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