
  
libcxx/test/std/experimental/memory/memory.resource.aliases/header_list_synop.pass.cpp
  
libcxx/test/std/experimental/memory/memory.resource.aliases/header_map_synop.pass.cpp
  
libcxx/test/std/experimental/memory/memory.resource.aliases/header_regex_synop.pass.cpp
  
libcxx/test/std/experimental/memory/memory.resource.aliases/header_set_synop.pass.cpp
  
libcxx/test/std/experimental/memory/memory.resource.aliases/header_string_synop.pass.cpp
  
libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_map_synop.pass.cpp
  
libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_set_synop.pass.cpp
  
libcxx/test/std/experimental/memory/memory.resource.aliases/header_vector_synop.pass.cpp
  
libcxx/test/std/experimental/memory/memory.resource.global/default_resource.pass.cpp
  
libcxx/test/std/experimental/memory/memory.resource.global/new_delete_resource.pass.cpp
  
libcxx/test/std/experimental/memory/memory.resource.global/null_memory_resource.pass.cpp
  libcxx/utils/ci/run-buildbot
  libcxx/utils/libcxx/test/params.py

Index: libcxx/utils/libcxx/test/params.py
===================================================================
--- libcxx/utils/libcxx/test/params.py
+++ libcxx/utils/libcxx/test/params.py
@@ -156,15 +156,19 @@
             ])),
 
   Parameter(name='enable_experimental', choices=[True, False], type=bool, default=True,
-            help="Whether to enable tests for experimental C++ libraries (typically Library Fundamentals TSes).",
+            help="Whether to enable tests for experimental C++ Library features.",
             actions=lambda experimental: [] if not experimental else [
-              AddFeature('c++experimental'),
               # When linking in MSVC mode via the Clang driver, a -l<foo>
               # maps to <foo>.lib, so we need to use -llibc++experimental here
               # to make it link against the static libc++experimental.lib.
               # We can't check for the feature 'msvc' in available_features
               # as those features are added after processing parameters.
-              PrependLinkFlag(lambda config: '-llibc++experimental' if _isMSVC(config) else '-lc++experimental')
+              #
+              # TODO: Switch to using the appropriate experimental compiler flag once
+              #       all compilers we support implement that flag.
+              AddFeature('c++experimental'),
+              PrependLinkFlag(lambda cfg: '-llibc++experimental' if _isMSVC(cfg) else '-lc++experimental'),
+              AddCompileFlag('-D_LIBCPP_ENABLE_EXPERIMENTAL'),
             ]),
 
   Parameter(name='long_tests', choices=[True, False], type=bool, default=True,
Index: libcxx/utils/ci/run-buildbot
===================================================================
--- libcxx/utils/ci/run-buildbot
+++ libcxx/utils/ci/run-buildbot
@@ -105,7 +105,6 @@
     # -D_LIBCPP_HAS_NO_INT128 (both when building the library itself and
     # when building tests) to allow enabling filesystem for running tests,
     # even if it uses a non-permanent ABI.
-
     generate-cmake-base \
           -DLLVM_ENABLE_RUNTIMES="libcxx" \
           -DCMAKE_C_COMPILER=clang-cl \
@@ -523,7 +522,7 @@
     # correctly when libc++ visibility attributes indicate dllimport linkage
     # anyway), thus just disable the experimental library. Remove this
     # setting when cmake and the test driver does the right thing automatically.
-    generate-cmake-libcxx-win -DLIBCXX_ENABLE_EXPERIMENTAL_LIBRARY=OFF
+    generate-cmake-libcxx-win -DLIBCXX_TEST_PARAMS="enable_experimental=False"
     echo "+++ Running the libc++ tests"
     ${NINJA} -vC "${BUILD_DIR}" check-cxx
 ;;
Index: libcxx/test/std/experimental/memory/memory.resource.global/null_memory_resource.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.resource.global/null_memory_resource.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.resource.global/null_memory_resource.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/memory_resource>
 
 // memory_resource * null_memory_resource()
Index: libcxx/test/std/experimental/memory/memory.resource.global/new_delete_resource.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.resource.global/new_delete_resource.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.resource.global/new_delete_resource.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/memory_resource>
 
 // memory_resource * new_delete_resource()
Index: libcxx/test/std/experimental/memory/memory.resource.global/default_resource.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.resource.global/default_resource.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.resource.global/default_resource.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/memory_resource>
 
