337 lines
12 KiB
Python
337 lines
12 KiB
Python
load("@bazel_skylib//lib:paths.bzl", "paths")
|
|
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",
|
|
]
|
|
|
|
# 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}"
|
|
|
|
# Official Bazel's mirror with selected Zig SDK versions. Bazel community is
|
|
# generous enough to host the artifacts, which we use.
|
|
URL_FORMAT_BAZELMIRROR = "https://mirror.bazel.build/" + URL_FORMAT_NIGHTLY.lstrip("https://")
|
|
|
|
_VERSION = "0.11.0-dev.1796+c9e02d3e6"
|
|
|
|
_HOST_PLATFORM_SHA256 = {
|
|
"linux-aarch64": "5902b34b463635b25c11555650d095eb5030e2a05d8a4570c091313cd1a38b12",
|
|
"linux-x86_64": "aa9da2305fad89f648db2fd1fade9f0f9daf01d06f3b07887ad3098402794778",
|
|
"macos-aarch64": "51b4e88123d6cbb102f2a6665dd0d61467341f36b07bb0a8d46a37ea367b60d5",
|
|
"macos-x86_64": "dd8eeae5249aa21f9e51ff4ff536a3e7bf2c0686ee78bf6032d18e74c8416c56",
|
|
"windows-x86_64": "260f34d0d5312d2642097bb33c14ac552cd57c59a15383364df6764d01f0bfc9",
|
|
}
|
|
|
|
_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",
|
|
}
|
|
|
|
_compile_failed = """
|
|
Compilation of launcher.zig failed:
|
|
command={compile_cmd}
|
|
return_code={return_code}
|
|
stderr={stderr}
|
|
stdout={stdout}
|
|
|
|
You most likely hit a rare but known race in Zig SDK. Congratulations?
|
|
|
|
We are working on fixing it with Zig Software Foundation. If you are curious,
|
|
feel free to follow along in https://github.com/ziglang/zig/issues/14815
|
|
|
|
There isn't much to do now but wait. Now apply the following workaround:
|
|
$ rm -fr {cache_prefix}
|
|
$ <... re-run your command ...>
|
|
|
|
... and proceed with your life.
|
|
"""
|
|
|
|
def toolchains(
|
|
version = _VERSION,
|
|
url_formats = [URL_FORMAT_BAZELMIRROR, URL_FORMAT_NIGHTLY],
|
|
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++",
|
|
"ar",
|
|
]
|
|
|
|
_template_mapfile = """
|
|
%s {
|
|
%s;
|
|
};
|
|
"""
|
|
|
|
_template_linker = """
|
|
#ifdef __ASSEMBLER__
|
|
.symver {from_function}, {to_function_abi}
|
|
#else
|
|
__asm__(".symver {from_function}, {to_function_abi}");
|
|
#endif
|
|
"""
|
|
|
|
def _glibc_hack(from_function, to_function_abi):
|
|
# Cannot use .format(...) here, because starlark thinks
|
|
# that the byte 3 (the opening brace on the first line)
|
|
# is a nested { ... }, returning an error:
|
|
# Error in format: Nested replacement fields are not supported
|
|
to_function, to_abi = to_function_abi.split("@")
|
|
mapfile = _template_mapfile % (to_abi, to_function)
|
|
header = _template_linker.format(
|
|
from_function = from_function,
|
|
to_function_abi = to_function_abi,
|
|
)
|
|
return struct(
|
|
mapfile = mapfile,
|
|
header = header,
|
|
)
|
|
|
|
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,
|
|
)
|
|
|
|
cache_prefix = repository_ctx.os.environ.get("BAZEL_ZIG_CC_CACHE_PREFIX", "")
|
|
if cache_prefix == "":
|
|
if os == "windows":
|
|
cache_prefix = "C:\\\\Temp\\\\bazel-zig-cc"
|
|
else:
|
|
cache_prefix = "/tmp/bazel-zig-cc"
|
|
|
|
repository_ctx.template(
|
|
"tools/launcher.zig",
|
|
Label("//toolchain:launcher.zig"),
|
|
executable = False,
|
|
substitutions = {
|
|
"{BAZEL_ZIG_CC_CACHE_PREFIX}": cache_prefix,
|
|
},
|
|
)
|
|
|
|
compile_env = {
|
|
"ZIG_LOCAL_CACHE_DIR": cache_prefix,
|
|
"ZIG_GLOBAL_CACHE_DIR": cache_prefix,
|
|
}
|
|
compile_cmd = [
|
|
paths.join("..", "zig"),
|
|
