306 lines
11 KiB
Python
306 lines
11 KiB
Python
load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
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load(":zig_toolchain.bzl", "zig_cc_toolchain_config")
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DEFAULT_TOOL_PATHS = {
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"ar": "llvm-ar", # TODO this should be "build-lib", see https://github.com/ziglang/zig/issues/7915
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"cpp": "c++",
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"gcc": "cc",
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# TODO See https://github.com/ziglang/zig/issues/7917 for zig issue to implement these other tools.
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"gcov": "/usr/bin/false",
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"nm": "/usr/bin/false",
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"objdump": "/usr/bin/false",
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"strip": "/usr/bin/false",
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}.items()
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DEFAULT_INCLUDE_DIRECTORIES = [
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"include",
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# "libcxx/include",
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# "libcxxabi/include",
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# "libunwind/include",
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]
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# https://github.com/ziglang/zig/blob/0cfa39304b18c6a04689bd789f5dc4d035ec43b0/src/main.zig#L2962-L2966
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TARGET_CONFIGS = [
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struct(
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target="x86_64-macos-gnu",
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includes=[
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"libcxx/include",
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"libcxxabi/include",
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"libunwind/include",
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"libc/include/any-macos-any",
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"libc/include/x86_64-macos-any",
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"libc/include/x86_64-macos-gnu",
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],
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# linkopts=["-lc++", "-lc++abi"],
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linkopts=[],
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copts=[],
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bazel_target_cpu="darwin",
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constraint_values=["@platforms//os:macos", "@platforms//cpu:x86_64"],
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tool_paths={"ld": "ld64.lld"},
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),
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struct(
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target="x86_64-linux-gnu.2.28",
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includes=[
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"libcxx/include",
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"libcxxabi/include",
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"libunwind/include",
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"libc/include/generic-glibc",
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"libc/include/any-linux-any",
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"libc/include/x86_64-linux-gnu",
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"libc/include/x86_64-linux-any",
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],
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linkopts=["-lc++", "-lc++abi"],
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copts=[],
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bazel_target_cpu="k8",
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constraint_values=["@platforms//os:linux", "@platforms//cpu:x86_64"],
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tool_paths={"ld": "ld.lld"},
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),
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# struct(
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# target="x86_64-linux-musl",
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# includes=[
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# "libcxx/include",
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# "libcxxabi/include",
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# "libc/include/generic-musl",
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# "libc/include/any-linux-any",
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# "libc/include/x86_64-linux-musl",
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# "libc/include/x86_64-linux-any",
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# ],
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# linkopts=[],
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# # linkopts=["-lc++", "-lc++abi"],
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# copts=["-D_LIBCPP_HAS_MUSL_LIBC", "-D_LIBCPP_HAS_THREAD_API_PTHREAD"],
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# constraint_values=["@platforms//os:linux", "@platforms//cpu:x86_64"],
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# tool_paths={"ld": "ld.lld"},
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# ),
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]
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def toolchain_repositories():
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# We need llvm-ar for now, so get it.
