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hermetic_cc_toolchain/toolchain/defs.bzl

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load("@bazel_skylib//lib:shell.bzl", "shell")
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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", "ZIG_TOOL_PATH", "target_structs")
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_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
"""
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# Official recommended version. Should use this when we have a usable release.
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
# 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}.tar.xz"
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# 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}.tar.xz"
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_VERSION = "0.10.0-dev.1393+291f5055f"
_HOST_PLATFORM_SHA256 = {
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"linux-aarch64": "10c6618f57f6253c047098aee4093fe36e7fc4da7f0ed2451cca91e8b84575b8",
"linux-x86_64": "de30008c98ba61791ab5caa78ec9fbe20c76f8e57c7a41e1cf5788d8f59b4c7e",
"macos-aarch64": "72edc26973d697bba68f138701ebf9755548677ecedd853fd224baa836bef2f8",
"macos-x86_64": "78220a4460a7c0f563d7365313fcd3ea028ed38166ebac55ba22f17ab6404851",
}
def register_toolchains(
register = [],
version = _VERSION,
url_formats = [URL_FORMAT_JAKSTYS],
host_platform_sha256 = _HOST_PLATFORM_SHA256):
"""
Download zig toolchain and register some.
@param register registers the given toolchains to the system using
native.register_toolchains(). See README for possible choices.
"""
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zig_repository(
name = "zig_sdk",
version = version,
url_formats = url_formats,
host_platform_sha256 = host_platform_sha256,
host_platform_include_root = {
"linux-aarch64": "lib/",
"linux-x86_64": "lib/",
"macos-aarch64": "lib/zig/",
"macos-x86_64": "lib/zig/",
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},
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)
toolchains = ["@zig_sdk//:toolchain:%s" % t for t in register]
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native.register_toolchains(*toolchains)
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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="$HOME/Library/Caches"
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fi
fi
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export ZIG_LOCAL_CACHE_DIR="$_cache_prefix/bazel-zig-cc"
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export ZIG_GLOBAL_CACHE_DIR=$ZIG_LOCAL_CACHE_DIR
exec "{zig}" "{zig_tool}" "$@"
"""
_ZIG_TOOLS = [
"c++",
"cc",
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"ar",
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"ld.lld", # ELF
"ld64.lld", # Mach-O
"lld-link", # COFF
"wasm-ld", # WebAssembly
]
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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"
host_platform = "{}-{}".format(os, arch)
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zig_include_root = repository_ctx.attr.host_platform_include_root[host_platform]
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,
"host_platform": host_platform,
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}
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urls = [uf.format(**format_vars) for uf in repository_ctx.attr.url_formats]
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repository_ctx.download_and_extract(
auth = use_netrc(read_user_netrc(repository_ctx), urls, {}),
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url = urls,
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stripPrefix = "zig-{host_platform}-{version}/".format(**format_vars),
sha256 = zig_sha256,
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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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)
repository_ctx.file(
"glibc-hacks/fcntl.map",
content = _fcntl_map,
)
repository_ctx.file(
"glibc-hacks/glibchack-fcntl.h",
content = _fcntl_h,
)
repository_ctx.symlink(
Label("//toolchain/platform:BUILD"),
"platform/BUILD",
)
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repository_ctx.template(
"BUILD",
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Label("//toolchain:BUILD.sdk.bazel"),
executable = False,
substitutions = {
"{zig_include_root}": shell.quote(zig_include_root),
},
)
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repository_ctx.symlink(
Label("//toolchain/toolchain:BUILD"),
"toolchain/BUILD",
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)
repository_ctx.template(
"private/BUILD",
Label("//toolchain/private:BUILD.sdk.bazel"),
executable = False,
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substitutions = {
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"{absolute_path}": shell.quote(str(repository_ctx.path(""))),
"{zig_include_root}": shell.quote(zig_include_root),
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},
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)
zig_repository = repository_rule(
attrs = {
"version": attr.string(),
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"host_platform_sha256": attr.string_dict(),
"url_formats": attr.string_list(allow_empty = False),
"host_platform_include_root": attr.string_dict(),
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},
implementation = _zig_repository_impl,
)
def filegroup(name, **kwargs):
native.filegroup(name = name, **kwargs)
return ":" + name
def declare_files(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 = {}
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 + "/**"]))