75 lines
2.8 KiB
Markdown
75 lines
2.8 KiB
Markdown
[](https://builds.sr.ht/~motiejus/bazel-zig-cc)
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# Bazel zig cc toolchain for Go
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This is a prototype zig-cc toolchain that can cross-compile cgo programs to these os/archs:
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- x86_64-linux-gnu.2.19
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- x86_64-linux-musl
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- aarch-linux-gnu.2.19
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- aarch-linux-musl
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- x86_64-macos-gnu
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- aarch64-macos-gnu
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GNU toolchain is the default, musl toolchain can be selected by adding it to
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`--extra_toolchains @zig_sdk//:ARCH-linux-musl_toolchain`.
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Don't use this yet, see [Known Issues](#known-issues)).
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# Testing
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## linux cgo + glibc 2.19
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Glibc toolchain is suffixed with `-gnu`:
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```
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$ bazel run --platforms @zig_sdk//:x86_64-linux-gnu //test:gognu
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$ file bazel-bin/test/gognu_/gognu
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bazel-bin/test/gognu_/gognu: 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
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```
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## linux cgo + musl
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```
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$ bazel build \
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--platforms @io_bazel_rules_go//go/toolchain:linux_amd64_cgo \
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--extra_toolchains @zig_sdk//:x86_64-linux-musl_toolchain //test:hello
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...
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$ file ../bazel-out/k8-fastbuild-ST-d17813c235ce/bin/test/hello_/hello
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../bazel-out/k8-fastbuild-ST-d17813c235ce/bin/test/hello_/hello: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, Go BuildID=redacted, with debug_info, not stripped
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$ ../bazel-out/k8-fastbuild-ST-d17813c235ce/bin/test/hello_/hello
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hello, world
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```
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## macos cgo
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```
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$ bazel build --platforms @zig_sdk//:x86_64-macos-gnu //test:gognu
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...
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$ file bazel-bin/test/gognu_/gognu
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bazel-bin/test/gognu_/gognu: Mach-O 64-bit x86_64 executable, flags:<NOUNDEFS|DYLDLINK|TWOLEVEL|PIE>
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```
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## Transient docker environment
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```
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$ docker run -ti --rm -v $(pwd):/x -w /x debian:buster-slim
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# apt update && apt install curl -y && curl -L https://github.com/bazelbuild/bazelisk/releases/download/v1.9.0/bazelisk-linux-amd64 > /usr/local/bin/bazel && chmod +x /usr/local/bin/bazel
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# export CC=/usr/bin/false
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```
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And run the `bazel build` commands above. Take a look at `.build.yml` and see
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how CI does it.
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# Known Issues
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- [ziglang/zig #9139 zig c++ hanging when compiling in parallel](https://github.com/ziglang/zig/issues/9139)
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- [rules/go #2894 Per-arch_target linker flags](https://github.com/bazelbuild/rules_go/issues/2894)
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Closed issues:
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- [golang/go #46644: cmd/link: with CC=zig: SIGSERV when cross-compiling to darwin/amd64](https://github.com/golang/go/issues/46644) (CLOSED)
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- [ziglang/zig #9050 golang linker segfault](https://github.com/ziglang/zig/issues/9050) (CLOSED)
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- [ziglang/zig #7917 [meta] better c/c++ toolchain compatibility](https://github.com/ziglang/zig/issues/7917) (CLOSED)
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- [ziglang/zig #7915 ar-compatible command for zig cc](https://github.com/ziglang/zig/issues/7915) (CLOSED)
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