379 lines
13 KiB
Python
379 lines
13 KiB
Python
load("@bazel_skylib//lib:shell.bzl", "shell")
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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": "ar",
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"gcc": "c++", # https://github.com/bazelbuild/bazel/issues/4644
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"cpp": "/usr/bin/false",
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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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]
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_fcntl_map = """
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GLIBC_2.2.5 {
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fcntl;
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};
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"""
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_fcntl_h = """
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#ifdef __ASSEMBLER__
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.symver fcntl64, fcntl@GLIBC_2.2.5
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#else
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__asm__(".symver fcntl64, fcntl@GLIBC_2.2.5");
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#endif
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"""
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# Zig supports even older glibcs than defined below, but we have tested only
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# down to 2.17.
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# $ zig targets | jq -r '.glibc[]' | sort -V
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_GLIBCS = [
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"2.17",
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"2.18",
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"2.19",
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"2.22",
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"2.23",
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"2.24",
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"2.25",
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"2.26",
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"2.27",
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"2.28",
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"2.29",
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"2.30",
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"2.31",
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"2.32",
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"2.33",
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"2.34",
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]
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def _target_darwin(gocpu, zigcpu):
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return struct(
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gotarget = "darwin_{}".format(gocpu),
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zigtarget = "{}-macos-gnu".format(zigcpu),
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includes = [
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"libunwind/include",
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# FIXME: add macos.10, macos.11 and macos.12 targets,
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# and adjust the includes
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"libc/include/{}-macos.10-gnu".format(zigcpu),
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"libc/include/{}-macos-any".format(zigcpu),
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"libc/include/any-macos-any",
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],
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linkopts = [],
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copts = [],
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bazel_target_cpu = "darwin",
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constraint_values = [
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"@platforms//os:macos",
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"@platforms//cpu:{}".format(zigcpu),
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],
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tool_paths = {"ld": "ld64.lld"},
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)
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def _target_linux_gnu(gocpu, zigcpu, glibc_version = ""):
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glibc_suffix = "gnu"
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if glibc_version != "":
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glibc_suffix = "gnu.{}".format(glibc_version)
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# https://github.com/ziglang/zig/issues/5882#issuecomment-888250676
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# fcntl_hack is only required for glibc 2.27 or less. We assume that
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# glibc_version == "" (autodetect) is running a recent glibc version, thus
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# adding this hack only when glibc is explicitly 2.27 or lower.
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fcntl_hack = False
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if glibc_version == "":
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# zig doesn't reliably detect the glibc version, so
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# often falls back to 2.17; the hack should be included.
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# https://github.com/ziglang/zig/issues/6469
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fcntl_hack = True
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else:
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# hack is required for 2.27 or less.
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fcntl_hack = glibc_version < "2.28"
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return struct(
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gotarget = "linux_{}_{}".format(gocpu, glibc_suffix),
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zigtarget = "{}-linux-{}".format(zigcpu, glibc_suffix),
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includes = [
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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/{}-linux-gnu".format(zigcpu),
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"libc/include/{}-linux-any".format(zigcpu),
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] + (["libc/include/x86-linux-any"] if zigcpu == "x86_64" else []),
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toplevel_include = ["glibc-hacks"] if fcntl_hack else [],
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compiler_extra_includes = ["glibc-hacks/glibchack-fcntl.h"] if fcntl_hack else [],
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linker_version_scripts = ["glibc-hacks/fcntl.map"] if fcntl_hack else [],
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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 = [
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"@platforms//os:linux",
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"@platforms//cpu:{}".format(zigcpu),
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],
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tool_paths = {"ld": "ld.lld"},
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)
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def _target_linux_musl(gocpu, zigcpu):
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return struct(
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gotarget = "linux_{}_musl".format(gocpu),
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zigtarget = "{}-linux-musl".format(zigcpu),
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includes = [
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"libc/include/generic-musl",
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"libc/include/any-linux-any",
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"libc/include/{}-linux-musl".format(zigcpu),
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"libc/include/{}-linux-any".format(zigcpu),
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] + (["libc/include/x86-linux-any"] if zigcpu == "x86_64" else []),
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linkopts = ["-s", "-w"],
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copts = ["-D_LIBCPP_HAS_MUSL_LIBC", "-D_LIBCPP_HAS_THREAD_API_PTHREAD"],
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bazel_target_cpu = "k8",
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constraint_values = [
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"@platforms//os:linux",
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"@platforms//cpu:{}".format(zigcpu),
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],
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tool_paths = {"ld": "ld.lld"},
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)
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# Official recommended version. Should use this when we have a usable release.
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_URL_FORMAT_RELEASE = "https://ziglang.org/download/{version}/zig-{host_platform}-{version}.tar.xz"
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# Caution: nightly releases are purged from ziglang.org after ~90 days. A real
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# solution would be to allow the downstream project specify their own mirrors.
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# This is explained in
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# https://sr.ht/~motiejus/bazel-zig-cc/#alternative-download-urls and is
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# awaiting my attention or your contribution.
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_URL_FORMAT_NIGHTLY = "https://ziglang.org/builds/zig-{host_platform}-{version}.tar.xz"
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# Author's mirror that doesn't purge the nightlies so aggressively. I will be
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# cleaning those up manually only after the artifacts are not in use for many
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# months in bazel-zig-cc. dl.jakstys.lt is a small x86_64 server with an NVMe
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# drive sitting in my home closet on a 1GB/s symmetric residential connection,
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# which, as of writing, has been quite reliable.
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_URL_FORMAT_JAKSTYS = "https://dl.jakstys.lt/zig/zig-{host_platform}-{version}.tar.xz"
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_VERSION = "0.10.0-dev.513+029844210"
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def register_toolchains(
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register = [],
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version = _VERSION,
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url_format = _URL_FORMAT_JAKSTYS,
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host_platform_sha256 = {}):
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"""
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Download zig toolchain and register some.
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@param register registers the given toolchains to the system using
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native.register_toolchains(). See README for possible choices.
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"""
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sha256s = {
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"linux-aarch64": "fc0b929948d57d1b15aaac33db0cd136a1f79830926c9285fd3f5b6445f1ef95",
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"linux-x86_64": "c6f323b02b0bcf7b18143983bf2525640dd541f39af661e963823c9a61a09b28",
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"macos-aarch64": "0ccd8dad1264474ca824d45c3021b7e549b67792fa1a66cb9d4d7040775319bb",
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"macos-x86_64": "3c939bebe8648c277ee66d1c600e68576e382d0309dc29eb4c32aba96b83f6f0",
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}
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sha256s.update(host_platform_sha256)
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zig_repository(
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name = "zig_sdk",
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version = version,
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url_format = url_format,
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host_platform_sha256 = sha256s,
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host_platform_include_root = {
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"linux-aarch64": "lib/",
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"linux-x86_64": "lib/",
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"macos-aarch64": "lib/zig/",
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"macos-x86_64": "lib/zig/",
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},
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)
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toolchains = ["@zig_sdk//:%s_toolchain" % t for t in register]
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native.register_toolchains(*toolchains)
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ZIG_TOOL_PATH = "tools/{zig_tool}"
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ZIG_TOOL_WRAPPER = """#!/bin/bash
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set -e
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if [[ -n "$TMPDIR" ]]; then
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_cache_prefix=$TMPDIR
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else
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_cache_prefix="$HOME/.cache"
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if [[ "$(uname)" = Darwin ]]; then
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_cache_prefix="$HOME/Library/Caches"
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fi
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fi
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export ZIG_LOCAL_CACHE_DIR="$_cache_prefix/bazel-zig-cc"
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export ZIG_GLOBAL_CACHE_DIR=$ZIG_LOCAL_CACHE_DIR
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exec "{zig}" "{zig_tool}" "$@"
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"""
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_ZIG_TOOLS = [
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"c++",
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"cc",
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"ar",
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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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def _zig_repository_impl(repository_ctx):
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res = repository_ctx.execute(["uname", "-m"])
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if res.return_code != 0:
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fail("failed to run uname -m")
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uname = res.stdout.strip()
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if repository_ctx.os.name.lower().startswith("mac os"):
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host_platform = "macos-{}".format(uname)
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else:
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host_platform = "linux-{}".format(uname)
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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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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(
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zig = str(repository_ctx.path("zig")),
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zig_tool = zig_tool,
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),
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)
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repository_ctx.file(
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"glibc-hacks/fcntl.map",
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content = _fcntl_map,
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)
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repository_ctx.file(
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"glibc-hacks/glibchack-fcntl.h",
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content = _fcntl_h,
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)
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repository_ctx.template(
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"BUILD.bazel",
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Label("//toolchain:BUILD.sdk.bazel"),
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executable = False,
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substitutions = {
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"{absolute_path}": shell.quote(str(repository_ctx.path(""))),
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"{zig_include_root}": shell.quote(zig_include_root),
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},
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)
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zig_repository = repository_rule(
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attrs = {
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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 _target_structs():
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ret = []
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for zigcpu, gocpu in (("x86_64", "amd64"), ("aarch64", "arm64")):
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ret.append(_target_darwin(gocpu, zigcpu))
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ret.append(_target_linux_musl(gocpu, zigcpu))
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for glibc in [""] + _GLIBCS:
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ret.append(_target_linux_gnu(gocpu, zigcpu, glibc))
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return ret
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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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native.exports_files(["zig"], visibility = ["//visibility:public"])
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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_structs():
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gotarget = target_config.gotarget
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zigtarget = target_config.zigtarget
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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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cxx_builtin_include_directories.append(absolute_path + "/" + d)
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for d in getattr(target_config, "toplevel_include", []):
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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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linkopts = target_config.linkopts
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copts = target_config.copts
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for s in getattr(target_config, "linker_version_scripts", []):
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linkopts = linkopts + ["-Wl,--version-script,%s/%s" % (absolute_path, s)]
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for incl in getattr(target_config, "compiler_extra_includes", []):
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copts = copts + ["-include", absolute_path + "/" + incl]
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zig_cc_toolchain_config(
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name = zigtarget + "_toolchain_cc_config",
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target = zigtarget,
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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 = copts,
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linkopts = linkopts,
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target_cpu = target_config.bazel_target_cpu,
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target_system_name = "unknown",
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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 = zigtarget + "_toolchain_cc",
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toolchain_identifier = zigtarget + "-toolchain",
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toolchain_config = ":%s_toolchain_cc_config" % zigtarget,
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all_files = ":zig",
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ar_files = ":zig",
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compiler_files = ":zig",
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linker_files = ":zig",
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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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# register two kinds of toolchain targets: Go and Zig conventions.
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# Go convention: amd64/arm64, linux/darwin
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native.toolchain(
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name = gotarget + "_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_toolchain_cc" % zigtarget,
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toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
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)
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# Zig convention: x86_64/aarch64, linux/macos
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native.toolchain(
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name = zigtarget + "_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_toolchain_cc" % zigtarget,
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toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
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)
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