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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")
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load(":zig_toolchain.bzl", "zig_cc_toolchain_config")
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",
"nm": "/usr/bin/false",
"objdump": "/usr/bin/false",
"strip": "/usr/bin/false",
}.items()
DEFAULT_INCLUDE_DIRECTORIES = [
"include",
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"libcxx/include",
"libcxxabi/include",
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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
"""
# Zig supports even older glibcs than defined below, but we have tested only
# down to 2.17.
# $ zig targets | jq -r '.glibc[]' | sort -V
_GLIBCS = [
"2.17",
"2.18",
"2.19",
"2.22",
"2.23",
"2.24",
"2.25",
"2.26",
"2.27",
"2.28",
"2.29",
"2.30",
"2.31",
"2.32",
"2.33",
"2.34",
]
def _target_darwin(gocpu, zigcpu):
min_os = "10"
if zigcpu == "aarch64":
min_os = "11"
return struct(
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gotarget = "darwin_{}".format(gocpu),
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zigtarget = "{}-macos-gnu".format(zigcpu),
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includes = [
"libunwind/include",
# TODO: Define a toolchain for each minimum OS version
"libc/include/{}-macos.{}-gnu".format(zigcpu, min_os),
"libc/include/any-macos.{}-any".format(min_os),
"libc/include/any-macos-any",
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],
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linkopts = [],
copts = [],
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bazel_target_cpu = "darwin",
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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def _target_linux_gnu(gocpu, zigcpu, glibc_version = ""):
glibc_suffix = "gnu"
if glibc_version != "":
glibc_suffix = "gnu.{}".format(glibc_version)
# https://github.com/ziglang/zig/issues/5882#issuecomment-888250676
# fcntl_hack is only required for glibc 2.27 or less. We assume that
# glibc_version == "" (autodetect) is running a recent glibc version, thus
# adding this hack only when glibc is explicitly 2.27 or lower.
fcntl_hack = False
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if glibc_version == "":
# zig doesn't reliably detect the glibc version, so
# often falls back to 2.17; the hack should be included.
# https://github.com/ziglang/zig/issues/6469
fcntl_hack = True
else:
# hack is required for 2.27 or less.
fcntl_hack = glibc_version < "2.28"
return struct(
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gotarget = "linux_{}_{}".format(gocpu, glibc_suffix),
zigtarget = "{}-linux-{}".format(zigcpu, glibc_suffix),
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includes = [
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"libunwind/include",
"libc/include/generic-glibc",
"libc/include/any-linux-any",
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"libc/include/{}-linux-gnu".format(zigcpu),
"libc/include/{}-linux-any".format(zigcpu),
] + (["libc/include/x86-linux-any"] if zigcpu == "x86_64" else []),
toplevel_include = ["glibc-hacks"] if fcntl_hack else [],
compiler_extra_includes = ["glibc-hacks/glibchack-fcntl.h"] if fcntl_hack else [],
linker_version_scripts = ["glibc-hacks/fcntl.map"] if fcntl_hack else [],
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linkopts = ["-lc++", "-lc++abi"],
copts = [],
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bazel_target_cpu = "k8",
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"},
)
def _target_linux_musl(gocpu, zigcpu):
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",
"libc/include/any-linux-any",
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"libc/include/{}-linux-musl".format(zigcpu),
"libc/include/{}-linux-any".format(zigcpu),
] + (["libc/include/x86-linux-any"] if zigcpu == "x86_64" else []),
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linkopts = ["-s", "-w"],
copts = ["-D_LIBCPP_HAS_MUSL_LIBC", "-D_LIBCPP_HAS_THREAD_API_PTHREAD"],
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bazel_target_cpu = "k8",
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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# 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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)
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toolchains = ["@zig_sdk//:%s_toolchain" % t for t in register]
native.register_toolchains(*toolchains)
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ZIG_TOOL_PATH = "tools/{zig_tool}"
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,
)
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repository_ctx.template(
"BUILD.bazel",
Label("//toolchain:BUILD.sdk.bazel"),
executable = False,
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,
)
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def _target_structs():
ret = []
for zigcpu, gocpu in (("x86_64", "amd64"), ("aarch64", "arm64")):
ret.append(_target_darwin(gocpu, zigcpu))
ret.append(_target_linux_musl(gocpu, zigcpu))
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for glibc in [""] + _GLIBCS:
ret.append(_target_linux_gnu(gocpu, zigcpu, glibc))
return ret
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def filegroup(name, **kwargs):
native.filegroup(name = name, **kwargs)
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 = []
for d in DEFAULT_INCLUDE_DIRECTORIES + target_config.includes:
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)
for d in getattr(target_config, "toplevel_include", []):
cxx_builtin_include_directories.append(absolute_path + "/" + d)
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absolute_tool_paths = {}
for name, path in target_config.tool_paths.items() + DEFAULT_TOOL_PATHS:
if path[0] == "/":
absolute_tool_paths[name] = path
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)
linkopts = target_config.linkopts
copts = target_config.copts
for s in getattr(target_config, "linker_version_scripts", []):
linkopts = linkopts + ["-Wl,--version-script,%s/%s" % (absolute_path, s)]
for incl in getattr(target_config, "compiler_extra_includes", []):
copts = copts + ["-include", absolute_path + "/" + incl]
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zig_cc_toolchain_config(
name = zigtarget + "_toolchain_cc_config",
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target = zigtarget,
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tool_paths = absolute_tool_paths,
cxx_builtin_include_directories = cxx_builtin_include_directories,
copts = copts,
linkopts = linkopts,
target_cpu = target_config.bazel_target_cpu,
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target_system_name = "unknown",
target_libc = "unknown",
compiler = "clang",
abi_version = "unknown",
abi_libc_version = "unknown",
)
native.cc_toolchain(
name = zigtarget + "_toolchain_cc",
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toolchain_identifier = zigtarget + "-toolchain",
toolchain_config = ":%s_toolchain_cc_config" % zigtarget,
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all_files = ":zig",
ar_files = ":zig",
compiler_files = ":zig",
linker_files = ":zig",
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dwp_files = ":empty",
objcopy_files = ":empty",
strip_files = ":empty",
supports_param_files = 0,
)
# register two kinds of toolchain targets: Go and Zig conventions.
# 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,
target_compatible_with = target_config.constraint_values,
toolchain = ":%s_toolchain_cc" % zigtarget,
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toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
)
# Zig convention: x86_64/aarch64, linux/macos
native.toolchain(
name = zigtarget + "_toolchain",
exec_compatible_with = None,
target_compatible_with = target_config.constraint_values,
toolchain = ":%s_toolchain_cc" % zigtarget,
toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
)
# create @zig_sdk//{os}_{arch}_platform entries with zig and go conventions
for zigcpu, gocpu in (("x86_64", "amd64"), ("aarch64", "arm64")):
for bzlos, oss in {"linux": ["linux"], "macos": ["macos", "darwin"]}.items():
for os in oss:
constraint_values = [
"@platforms//os:{}".format(bzlos),
"@platforms//cpu:{}".format(zigcpu),
]
native.platform(
name = "{os}_{zigcpu}_platform".format(os = os, zigcpu = zigcpu),
constraint_values = constraint_values,
)
native.platform(
name = "{os}_{gocpu}_platform".format(os = os, gocpu = gocpu),
constraint_values = constraint_values,
)