| """ |
| This file assembles a toolchain for a Mac host (either M1 or Intel) using the Clang Compiler |
| and a locally-installed XCode. |
| |
| It downloads the necessary executables and creates symlinks in the external subfolder of the Bazel |
| cache (the same place third party deps are downloaded with http_archive or similar functions in |
| WORKSPACE.bazel). These will be able to be used via our |
| custom c++ toolchain configuration (see //toolchain/mac_toolchain_config.bzl) |
| |
| The destination folder for these files and symlinks are: |
| [outputRoot (aka Bazel cache)]/[outputUserRoot]/[outputBase]/external/clang_mac |
| (See https://bazel.build/docs/output_directories#layout-diagram) |
| """ |
| |
| load(":clang_layering_check.bzl", "generate_system_module_map") |
| load(":utils.bzl", "gcs_mirror_url") |
| |
| # From https://github.com/llvm/llvm-project/releases/tag/llvmorg-15.0.1 |
| # When updating this, don't forget to use //bazel/gcs_mirror to upload a new version. |
| # go run bazel/gcs_mirror/gcs_mirror.go --url [clang_url] --sha256 [clang_sha256] |
| clang_prefix_arm64 = "clang+llvm-15.0.1-arm64-apple-darwin21.0" |
| clang_sha256_arm64 = "858f86d96b5e4880f69f7a583daddbf97ee94e7cffce0d53aa05cba6967f13b8" |
| clang_url_arm64 = "https://github.com/llvm/llvm-project/releases/download/llvmorg-15.0.1/clang+llvm-15.0.1-arm64-apple-darwin21.0.tar.xz" |
| |
| clang_prefix_amd64 = "clang+llvm-15.0.1-x86_64-apple-darwin" |
| clang_sha256_amd64 = "0b2f1a811e68d011344103274733b7670c15bbe08b2a3a5140ccad8e19d9311e" |
| clang_url_amd64 = "https://github.com/llvm/llvm-project/releases/download/llvmorg-15.0.1/clang+llvm-15.0.1-x86_64-apple-darwin.tar.xz" |
| |
| def _get_system_xcode_path(ctx): |
| # https://developer.apple.com/library/archive/technotes/tn2339/_index.html |
| res = ctx.execute(["xcode-select", "-p"]) |
| if res.return_code != 0: |
| fail("Error Getting XCode path: " + res.stderr) |
| return res.stdout.rstrip() |
| |
| def _delete_macos_sdk_symlinks(ctx): |
| ctx.delete("./symlinks/xcode/MacSDK/usr") |
| ctx.delete("./symlinks/xcode/MacSDK/Frameworks") |
| |
| def _create_macos_sdk_symlinks(ctx): |
| system_xcode_path = _get_system_xcode_path(ctx) |
| |
| # https://bazel.build/rules/lib/actions#symlink |
| ctx.symlink( |
| # from = |
| system_xcode_path + "/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr", |
| # to = |
| "./symlinks/xcode/MacSDK/usr", |
| ) |
| ctx.symlink( |
| # from = |
| system_xcode_path + "/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks", |
| # to = |
| "./symlinks/xcode/MacSDK/Frameworks", |
| ) |
| |
| def _download_mac_toolchain_impl(ctx): |
| # https://bazel.build/rules/lib/repository_ctx#os |
| # https://bazel.build/rules/lib/repository_os |
| if ctx.os.arch == "aarch64": |
| clang_url = clang_url_arm64 |
| clang_sha256 = clang_sha256_arm64 |
| clang_prefix = clang_prefix_arm64 |
| else: |
| clang_url = clang_url_amd64 |
| clang_sha256 = clang_sha256_amd64 |
| clang_prefix = clang_prefix_amd64 |
| |
| # Download the clang toolchain (the extraction can take a while) |
| # https://bazel.build/rules/lib/repository_ctx#download_and_extract |
| ctx.download_and_extract( |
| url = gcs_mirror_url(clang_url, clang_sha256), |
| output = "", |
| stripPrefix = clang_prefix, |
| sha256 = clang_sha256, |
| ) |
| |
| # Some std library headers use #include_next to include system specific headers, and |
| # some skia source files require Xcode headers when compiling, (see SkTypes.h and look |
| # for TargetedConditionals.h)) All of these are located in Xcode, stopping the Mac |
| # builds from being purely hermetic. |
| # For now, we can grab the user's Xcode path by calling xcode-select and create a symlink in |
| # our toolchain directory to refer to during compilation. |
| |
| _delete_macos_sdk_symlinks(ctx) |
| _create_macos_sdk_symlinks(ctx) |
| |