 //-----------------------------------------------------------------------------
Index: libcxx/test/std/experimental/memory/memory.resource.aliases/header_vector_synop.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.resource.aliases/header_vector_synop.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.resource.aliases/header_vector_synop.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/vector>
 
 // namespace std { namespace experimental { namespace pmr {
Index: libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_set_synop.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_set_synop.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_set_synop.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/unordered_set>
 
 // namespace std { namespace experimental { namespace pmr {
Index: libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_map_synop.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_map_synop.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_map_synop.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/unordered_map>
 
 // namespace std { namespace experimental { namespace pmr {
Index: libcxx/test/std/experimental/memory/memory.resource.aliases/header_string_synop.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.resource.aliases/header_string_synop.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.resource.aliases/header_string_synop.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/string>
 
 // namespace std { namespace experimental { namespace pmr {
Index: libcxx/test/std/experimental/memory/memory.resource.aliases/header_set_synop.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.resource.aliases/header_set_synop.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.resource.aliases/header_set_synop.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/set>
 
 // namespace std { namespace experimental { namespace pmr {
Index: libcxx/test/std/experimental/memory/memory.resource.aliases/header_regex_synop.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.resource.aliases/header_regex_synop.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.resource.aliases/header_regex_synop.pass.cpp
@@ -9,6 +9,11 @@
 // UNSUPPORTED: c++03
 // UNSUPPORTED: no-localization
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/regex>
 
 // namespace std { namespace experimental { namespace pmr {
Index: libcxx/test/std/experimental/memory/memory.resource.aliases/header_map_synop.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.resource.aliases/header_map_synop.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.resource.aliases/header_map_synop.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/map>
 
 // namespace std { namespace experimental { namespace pmr {
Index: libcxx/test/std/experimental/memory/memory.resource.aliases/header_list_synop.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.resource.aliases/header_list_synop.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.resource.aliases/header_list_synop.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/list>
 
 // namespace std { namespace experimental { namespace pmr {
Index: libcxx/test/std/experimental/memory/memory.resource.aliases/header_forward_list_synop.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.resource.aliases/header_forward_list_synop.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.resource.aliases/header_forward_list_synop.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/forward_list>
 
 // namespace std { namespace experimental { namespace pmr {
Index: libcxx/test/std/experimental/memory/memory.resource.aliases/header_deque_synop.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.resource.aliases/header_deque_synop.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.resource.aliases/header_deque_synop.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/deque>
 
 // namespace std { namespace experimental { namespace pmr {
Index: libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/select_on_container_copy_construction.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/select_on_container_copy_construction.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/select_on_container_copy_construction.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/memory_resource>
 
 // template <class T> class polymorphic_allocator
Index: libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/resource.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/resource.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/resource.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/memory_resource>
 
 // template <class T> class polymorphic_allocator
Index: libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/destroy.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/destroy.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/destroy.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/memory_resource>
 
 // template <class T> class polymorphic_allocator
Index: libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/deallocate.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/deallocate.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/deallocate.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/memory_resource>
 
 // template <class T> class polymorphic_allocator
Index: libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_types.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_types.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_types.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/memory_resource>
 
 // template <class T> class polymorphic_allocator
Index: libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair_evil.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair_evil.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair_evil.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <memory_resource>
 
 // template <class T> class polymorphic_allocator
Index: libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/memory_resource>
 
 // template <class T> class polymorphic_allocator
Index: libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_values.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_values.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_values.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/memory_resource>
 
 // template <class T> class polymorphic_allocator
Index: libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_rvalue.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_rvalue.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_rvalue.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/memory_resource>
 
 // template <class T> class polymorphic_allocator
Index: libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/memory_resource>
 
 // template <class T> class polymorphic_allocator
Index: libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/memory_resource>
 
 // template <class T> class polymorphic_allocator
Index: libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/allocate.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/allocate.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/allocate.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/memory_resource>
 
 // template <class T> class polymorphic_allocator
Index: libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/not_equal.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/not_equal.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/not_equal.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/memory_resource>
 
 // template <class T> class polymorphic_allocator;
Index: libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/equal.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/equal.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/equal.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/memory_resource>
 
