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hermetic_cc_toolchain
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update README 

- close finished tasks.
- mention sysroot.
- add a todo/roadmap.
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Motiejus Jakštys 2021-12-09 10:40:04 +02:00
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@ -37,7 +37,6 @@ following platforms:
- `x86_64-linux-gnu.2.28` for `["@platforms//os:linux", "@platforms//cpu:x86_64"]`.
- `x86_64-macos-gnu` for `["@platforms//os:macos", "@platforms//cpu:x86_64"]`.
Note that both Go and Bazel naming schemes are accepted. For convenience with
Go, the following Go-style toolchain aliases are created:
@ -55,7 +54,11 @@ used, run:
$ bazel query @zig_sdk//... | sed -En '/.*_toolchain$/ s/.*:(.*)_toolchain$/\1/p'
```
Read [#Known Issues](#known-issues) before using.
## Compiling OS X executables
MacOS SDK (`--sysroot`) may be necessary. Read [Jakub's comment](sysroot) about
it. This section will be expanded once yours truly understands more about the
requirements and limitations of linking on OSX.
# Known Issues
@ -97,32 +100,17 @@ specifying the suffix to the oldest system that is mean to run the compiled
binaries. This is safe, because glibc is backwards-compatible. Alternatively,
use musl.
## [darwin x86_64 cgo] regression
**Severity: High**
**Task:** [ziglang/zig [darwin x86_64 cgo] regression #10297](https://github.com/ziglang/zig/issues/10297)
Background: `zig cc` cannot create Darwin x86_64 binaries.
## [darwin aarch64 cgo] regression
**Severity: Low**
**Task:** [ziglang/zig [darwin aarch64 cgo] regression #10299](https://github.com/ziglang/zig/issues/10299)
Background: `zig cc` cannot create Darwin aarch64 binaries. Low severity,
because M1 is not yet a priority.
# Closed issues
- [ziglang/zig #9139 zig c++ hanging when compiling in parallel](https://github.com/ziglang/zig/issues/9139) (CLOSED, thanks andrewrk)
- [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)
- [ziglang/zig #9050 golang linker segfault](https://github.com/ziglang/zig/issues/9050) (CLOSED, thanks kubkon)
- [ziglang/zig #7917 [meta] better c/c++ toolchain compatibility](https://github.com/ziglang/zig/issues/7917) (CLOSED, thanks andrewrk)
- [ziglang/zig #7915 ar-compatible command for zig cc](https://github.com/ziglang/zig/issues/7915) (CLOSED, thanks andrewrk)
- [rules/go #2894 Per-arch_target linker flags](https://github.com/bazelbuild/rules_go/issues/2894) (CLOSED, thanks mjonaitis)
- [ziglang/zig [darwin aarch64 cgo] regression #10299](https://github.com/ziglang/zig/issues/10299) (CLOSED, thanks kubkon)
- [ziglang/zig [darwin x86_64 cgo] regression #10297](https://github.com/ziglang/zig/issues/10297) (CLOSED, thanks kubkon)
- [ziglang/zig #9431 FileNotFound when compiling macos](https://github.com/ziglang/zig/issues/9431) (CLOSED, thanks andrewrk)
- [rules/go #2894 Per-arch_target linker flags](https://github.com/bazelbuild/rules_go/issues/2894) (CLOSED, thanks mjonaitis)
- [ziglang/zig #7915 ar-compatible command for zig cc](https://github.com/ziglang/zig/issues/7915) (CLOSED, thanks andrewrk)
- [ziglang/zig #7917 [meta] better c/c++ toolchain compatibility](https://github.com/ziglang/zig/issues/7917) (CLOSED, thanks andrewrk)
- [ziglang/zig #9050 golang linker segfault](https://github.com/ziglang/zig/issues/9050) (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)
- [ziglang/zig #9139 zig c++ hanging when compiling in parallel](https://github.com/ziglang/zig/issues/9139) (CLOSED, thanks andrewrk)
# Testing
@ -167,6 +155,21 @@ $ docker run -e CC=/usr/bin/false -ti --rm -v $(pwd):/x -w /x debian:bullseye-sl
And run the `bazel build` commands above. Take a look at `.build.yml` and see
how CI does it.
# Future & Roadmap
This section lists things that I think will happen at some point: either by
myself, or my colleagues, or outside contributors.
* Move Zig cache path to bazel root, so `bazel clean --expunge` clears the zig
cache.
* Provide a way to specify alternative URLs for the zig toolchain (currently
zig is downloaded from jakstys.lt, which is nuts).
* Rename `@zig_sdk//:<toolchain>_toolchain` to
`@zig_sdk//toolchain:<toolchain>` or similar; so the user-facing targets are
in their own namespace.
* Provide a way to specify sysroot for Darwin (OSX). See [#Compiling OS X
executables](#compiling-os-x-executables) for an ongoing discussion.
# Contribution guidelines
Contributions are accepted via patches to the mailing list
@ -177,12 +180,14 @@ Contributions are accepted via patches to the mailing list
Copyright is retained by the contributors.
# Credits
# Thanks
Many thanks to Adam Bouhenguel and his [bazel-zig-cc][ajbouh], the parent of
this repository.
this repository. Also, the Zig team for making this all possible and handling
the issues promptly.
[mailing-list]: mailto:~motiejus/bazel-zig-cc@lists.sr.ht
[ajbouh]: https://github.com/ajbouh/bazel-zig-cc/
[git-send-email]: https://git-send-email.io/
[video]: https://spacepub.space/w/no6jnhHeUrt2E5ST168tRL
[sysroot]: https://github.com/ziglang/zig/issues/10299#issuecomment-989153750