motiejus/hermetic_cc_toolchain
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Motiejus Jakštys 2022-04-07 14:37:08 +03:00
commit 56daeaf6c0
14 changed files with 293 additions and 255 deletions
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8
.bazelrc
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@ -6,10 +6,10 @@ build --worker_sandboxing
build --compilation_mode=opt
build --incompatible_enable_cc_toolchain_resolution
build --extra_toolchains @zig_sdk//:linux_amd64_gnu.2.19_toolchain
build --extra_toolchains @zig_sdk//:linux_arm64_gnu.2.28_toolchain
build --extra_toolchains @zig_sdk//:darwin_amd64_toolchain
build --extra_toolchains @zig_sdk//:darwin_arm64_toolchain
build --extra_toolchains @zig_sdk//toolchain:linux_amd64_gnu.2.19
build --extra_toolchains @zig_sdk//toolchain:linux_arm64_gnu.2.28
build --extra_toolchains @zig_sdk//toolchain:darwin_amd64
build --extra_toolchains @zig_sdk//toolchain:darwin_arm64
test:qemu-aarch64 --test_env=QEMU_LD_PREFIX=/usr/aarch64-linux-gnu/
test:qemu-aarch64 --run_under=qemu-aarch64-static

4
.build.yml
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@ -19,9 +19,9 @@ tasks:
- test_list_toolchains_platforms: |
cd bazel-zig-cc; . .envrc
echo "Available toolchains:"
bazel query @zig_sdk//... | grep _toolchain$
bazel query @zig_sdk//toolchain:*
echo "Available platforms:"
bazel query @zig_sdk//... | grep _platform$
bazel query @zig_sdk//platform:*
- test_hello_on_toolchains: |
cd bazel-zig-cc
./ci/test --color=yes --curses=yes

27
README.md
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@ -41,10 +41,10 @@ And this to `.bazelrc`:
```
build --incompatible_enable_cc_toolchain_resolution
build --extra_toolchains @zig_sdk//:linux_amd64_gnu.2.19_toolchain
build --extra_toolchains @zig_sdk//:linux_arm64_gnu.2.28_toolchain
build --extra_toolchains @zig_sdk//:darwin_amd64_toolchain
build --extra_toolchains @zig_sdk//:darwin_arm64_toolchain
build --extra_toolchains @zig_sdk//toolchain:linux_amd64_gnu.2.19
build --extra_toolchains @zig_sdk//toolchain:linux_arm64_gnu.2.28
build --extra_toolchains @zig_sdk//toolchain:darwin_amd64
build --extra_toolchains @zig_sdk//toolchain:darwin_arm64
```
The snippets above will download the zig toolchain and register it for the
@ -80,7 +80,7 @@ different one is registered using `--extra_toolchains <toolchain>` in
tests) on linux/amd64/musl, you may specify:
```
--extra_toolchains @zig_sdk//:linux_amd64_musl_toolchain
--extra_toolchains @zig_sdk//toolchain:linux_amd64_musl
```
## UBSAN and "SIGILL: Illegal Instruction"
@ -108,15 +108,6 @@ how to contribute.
Currently zig cache is in `$HOME`, so `bazel clean --expunge` does not clear
the zig cache. Zig's cache should be stored somewhere in the project's path.
## Toolchain and platform target locations
The path to Bazel toolchains is `@zig_sdk//:<toolchain>_toolchain`. It should
be moved to `@zig_sdk//toolchain:<toolchain>` or similar; so the user-facing
targets are in their own namespace.
Likewise, platforms are `@zig_sdk//:<platform>_platform`, and should be moved
to `@zig_sdk//:platform:<platform>`.
## OSX: sysroot
For non-trivial programs (and for all darwin/arm64 cgo programs) MacOS SDK may
@ -164,7 +155,7 @@ may apply to aarch64, but the author didn't find a need to test it (yet).