 // template <class T> class polymorphic_allocator;
Index: libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/default.pass.cpp
===================================================================
--- libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/default.pass.cpp
+++ libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/default.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/memory_resource>
 
 // template <class T> class polymorphic_allocator
Index: libcxx/test/libcxx/experimental/memory/memory.resource.global/new_delete_resource_lifetime.pass.cpp
===================================================================
--- libcxx/test/libcxx/experimental/memory/memory.resource.global/new_delete_resource_lifetime.pass.cpp
+++ libcxx/test/libcxx/experimental/memory/memory.resource.global/new_delete_resource_lifetime.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/memory_resource>
 
 // memory_resource * new_delete_resource()
Index: libcxx/test/libcxx/experimental/memory/memory.resource.global/global_memory_resource_lifetime.pass.cpp
===================================================================
--- libcxx/test/libcxx/experimental/memory/memory.resource.global/global_memory_resource_lifetime.pass.cpp
+++ libcxx/test/libcxx/experimental/memory/memory.resource.global/global_memory_resource_lifetime.pass.cpp
@@ -8,6 +8,11 @@
 
 // UNSUPPORTED: c++03
 
+// Aligned allocation is required by std::experimental::pmr, but it was not provided
+// before macosx10.13 and as a result we get linker errors when deploying to older than
+// macosx10.13.
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+
 // <experimental/memory_resource>
 
 // memory_resource * new_delete_resource()
Index: libcxx/test/CMakeLists.txt
===================================================================
--- libcxx/test/CMakeLists.txt
+++ libcxx/test/CMakeLists.txt
@@ -93,10 +93,6 @@
   serialize_lit_param(enable_exceptions False)
 endif()
 
-if (NOT LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY)
-  serialize_lit_param(enable_experimental False)
-endif()
-
 if (NOT LIBCXX_ENABLE_RTTI)
   serialize_lit_param(enable_rtti False)
 endif()
Index: libcxx/src/CMakeLists.txt
===================================================================
--- libcxx/src/CMakeLists.txt
+++ libcxx/src/CMakeLists.txt
@@ -315,31 +315,30 @@
 # Add a meta-target for both libraries.
 add_custom_target(cxx DEPENDS ${LIBCXX_BUILD_TARGETS})
 
-if (LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY)
-  set(LIBCXX_EXPERIMENTAL_SOURCES
-    experimental/memory_resource.cpp
-    )
-  add_library(cxx_experimental STATIC ${LIBCXX_EXPERIMENTAL_SOURCES})
-  if (LIBCXX_ENABLE_SHARED)
-    target_link_libraries(cxx_experimental PRIVATE cxx_shared)
-  else()
-    target_link_libraries(cxx_experimental PRIVATE cxx_static)
-  endif()
-
-  set_target_properties(cxx_experimental
-    PROPERTIES
-      COMPILE_FLAGS "${LIBCXX_COMPILE_FLAGS}"
-      OUTPUT_NAME   "c++experimental"
+set(LIBCXX_EXPERIMENTAL_SOURCES
+  experimental/memory_resource.cpp
   )
-  cxx_add_common_build_flags(cxx_experimental)
 
-  if (LIBCXX_HERMETIC_STATIC_LIBRARY)
-    # _LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS can be defined in __config_site
-    # too. Define it in the same way here, to avoid redefinition conflicts.
-    target_compile_definitions(cxx_experimental PRIVATE _LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS=)
-  endif()
+add_library(cxx_experimental STATIC ${LIBCXX_EXPERIMENTAL_SOURCES})
+if (LIBCXX_ENABLE_SHARED)
+  target_link_libraries(cxx_experimental PRIVATE cxx_shared)
+else()
+  target_link_libraries(cxx_experimental PRIVATE cxx_static)
 endif()
 
+if (LIBCXX_HERMETIC_STATIC_LIBRARY)
+  # _LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS can be defined in __config_site
+  # too. Define it in the same way here, to avoid redefinition conflicts.
+  target_compile_definitions(cxx_experimental PRIVATE _LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS=)
+endif()
+
+set_target_properties(cxx_experimental
+  PROPERTIES
+    COMPILE_FLAGS "${LIBCXX_COMPILE_FLAGS}"
+    OUTPUT_NAME   "c++experimental"
+)
+cxx_add_common_build_flags(cxx_experimental)
+
 
 if (LIBCXX_BUILD_EXTERNAL_THREAD_LIBRARY)
   set(LIBCXX_EXTERNAL_THREADING_SUPPORT_SOURCES
@@ -375,7 +374,7 @@
     RUNTIME DESTINATION ${LIBCXX_INSTALL_RUNTIME_DIR} COMPONENT cxx)
 endif()
 
