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Motiejus Jakštys 5bf03915be implement fcntl64 hack
glibc overrides fcntl with a macro to fcntl64; implement some trickery
to bring back fcntl on older toolchain.
2021-07-28 23:44:06 +03:00
bin wip: go repositories 2021-07-21 14:59:33 +03:00
test add some C dependencies 2021-07-21 15:02:04 +03:00
toolchain implement fcntl64 hack 2021-07-28 23:44:06 +03:00
.bazelrc remove non-required options from .bazelrc 2021-06-30 16:00:42 +03:00
.bazelversion downgrade bazel to 3.7.0 2021-06-28 12:52:20 +03:00
.build.yml rename zig toolchain to match go 2021-07-21 14:53:39 +03:00
.envrc fix .envrc 2021-07-21 16:28:33 +03:00
.gitignore downgrade bazel to 3.7.0 2021-06-28 12:52:20 +03:00
BUILD add gazelle:prefix 2021-06-07 22:40:51 +03:00
LICENSE add license 2021-06-11 06:16:23 +03:00
README.md add a known issue 2021-07-21 19:37:55 +03:00
WORKSPACE wip: go repositories 2021-07-21 14:59:33 +03:00
build-and-file move setup to .envrc 2021-06-28 14:00:47 +03:00
go.mod add some C dependencies 2021-07-21 15:02:04 +03:00
go.sum add some C dependencies 2021-07-21 15:02:04 +03:00
repositories.bzl add some C dependencies 2021-07-21 15:02:04 +03:00

README.md

builds.sr.ht status

Bazel zig cc toolchain for Go

This is a prototype zig-cc toolchain that can cross-compile cgo programs to these os/archs:

  • x86_64-linux-gnu.2.19
  • x86_64-linux-musl
  • aarch-linux-gnu.2.19
  • aarch-linux-musl
  • x86_64-macos-gnu
  • aarch64-macos-gnu

GNU toolchain is the default, musl toolchain can be selected by adding it to --extra_toolchains @zig_sdk//:ARCH-linux-musl_toolchain.

Don't use this yet, see Known Issues).

Testing

linux cgo + glibc 2.19

Glibc toolchain is suffixed with -gnu:

$ bazel run --platforms @zig_sdk//:x86_64-linux-gnu //test:gognu
$ file bazel-bin/test/gognu_/gognu
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

linux cgo + musl

$ bazel build \
    --platforms @io_bazel_rules_go//go/toolchain:linux_amd64_cgo \
    --extra_toolchains @zig_sdk//:x86_64-linux-musl_toolchain //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), statically linked, Go BuildID=redacted, with debug_info, not stripped
$ ../bazel-out/k8-fastbuild-ST-d17813c235ce/bin/test/hello_/hello
hello, world

macos cgo

$ bazel build --platforms @zig_sdk//:x86_64-macos-gnu //test:gognu
...
$ file bazel-bin/test/gognu_/gognu
bazel-bin/test/gognu_/gognu: Mach-O 64-bit x86_64 executable, flags:<NOUNDEFS|DYLDLINK|TWOLEVEL|PIE>

Transient docker environment

$ docker run -ti --rm -v $(pwd):/x -w /x debian:buster-slim
# 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
# export CC=/usr/bin/false

And run the bazel build commands above. Take a look at .build.yml and see how CI does it.

Known Issues

Closed issues: