load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive") load("@bazel_tools//tools/build_defs/repo:utils.bzl", "read_user_netrc", "use_netrc") load("@bazel-zig-cc//toolchain/private:defs.bzl", "DEFAULT_INCLUDE_DIRECTORIES", "target_structs", "zig_tool_path") _fcntl_map = """ GLIBC_2.2.5 { fcntl; }; """ _fcntl_h = """ #ifdef __ASSEMBLER__ .symver fcntl64, fcntl@GLIBC_2.2.5 #else __asm__(".symver fcntl64, fcntl@GLIBC_2.2.5"); #endif """ # Official recommended version. Should use this when we have a usable release. URL_FORMAT_RELEASE = "https://ziglang.org/download/{version}/zig-{host_platform}-{version}.{_ext}" # Caution: nightly releases are purged from ziglang.org after ~90 days. A real # solution would be to allow the downstream project specify their own mirrors. # This is explained in # https://sr.ht/~motiejus/bazel-zig-cc/#alternative-download-urls and is # awaiting my attention or your contribution. URL_FORMAT_NIGHTLY = "https://ziglang.org/builds/zig-{host_platform}-{version}.{_ext}" # Author's mirror that doesn't purge the nightlies so aggressively. I will be # cleaning those up manually only after the artifacts are not in use for many # months in bazel-zig-cc. dl.jakstys.lt is a small x86_64 server with an NVMe # drive sitting in my home closet on a 1GB/s symmetric residential connection, # which, as of writing, has been quite reliable. URL_FORMAT_JAKSTYS = "https://dl.jakstys.lt/zig/zig-{host_platform}-{version}.{_ext}" _VERSION = "0.10.0-dev.3999+fda6d4477" _HOST_PLATFORM_SHA256 = { "linux-aarch64": "18c49fe333b46c29878e3f2f1afe53de1fa361b04b99725be3bb4dd37c3e2dcc", "linux-x86_64": "3c98d3c66359a70d70fd2acebdae6b145996307b5e808ff35526a853f8ea4e95", "macos-aarch64": "43a13b74f6a80fc3dfd73043e4cc9a361f4cae611d1ad810cee46a602d79ee10", "macos-x86_64": "bbea45efaa89c96b1b9965a2fd1817b417ef7e8491898c49034a1fd9c6a7d3fa", "windows-x86_64": "655d1e2a44abd41c6f1058230d703c272c7ee85fdb8296d0262f06dae4cb0075", } _HOST_PLATFORM_EXT = { "linux-aarch64": "tar.xz", "linux-x86_64": "tar.xz", "macos-aarch64": "tar.xz", "macos-x86_64": "tar.xz", "windows-x86_64": "zip", } def toolchains( version = _VERSION, url_formats = [URL_FORMAT_NIGHTLY, URL_FORMAT_JAKSTYS], host_platform_sha256 = _HOST_PLATFORM_SHA256, host_platform_ext = _HOST_PLATFORM_EXT): """ Download zig toolchain and declare bazel toolchains. The platforms are not registered automatically, that should be done by the user with register_toolchains() in the WORKSPACE file. See README for possible choices. """ zig_repository( name = "zig_sdk", version = version, url_formats = url_formats, host_platform_sha256 = host_platform_sha256, host_platform_ext = host_platform_ext, host_platform_include_root = { "linux-aarch64": "lib/zig/", "linux-x86_64": "lib/", "macos-aarch64": "lib/", "macos-x86_64": "lib/zig/", "windows-x86_64": "lib/", }, ) _ZIG_TOOLS = [ "c++", "cc", "ar", "ld.lld", # ELF "ld64.lld", # Mach-O "lld-link", # COFF "wasm-ld", # WebAssembly ] _ZIG_TOOL_WRAPPER_WINDOWS_CACHE_KNOWN = """@echo off set ZIG_LOCAL_CACHE_DIR={cache_prefix}\\bazel-zig-cc set ZIG_GLOBAL_CACHE_DIR=%ZIG_LOCAL_CACHE_DIR% "{zig}" "{zig_tool}" %* """ _ZIG_TOOL_WRAPPER_WINDOWS_CACHE_GUESS = """@echo off if exist "%TMP%\\*" goto :usertmp set ZIG_LOCAL_CACHE_DIR=C:\\Temp\\bazel-zig-cc goto zig :usertmp set ZIG_LOCAL_CACHE_DIR=%TMP%\\bazel-zig-cc :zig set ZIG_GLOBAL_CACHE_DIR=%ZIG_LOCAL_CACHE_DIR% "{zig}" "{zig_tool}" %* """ _ZIG_TOOL_WRAPPER_CACHE_KNOWN = """#!/bin/sh export ZIG_LOCAL_CACHE_DIR="{cache_prefix}/bazel-zig-cc" export ZIG_GLOBAL_CACHE_DIR="{cache_prefix}/bazel-zig-cc" exec "{zig}" "{zig_tool}" "$@" """ _ZIG_TOOL_WRAPPER_CACHE_GUESS = """#!