| # This list of files lines up with _make_default_flags() in mac_toolchain_config.bzl |
| # It is all locations that our toolchain could find a system header. |
| builtin_include_directories = [ |
| "include/c++/v1", |
| "lib/clang/15.0.1/include", |
| "symlinks/xcode/MacSDK/Frameworks", |
| "symlinks/xcode/MacSDK/usr/include", |
| ] |
| |
| generate_system_module_map( |
| ctx, |
| module_file = "toolchain_system_headers.modulemap", |
| folders = builtin_include_directories, |
| ) |
| |
| # Create a BUILD.bazel file that makes the files necessary for compiling, |
| # linking and creating archive files visible to Bazel. |
| # The smaller the globs are, the more performant the sandboxed builds will be. |
| # Additionally, globs that are too wide can pick up infinite symlink loops, |
| # and be difficult to quash: https://github.com/bazelbuild/bazel/issues/13950 |
| # https://bazel.build/rules/lib/repository_ctx#file |
| ctx.file( |
| "BUILD.bazel", |
| content = """ |
| # DO NOT EDIT THIS BAZEL FILE DIRECTLY |
| # Generated from ctx.file action in download_mac_toolchain.bzl |
| filegroup( |
| name = "generated_module_map", |
| srcs = ["toolchain_system_headers.modulemap"], |
| visibility = ["//visibility:public"], |
| ) |
| |
| filegroup( |
| name = "archive_files", |
| srcs = [ |
| "bin/llvm-ar", |
| ], |
| visibility = ["//visibility:public"], |
| ) |
| |
| filegroup( |
| name = "compile_files", |
| srcs = [ |
| "bin/clang", |
| ] + glob( |
| include = [ |
| "include/c++/v1/**", |
| "lib/clang/15.0.1/include/**", |
| "symlinks/xcode/MacSDK/Frameworks/AppKit.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/ApplicationServices.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/Carbon.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/CFNetwork.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/CloudKit.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/Cocoa.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/ColorSync.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/CoreData.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/CoreFoundation.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/CoreGraphics.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/CoreImage.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/CoreLocation.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/CoreServices.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/CoreText.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/CoreVideo.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/DiskArbitration.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/Foundation.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/ImageIO.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/IOKit.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/IOSurface.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/Metal.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/OpenGL.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/QuartzCore.Framework/**", |
| "symlinks/xcode/MacSDK/Frameworks/Security.Framework/**", |
| "symlinks/xcode/MacSDK/usr/include/**", |
| ], |
| allow_empty = False, |
| ), |
| visibility = ["//visibility:public"], |
| ) |
| |
| filegroup( |
| name = "link_files", |
| srcs = [ |
| "bin/clang", |
| "bin/ld.lld", |
| "bin/lld", |
| "lib/libc++.a", |
| "lib/libc++abi.a", |
| "lib/libunwind.a", |
| ] + glob( |
| include = [ |
| # libc++.tbd and libSystem.tbd live here. |
| "symlinks/xcode/MacSDK/usr/lib/*", |
| ], |
| allow_empty = False, |
| ), |
| visibility = ["//visibility:public"], |
| ) |
| """, |
| executable = False, |
| ) |
| |
| # https://bazel.build/rules/repository_rules |
| download_mac_toolchain = repository_rule( |
| implementation = _download_mac_toolchain_impl, |
| attrs = {}, |
| doc = "Downloads clang to build Skia with." + |
| "Assumes you have xcode located on your device and have" + |
| "xcode-select in your $PATH.", |
| ) |
