| """This module defines the ndk_cc_toolchain_config rule. |
| |
| This file is based on the `external/androidndk/cc_toolchain_config.bzl` file produced by the |
| built-in `android_ndk_repository` Bazel rule[1], which was used to build the SkCMS repository up |
| until this revision[2]. |
| |
| The paths in this file point to locations inside the expanded Android NDK ZIP file (found at |
| external/android_ndk), and must be updated every time we upgrade to a new Android NDK version. |
| |
| [1] https://github.com/bazelbuild/bazel/blob/4710ef82ce34572878e07c52e83a0144d707f140/src/main/java/com/google/devtools/build/lib/bazel/rules/android/AndroidNdkRepositoryFunction.java#L422 |
| [2] https://skia.googlesource.com/skcms/+/30c8e303800c256febb03a09fdcda7f75d119b1b/WORKSPACE#22 |
| """ |
| |
| load("@bazel_tools//tools/build_defs/cc:action_names.bzl", "ACTION_NAMES") |
| load( |
| "@bazel_tools//tools/cpp:cc_toolchain_config_lib.bzl", |
| "feature", |
| "flag_group", |
| "flag_set", |
| "tool_path", |
| "with_feature_set", |
| ) |
| load("download_toolchains.bzl", "NDK_PATH") |
| |
| # Supported CPUs. |
| _ARMEABI_V7A = "armeabi-v7a" |
| _ARM64_V8A = "arm64-v8a" |
| |
| _all_compile_actions = [ |
| ACTION_NAMES.c_compile, |
| ACTION_NAMES.cpp_compile, |
| ACTION_NAMES.linkstamp_compile, |
| ACTION_NAMES.assemble, |
| ACTION_NAMES.preprocess_assemble, |
| ACTION_NAMES.cpp_header_parsing, |
| ACTION_NAMES.cpp_module_compile, |
| ACTION_NAMES.cpp_module_codegen, |
| ACTION_NAMES.clif_match, |
| ACTION_NAMES.lto_backend, |
| ] |
| |
| _all_link_actions = [ |
| ACTION_NAMES.cpp_link_executable, |
| ACTION_NAMES.cpp_link_dynamic_library, |
| ACTION_NAMES.cpp_link_nodeps_dynamic_library, |
| ] |
| |
| def _get_default_compile_flags(cpu): |
| if cpu == _ARMEABI_V7A: |
| return [ |
| "-D__ANDROID_API__=29", |
| "-isystem", |
| NDK_PATH + "/sysroot/usr/include/arm-linux-androideabi", |
| "-target", |
| "armv7-none-linux-androideabi", |
| "-march=armv7-a", |
| "-mfloat-abi=softfp", |
| "-mfpu=vfpv3-d16", |
| "-gcc-toolchain", |
| NDK_PATH + "/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64", |
| "-fpic", |
| "-no-canonical-prefixes", |
| "-Wno-invalid-command-line-argument", |
| "-Wno-unused-command-line-argument", |
| "-funwind-tables", |
| "-fstack-protector-strong", |
| "-fno-addrsig", |
| "-Werror=return-type", |
| "-Werror=int-to-pointer-cast", |
| "-Werror=pointer-to-int-cast", |
| "-Werror=implicit-function-declaration", |
| ] |
| if cpu == _ARM64_V8A: |
| return [ |
| "-gcc-toolchain", |
| NDK_PATH + "/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64", |
| "-target", |
| "aarch64-none-linux-android", |
| "-fpic", |
| "-isystem", |
| NDK_PATH + "/sysroot/usr/include/aarch64-linux-android", |
| "-D__ANDROID_API__=29", |
| "-no-canonical-prefixes", |
| "-Wno-invalid-command-line-argument", |
| "-Wno-unused-command-line-argument", |
| "-funwind-tables", |
| "-fstack-protector-strong", |
| "-fno-addrsig", |
| "-Werror=return-type", |
| "-Werror=int-to-pointer-cast", |
| "-Werror=pointer-to-int-cast", |
| "-Werror=implicit-function-declaration", |
| ] |
| fail("Unknown CPU: " + cpu) |
| |
| def _get_default_link_flags(cpu): |
| if cpu == _ARMEABI_V7A: |
| return [ |
| "-target", |
| "armv7-none-linux-androideabi", |
| "-gcc-toolchain", |
| NDK_PATH + "/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64", |
| "-L", |
| NDK_PATH + "/sources/cxx-stl/llvm-libc++/libs/armeabi-v7a", |
| "-no-canonical-prefixes", |
| "-Wl,-z,relro", |
| "-Wl,--gc-sections", |
| ] |
| if cpu == _ARM64_V8A: |
| return [ |
| "-gcc-toolchain", |
| NDK_PATH + "/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64", |
| "-target", |
| "aarch64-none-linux-android", |
| "-L", |
| NDK_PATH + "/sources/cxx-stl/llvm-libc++/libs/arm64-v8a", |
| "-no-canonical-prefixes", |
| "-Wl,-z,relro", |
| "-Wl,--gc-sections", |
| ] |
| fail("Unknown CPU: " + cpu) |
| |
| def _get_default_dbg_flags(cpu): |
