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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", "target_structs", "zig_tool_path")
# Directories that `zig c++` includes behind the scenes.
_DEFAULT_INCLUDE_DIRECTORIES = [
"libcxx/include",
"libcxxabi/include",
"libunwind/include",
]
_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 = "0.11.0-dev.324+f61c5f3f5"
_HOST_PLATFORM_SHA256 = {
"linux-aarch64": "9d85f451e06eb246ba6ac11c20ea988f38de078e31c922b7919c599d097dcc17",
"linux-x86_64": "b8c2876d7012234b99dc0d772a39ef3223d65a20acd0d061c4be692375220af0",
"macos-aarch64": "50a7bf17e36f677d994f18f021fb8cdcd17faceb8504994a1083888601059606",
"macos-x86_64": "90360f529b8e103ac3538de9a27835bfb37a9f6b4b1e5581bcb23ec2c4cac2e6",
"windows-x86_64": "87669cc8bda2c6eef0f3c298ddd545d495e1d3554b787bd7ccbca144c5ef729a",
}
_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,
)
_ZIG_TOOLS = [
"c++",
"cc",
"ar",
"ld.lld", # ELF
"ld64.lld", # Mach-O
"lld-link", # COFF
"wasm-ld", # WebAssembly
"build-exe", # zig
"build-lib", # zig
"build-obj", # zig
]
_ZIG_TOOL_WRAPPER_WINDOWS_CACHE_KNOWN = """@echo off
if exist "external\\zig_sdk\\lib\\*" goto :have_external_zig_sdk_lib
set ZIG_LIB_DIR=%~dp0\\..\\..\\lib
goto :set_zig_lib_dir
:have_external_zig_sdk_lib
set ZIG_LIB_DIR=external\\zig_sdk\\lib
:set_zig_lib_dir
set ZIG_LOCAL_CACHE_DIR={cache_prefix}\\bazel-zig-cc
set ZIG_GLOBAL_CACHE_DIR=%ZIG_LOCAL_CACHE_DIR%
"{zig}" "{zig_tool}" {maybe_target} %*
"""
_ZIG_TOOL_WRAPPER_WINDOWS_CACHE_GUESS = """@echo off
if exist "external\\zig_sdk\\lib\\*" goto :have_external_zig_sdk_lib
set ZIG_LIB_DIR=%~dp0\\..\\..\\lib
goto :set_zig_lib_dir
:have_external_zig_sdk_lib
set ZIG_LIB_DIR=external\\zig_sdk\\lib
:set_zig_lib_dir
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}" {maybe_target} %*
"""
_ZIG_TOOL_WRAPPER_CACHE_KNOWN = """#!/bin/sh
set -e
if [ -d external/zig_sdk/lib ]; then
ZIG_LIB_DIR=external/zig_sdk/lib
else
ZIG_LIB_DIR="$(dirname "$0")/../../lib"
fi
export ZIG_LIB_DIR
export ZIG_LOCAL_CACHE_DIR="{cache_prefix}/bazel-zig-cc"
export ZIG_GLOBAL_CACHE_DIR="{cache_prefix}/bazel-zig-cc"
{maybe_gohack}
exec "{zig}" "{zig_tool}" {maybe_target} "$@"
"""
_ZIG_TOOL_WRAPPER_CACHE_GUESS = """#!/bin/sh
set -e
if [ -d external/zig_sdk/lib ]; then
ZIG_LIB_DIR=external/zig_sdk/lib
else
ZIG_LIB_DIR="$(dirname "$0")/../../lib"
fi
if [ -n "$TMPDIR" ]; then
_cache_prefix=$TMPDIR
elif [ -n "$HOME" ]; then
if [ "$(uname)" = Darwin ]; then
_cache_prefix="$HOME/Library/Caches"
else
_cache_prefix="$HOME/.cache"
fi
else
_cache_prefix=/tmp
fi
export ZIG_LIB_DIR
export ZIG_LOCAL_CACHE_DIR="$_cache_prefix/bazel-zig-cc"
export ZIG_GLOBAL_CACHE_DIR=$ZIG_LOCAL_CACHE_DIR
{maybe_gohack}
exec "{zig}" "{zig_tool}" {maybe_target} "$@"
"""
# The abomination below adds "-O2" to Go's link-prober command. Saves around
# 25s for the first compilation for a particular architecture. Can be deleted
# if/after https://go-review.googlesource.com/c/go/+/436884 is merged.
# Shell hackery taken from
# https://web.archive.org/web/20100129154217/http://www.seanius.net/blog/2009/03/saving-and-restoring-positional-params
_ZIG_TOOL_GOHACK = """
quote(){ echo "$1" | sed -e "s,','\\\\'',g"; }
for arg in "$@"; do saved="${saved:+$saved }'$(quote "$arg")'"; done
while [ "$#" -gt 6 ]; do shift; done
if [ "$*" = "-Wl,--no-gc-sections -x c - -o /dev/null" ]; then
# This command probes if `--no-gc-sections` is accepted by the linker.
# Since it is executed in /tmp, the ZIG_LIB_DIR is absolute,
# glibc stubs and libc++ cannot be shared with other invocations (which use
# a relative ZIG_LIB_DIR).
exit 0;
fi
eval set -- "$saved"
"""
def _zig_tool_wrapper(zig_tool, zig, is_windows, cache_prefix, zigtarget):
if zig_tool in ["c++", "build-exe", "build-lib", "build-obj"]:
maybe_target = "-target {}".format(zigtarget)
else:
maybe_target = ""
kwargs = dict(
zig = str(zig).replace("/", "\\") + ".exe" if is_windows else zig,
zig_tool = zig_tool,
cache_prefix = cache_prefix,
maybe_gohack = _ZIG_TOOL_GOHACK if (zig_tool == "c++" and not is_windows) else "",
maybe_target = maybe_target,
)
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)
else: # keep this comment to shut up buildifier.
if 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_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 = {
"{zig_sdk_path}": _quote("external/zig_sdk"),
"{os}": _quote(os),
},
)
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:
for target_config in target_structs():
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", ""),
zigtarget = target_config.zigtarget,
)
repository_ctx.file(
zig_tool_path(os).format(
zig_tool = zig_tool,
zigtarget = target_config.zigtarget,
),
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_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):
filegroup(name = "all", srcs = native.glob(["**"]))
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 = "lib/" + d
if d not in lazy_filegroups:
lazy_filegroups[d] = filegroup(name = d, srcs = native.glob([d + "/**"]))
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