overriding/libc/Android.bp

//
// Copyright (C) 2020 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.
//

cc_library {
    defaults: [
        "native_bridge_stub_library_defaults",
        // Definitions come from bionic/libc/Android.bp that force
        // the usage of the correct native allocator.
        "libc_native_allocator_defaults",
    ],
    name: "libnative_bridge_guest_libc",
    overrides: ["libc"],
    stem: "libc",

    srcs: [
        ":libc_sources_shared",
        "__cxa_thread_atexit_impl.cpp",
        "__libc_add_main_thread.cpp",
        "exit.c",
        "fork.cpp",
        "malloc_init.cpp",
    ],

    include_dirs: [
        "bionic/libc",
        "bionic/libc/arch-common/bionic",
        "bionic/libc/async_safe/include",
        "bionic/libc/bionic",
        "bionic/libc/stdio",
        "bionic/libstdc++/include",
    ],

    cflags: [
        "-D_LIBC=1",
        "-fno-emulated-tls", // Required for GWP-Asan.
    ],

    product_variables: {
        platform_sdk_version: {
            asflags: ["-DPLATFORM_SDK_VERSION=%d"],
            cflags: ["-DPLATFORM_SDK_VERSION=%d"],
        },
    },

    arch: {
        arm: {
            srcs: [
                ":libc_sources_shared_arm",
                "stubs_arm.cpp",
            ],

            cflags: [
                "-DCRT_LEGACY_WORKAROUND",
            ],

            version_script: ":libc.arm.map",

            // Arm 32 bit does not produce complete exidx unwind information
            // so keep the .debug_frame which is relatively small and does
            // include needed unwind information.
            // See b/132992102 for details.
            strip: {
                keep_symbols_and_debug_frame: true,
            },

            whole_static_libs: [ "libunwind_llvm" ],
        },
        arm64: {
            srcs: ["stubs_arm64.cpp"],

            version_script: ":libc.arm64.map",

            // Leave the symbols in the shared library so that stack unwinders can produce
            // meaningful name resolution.
            strip: {
                keep_symbols: true,
            },

            whole_static_libs: [ "libgcc_stripped" ],
        }
    },

    nocrt: true,

    required: ["tzdata"],

    whole_static_libs: [
        "gwp_asan",
        "libc_init_dynamic",
        "libc_common_shared",
    ],

    shared_libs: [
        "ld-android",
        "libdl",
    ],

    static_libs: [
        "libdl_android",
    ],

    system_shared_libs: [],
    stl: "none",

    strip: {
        keep_symbols: true,
    },

    sanitize: {
        never: true,
    },

    // lld complains about duplicate symbols in libcrt and libgcc. Suppress the
    // warning since this is intended right now.
    // Bug: 117558759
    ldflags: ["-Wl,-z,muldefs"],
}