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hermetic_cc_toolchain
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hermetic_cc_toolchain/toolchain/defs.bzl

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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", "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.3838+77f31ebbb"
_HOST_PLATFORM_SHA256 = {
"linux-aarch64": "33ec5b5f2b8cfe2050786b173d3027c95cc0ad43b0501bf07f6f067f1b98c80a",
"linux-x86_64": "a9a6ab59e70017fe33d1fc3f366383825941fe2f97e12ff4d54c9ef1d5c9accf",
"macos-aarch64": "9e45cde60b8894968b868e910eb9b6649b50add9c0febfd9860da0180a1d44d3",
"macos-x86_64": "62747d1e923fb59a59e5d7c1d3ca85b4d5f16708233baecb1182c2a001d8a8f3",
"windows-x86_64": "2b1f3316421edc59609fd2380352ff1f6aa1cbc6e5232c478c9872a6c3cf13a7",
}
_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/zig/",
"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,
}
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,
)
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),
},
)
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 + "/**"]))
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