-if(LIBCXX_INSTALL_EXPERIMENTAL_LIBRARY)
+if (LIBCXX_INSTALL_LIBRARY)
   install(TARGETS cxx_experimental
     LIBRARY DESTINATION ${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
     ARCHIVE DESTINATION ${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
@@ -392,10 +391,7 @@
 
 if (NOT CMAKE_CONFIGURATION_TYPES)
     if(LIBCXX_INSTALL_LIBRARY)
-      set(lib_install_target cxx)
-    endif()
-    if (LIBCXX_INSTALL_EXPERIMENTAL_LIBRARY)
-      set(experimental_lib_install_target cxx_experimental)
+      set(lib_install_target "cxx;cxx_experimental")
     endif()
     if(LIBCXX_INSTALL_HEADERS)
       set(header_install_target install-cxx-headers)
@@ -405,7 +401,7 @@
     endif()
     add_custom_target(install-cxx
                       DEPENDS ${lib_install_target}
-                              ${experimental_lib_install_target}
+                              cxx_experimental
                               ${header_install_target}
                               ${pstl_install_target}
                       COMMAND "${CMAKE_COMMAND}"
@@ -413,7 +409,7 @@
                       -P "${LIBCXX_BINARY_DIR}/cmake_install.cmake")
     add_custom_target(install-cxx-stripped
                       DEPENDS ${lib_install_target}
-                              ${experimental_lib_install_target}
+                              cxx_experimental
                               ${header_install_target}
                               ${pstl_install_target}
                       COMMAND "${CMAKE_COMMAND}"
Index: libcxx/docs/UsingLibcxx.rst
===================================================================
--- libcxx/docs/UsingLibcxx.rst
+++ libcxx/docs/UsingLibcxx.rst
@@ -34,22 +34,20 @@
   library until the standard has been ratified.
 
 
-Using libc++experimental and ``<experimental/...>``
-===================================================
+Enabling experimental C++ Library features
+==========================================
 
-Libc++ provides implementations of experimental technical specifications
-in a separate library, ``libc++experimental.a``. Users of ``<experimental/...>``
-headers may be required to link ``-lc++experimental``. Note that not all
-vendors ship ``libc++experimental.a``, and as a result, you may not be
-able to use those experimental features.
-
-.. code-block:: bash
-
-  $ clang++ test.cpp -lc++experimental
+Libc++ provides implementations of some experimental features. Experimental features
+are either Technical Specifications (TSes) or official features that were voted to
+the Standard but whose implementation is not complete or stable yet in libc++. Those
+are disabled by default because they are neither API nor ABI stable. However, the
+``_LIBCPP_ENABLE_EXPERIMENTAL`` macro can be defined to turn those features on. Note
+that you will also need to link to the appropriate ``libc++experimental.a`` static
+archive.
 
 .. warning::
   Experimental libraries are Experimental.
-    * The contents of the ``<experimental/...>`` headers and ``libc++experimental.a``
+    * The contents of the ``<experimental/...>`` headers and the associated static
       library will not remain compatible between versions.
     * No guarantees of API or ABI stability are provided.
     * When the standardized version of an experimental feature is implemented,
Index: libcxx/docs/BuildingLibcxx.rst
===================================================================
--- libcxx/docs/BuildingLibcxx.rst
+++ libcxx/docs/BuildingLibcxx.rst
@@ -99,8 +99,7 @@
           -T "ClangCL"                                    ^
           -DLLVM_ENABLE_RUNTIMES=libcxx                   ^
           -DLIBCXX_ENABLE_SHARED=YES                      ^
-          -DLIBCXX_ENABLE_STATIC=NO                       ^
-          -DLIBCXX_ENABLE_EXPERIMENTAL_LIBRARY=NO
+          -DLIBCXX_ENABLE_STATIC=NO
   > cmake --build build
 
 CMake + ninja (MSVC)
@@ -131,8 +130,7 @@
   > cmake -G Ninja -S runtimes -B build                                               ^
           -DCMAKE_C_COMPILER=clang-cl                                                 ^
           -DCMAKE_CXX_COMPILER=clang-cl                                               ^
-          -DLLVM_ENABLE_RUNTIMES=libcxx                                               ^
-          -DLIBCXX_ENABLE_EXPERIMENTAL_LIBRARY=NO
+          -DLLVM_ENABLE_RUNTIMES=libcxx
   > ninja -C build cxx
   > ninja -C build check-cxx
 
@@ -298,23 +296,6 @@
   Path where target-specific libc++ headers should be installed. If a relative
   path, relative to ``CMAKE_INSTALL_PREFIX``.
 