| if cpu == _ARMEABI_V7A: |
| return ["-g", "-fno-strict-aliasing", "-O0", "-UNDEBUG"] |
| if cpu == _ARM64_V8A: |
| return ["-O0", "-g", "-UNDEBUG"] |
| fail("Unknown CPU: " + cpu) |
| |
| def _get_default_opt_flags(cpu): |
| if cpu == _ARMEABI_V7A: |
| return ["-mthumb", "-Os", "-g", "-DNDEBUG"] |
| if cpu == _ARM64_V8A: |
| return ["-O2", "-g", "-DNDEBUG"] |
| fail("Unknown CPU: " + cpu) |
| |
| def _get_toolchain_identifier(cpu): |
| if cpu == _ARMEABI_V7A: |
| return "ndk-armeabi-v7a-toolchain" |
| if cpu == _ARM64_V8A: |
| return "ndk-arm64-v8a-toolchain" |
| fail("Unknown CPU: " + cpu) |
| |
| def _get_target_system_name(cpu): |
| if cpu == _ARMEABI_V7A: |
| return "arm-linux-androideabi" |
| if cpu == _ARM64_V8A: |
| return "aarch64-linux-android" |
| fail("Unknown CPU: " + cpu) |
| |
| def _get_builtin_sysroot(cpu): |
| if cpu == _ARMEABI_V7A: |
| return NDK_PATH + "/platforms/android-29/arch-arm" |
| if cpu == _ARM64_V8A: |
| return NDK_PATH + "/platforms/android-29/arch-arm64" |
| fail("Unknown CPU: " + cpu) |
| |
| def _get_tool_paths(cpu): |
| # The cc_common.create_cc_toolchain_config_info function expects tool paths to point to files |
| # under the directory in which it is invoked. This means we cannot directly reference tools |
| # under external/android_ndk. The solution is to use "trampoline" scripts that pass through |
| # any command-line arguments to the NDK binaries under external/android_sdk. |
| |
| if cpu == _ARMEABI_V7A: |
| return [ |
| tool_path( |
| name = "ar", |
| path = "trampolines/arm-linux-androideabi-ar.sh", |
| ), |
| tool_path( |
| name = "cpp", |
| path = "trampolines/clang.sh", |
| ), |
| tool_path( |
| name = "dwp", |
| path = "trampolines/arm-linux-androideabi-dwp.sh", |
| ), |
| tool_path( |
| name = "gcc", |
| path = "trampolines/clang.sh", |
| ), |
| tool_path( |
| name = "gcov", |
| path = "/bin/false", |
| ), |
| tool_path( |
| name = "ld", |
| path = "trampolines/arm-linux-androideabi-ld.sh", |
| ), |
| tool_path( |
| name = "nm", |
| path = "trampolines/arm-linux-androideabi-nm.sh", |
| ), |
| tool_path( |
| name = "objcopy", |
| path = "trampolines/arm-linux-androideabi-objcopy.sh", |
| ), |
| tool_path( |
| name = "objdump", |
| path = "trampolines/arm-linux-androideabi-objdump.sh", |
| ), |
| tool_path( |
| name = "strip", |
| path = "trampolines/arm-linux-androideabi-strip.sh", |
| ), |
| ] |
| if cpu == _ARM64_V8A: |
| return [ |
| tool_path( |
| name = "ar", |
| path = "trampolines/aarch64-linux-android-ar.sh", |
| ), |
| tool_path( |
| name = "cpp", |
| path = "trampolines/clang.sh", |
| ), |
| tool_path( |
| name = "dwp", |
| path = "trampolines/aarch64-linux-android-dwp.sh", |
| ), |
| tool_path( |
| name = "gcc", |
| path = "trampolines/clang.sh", |
| ), |
| tool_path( |
| name = "gcov", |
| path = "/bin/false", |
| ), |
| tool_path( |
| name = "ld", |
| path = "trampolines/aarch64-linux-android-ld.sh", |
| ), |
| tool_path( |
| name = "nm", |
| path = "trampolines/aarch64-linux-android-nm.sh", |
| ), |
| tool_path( |
| name = "objcopy", |
| path = "trampolines/aarch64-linux-android-objcopy.sh", |
| ), |
| tool_path( |
| name = "objdump", |
| path = "trampolines/aarch64-linux-android-objdump.sh", |
| ), |
| tool_path( |
| name = "strip", |
| path = "trampolines/aarch64-linux-android-strip.sh", |
| ), |
| ] |
| fail("Unknown CPU: " + cpu) |
| |
| def _ndk_cc_toolchain_config_impl(ctx): |
| default_compile_flags = _get_default_compile_flags(ctx.attr.cpu) |
| unfiltered_compile_flags = [ |
| "-isystem", |
| NDK_PATH + "/sources/cxx-stl/llvm-libc++/include", |
| "-isystem", |
| NDK_PATH + "/sources/cxx-stl/llvm-libc++abi/include", |
| "-isystem", |
| NDK_PATH + "/sources/android/support/include", |
| "-isystem", |
| NDK_PATH + "/sysroot/usr/include", |
| ] |
| default_link_flags = _get_default_link_flags(ctx.attr.cpu) |
| default_fastbuild_flags = [""] |
| default_dbg_flags = _get_default_dbg_flags(ctx.attr.cpu) |