## build & run linux cgo + glibc
```
$ bazel build --platforms @zig_sdk//:linux_amd64_platform //test/go:go
$ bazel build --platforms @zig_sdk//platform:linux_amd64 //test/go:go
$ file bazel-out/k8-opt-ST-d17813c235ce/bin/test/go/go_/go
bazel-out/k8-opt-ST-d17813c235ce/bin/test/go/go_/go: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.0.0, Go BuildID=redacted, with debug_info, not stripped
$ bazel-out/k8-opt-ST-d17813c235ce/bin/test/go/go_/go
@ -176,8 +167,8 @@ hello, world
```
$ bazel test \
--config=qemu-aarch64 \
--platforms @zig_sdk//:linux_arm64_platform \
--extra_toolchains @zig_sdk//:linux_arm64_musl_toolchain //test/...
--platforms @zig_sdk//platform:linux_arm64 \
--extra_toolchains @zig_sdk//toolchain:linux_arm64_musl //test/...
...
INFO: Build completed successfully, 10 total actions
//test/go:go_test PASSED in 0.2s
@ -186,7 +177,7 @@ INFO: Build completed successfully, 10 total actions
## macos cgo
```
$ bazel build --platforms @zig_sdk//:darwin_amd64_platform //test/go:go
$ bazel build --platforms @zig_sdk//platform:darwin_amd64 //test/go:go
...
$ file bazel-out/k8-opt-ST-d17813c235ce/bin/test/go/go_/go
bazel-out/k8-opt-ST-d17813c235ce/bin/test/go/go_/go: Mach-O 64-bit x86_64 executable, flags:<NOUNDEFS|DYLDLINK|TWOLEVEL|PIE|HAS_TLV_DESCRIPTORS>

4
ci/test
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@ -18,8 +18,8 @@ while read -r action platform toolchain config; do
fi
args+=(\
--platforms "@zig_sdk//:${platform}_platform" \
--extra_toolchains "@zig_sdk//:${toolchain}_toolchain" \
--platforms "@zig_sdk//platform:${platform}" \
--extra_toolchains "@zig_sdk//toolchain:${toolchain}" \
//test/... \
)

5
toolchain/BUILD.sdk.bazel
View File

@ -1,11 +1,10 @@
load("@bazel-zig-cc//toolchain:defs.bzl", "zig_build_macro")
load("@bazel-zig-cc//toolchain:defs.bzl", "declare_files")
package(
default_visibility = ["//visibility:public"],
)
zig_build_macro(
absolute_path = {absolute_path},
declare_files(
zig_include_root = {zig_include_root},
)

250
toolchain/defs.bzl
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@ -1,23 +1,7 @@
load("@bazel_skylib//lib:shell.bzl", "shell")
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(":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",
]
load("@bazel-zig-cc//toolchain/private:defs.bzl", "DEFAULT_INCLUDE_DIRECTORIES", "ZIG_TOOL_PATH", "target_structs")
_fcntl_map = """
GLIBC_2.2.5 {
@ -32,114 +16,6 @@ __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(
gotarget = "darwin_{}".format(gocpu),
zigtarget = "{}-macos-gnu".format(zigcpu),
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",
],
linkopts = [],
copts = [],
bazel_target_cpu = "darwin",
constraint_values = [
"@platforms//os:macos",
"@platforms//cpu:{}".format(zigcpu),
],
tool_paths = {"ld": "ld64.lld"},
)
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
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(
gotarget = "linux_{}_{}".format(gocpu, glibc_suffix),
zigtarget = "{}-linux-{}".format(zigcpu, glibc_suffix),
includes = [
"libunwind/include",
"libc/include/generic-glibc",
"libc/include/any-linux-any",
"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 [],
linkopts = ["-lc++", "-lc++abi"],
copts = [],
bazel_target_cpu = "k8",
constraint_values = [
"@platforms//os:linux",
"@platforms//cpu:{}".format(zigcpu),
],
tool_paths = {"ld": "ld.lld"},
)
def _target_linux_musl(gocpu, zigcpu):
return 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),
] + (["libc/include/x86-linux-any"] if zigcpu == "x86_64" else []),
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"},
)
# 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"
@ -189,10 +65,9 @@ def register_toolchains(
},
)
toolchains = ["@zig_sdk//:%s_toolchain" % t for t in register]