-.. _libc++experimental options:
-
-libc++experimental Specific Options
-------------------------------------
-
-.. option:: LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY:BOOL
-
-  **Default**: ``ON``
-
-  Build and test libc++experimental.a.
-
-.. option:: LIBCXX_INSTALL_EXPERIMENTAL_LIBRARY:BOOL
-
-  **Default**: ``LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY AND LIBCXX_INSTALL_LIBRARY``
-
-  Install libc++experimental.a alongside libc++.
-
 
 .. _ABI Library Specific Options:
 
Index: libcxx/cmake/caches/Generic-no-experimental.cmake
===================================================================
--- libcxx/cmake/caches/Generic-no-experimental.cmake
+++ libcxx/cmake/caches/Generic-no-experimental.cmake
@@ -1,2 +1,3 @@
-set(LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY OFF CACHE BOOL "")
+set(LIBCXX_TEST_PARAMS "enable_experimental=False" CACHE STRING "")
+set(LIBCXXABI_TEST_PARAMS "${LIBCXX_TEST_PARAMS}" CACHE STRING "")
 set(LIBCXX_ENABLE_INCOMPLETE_FEATURES OFF CACHE BOOL "")
Index: libcxx/cmake/caches/Apple.cmake
===================================================================
--- libcxx/cmake/caches/Apple.cmake
+++ libcxx/cmake/caches/Apple.cmake
@@ -4,7 +4,6 @@
 set(LIBCXX_USE_COMPILER_RT ON CACHE BOOL "")
 set(LIBCXX_ENABLE_ASSERTIONS OFF CACHE BOOL "")
 set(LIBCXX_ABI_VERSION "1" CACHE STRING "")
-set(LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY OFF CACHE BOOL "")
 set(LIBCXX_ENABLE_STATIC ON CACHE BOOL "")
 set(LIBCXX_ENABLE_SHARED ON CACHE BOOL "")
 set(LIBCXX_CXX_ABI libcxxabi CACHE STRING "")
Index: libcxx/cmake/caches/AIX.cmake
===================================================================
--- libcxx/cmake/caches/AIX.cmake
+++ libcxx/cmake/caches/AIX.cmake
@@ -9,7 +9,6 @@
 set(LIBCXX_ENABLE_ASSERTIONS OFF CACHE BOOL "")
 set(LIBCXX_ABI_VERSION "1" CACHE STRING "")
 set(LIBCXX_ENABLE_ABI_LINKER_SCRIPT OFF CACHE BOOL "")
-set(LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY OFF CACHE BOOL "")
 set(LIBCXX_ENABLE_SHARED ON CACHE BOOL "")
 set(LIBCXX_ENABLE_STATIC OFF CACHE BOOL "")
 set(LIBCXXABI_ENABLE_SHARED ON CACHE BOOL "")
Index: libcxx/appveyor.yml
===================================================================
--- libcxx/appveyor.yml
+++ libcxx/appveyor.yml
@@ -45,7 +45,7 @@
   #############################################################################
   - cmake -G "%GENERATOR%" %CMAKE_OPTIONS%
     "-DCMAKE_BUILD_TYPE=%configuration%"
-    "-DLLVM_PATH=C:\projects\deps\llvm" -DLIBCXX_ENABLE_EXPERIMENTAL_LIBRARY=OFF
+    "-DLLVM_PATH=C:\projects\deps\llvm"
     -DLLVM_LIT_ARGS="-sv --show-xfail --show-unsupported"
     %APPVEYOR_BUILD_FOLDER%
 
