Revert "Remove external/libcxx in favor of prebuilt"

Revert submission 2675705-use-prebuilt-libcxx

Reason for revert: breaks some Android tests (b/337120479, b/337121737, b/337122511)

Reverted changes: /q/submissionid:2675705-use-prebuilt-libcxx

Bug: 337120479
Bug: 337121737
Bug: 337122511
Change-Id: Ie06cb6c61a08c5f2119231ac8eaad8f8069e620a
diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..2a7d484
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,317 @@
+//
+// Copyright (C) 2014 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// NOTE: This project is out of date. See http://b/175635923 for details. Until
+// that is resolved it is not possible for us to update or expand access to
+// std::filesystem.
+
+package {
+    default_applicable_licenses: ["external_libcxx_license"],
+}
+
+// Added automatically by a large-scale-change that took the approach of
+// 'apply every license found to every target'. While this makes sure we respect
+// every license restriction, it may not be entirely correct.
+//
+// e.g. GPL in an MIT project might only apply to the contrib/ directory.
+//
+// Please consider splitting the single license below into multiple licenses,
+// taking care not to lose any license_kind information, and overriding the
+// default license using the 'licenses: [...]' property on targets as needed.
+//
+// For unused files, consider creating a 'fileGroup' with "//visibility:private"
+// to attach the license to, and including a comment whether the files may be
+// used in the current project.
+// See: http://go/android-license-faq
+license {
+    name: "external_libcxx_license",
+    visibility: [":__subpackages__"],
+    license_kinds: [
+        "SPDX-license-identifier-Apache-2.0",
+        "SPDX-license-identifier-BSD",
+        "SPDX-license-identifier-MIT",
+        "SPDX-license-identifier-NCSA",
+    ],
+    license_text: [
+        "LICENSE.TXT",
+    ],
+}
+
+cc_defaults {
+    name: "libc++ defaults",
+    host_supported: true,
+    local_include_dirs: ["include"],
+    export_include_dirs: ["include"],
+    cflags: ["-Wall", "-Werror", "-Wno-unused-parameter"],
+    cppflags: [
+        "-std=c++14",
+        "-fexceptions",
+        "-DLIBCXX_BUILDING_LIBCXXABI",
+        "-D_LIBCPP_BUILDING_LIBRARY",
+    ],
+    rtti: true,
+    stl: "none",
+    target: {
+        linux_bionic: {
+            enabled: true,
+        },
+        windows: {
+            enabled: true,
+            cflags: [
+                "-D_LIBCPP_HAS_THREAD_API_WIN32",
+                "-D_LIBCXXABI_BUILDING_LIBRARY",
+                "-D_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS",
+                "-D_LIBCXXABI_DISABLE_VISIBILITY_ANNOTATIONS",
+                "-UWIN32_LEAN_AND_MEAN",
+            ],
+        },
+    },
+}
+
+// host + device static lib
+cc_library_static {
+    name: "libc++_static",
+    defaults: ["libc++ defaults"],
+    vendor_available: true,
+    product_available: true,
+    ramdisk_available: true,
+    vendor_ramdisk_available: true,
+    recovery_available: true,
+    apex_available: [
+        "//apex_available:platform",
+        "//apex_available:anyapex",
+    ],
+    // being part of updatable apexes, this should work on older releases
+    min_sdk_version: "apex_inherit",
+    // sdk_version normally isn't needed as only the platform variant
+    // is used, except on riscv64 which doesn't have an NDK libc++ and
+    // reuses this module for sdk variants.
+    sdk_version: "current",
+    native_bridge_supported: true,
+    srcs: [
+        "src/algorithm.cpp",
+        "src/any.cpp",
+        "src/bind.cpp",
+        "src/charconv.cpp",
+        "src/chrono.cpp",
+        "src/condition_variable.cpp",
+        "src/debug.cpp",
+        "src/exception.cpp",
+        "src/future.cpp",
+        "src/hash.cpp",
+        "src/ios.cpp",
+        "src/iostream.cpp",
+        "src/locale.cpp",
+        "src/memory.cpp",
+        "src/mutex.cpp",
+        "src/new.cpp",
+        "src/optional.cpp",
+        "src/random.cpp",
+        "src/regex.cpp",
+        "src/shared_mutex.cpp",
+        "src/stdexcept.cpp",
+        "src/string.cpp",
+        "src/strstream.cpp",
+        "src/system_error.cpp",
+        "src/thread.cpp",
+        "src/typeinfo.cpp",
+        "src/utility.cpp",
+        "src/valarray.cpp",
+        "src/variant.cpp",
+        "src/vector.cpp",
+    ],
+    whole_static_libs: [
+        "libc++abi",
+    ],
+    target: {
+        windows: {
+            srcs: [
+                "src/support/win32/*.cpp",
+            ]
+        },
+    },
+}
+
+// host + device dynamic lib
+cc_library_shared {
+    name: "libc++",
+    host_supported: true,
+    vendor_available: true,
+    product_available: true,
+    native_bridge_supported: true,