/bin/sh set -e if [ -n "$TMPDIR" ]; then _cache_prefix=$TMPDIR elif [ -n "$HOME" ]; then if [ "$(uname)" = Darwin ]; then _cache_prefix="$HOME/Library/Caches" else _cache_prefix="$HOME/.cache" fi else _cache_prefix=/tmp fi export ZIG_LOCAL_CACHE_DIR="$_cache_prefix/bazel-zig-cc" export ZIG_GLOBAL_CACHE_DIR=$ZIG_LOCAL_CACHE_DIR exec "{zig}" "{zig_tool}" "$@" """ def _zig_tool_wrapper(zig_tool, zig, is_windows, cache_prefix): kwargs = dict( zig = str(zig).replace("/", "\\") + ".exe" if is_windows else zig, zig_tool = zig_tool, cache_prefix = cache_prefix, ) if is_windows: if cache_prefix: return _ZIG_TOOL_WRAPPER_WINDOWS_CACHE_KNOWN.format(**kwargs) else: return _ZIG_TOOL_WRAPPER_WINDOWS_CACHE_GUESS.format(**kwargs) elif cache_prefix: return _ZIG_TOOL_WRAPPER_CACHE_KNOWN.format(**kwargs) else: return _ZIG_TOOL_WRAPPER_CACHE_GUESS.format(**kwargs) def _quote(s): return "'" + s.replace("'", "'\\''") + "'" def _zig_repository_impl(repository_ctx): arch = repository_ctx.os.arch if arch == "amd64": arch = "x86_64" os = repository_ctx.os.name.lower() if os.startswith("mac os"): os = "macos" if os.startswith("windows"): os = "windows" host_platform = "{}-{}".format(os, arch) zig_include_root = repository_ctx.attr.host_platform_include_root[host_platform] zig_sha256 = repository_ctx.attr.host_platform_sha256[host_platform] zig_ext = repository_ctx.attr.host_platform_ext[host_platform] format_vars = { "_ext": zig_ext, "version": repository_ctx.attr.version, "host_platform": host_platform, } # Fetch Label dependencies before doing download/extract. # The Bazel docs are not very clear about this behavior but see: # https://bazel.build/extending/repo#when_is_the_implementation_function_executed # and a related rules_go PR: # https://github.com/bazelbuild/bazel-gazelle/pull/1206 for dest, src in { "platform/BUILD": "//toolchain/platform:BUILD", "toolchain/BUILD": "//toolchain/toolchain:BUILD", "libc/BUILD": "//toolchain/libc:BUILD", "libc_aware/platform/BUILD": "//toolchain/libc_aware/platform:BUILD", "libc_aware/toolchain/BUILD": "//toolchain/libc_aware/toolchain:BUILD", }.items(): repository_ctx.symlink(Label(src), dest) for dest, src in { "BUILD": "//toolchain:BUILD.sdk.bazel", "private/BUILD": "//toolchain/private:BUILD.sdk.bazel", }.items(): repository_ctx.template( dest, Label(src), executable = False, substitutions = { "{absolute_path}": _quote(str(repository_ctx.path(""))), "{os}": _quote(os), "{zig_include_root}": _quote(zig_include_root), }, ) urls = [uf.format(**format_vars) for uf in repository_ctx.attr.url_formats] repository_ctx.download_and_extract( auth = use_netrc(read_user_netrc(repository_ctx), urls, {}), url = urls, stripPrefix = "zig-{host_platform}-{version}/".format(**format_vars), sha256 = zig_sha256, ) for zig_tool in _ZIG_TOOLS: zig_tool_wrapper = _zig_tool_wrapper( zig_tool, str(repository_ctx.path("zig")), os == "windows", repository_ctx.os.environ.get("BAZEL_ZIG_CC_CACHE_PREFIX", ""), ) repository_ctx.file( zig_tool_path(os).format(zig_tool = zig_tool), zig_tool_wrapper, ) repository_ctx.file( "glibc-hacks/fcntl.map", content = _fcntl_map, ) repository_ctx.file( "glibc-hacks/glibchack-fcntl.h", content = _fcntl_h, ) zig_repository = repository_rule( attrs = { "version": attr.string(), "host_platform_sha256": attr.string_dict(), "url_formats": attr.string_list(allow_empty = False), "host_platform_include_root": attr.string_dict(), "host_platform_ext": attr.string_dict(), }, environ = ["BAZEL_ZIG_CC_CACHE_PREFIX"], implementation = _zig_repository_impl, ) def filegroup(name, **kwargs): native.filegroup(name = name, **kwargs) return ":" + name def declare_files(os, zig_include_root): filegroup(name = "empty") if os == "windows": native.exports_files(["zig.exe"], visibility = ["//visibility:public"]) native.alias(name = "zig", actual = ":zig.exe") else: native.exports_files(["zig"], visibility = ["//visibility:public"]) filegroup(name = "lib/std", srcs = native.glob(["lib/std/**"])) lazy_filegroups = {} for target_config in target_structs(): for d in DEFAULT_INCLUDE_DIRECTORIES + target_config.includes: d = zig_include_root + d if d not in lazy_filegroups: lazy_filegroups[d] = filegroup(name = d, srcs = native.glob([d + "/**"]))