Index: libcxx/CMakeLists.txt
===================================================================
--- libcxx/CMakeLists.txt
+++ libcxx/CMakeLists.txt
@@ -55,7 +55,6 @@
    by users in their own code regardless of this option." OFF)
 option(LIBCXX_ENABLE_SHARED "Build libc++ as a shared library." ON)
 option(LIBCXX_ENABLE_STATIC "Build libc++ as a static library." ON)
-option(LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY "Build libc++experimental.a" ON)
 set(ENABLE_FILESYSTEM_DEFAULT ON)
 if (WIN32 AND NOT MINGW)
   # Filesystem is buildable for windows, but it requires __int128 helper
@@ -167,9 +166,6 @@
 cmake_dependent_option(LIBCXX_INSTALL_SHARED_LIBRARY
   "Install the shared libc++ library." ON
   "LIBCXX_ENABLE_SHARED;LIBCXX_INSTALL_LIBRARY" OFF)
-cmake_dependent_option(LIBCXX_INSTALL_EXPERIMENTAL_LIBRARY
-        "Install libc++experimental.a" ON
-        "LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY;LIBCXX_INSTALL_LIBRARY" OFF)
 
 option(LIBCXX_ABI_UNSTABLE "Use the unstable ABI of libc++. This is equivalent to specifying LIBCXX_ABI_VERSION=n, where n is the not-yet-stable version." OFF)
 if (LIBCXX_ABI_UNSTABLE)
@@ -930,11 +926,7 @@
 add_subdirectory(src)
 add_subdirectory(utils)
 
-set(LIBCXX_TEST_DEPS "")
-
-if (LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY)
-  list(APPEND LIBCXX_TEST_DEPS cxx_experimental)
-endif()
+set(LIBCXX_TEST_DEPS "cxx_experimental")
 
 if (LIBCXX_BUILD_EXTERNAL_THREAD_LIBRARY)
   list(APPEND LIBCXX_TEST_DEPS cxx_external_threads)
Index: compiler-rt/cmake/Modules/AddCompilerRT.cmake
===================================================================
--- compiler-rt/cmake/Modules/AddCompilerRT.cmake
+++ compiler-rt/cmake/Modules/AddCompilerRT.cmake
@@ -685,7 +685,6 @@
                -DLIBCXXABI_HERMETIC_STATIC_LIBRARY=ON
                -DLIBCXXABI_INCLUDE_TESTS=OFF
                -DLIBCXX_CXX_ABI=libcxxabi
-               -DLIBCXX_ENABLE_EXPERIMENTAL_LIBRARY=OFF
                -DLIBCXX_ENABLE_SHARED=OFF
                -DLIBCXX_HERMETIC_STATIC_LIBRARY=ON
                -DLIBCXX_INCLUDE_BENCHMARKS=OFF
Index: clang/cmake/caches/Fuchsia.cmake
===================================================================
--- clang/cmake/caches/Fuchsia.cmake
+++ clang/cmake/caches/Fuchsia.cmake
@@ -50,7 +50,6 @@
 
 if(WIN32)
   set(LIBCXX_ABI_VERSION 2 CACHE STRING "")
-  set(LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY OFF CACHE BOOL "")
   set(LIBCXX_ENABLE_FILESYSTEM OFF CACHE BOOL "")
   set(LIBCXX_ENABLE_ABI_LINKER_SCRIPT OFF CACHE BOOL "")
   set(LIBCXX_ENABLE_SHARED OFF CACHE BOOL "")
Index: clang/cmake/caches/Fuchsia-stage2.cmake
===================================================================
--- clang/cmake/caches/Fuchsia-stage2.cmake
+++ clang/cmake/caches/Fuchsia-stage2.cmake
@@ -79,7 +79,6 @@
   set(RUNTIMES_${target}_CMAKE_SYSTEM_NAME Windows CACHE STRING "")
   set(RUNTIMES_${target}_CMAKE_BUILD_TYPE RelWithDebInfo CACHE STRING "")
   set(RUNTIMES_${target}_LIBCXX_ABI_VERSION 2 CACHE STRING "")
-  set(RUNTIMES_${target}_LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY OFF CACHE BOOL "")
   set(RUNTIMES_${target}_LIBCXX_ENABLE_FILESYSTEM OFF CACHE BOOL "")
   set(RUNTIMES_${target}_LIBCXX_ENABLE_ABI_LINKER_SCRIPT OFF CACHE BOOL "")
   set(RUNTIMES_${target}_LIBCXX_ENABLE_SHARED OFF CACHE BOOL "")
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