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hermetic_cc_toolchain
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add @zig_sdk//:<os>_<arch>_platform values

nix
Motiejus Jakštys 2022-02-03 14:06:01 +02:00
parent 6136c7059f
commit bcd9731f92
3 changed files with 28 additions and 27 deletions
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26
README.md
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@ -130,24 +130,8 @@ 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.
Currently, platform is not defined in `@zig_sdk`. As you may see in the
examples, we are currently using the one provided by cgo. E.g.
`@io_bazel_rules_go//go/toolchain:linux_amd64_cgo`. This is because we want to
define it in `@zig_sdk//:platform:<platform>`. This is waiting for mine or a
contributor's attention. You may work around this by sending a patch to
bazel-zig-cc or specifying the platform in your project:
```
platform(
name = "linux_aarch64",
constraint_values = [
"@bazel_tools//platforms:linux",
"@bazel_tools//platforms:aarch64",
]
)
```
and `--platforms="//:linux_aarch64"`.
Likewise, platforms are `@zig_sdk//:<platform>_platform`, and should be moved
to `@zig_sdk//:platform:<platform>`.
# Known Issues In Upstream
@ -184,7 +168,7 @@ may apply to aarch64, but the author didn't find a need to test it (yet).
## linux cgo + glibc 2.28
```
$ bazel build --platforms @io_bazel_rules_go//go/toolchain:linux_amd64_cgo //test:hello
$ bazel build --platforms @zig_sdk//:linux_amd64_platform //test:hello
$ file bazel-out/k8-fastbuild-ST-d17813c235ce/bin/test/hello_/hello
bazel-out/k8-fastbuild-ST-d17813c235ce/bin/test/hello_/hello: 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
```
@ -193,7 +177,7 @@ bazel-out/k8-fastbuild-ST-d17813c235ce/bin/test/hello_/hello: ELF 64-bit LSB exe
```
$ bazel build \
--platforms @io_bazel_rules_go//go/toolchain:linux_amd64_cgo \
--platforms @zig_sdk//:linux_amd64_platform \
--extra_toolchains @zig_sdk//:linux_amd64_musl_toolchain //test:hello
...
$ file ../bazel-out/k8-fastbuild-ST-d17813c235ce/bin/test/hello_/hello
@ -205,7 +189,7 @@ hello, world
## macos cgo
```
$ bazel build --platforms @io_bazel_rules_go//go/toolchain:darwin_amd64_cgo //test:hello
$ bazel build --platforms @zig_sdk//:darwin_amd64_platform //test:hello
...
$ file bazel-bin/test/hello_/hello
bazel-bin/test/hello_/hello: Mach-O 64-bit x86_64 executable, flags:<NOUNDEFS|DYLDLINK|TWOLEVEL|PIE>

12
ci/test
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@ -30,28 +30,28 @@ _test "Host" \
_test "darwin_amd64" \
"Mach-O 64-bit x86_64 executable" \
--platforms @io_bazel_rules_go//go/toolchain:darwin_amd64_cgo
--platforms @zig_sdk//:darwin_amd64_platform
# hello world on darwin/arm64 requires OSX SDK via `zig cc --sysroot=<...>`.
# see https://github.com/ziglang/zig/issues/10299#issuecomment-989595215
#_test "darwin_arm64" \
# "Mach-O 64-bit arm64 executable" \
# --platforms @io_bazel_rules_go//go/toolchain:darwin_arm64_cgo
# --platforms @zig_sdk//:darwin_arm64_platform
_test "linux_amd64_gnu" \
"ELF 64-bit.* x86-64.* dynamically linked" \
--platforms @io_bazel_rules_go//go/toolchain:linux_amd64_cgo
--platforms @zig_sdk//:linux_amd64_platform
_test "linux_amd64_musl" \
"ELF 64-bit.* x86-64.* statically linked" \
--platforms @io_bazel_rules_go//go/toolchain:linux_amd64_cgo \
--platforms @zig_sdk//:linux_amd64_platform \
--extra_toolchains @zig_sdk//:linux_amd64_musl_toolchain
_test "linux_arm64_gnu" \
"ELF 64-bit.* ARM aarch64.* dynamically linked" \
--platforms @io_bazel_rules_go//go/toolchain:linux_arm64_cgo
--platforms @zig_sdk//:linux_arm64_platform
_test "linux_arm64_musl" \
"ELF 64-bit.* ARM aarch64.* statically linked" \
--platforms @io_bazel_rules_go//go/toolchain:linux_arm64_cgo \
--platforms @zig_sdk//:linux_arm64_platform \
--extra_toolchains @zig_sdk//:linux_arm64_musl_toolchain

17
toolchain/defs.bzl
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@ -376,3 +376,20 @@ def zig_build_macro(absolute_path, zig_include_root):
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,
)