+    double_loadable: true,
+    ramdisk_available: true,
+    vendor_ramdisk_available: true,
+    recovery_available: true,
+    apex_available: [
+        "//apex_available:platform",
+        "//apex_available:anyapex",
+    ],
+    // being part of updatable apexes, this should work on older releases
+    min_sdk_version: "apex_inherit",
+    // sdk_version normally isn't needed as only the platform variant
+    // is used, except on riscv64 which doesn't have an NDK libc++ and
+    // reuses this module for sdk variants.
+    sdk_version: "current",
+    whole_static_libs: ["libc++_static"],
+    stl: "none",
+
+    afdo: true,
+
+    target: {
+        darwin: {
+            // TODO: LLD does not implement force_symbols_weak_list or
+            // force_symbols_not_weak_list. Opt out and keep using ld64.
+            use_clang_lld: false,
+            unexported_symbols_list: "lib/libc++unexp.exp",
+            force_symbols_not_weak_list: "lib/notweak.exp",
+            force_symbols_weak_list: "lib/weak.exp",
+            ldflags: [
+                "-Wl,-undefined,dynamic_lookup",
+            ],
+        },
+
+        linux_bionic: {
+            enabled: true,
+        },
+    },
+}
+
+cc_library_static {
+    name: "libc++experimental",
+    defaults: ["libc++ defaults"],
+    srcs: [
+        "src/experimental/memory_resource.cpp",
+    ],
+}
+
+// Not available to vendor modules until libc++ is updated and this library is
+// merged into libc++ proper.
+// Follow http://b/175635923 for progress.
+cc_library_static {
+    name: "libc++fs",
+    ramdisk_available: true,
+    recovery_available: true,
+    apex_available: [
+        "//apex_available:platform",
+        "com.android.art",
+        "com.android.art.debug",
+        "com.android.btservices",
+    ],
+    // being part of updatable apexes, this should work on older releases
+    min_sdk_version: "apex_inherit",
+    defaults: ["libc++ defaults"],
+    srcs: [
+        "src/filesystem/directory_iterator.cpp",
+        "src/filesystem/operations.cpp",
+    ],
+    multilib: {
+        lib32: {
+            // off_t usage is constrained to within the libc++ source (not the
+            // headers), so we can build the filesystem library with a 64-bit
+            // off_t on LP32 to get large file support without needing all users
+            // of the library to match.
+            cflags: ["-D_FILE_OFFSET_BITS=64"],
+        },
+    },
+    target: {
+        windows: {
+            enabled: false,
+        },
+    },
+}
+
+// This target is used to extract the build commands for a test executable.
+// See run_tests.py.
+cc_binary {
+    name: "libcxx_test_template",
+    srcs: [
+        "libcxx_test_template.cpp",
+    ],
+    cppflags: [
+        "-fsized-deallocation",
+        "-fexceptions",
+        "-Wno-format-zero-length",
+        "-Wno-implicit-fallthrough",
+        "-Wno-non-virtual-dtor",
+        "-Wno-return-stack-address",
+        "-Wno-unused-local-typedef",
+
+        "-UNDEBUG",
+
+        // Optimization is causing relocation for nothrow new to be thrown away.
+        // http://llvm.org/bugs/show_bug.cgi?id=21421
+        "-O0",
+    ],
+    static_libs: [
+        "libc++experimental",
+        "libc++fs",
+    ],
+    rtti: true,
+    local_include_dirs: [
+        "test/support",
+    ],
+    multilib: {
+        lib32: {
+            suffix: "32",
+        },
+        lib64: {
+            suffix: "64",
+        },
+    },
+    compile_multilib: "both",
+    host_supported: true,
+    target: {
+        linux: {
+            ldflags: [
+                // This makes the tests run a little faster.
+                "-Wl,--strip-all",
+            ],
+        },
+    },
+    gnu_extensions: false,
+    cpp_std: "c++17",
+}
+
+// Export libc++ headers for inclusion in the musl sysroot.
+genrule {
+    name: "libc_musl_sysroot_libc++_headers",
+    visibility: ["//external/musl"],
+    srcs: [
+        "LICENSE.TXT",
+        "include/**/*",
+        ":libcxxabi_headers",
+    ],
+    out: ["libc_musl_sysroot_libc++_headers.zip"],
+    tools: [
+        "soong_zip",
+        "zip2zip",
+    ],
+    cmd: "LIBCXX_DIR=$$(dirname $(location LICENSE.TXT)) && " +
+        "$(location soong_zip) -o $(genDir)/sysroot.zip -symlinks=false" +
+        // LICENSE.TXT
+        " -j -f $(location LICENSE.TXT) " +
+        // headers
+        " -P include/c++ " +
+        "  -C $${LIBCXX_DIR}/include " +
+        "  -D $${LIBCXX_DIR}/include " +
+        " && " +
+        "$(location zip2zip) -i $(genDir)/sysroot.zip -o $(out) " +
+        " -x include/c++/CMakeLists.txt" +
+        " -x include/c++/module.modulemap " +
+        " include/**/*:include " +
+        " LICENSE.TXT:LICENSE.libc++",
+}