89 lines
2.5 KiB
Markdown
89 lines
2.5 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 compile cgo programs with these c
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libraries:
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- glibc 2.19
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- musl
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glibc 2.19 is the default. That means, glibc 2.19 toolchain is registered with
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these basic constraints:
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```
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[
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"@platforms//os:linux",
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"@platforms//cpu:x86_64",
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]
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```
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# Testing
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## linux cgo + glibc 2.19
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Using the default toolchain:
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```
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$ bazel build --toolchain_resolution_debug=true //test:gognu
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...
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$ ../bazel-bin/test/gognu_/gognu
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hello, world
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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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Explicitly the toolchain explicitly `-gnu`:
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```
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$ bazel run --platforms @com_github_ziglang_zig//:platform_x86_64-linux-gnu //test:gognu
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```
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## linux cgo + musl
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```
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$ bazel build --platforms @com_github_ziglang_zig//:platform_x86_64-linux-musl //test:gomusl
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...
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$ file ../bazel-out/k8-fastbuild-ST-d17813c235ce/bin/test/gomusl_/gomusl
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../bazel-out/k8-fastbuild-ST-d17813c235ce/bin/test/gomusl_/gomusl: 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/gomusl_/gomusl
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hello, world
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```
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## macos cgo + gnu
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Does not work?
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```
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$ bazel build --platforms @com_github_ziglang_zig//:platform_x86_64-macos-musl //test:gognu
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...
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```
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## Transient docker environment
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```
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$ docker run -ti --rm -v $(pwd):/x -w /x debian:buster-slim
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# apt update && apt install curl -y && curl -L https://github.com/bazelbuild/bazelisk/releases/download/v1.9.0/bazelisk-linux-amd64 > /usr/local/bin/bazel && chmod +x /usr/local/bin/bazel
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# export CC=/usr/bin/false
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```
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And run the `bazel build` commands above. Take a look at `.build.yml` and see
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how CI does it.
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# Appendix: compiling manually
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zcc
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```
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#!/bin/bash
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exec zig cc -target x86_64-macos-gnu "$@"
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```
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Build:
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```
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GOOS=darwin GOARCH=amd64 CC=zcc go build -ldflags "-linkmode external -extldflags -static" hello.go
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```
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# Known Issues
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- <s>[golang/go #46644: cmd/link: with CC=zig: SIGSERV when cross-compiling to darwin/amd64](https://github.com/golang/go/issues/46644)</s>
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- [ziglang/zig #9050 golang linker segfault](https://github.com/ziglang/zig/issues/9050)
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