"build-exe",
|
|
"-OReleaseSafe",
|
|
"launcher.zig",
|
|
] + (["-static"] if os == "linux" else [])
|
|
|
|
ret = repository_ctx.execute(
|
|
compile_cmd,
|
|
working_directory = "tools",
|
|
environment = compile_env,
|
|
)
|
|
if ret.return_code != 0:
|
|
full_cmd = [k + "=" + v for k, v in compile_env.items()] + compile_cmd
|
|
fail(_compile_failed.format(
|
|
compile_cmd = " ".join(full_cmd),
|
|
return_code = ret.return_code,
|
|
stdout = ret.stdout,
|
|
stderr = ret.stderr,
|
|
cache_prefix = cache_prefix,
|
|
))
|
|
|
|
exe = ".exe" if os == "windows" else ""
|
|
for target_config in target_structs():
|
|
for zig_tool in _ZIG_TOOLS + target_config.tool_paths.values():
|
|
tool_path = zig_tool_path(os).format(
|
|
zig_tool = zig_tool,
|
|
zigtarget = target_config.zigtarget,
|
|
)
|
|
repository_ctx.symlink("tools/launcher{}".format(exe), tool_path)
|
|
|
|
fcntl_hack = _glibc_hack("fcntl64", "fcntl@GLIBC_2.2.5")
|
|
repository_ctx.file("glibc-hacks/fcntl.map", content = fcntl_hack.mapfile)
|
|
repository_ctx.file("glibc-hacks/fcntl.h", content = fcntl_hack.header)
|
|
res_search_amd64 = _glibc_hack("res_search", "__res_search@GLIBC_2.2.5")
|
|
repository_ctx.file("glibc-hacks/res_search-amd64.map", content = res_search_amd64.mapfile)
|
|
repository_ctx.file("glibc-hacks/res_search-amd64.h", content = res_search_amd64.header)
|
|
res_search_arm64 = _glibc_hack("res_search", "__res_search@GLIBC_2.17")
|
|
repository_ctx.file("glibc-hacks/res_search-arm64.map", content = res_search_arm64.mapfile)
|
|
repository_ctx.file("glibc-hacks/res_search-arm64.h", content = res_search_arm64.header)
|
|
|
|
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():
|
|
all_includes = [native.glob(["lib/{}/**".format(i)]) for i in target_config.includes]
|
|
all_includes.append(getattr(target_config, "compiler_extra_includes", []))
|
|
|
|
cxx_tool_label = ":" + zig_tool_path(os).format(
|
|
zig_tool = "c++",
|
|
zigtarget = target_config.zigtarget,
|
|
)
|
|
|
|
filegroup(
|
|
name = "{}_includes".format(target_config.zigtarget),
|
|
srcs = _flatten(all_includes),
|
|
)
|
|
|
|
filegroup(
|
|
name = "{}_compiler_files".format(target_config.zigtarget),
|
|
srcs = [
|
|
":zig",
|
|
":{}_includes".format(target_config.zigtarget),
|
|
cxx_tool_label,
|
|
],
|
|
)
|
|
|
|
filegroup(
|
|
name = "{}_linker_files".format(target_config.zigtarget),
|
|
srcs = [
|
|
":zig",
|
|
":{}_includes".format(target_config.zigtarget),
|
|
cxx_tool_label,
|
|
] + native.glob([
|
|
"lib/libc/{}/**".format(target_config.libc),
|
|
"lib/libcxx/**",
|
|
"lib/libcxxabi/**",
|
|
"lib/libunwind/**",
|
|
"lib/compiler_rt/**",
|
|
"lib/std/**",
|
|
"lib/*.zig",
|
|
"lib/*.h",
|
|
]),
|
|
)
|
|
|
|
filegroup(
|
|
name = "{}_ar_files".format(target_config.zigtarget),
|
|
srcs = [
|
|
":zig",
|
|
":" + zig_tool_path(os).format(
|
|
zig_tool = "ar",
|
|
zigtarget = target_config.zigtarget,
|
|
),
|
|
],
|
|
)
|
|
|
|
filegroup(
|
|
name = "{}_all_files".format(target_config.zigtarget),
|
|
srcs = [
|
|
":{}_linker_files".format(target_config.zigtarget),
|
|
":{}_compiler_files".format(target_config.zigtarget),
|
|
":{}_ar_files".format(target_config.zigtarget),
|
|
],
|
|
)
|
|
|
|
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 + "/**"]))
|
|
|
|
def _flatten(iterable):
|
|
result = []
|
|
for element in iterable:
|
|
result += element
|
|
return result
|