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Motiejus Jakštys
2021-06-08 05:06:58 +03:00
committed by Motiejus Jakštys
parent 610fe1c0cb
commit 670276e5be
4 changed files with 2 additions and 5 deletions
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11
toolchain/BUILD Normal file
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constraint_setting(name = "libc")
constraint_value(
name = "musl",
constraint_setting = ":libc",
)
constraint_value(
name = "gnu_2_19",
constraint_setting = ":libc",
)

285
toolchain/defs.bzl Normal file
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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/blob/0cfa39304b18c6a04689bd789f5dc4d035ec43b0/src/main.zig#L2962-L2966
TARGET_CONFIGS = [
struct(
target="x86_64-macos-gnu",
includes=[
"libunwind/include",
"libc/include/any-macos-any",
"libc/include/x86_64-macos-any",
"libc/include/x86_64-macos-gnu",
],
# linkopts=["-lc++", "-lc++abi"],
linkopts=[],
copts=[],
bazel_target_cpu="darwin",
constraint_values=["@platforms//os:macos", "@platforms//cpu:x86_64"],
tool_paths={"ld": "ld64.lld"},
),
struct(
target="x86_64-linux-gnu.2.19",
includes=[
"libunwind/include",
"libc/include/generic-glibc",
"libc/include/any-linux-any",
"libc/include/x86_64-linux-gnu",
"libc/include/x86_64-linux-any",
],
linkopts=["-lc++", "-lc++abi"],
copts=[],
bazel_target_cpu="k8",
constraint_values=[
"@platforms//os:linux",
"@platforms//cpu:x86_64",
":gnu_2_19",
],
tool_paths={"ld": "ld.lld"},
),
struct(
target="x86_64-linux-musl",
includes=[
"libc/include/generic-musl",
"libc/include/any-linux-any",
"libc/include/x86_64-linux-musl",
"libc/include/x86_64-linux-any",
],
linkopts=[],
copts=["-D_LIBCPP_HAS_MUSL_LIBC", "-D_LIBCPP_HAS_THREAD_API_PTHREAD"],
bazel_target_cpu="k8",
constraint_values=[
"@platforms//os:linux",
"@platforms//cpu:x86_64",
":musl",
],
tool_paths={"ld": "ld.lld"},
),
]
def toolchain_repositories():
zig_repository(
name = "com_github_ziglang_zig",
version = "0.8.0",
url_format = "https://ziglang.org/download/{version}/zig-{host_platform}-{version}.tar.xz",
host_platform_sha256 = {
"linux-x86_64": "502625d3da3ae595c5f44a809a87714320b7a40e6dff4a895b5fa7df3391d01e",
"macos-x86_64": "279f9360b5cb23103f0395dc4d3d0d30626e699b1b4be55e98fd985b62bc6fbe",
},
host_platform_include_root = {
"macos-x86_64": "lib/zig/",
"linux-x86_64": "lib/",
}
)
def register_all_toolchains():
for target_config in TARGET_CONFIGS:
native.register_toolchains(
"@com_github_ziglang_zig//:%s_toolchain" % target_config.target,
)
ZIG_TOOL_PATH = "tools/{zig_tool}"
ZIG_TOOL_WRAPPER = """#!/bin/bash
export HOME=$TMPDIR
exec "{zig}" "{zig_tool}" "$@"
"""
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
]
BUILD = """
load("@zig-cc-bazel//toolchain:defs.bzl", "zig_build_macro")
package(default_visibility = ["//visibility:public"])
zig_build_macro(absolute_path={absolute_path}, zig_include_root={zig_include_root})
constraint_setting(name = "libc")
constraint_value(
name = "gnu_2_19",
constraint_setting = ":libc",
)
constraint_value(
name = "musl",
constraint_setting = ":libc",
)
platform(
name = "platform_linux-x86_64-musl",
constraint_values = [
"@platforms//os:linux",
"@platforms//cpu:x86_64",
":musl",
],
)
platform(
name = "platform_linux-x86_64-gnu",
constraint_values = [
"@platforms//os:linux",
"@platforms//cpu:x86_64",
":gnu_2_19",
],
)
"""
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),
)
absolute_path = json.encode(str(repository_ctx.path("")))
repository_ctx.file(
"BUILD",
BUILD.format(absolute_path=absolute_path, zig_include_root=json.encode(zig_include_root)),
)
zig_repository = repository_rule(
attrs = {
"url": attr.string(),
"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")
filegroup(name="zig_compiler", srcs=["zig"])
filegroup(name="lib/std", srcs=native.glob(["lib/std/**"]))
lazy_filegroups = {}
for target_config in TARGET_CONFIGS:
target = target_config.target
native.platform(name = target, constraint_values = target_config.constraint_values)
all_srcs = []
ar_srcs = [":zig_compiler"]
linker_srcs = [":zig_compiler"]
compiler_srcs = [":zig_compiler"]
tool_srcs = {"gcc": compiler_srcs, "ld": linker_srcs, "ar": ar_srcs}
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 + "/**"]))
compiler_srcs.append(lazy_filegroups[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)
tool_srcs[name].append(tool_path)
ar_files = filegroup(name=target + "_ar_files", srcs=ar_srcs)
linker_files = filegroup(name=target + "_linker_files", srcs=linker_srcs)
compiler_files = filegroup(name=target + "_compiler_files", srcs=compiler_srcs)
all_files = filegroup(name=target + "_all_files", srcs=all_srcs + [ar_files, linker_files, compiler_files])
zig_cc_toolchain_config(
name = target + "_cc_toolchain_config",
target = target,
tool_paths = absolute_tool_paths,
cxx_builtin_include_directories = cxx_builtin_include_directories,
copts = target_config.copts,
linkopts = target_config.linkopts,
target_system_name = "unknown",
target_cpu = target_config.bazel_target_cpu,
target_libc = "unknown",
compiler = "clang",
abi_version = "unknown",
abi_libc_version = "unknown",
)
native.cc_toolchain(
name = target + "_cc_toolchain",
toolchain_identifier = target + "-toolchain",
toolchain_config = ":%s_cc_toolchain_config" % target,
all_files = all_files,
ar_files = ar_files,
compiler_files = compiler_files,
linker_files = linker_files,
dwp_files = ":empty",
objcopy_files = ":empty",
strip_files = ":empty",
supports_param_files = 0,
)
native.cc_toolchain_suite(
name = target + "_cc_toolchain_suite",
toolchains = {
target_config.bazel_target_cpu: ":%s_cc_toolchain" % target,
},
tags = ["manual"]
)
native.toolchain(
name = target + "_toolchain",
exec_compatible_with = None,
target_compatible_with = target_config.constraint_values,
toolchain = ":%s_cc_toolchain" % target,
toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
)

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toolchain/zig_toolchain.bzl Normal file
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load("@bazel_tools//tools/build_defs/cc:action_names.bzl", "ACTION_NAMES")
load("@bazel_tools//tools/cpp:cc_toolchain_config_lib.bzl",
"feature",
"flag_group",
"flag_set",
"tool_path",
"tool",
)
all_link_actions = [
ACTION_NAMES.cpp_link_executable,
ACTION_NAMES.cpp_link_dynamic_library,
ACTION_NAMES.cpp_link_nodeps_dynamic_library,
]
all_compile_actions = [
ACTION_NAMES.assemble,
ACTION_NAMES.c_compile,
ACTION_NAMES.cc_flags_make_variable,
ACTION_NAMES.clif_match,
ACTION_NAMES.cpp_compile,
ACTION_NAMES.cpp_header_parsing,
ACTION_NAMES.cpp_module_codegen,
ACTION_NAMES.cpp_module_compile,
ACTION_NAMES.linkstamp_compile,
ACTION_NAMES.lto_backend,
ACTION_NAMES.preprocess_assemble,
]
def _zig_cc_toolchain_config_impl(ctx):
default_compiler_flags = feature(
name = "default_compiler_flags",
enabled = True,
flag_sets = [
flag_set(
actions = all_compile_actions,
flag_groups = [
flag_group(
flags = [
"-I" + d
for d in ctx.attr.cxx_builtin_include_directories
] + [
"-target", ctx.attr.target,
"-no-canonical-prefixes",
"-Wno-builtin-macro-redefined",
"-D__DATE__=\"redacted\"",
"-D__TIMESTAMP__=\"redacted\"",
"-D__TIME__=\"redacted\"",
] + ctx.attr.copts,
),
],
),
],
)
default_linker_flags = feature(
name = "default_linker_flags",
enabled = True,
flag_sets = [
flag_set(
actions = all_link_actions,
flag_groups = ([
flag_group(
flags = [
"-target", ctx.attr.target,
] + ctx.attr.linkopts,
),
]),
),
],
)
features = [
default_compiler_flags,
default_linker_flags,
]
return cc_common.create_cc_toolchain_config_info(
ctx = ctx,
features = features,
toolchain_identifier = "%s-toolchain" % ctx.attr.target,
host_system_name = "local",
target_system_name = ctx.attr.target_system_name,
target_cpu = ctx.attr.target_cpu,
target_libc = ctx.attr.target_libc,
compiler = ctx.attr.compiler,
abi_version = ctx.attr.abi_version,
abi_libc_version = ctx.attr.abi_libc_version,
tool_paths = [
tool_path(name=name, path=path)
for name, path in ctx.attr.tool_paths.items()
],
cxx_builtin_include_directories = ctx.attr.cxx_builtin_include_directories,
)
zig_cc_toolchain_config = rule(
implementation = _zig_cc_toolchain_config_impl,
attrs = {
"cxx_builtin_include_directories": attr.string_list(),
"linkopts": attr.string_list(),
"copts": attr.string_list(),
"tool_paths": attr.string_dict(),
"target": attr.string(),
"target_system_name": attr.string(),
"target_cpu": attr.string(),
"target_libc": attr.string(),
"compiler": attr.string(),
"abi_version": attr.string(),
"abi_libc_version": attr.string(),
},
provides = [CcToolchainConfigInfo],
)