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hermetic_cc_toolchain/toolchain/defs.bzl

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9.7 KiB
Python

load("@bazel_skylib//lib:shell.bzl", "shell")
load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
load(":zig_toolchain.bzl", "zig_cc_toolchain_config")
DEFAULT_TOOL_PATHS = {
"ar": "ar",
"gcc": "c++", # https://github.com/bazelbuild/bazel/issues/4644
"cpp": "/usr/bin/false",
"gcov": "/usr/bin/false",
"nm": "/usr/bin/false",
"objdump": "/usr/bin/false",
"strip": "/usr/bin/false",
}.items()
DEFAULT_INCLUDE_DIRECTORIES = [
"include",
"libcxx/include",
"libcxxabi/include",
]
# https://github.com/ziglang/zig/issues/5882#issuecomment-888250676
# only required for glibc 2.27 or lower.
_fcntl_map = """
GLIBC_2.2.5 {
fcntl;
};
"""
_fcntl_h = """asm (".symver fcntl64, fcntl@GLIBC_2.2.5");\n"""
# https://github.com/ziglang/zig/blob/0cfa39304b18c6a04689bd789f5dc4d035ec43b0/src/main.zig#L2962-L2966
TARGET_CONFIGS_LISTOFLISTS = [[
struct(
gotarget = "darwin_{}".format(gocpu),
zigtarget = "{}-macos-gnu".format(zigcpu),
includes = [
"libunwind/include",
"libc/include/any-macos-any",
"libc/include/{}-macos-any".format(zigcpu),
"libc/include/{}-macos-gnu".format(zigcpu),
],
linkopts = [],
copts = [],
bazel_target_cpu = "darwin",
constraint_values = [
"@platforms//os:macos",
"@platforms//cpu:{}".format(zigcpu),
],
tool_paths = {"ld": "ld64.lld"},
register = True,
),
struct(
gotarget = "linux_{}_gnu".format(gocpu),
zigtarget = "{}-linux-gnu".format(zigcpu),
target_suffix = ".2.19", # use 2.19 for jessie.
includes = [
"libunwind/include",
"libc/include/generic-glibc",
"libc/include/any-linux-any",
"libc/include/{}-linux-gnu".format(zigcpu),
"libc/include/{}-linux-any".format(zigcpu),
],
linker_version_script = "glibc-hacks/fcntl.map",
compiler_extra_include = "glibc-hacks/fcntl.h",
linkopts = ["-lc++", "-lc++abi"],
copts = [],
bazel_target_cpu = "k8",
constraint_values = [
"@platforms//os:linux",
"@platforms//cpu:{}".format(zigcpu),
],
tool_paths = {"ld": "ld.lld"},
register = True,
),
struct(
gotarget = "linux_{}_musl".format(gocpu),
zigtarget = "{}-linux-musl".format(zigcpu),
includes = [
"libc/include/generic-musl",
"libc/include/any-linux-any",
"libc/include/{}-linux-musl".format(zigcpu),
"libc/include/{}-linux-any".format(zigcpu),
],
linkopts = ["-s", "-w"],
copts = ["-D_LIBCPP_HAS_MUSL_LIBC", "-D_LIBCPP_HAS_THREAD_API_PTHREAD"],
bazel_target_cpu = "k8",
constraint_values = [
"@platforms//os:linux",
"@platforms//cpu:{}".format(zigcpu),
],
tool_paths = {"ld": "ld.lld"},
register = False,
),
] for zigcpu, gocpu in (("x86_64", "amd64"), ("aarch64", "arm64"))]
TARGET_CONFIGS = [val for sublist in TARGET_CONFIGS_LISTOFLISTS for val in sublist]
def toolchain_repositories():
zig_repository(
name = "zig_sdk",
# Pre-release:
version = "0.9.0-dev.347+628f490c5",
url_format = "https://ziglang.org/builds/zig-{host_platform}-{version}.tar.xz",
# Release:
# version = "0.8.0",
# url_format = "https://ziglang.org/download/{version}/zig-{host_platform}-{version}.tar.xz",
host_platform_sha256 = {
"linux-x86_64": "163b2bdaf5464fcb94033c35737ec7c463bee4509e6970f19cfddb5bd90b2471",
"macos-x86_64": "aa17c52c260b09328df8efd9b44f9197320a3d7b4d5c7025a715fc8ffe23ca35",
},
host_platform_include_root = {
"macos-x86_64": "lib/zig/",
"linux-x86_64": "lib/",
},
)
def register_all_toolchains():
for target_config in TARGET_CONFIGS:
if target_config.register:
native.register_toolchains(
"@zig_sdk//:%s_toolchain" % target_config.gotarget,
)
ZIG_TOOL_PATH = "tools/{zig_tool}"
ZIG_TOOL_WRAPPER = """#!/bin/bash
if [[ -n "$TMPDIR" ]]; then
cache_prefix=$TMPDIR
else
cache_prefix="$HOME/.cache"
if [[ "$(uname)" = Darwin ]]; then
cache_prefix="$HOME/Library/Caches"
fi
fi
export ZIG_LOCAL_CACHE_DIR="$cache_prefix/bazel-zig-cc"
export ZIG_GLOBAL_CACHE_DIR=$ZIG_LOCAL_CACHE_DIR
exec "{zig}" "{zig_tool}" "$@"
"""
ZIG_TOOLS = [
"c++",
"cc",
"ar",
# List of ld tools: https://github.com/ziglang/zig/blob/0cfa39304b18c6a04689bd789f5dc4d035ec43b0/src/main.zig#L2962-L2966
# and also: https://github.com/ziglang/zig/issues/3257
"ld.lld", # ELF
