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update README

- add more test commands
- add the Laurynas BazelCon talk
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Motiejus Jakštys 2023-01-30 17:18:11 -08:00
parent 3ba59fcb78
commit 90867df2b7
1 changed files with 16 additions and 22 deletions

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