| default_opt_flags = _get_default_opt_flags(ctx.attr.cpu) |
| |
| opt_feature = feature(name = "opt") |
| fastbuild_feature = feature(name = "fastbuild") |
| dbg_feature = feature(name = "dbg") |
| supports_dynamic_linker_feature = feature(name = "supports_dynamic_linker", enabled = True) |
| supports_pic_feature = feature(name = "supports_pic", enabled = True) |
| static_link_cpp_runtimes_feature = feature(name = "static_link_cpp_runtimes", enabled = True) |
| |
| default_compile_flags_feature = feature( |
| name = "default_compile_flags", |
| enabled = True, |
| flag_sets = [ |
| flag_set( |
| actions = _all_compile_actions, |
| flag_groups = [flag_group(flags = default_compile_flags)], |
| ), |
| flag_set( |
| actions = _all_compile_actions, |
| flag_groups = [flag_group(flags = default_fastbuild_flags)], |
| with_features = [with_feature_set(features = ["fastbuild"])], |
| ), |
| flag_set( |
| actions = _all_compile_actions, |
| flag_groups = [flag_group(flags = default_dbg_flags)], |
| with_features = [with_feature_set(features = ["dbg"])], |
| ), |
| flag_set( |
| actions = _all_compile_actions, |
| flag_groups = [flag_group(flags = default_opt_flags)], |
| with_features = [with_feature_set(features = ["opt"])], |
| ), |
| ], |
| ) |
| |
| default_link_flags_feature = feature( |
| name = "default_link_flags", |
| enabled = True, |
| flag_sets = [ |
| flag_set( |
| actions = _all_link_actions, |
| flag_groups = [flag_group(flags = default_link_flags)], |
| ), |
| ], |
| ) |
| |
| user_compile_flags_feature = feature( |
| name = "user_compile_flags", |
| enabled = True, |
| flag_sets = [ |
| flag_set( |
| actions = _all_compile_actions, |
| flag_groups = [ |
| flag_group( |
| flags = ["%{user_compile_flags}"], |
| iterate_over = "user_compile_flags", |
| expand_if_available = "user_compile_flags", |
| ), |
| ], |
| ), |
| ], |
| ) |
| |
| sysroot_feature = feature( |
| name = "sysroot", |
| enabled = True, |
| flag_sets = [ |
| flag_set( |
| actions = _all_compile_actions + _all_link_actions, |
| flag_groups = [ |
| flag_group( |
| flags = ["--sysroot=%{sysroot}"], |
| expand_if_available = "sysroot", |
| ), |
| ], |
| ), |
| ], |
| ) |
| |
| unfiltered_compile_flags_feature = feature( |
| name = "unfiltered_compile_flags", |
| enabled = True, |
| flag_sets = [ |
| flag_set( |
| actions = _all_compile_actions, |
| flag_groups = [flag_group(flags = unfiltered_compile_flags)], |
| ), |
| ], |
| ) |
| |
| features = [ |
| default_compile_flags_feature, |
| default_link_flags_feature, |
| supports_dynamic_linker_feature, |
| supports_pic_feature, |
| static_link_cpp_runtimes_feature, |
| fastbuild_feature, |
| dbg_feature, |
| opt_feature, |
| user_compile_flags_feature, |
| sysroot_feature, |
| unfiltered_compile_flags_feature, |
| ] |
| |
| cxx_builtin_include_directories = [ |
| NDK_PATH + "/toolchains/llvm/prebuilt/linux-x86_64/lib64/clang/9.0.9/include", |
| "%sysroot%/usr/include", |
| NDK_PATH + "/sysroot/usr/include", |
| ] |
| |
| # https://bazel.build/rules/lib/cc_common#create_cc_toolchain_config_info |
| return cc_common.create_cc_toolchain_config_info( |
| ctx = ctx, |
| toolchain_identifier = _get_toolchain_identifier(ctx.attr.cpu), |
| host_system_name = "local", |
| target_system_name = _get_target_system_name(ctx.attr.cpu), |
| target_cpu = ctx.attr.cpu, |
| target_libc = "local", |
| compiler = "clang9.0.9", |
| abi_version = ctx.attr.cpu, |
| abi_libc_version = "local", |
| features = features, |
| tool_paths = _get_tool_paths(ctx.attr.cpu), |
| cxx_builtin_include_directories = cxx_builtin_include_directories, |
| builtin_sysroot = _get_builtin_sysroot(ctx.attr.cpu), |
| ) |
| |
| ndk_cc_toolchain_config = rule( |
| implementation = _ndk_cc_toolchain_config_impl, |
| attrs = { |
| "cpu": attr.string( |
| mandatory = True, |
| values = [_ARMEABI_V7A, _ARM64_V8A], |
| doc = "Target CPU.", |
| ) |
| }, |
| provides = [CcToolchainConfigInfo], |
| ) |