toolchains = ["@zig_sdk//:toolchain:%s" % t for t in register]
native.register_toolchains(*toolchains)
ZIG_TOOL_PATH = "tools/{zig_tool}"
ZIG_TOOL_WRAPPER = """#!/bin/bash
set -e
@ -264,10 +139,29 @@ def _zig_repository_impl(repository_ctx):
content = _fcntl_h,
)
repository_ctx.symlink(
Label("//toolchain/platform:BUILD"),
"platform/BUILD",
)
repository_ctx.template(
"BUILD.bazel",
"BUILD",
Label("//toolchain:BUILD.sdk.bazel"),
executable = False,
substitutions = {
"{zig_include_root}": shell.quote(zig_include_root),
},
)
repository_ctx.symlink(
Label("//toolchain/toolchain:BUILD"),
"toolchain/BUILD",
)
repository_ctx.template(
"private/BUILD",
Label("//toolchain/private:BUILD.sdk.bazel"),
executable = False,
substitutions = {
"{absolute_path}": shell.quote(str(repository_ctx.path(""))),
"{zig_include_root}": shell.quote(zig_include_root),
@ -284,115 +178,19 @@ zig_repository = repository_rule(
implementation = _zig_repository_impl,
)
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))
for glibc in [""] + _GLIBCS:
ret.append(_target_linux_gnu(gocpu, zigcpu, glibc))
return ret
def filegroup(name, **kwargs):
native.filegroup(name = name, **kwargs)
return ":" + name
def zig_build_macro(absolute_path, zig_include_root):
def declare_files(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_structs():
gotarget = target_config.gotarget
zigtarget = target_config.zigtarget
cxx_builtin_include_directories = []
for target_config in target_structs():
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)
for d in getattr(target_config, "toplevel_include", []):
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
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]
zig_cc_toolchain_config(
name = zigtarget + "_toolchain_cc_config",
target = zigtarget,
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 + "_toolchain_cc",
toolchain_identifier = zigtarget + "-toolchain",
toolchain_config = ":%s_toolchain_cc_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,
)
# register two kinds of toolchain targets: Go and Zig conventions.
# Go convention: amd64/arm64, linux/darwin
native.toolchain(
name = gotarget + "_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",
)
# 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,
)

3
toolchain/platform/BUILD Normal file
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@ -0,0 +1,3 @@
load("@bazel-zig-cc//toolchain/platform:defs.bzl", "declare_platforms")
declare_platforms()

17
toolchain/platform/defs.bzl Normal file
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@ -0,0 +1,17 @@
def declare_platforms():
# 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}".format(os = os, zigcpu = zigcpu),
constraint_values = constraint_values,
)
native.platform(
name = "{os}_{gocpu}".format(os = os, gocpu = gocpu),
constraint_values = constraint_values,
)

0
toolchain/private/BUILD Normal file
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6
toolchain/private/BUILD.sdk.bazel Normal file
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@ -0,0 +1,6 @@
load("@bazel-zig-cc//toolchain/private:cc_toolchains.bzl", "declare_cc_toolchains")
declare_cc_toolchains(
absolute_path = {absolute_path},
zig_include_root = {zig_include_root},
)

68
toolchain/private/cc_toolchains.bzl Normal file
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@ -0,0 +1,68 @@
load(":defs.bzl", "DEFAULT_INCLUDE_DIRECTORIES", "ZIG_TOOL_PATH", "target_structs")
load("@bazel-zig-cc//toolchain: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()
def declare_cc_toolchains(absolute_path, zig_include_root):
for target_config in target_structs():
gotarget = target_config.gotarget
zigtarget = target_config.zigtarget
cxx_builtin_include_directories = []