"ld64.lld", # Mach-O
"lld-link", # COFF
"wasm-ld", # WebAssembly
]
def _zig_repository_impl(repository_ctx):
if repository_ctx.os.name.lower().startswith("mac os"):
host_platform = "macos-x86_64"
else:
host_platform = "linux-x86_64"
zig_include_root = repository_ctx.attr.host_platform_include_root[host_platform]
zig_sha256 = repository_ctx.attr.host_platform_sha256[host_platform]
format_vars = {
"version": repository_ctx.attr.version,
"host_platform": host_platform,
}
zig_url = repository_ctx.attr.url_format.format(**format_vars)
repository_ctx.download_and_extract(
url = zig_url,
stripPrefix = "zig-{host_platform}-{version}/".format(**format_vars),
sha256 = zig_sha256,
)
for zig_tool in ZIG_TOOLS:
repository_ctx.file(
ZIG_TOOL_PATH.format(zig_tool = zig_tool),
ZIG_TOOL_WRAPPER.format(zig = str(repository_ctx.path("zig")), zig_tool = zig_tool),
)
repository_ctx.file(
"glibc-hacks/fcntl.map",
content = _fcntl_map,
)
repository_ctx.file(
"glibc-hacks/fcntl.h",
content = _fcntl_h,
)
repository_ctx.template(
"BUILD.bazel",
Label("//toolchain:BUILD.sdk.bazel"),
executable = False,
substitutions = {
"{absolute_path}": shell.quote(str(repository_ctx.path(""))),
"{zig_include_root}": shell.quote(zig_include_root),
},
)
zig_repository = repository_rule(
attrs = {
"version": attr.string(),
"host_platform_sha256": attr.string_dict(),
"url_format": attr.string(),
"host_platform_include_root": attr.string_dict(),
},
implementation = _zig_repository_impl,
)
def filegroup(name, **kwargs):
native.filegroup(name = name, **kwargs)
return ":" + name
def zig_build_macro(absolute_path, zig_include_root):
filegroup(name = "empty")
native.exports_files(["zig"], visibility = ["//visibility:public"])
filegroup(name = "lib/std", srcs = native.glob(["lib/std/**"]))
lazy_filegroups = {}
for target_config in TARGET_CONFIGS:
gotarget = target_config.gotarget
zigtarget = target_config.zigtarget
native.platform(
name = gotarget,
constraint_values = target_config.constraint_values,
)
cxx_builtin_include_directories = []
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 + "/**"]))
cxx_builtin_include_directories.append(absolute_path + "/" + d)
absolute_tool_paths = {}
for name, path in target_config.tool_paths.items() + DEFAULT_TOOL_PATHS:
if path[0] == "/":
absolute_tool_paths[name] = path
continue
tool_path = ZIG_TOOL_PATH.format(zig_tool = path)
absolute_tool_paths[name] = "%s/%s" % (absolute_path, tool_path)
linkopts = target_config.linkopts
copts = target_config.copts
compiler_extra_include = getattr(target_config, "compiler_extra_include", None)
linker_version_script = getattr(target_config, "linker_version_script", None)
if linker_version_script:
linkopts = linkopts + ["-Wl,--version-script,%s/%s" % (absolute_path, linker_version_script)]
if compiler_extra_include:
copts = copts + ["-include", "%s/%s" % (absolute_path, compiler_extra_include)]
zig_cc_toolchain_config(
name = zigtarget + "_cc_toolchain_config",
target = zigtarget,
target_suffix = getattr(target_config, "target_suffix", ""),
tool_paths = absolute_tool_paths,
cxx_builtin_include_directories = cxx_builtin_include_directories,
copts = copts,
linkopts = linkopts,
target_cpu = target_config.bazel_target_cpu,
target_system_name = "unknown",
target_libc = "unknown",
compiler = "clang",
abi_version = "unknown",
abi_libc_version = "unknown",
)
native.cc_toolchain(
name = zigtarget + "_cc_toolchain",
toolchain_identifier = zigtarget + "-toolchain",
toolchain_config = ":%s_cc_toolchain_config" % zigtarget,
all_files = ":zig",
ar_files = ":zig",
compiler_files = ":zig",
linker_files = ":zig",
dwp_files = ":empty",
objcopy_files = ":empty",
strip_files = ":empty",
supports_param_files = 0,
)
native.toolchain(
name = gotarget + "_toolchain",
exec_compatible_with = None,
target_compatible_with = target_config.constraint_values,
toolchain = ":%s_cc_toolchain" % zigtarget,
toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
)