update README
- add more test commands - add the Laurynas BazelCon talk
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Motiejus Jakštys
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README.md
38
README.md
@ -297,20 +297,6 @@ unlikely to implement them any time soon, but patches implementing those will
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be accepted. See [Questions & Contributions](#questions-amp-contributions) on
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how to contribute.
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## Sharing of libc shims/libc++.a
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Zig does not always share `libc++.a` and the glibc shims. We have observed
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to be caused for 2 reasons:
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- For some commands Go `chdir`s to `/tmp/`. This causes `ZIG_LIB_DIR` to be
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absolute, which blows the cache key to find the right `libc++.a` (because Zig
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thinks we are using a different lib dir to compile libc++). This is currently
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worked around in `toolchain/defs.bzl` by overfitting to Go and returning
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early from that particular invocation.
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- Sometimes Bazel's sandbox messes up Zig's cache keys. If one runs without the
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sandbox (`--spawn_strategy=standalone`), the cache hit rate and thus the
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build time are much better.
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## Zig cache location
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Currently zig cache is in `$HOME`, so `bazel clean --expunge` does not clear
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@ -376,6 +362,8 @@ Feel free to track [Universal headers][universal-headers] project for a fix.
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- [rules/go #2894 Per-arch_target linker flags](https://github.com/bazelbuild/rules_go/issues/2894) (CLOSED, thanks mjonaitis)
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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, thanks kubkon)
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... and more.
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# Host Environments
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This repository is used on the following (host) platforms:
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@ -410,8 +398,9 @@ $ docker run -e CC=/usr/bin/false -ti --rm -v "$PWD:/x" -w /x debian:bullseye-sl
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# apt update
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# apt install --no-install-recommends -y direnv git shellcheck ca-certificates
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# eval "$(direnv hook bash)" && direnv allow
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# ./ci/test
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# ./ci/lint
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# ./ci/launcher
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# ./ci/test
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```
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Some of the tests rely on `qemu-aarch64` to run arm64 binaries and wine for
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@ -423,8 +412,7 @@ $ docker run -e CC=/usr/bin/false -ti --rm -v "$PWD:/x" -w /x debian:bullseye-sl
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# dpkg --add-architecture arm64 && apt update
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# apt install --no-install-recommends -y direnv git shellcheck ca-certificates libc6:arm64 qemu-user-static wine64
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# eval "$(direnv hook bash)" && direnv allow
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# ./ci/test
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# ./ci/lint
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<... run the ci/ commands as above>
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```
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# Questions & Contributions
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@ -457,8 +445,8 @@ interests when reading patches or mailing lists.
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- Committer: Laurynas Lubys. Bazel expert with regards to tests, transitions
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and overall structure. Rewrote bazel-zig-cc to cater for platforms when libc
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platforms were added.
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- Committer: Ken Micklas. Ken is leading hermetic toolchain effort at Uber, of
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which bazel-zig-cc is a part of.
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- Committer: Ken Micklas. Ken was leading hermetic toolchain effort at Uber
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throughout 2022, of which bazel-zig-cc is a part of.
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- Maintainer for Windows: Fabian Hahn. If you make a change that breaks
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Windows, Fabian will find you. Please don't break Windows, so Fabian doesn't
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have to look for you. Instead, send him your patches first.
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@ -469,6 +457,12 @@ You may find contact information of the individuals in the commit logs.
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This section lists notable uses or mentions of bazel-zig-cc.
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- 2023-01-24 [bazel-zig-cc v1.0.0][bazel-zig-cc-v1]: releasing bazel-zig-cc and
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admitting that bazel-zig-cc is used in production to compile all of Uber's
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[Go Monorepo][go-monorepo].
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- 2022-11-18 [BazelCon 2022: Making Uber's hermetic C++
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toolchain][bazelcon2022]: Laurynas Lubys presents the story of how this
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repository came into being and how it was used (as of the conference).
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- 2022-05-23 [How Zig is used at Uber (youtube)][yt-how-zig-is-used-at-uber]:
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Yours Truly (the author) talks about how bazel-zig-cc came to existence and
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how it's used at Uber in Milan Zig Meetup.
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@ -477,9 +471,6 @@ This section lists notable uses or mentions of bazel-zig-cc.
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author $250 for bazel-zig-cc.
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- 2022-01-13 [bazel-zig-cc building Envoy][zig-cc-envoy].
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If you'd like your blog post, company or a project added here, do not hesitate
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and send a patch.
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# Thanks
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Many thanks to Adam Bouhenguel and his [bazel-zig-cc][ajbouh], the parent of
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@ -504,3 +495,6 @@ the issues promptly.
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[google-award]: https://opensource.googleblog.com/2022/03/Announcing-First-Group-of-Google-Open-Source-Peer-Bonus-Winners-in-2022.html
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[go-gc-sections]: https://go-review.googlesource.com/c/go/+/407814
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[universal-headers]: https://github.com/ziglang/universal-headers
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[bazel-zig-cc-v1]: https://lists.sr.ht/~motiejus/bazel-zig-cc/%3CCAFVMu-rYbf_jDTT4p%3DCS2KV1asdS5Ovo5AyuCwgv2AXr8OOP0g%40mail.gmail.com%3E
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[go-monorepo]: https://www.uber.com/blog/go-monorepo-bazel/
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[bazelcon2022]: https://www.youtube.com/watch?v=a1jXzx3884g
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