for d in DEFAULT_INCLUDE_DIRECTORIES + target_config.includes:
d = zig_include_root + d
cxx_builtin_include_directories.append(absolute_path + "/" + d)
for d in getattr(target_config, "toplevel_include", []):
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
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]
zig_cc_toolchain_config(
name = zigtarget + "_cc_config",
target = zigtarget,
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_identifier = zigtarget + "-toolchain",
toolchain_config = ":%s_cc_config" % zigtarget,
all_files = "@zig_sdk//:zig",
ar_files = "@zig_sdk//:zig",
compiler_files = "@zig_sdk//:zig",
linker_files = "@zig_sdk//:zig",
dwp_files = "@zig_sdk//:empty",
objcopy_files = "@zig_sdk//:empty",
strip_files = "@zig_sdk//:empty",
supports_param_files = 0,
)

124
toolchain/private/defs.bzl Normal file
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@ -0,0 +1,124 @@
DEFAULT_INCLUDE_DIRECTORIES = [
"include",
"libcxx/include",
"libcxxabi/include",
]
ZIG_TOOL_PATH = "tools/{zig_tool}"
# 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_structs():
ret = []
for zigcpu, gocpu in (("x86_64", "amd64"), ("aarch64", "arm64")):
ret.append(_target_darwin(gocpu, zigcpu))
ret.append(_target_linux_musl(gocpu, zigcpu))
for glibc in [""] + _GLIBCS:
ret.append(_target_linux_gnu(gocpu, zigcpu, glibc))
return ret
def _target_darwin(gocpu, zigcpu):
min_os = "10"
if zigcpu == "aarch64":
min_os = "11"
return struct(
gotarget = "darwin_{}".format(gocpu),
zigtarget = "{}-macos-gnu".format(zigcpu),
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",
],
linkopts = [],
copts = [],
bazel_target_cpu = "darwin",
constraint_values = [
"@platforms//os:macos",
"@platforms//cpu:{}".format(zigcpu),
],
tool_paths = {"ld": "ld64.lld"},
)
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
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(
gotarget = "linux_{}_{}".format(gocpu, glibc_suffix),
zigtarget = "{}-linux-{}".format(zigcpu, glibc_suffix),
includes = [
"libunwind/include",
"libc/include/generic-glibc",
"libc/include/any-linux-any",
"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 [],
linkopts = ["-lc++", "-lc++abi"],
copts = [],
bazel_target_cpu = "k8",
constraint_values = [
"@platforms//os:linux",
"@platforms//cpu:{}".format(zigcpu),
],
tool_paths = {"ld": "ld.lld"},
)
def _target_linux_musl(gocpu, zigcpu):
return 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),
] + (["libc/include/x86-linux-any"] if zigcpu == "x86_64" else []),
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"},
)

7
toolchain/toolchain/BUILD Normal file
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load("@bazel-zig-cc//toolchain/toolchain:defs.bzl", "declare_toolchains")
package(
default_visibility = ["//visibility:public"],
)
declare_toolchains()

25
toolchain/toolchain/defs.bzl Normal file
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load("@bazel-zig-cc//toolchain/private:defs.bzl", "DEFAULT_INCLUDE_DIRECTORIES", "ZIG_TOOL_PATH", "target_structs")
def declare_toolchains():
for target_config in target_structs():
gotarget = target_config.gotarget
zigtarget = target_config.zigtarget
# register two kinds of toolchain targets: Go and Zig conventions.
# Go convention: amd64/arm64, linux/darwin
native.toolchain(
name = gotarget,
exec_compatible_with = None,
target_compatible_with = target_config.constraint_values,
toolchain = "@zig_sdk//private:%s_cc" % zigtarget,
toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
)
# Zig convention: x86_64/aarch64, linux/macos
native.toolchain(
name = zigtarget,
exec_compatible_with = None,
target_compatible_with = target_config.constraint_values,
toolchain = "@zig_sdk//private:%s_cc" % zigtarget,
toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
)