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llvm_patch_cmds = [
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"mv bin/llvm-ar .",
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"rm -r include lib libexec share bin",
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"echo 'def noop(): pass' > noop.bzl",
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]
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llvm_build_file_content = """
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package(default_visibility = ["//visibility:public"])
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exports_files(glob["**"])
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"""
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http_archive(
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name = "com_github_ziglang_zig_llvm_tools_macos_x86_64",
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# sha256 = "",
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patch_cmds = llvm_patch_cmds,
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build_file_content = llvm_build_file_content,
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strip_prefix = "clang+llvm-11.0.0-x86_64-apple-darwin",
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urls = [
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"https://github.com/llvm/llvm-project/releases/download/llvmorg-11.0.0/clang+llvm-11.0.0-x86_64-apple-darwin.tar.xz",
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],
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)
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http_archive(
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name = "com_github_ziglang_zig_llvm_tools_linux_x86_64",
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sha256 = "829f5fb0ebda1d8716464394f97d5475d465ddc7bea2879c0601316b611ff6db",
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patch_cmds = llvm_patch_cmds,
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build_file_content = llvm_build_file_content,
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strip_prefix = "clang+llvm-11.0.0-x86_64-linux-gnu-ubuntu-20.04",
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urls = [
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"https://github.com/llvm/llvm-project/releases/download/llvmorg-11.0.0/clang+llvm-11.0.0-x86_64-linux-gnu-ubuntu-20.04.tar.xz",
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],
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)
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zig_repository(
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name = "com_github_ziglang_zig",
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version = "0.8.0-dev.1802+b3f5d4dc4",
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url_format = "https://ziglang.org/builds/zig-{host_platform}-{version}.tar.xz",
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host_platform_sha256 = {
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"linux-x86_64": "433a3773413b1f3f303a57da70057edd6b2cdb9831934ddd8e8cbda399d9410a",
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"macos-x86_64": "e54cb8a6a510011f946cef6ada45064fe3df4faa86705d98f258ef985e882db3",
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},
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# version = "0.7.1",
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# url_format = "https://ziglang.org/download/{version}/zig-{host_platform}-{version}.tar.xz",
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# host_platform_sha256 = {
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# "macos-x86_64": "845cb17562978af0cf67e3993f4e33330525eaf01ead9386df9105111e3bc519",
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# "linux-x86_64": "18c7b9b200600f8bcde1cd8d7f1f578cbc3676241ce36d771937ce19a8159b8d",
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# },
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host_platform_include_root = {
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"macos-x86_64": "lib/zig/",
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"linux-x86_64": "lib/",
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}
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)
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def register_all_toolchains():
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for target_config in TARGET_CONFIGS:
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native.register_toolchains(
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"@com_github_ziglang_zig//:%s_toolchain" % target_config.target,
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)
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ZIG_TOOL_PATH = "tools/{zig_tool}"
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ZIG_TOOL_WRAPPER = """#!/bin/bash
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export HOME=$TMPDIR
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exec "{zig}" "{zig_tool}" "$@"
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"""
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ZIG_TOOLS = [
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"c++",
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"cc",
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"build-lib", # https://github.com/ziglang/zig/issues/7915
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# List of ld tools: https://github.com/ziglang/zig/blob/0cfa39304b18c6a04689bd789f5dc4d035ec43b0/src/main.zig#L2962-L2966
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# and also: https://github.com/ziglang/zig/issues/3257
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"ld.lld", # ELF
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"ld64.lld", # Mach-O
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"lld-link", # COFF
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"wasm-ld", # WebAssembly
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]
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TOOLS = ZIG_TOOLS + [
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"llvm-ar",
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]
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BUILD = """
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load("@zig-cc-bazel-exceptions//zig-toolchains:defs.bzl", "zig_build_macro")
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load("@{llvm_tools_repo}//:noop.bzl", "noop")
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noop()
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package(default_visibility = ["//visibility:public"])
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zig_build_macro(absolute_path={absolute_path}, zig_include_root={zig_include_root})
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"""
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def _zig_repository_impl(repository_ctx):
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if repository_ctx.os.name.lower().startswith("mac os"):
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llvm_tools_repo = "com_github_ziglang_zig_llvm_tools_macos_x86_64"
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host_platform = "macos-x86_64"
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else:
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host_platform = "linux-x86_64"
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llvm_tools_repo = "com_github_ziglang_zig_llvm_tools_linux_x86_64"
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zig_include_root = repository_ctx.attr.host_platform_include_root[host_platform]
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zig_sha256 = repository_ctx.attr.host_platform_sha256[host_platform]
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format_vars = {
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"version" : repository_ctx.attr.version,
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"host_platform" : host_platform,
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}
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zig_url = repository_ctx.attr.url_format.format(**format_vars)
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repository_ctx.download_and_extract(
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url = zig_url,
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stripPrefix = "zig-{host_platform}-{version}/".format(**format_vars),
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sha256 = zig_sha256,
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)
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# TODO Use llvm-ar for host platform until we have https://github.com/ziglang/zig/issues/7915
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llvm_tools_dir = str(repository_ctx.path("")) + "/../" + llvm_tools_repo
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repository_ctx.symlink(llvm_tools_dir + "/llvm-ar", ZIG_TOOL_PATH.format(zig_tool="llvm-ar"))
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for zig_tool in ZIG_TOOLS:
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repository_ctx.file(
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ZIG_TOOL_PATH.format(zig_tool=zig_tool),
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ZIG_TOOL_WRAPPER.format(zig=str(repository_ctx.path("zig")), zig_tool=zig_tool),
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)
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absolute_path = json.encode(str(repository_ctx.path("")))
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repository_ctx.file(
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"BUILD",
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BUILD.format(absolute_path=absolute_path, llvm_tools_repo=llvm_tools_repo, zig_include_root=json.encode(zig_include_root)),
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)
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zig_repository = repository_rule(
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attrs = {
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"url": attr.string(),
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"version": attr.string(),
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"host_platform_sha256": attr.string_dict(),
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"url_format": attr.string(),
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"host_platform_include_root": attr.string_dict(),
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},
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implementation = _zig_repository_impl,
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)
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def filegroup(name, **kwargs):
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native.filegroup(name = name, **kwargs)
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return ":" + name
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def zig_build_macro(absolute_path, zig_include_root):
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filegroup(name="empty")
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filegroup(name="zig_compiler", srcs=["zig"])
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filegroup(name="lib/std", srcs=native.glob(["lib/std/**"]))
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lazy_filegroups = {}
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for target_config in TARGET_CONFIGS:
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target = target_config.target
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native.platform(name = target, constraint_values = target_config.constraint_values)
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all_srcs = []
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ar_srcs = [":zig_compiler"]
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linker_srcs = [":zig_compiler"]
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compiler_srcs = [":zig_compiler"]
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tool_srcs = {"gcc": compiler_srcs, "cpp": compiler_srcs, "ld": linker_srcs, "ar": ar_srcs}
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cxx_builtin_include_directories = []
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for d in DEFAULT_INCLUDE_DIRECTORIES + target_config.includes:
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d = zig_include_root + d
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if d not in lazy_filegroups:
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lazy_filegroups[d] = filegroup(name=d, srcs=native.glob([d + "/**"]))
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compiler_srcs.append(lazy_filegroups[d])
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cxx_builtin_include_directories.append(absolute_path + "/" + d)
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absolute_tool_paths = {}
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for name, path in target_config.tool_paths.items() + DEFAULT_TOOL_PATHS:
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if path[0] == "/":
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absolute_tool_paths[name] = path
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continue
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tool_path = ZIG_TOOL_PATH.format(zig_tool=path)
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absolute_tool_paths[name] = "%s/%s" % (absolute_path, tool_path)
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tool_srcs[name].append(tool_path)
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ar_files = filegroup(name=target + "_ar_files", srcs=ar_srcs)
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linker_files = filegroup(name=target + "_linker_files", srcs=linker_srcs)
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compiler_files = filegroup(name=target + "_compiler_files", srcs=compiler_srcs)
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all_files = filegroup(name=target + "_all_files", srcs=all_srcs + [ar_files, linker_files, compiler_files])
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zig_cc_toolchain_config(
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name = target + "_cc_toolchain_config",
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target = target,
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tool_paths = absolute_tool_paths,
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cxx_builtin_include_directories = cxx_builtin_include_directories,
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copts = target_config.copts,
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linkopts = target_config.linkopts,
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target_system_name = "unknown",
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target_cpu = target_config.bazel_target_cpu,
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target_libc = "unknown",
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compiler = "clang",
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abi_version = "unknown",
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abi_libc_version = "unknown",
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)
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native.cc_toolchain(
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name = target + "_cc_toolchain",
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toolchain_identifier = target + "-toolchain",
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toolchain_config = ":%s_cc_toolchain_config" % target,
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all_files = all_files,
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ar_files = ar_files,
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compiler_files = compiler_files,
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linker_files = linker_files,
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dwp_files = ":empty",
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objcopy_files = ":empty",
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strip_files = ":empty",
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supports_param_files = 0,
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)
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native.cc_toolchain_suite(
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name = target + "_cc_toolchain_suite",
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toolchains = {
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target_config.bazel_target_cpu: ":%s_cc_toolchain" % target,
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},
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tags = ["manual"]
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)
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native.toolchain(
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name = target + "_toolchain",
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exec_compatible_with = None,
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target_compatible_with = target_config.constraint_values,
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toolchain = ":%s_cc_toolchain" % target,
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toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
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)
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