Support multiple copies of toolchain

[skeggse]

I need Zig 0.14 for some of my targets, and Zig 0.12 for other targets due to incompatibilities. Ideally, I'd just use Zig 0.14 for everything, but that's not possible yet.

I figured I might be able to just have two copies of the cc toolchain, and tried to set both up. Unfortunately, I'm running into the following error:

$ bazel test //:test
ERROR: /private/var/tmp/_bazel_eliskeggs/e580cc93b7a734e8234364ad5cffaba6/external/hermetic_cc_toolchain_zig_0_14/toolchain/defs.bzl:251:13: An error occurred during the fetch of repository 'zig_config':
   Traceback (most recent call last):
	File "/private/var/tmp/_bazel_eliskeggs/e580cc93b7a734e8234364ad5cffaba6/external/hermetic_cc_toolchain_zig_0_14/toolchain/defs.bzl", line 251, column 13, in _zig_repository_impl
		fail(zig_wrapper_err_msg)
Error in fail:
Compilation of zig-wrapper.zig failed:
command=ZIG_LOCAL_CACHE_DIR=/var/tmp/zig-cache ZIG_GLOBAL_CACHE_DIR=/var/tmp/zig-cache ../zig build-exe -target aarch64-macos-none -mcpu=apple_a14 -fstrip -OReleaseSafe zig-wrapper.zig
return_code=1
stderr=zig-wrapper.zig:96:32: error: root struct of file 'std' has no member named 'StaticStringMap'
/private/var/tmp/_bazel_eliskeggs/e580cc93b7a734e8234364ad5cffaba6/external/zig_config/lib/std/std.zig:1:1: note: struct declared here

stdout=

You stumbled into a problem with Zig SDK that hermetic_cc_toolchain was not
able to fix. This is most likely a long-standing problem mostly (only?)
observed in OSX. Please please add a comment to
https://github.com/ziglang/zig/issues/18763 with:
- Output of `bazel run @zig_sdk//:zig version`
- Full output of this Bazel run, including the Bazel command.
- Full OS version and hardware revision (e.g. aarch64 or x86_64?).

Zig and hermetic_cc_toolchain maintainers aren't able to reproduce it, but you
are. Thus we need a bit of your collaboration to get to the bottom of it.

After commenting on the issue, `rm -fr /var/tmp/zig-cache` and re-run your command.
ERROR: no such package '@@zig_config//':
Compilation of zig-wrapper.zig failed:
command=ZIG_LOCAL_CACHE_DIR=/var/tmp/zig-cache ZIG_GLOBAL_CACHE_DIR=/var/tmp/zig-cache ../zig build-exe -target aarch64-macos-none -mcpu=apple_a14 -fstrip -OReleaseSafe zig-wrapper.zig
return_code=1
stderr=zig-wrapper.zig:96:32: error: root struct of file 'std' has no member named 'StaticStringMap'
/private/var/tmp/_bazel_eliskeggs/e580cc93b7a734e8234364ad5cffaba6/external/zig_config/lib/std/std.zig:1:1: note: struct declared here

stdout=

You stumbled into a problem with Zig SDK that hermetic_cc_toolchain was not
able to fix. This is most likely a long-standing problem mostly (only?)
observed in OSX. Please please add a comment to
https://github.com/ziglang/zig/issues/18763 with:
- Output of `bazel run @zig_sdk//:zig version`
- Full output of this Bazel run, including the Bazel command.
- Full OS version and hardware revision (e.g. aarch64 or x86_64?).

Zig and hermetic_cc_toolchain maintainers aren't able to reproduce it, but you
are. Thus we need a bit of your collaboration to get to the bottom of it.

After commenting on the issue, `rm -fr /var/tmp/zig-cache` and re-run your command.
ERROR: /private/var/tmp/_bazel_eliskeggs/e580cc93b7a734e8234364ad5cffaba6/external/zig_sdk/toolchain/BUILD:7:19: @@zig_sdk//toolchain:linux_amd64_gnu.2.31 depends on @@zig_config//:exec_cpu in repository @@zig_config which failed to fetch. no such package '@@zig_config//':
Compilation of zig-wrapper.zig failed:
command=ZIG_LOCAL_CACHE_DIR=/var/tmp/zig-cache ZIG_GLOBAL_CACHE_DIR=/var/tmp/zig-cache ../zig build-exe -target aarch64-macos-none -mcpu=apple_a14 -fstrip -OReleaseSafe zig-wrapper.zig
return_code=1
stderr=zig-wrapper.zig:96:32: error: root struct of file 'std' has no member named 'StaticStringMap'
/private/var/tmp/_bazel_eliskeggs/e580cc93b7a734e8234364ad5cffaba6/external/zig_config/lib/std/std.zig:1:1: note: struct declared here

stdout=

You stumbled into a problem with Zig SDK that hermetic_cc_toolchain was not
able to fix. This is most likely a long-standing problem mostly (only?)
observed in OSX. Please please add a comment to
https://github.com/ziglang/zig/issues/18763 with:
- Output of `bazel run @zig_sdk//:zig version`
- Full output of this Bazel run, including the Bazel command.
- Full OS version and hardware revision (e.g. aarch64 or x86_64?).

Zig and hermetic_cc_toolchain maintainers aren't able to reproduce it, but you
are. Thus we need a bit of your collaboration to get to the bottom of it.

After commenting on the issue, `rm -fr /var/tmp/zig-cache` and re-run your command.

Output of bazel run @zig_sdk//:zig version:

DEBUG: /private/var/tmp/_bazel_eliskeggs/e580cc93b7a734e8234364ad5cffaba6/external/hermetic_cc_toolchain_zig_0_14/toolchain/defs.bzl:228:18: Launcher compilation failed. Retrying build
DEBUG: /private/var/tmp/_bazel_eliskeggs/e580cc93b7a734e8234364ad5cffaba6/external/hermetic_cc_toolchain_zig_0_14/toolchain/defs.bzl:228:18: Launcher compilation failed. Retrying build
INFO: Repository zig_config instantiated at:
  /Users/eliskeggs/src/bazel-aws-lc-repro/WORKSPACE:110:20: in <toplevel>
  /private/var/tmp/_bazel_eliskeggs/e580cc93b7a734e8234364ad5cffaba6/external/hermetic_cc_toolchain_zig_0_14/toolchain/defs.bzl:90:19: in toolchains
Repository rule zig_repository defined at:
  /private/var/tmp/_bazel_eliskeggs/e580cc93b7a734e8234364ad5cffaba6/external/hermetic_cc_toolchain_zig_0_14/toolchain/defs.bzl:273:33: in <toplevel>
INFO: repository @@zig_config' used the following cache hits instead of downloading the corresponding file.
 * Hash '294e224c14fd0822cfb15a35cf39aa14bd9967867999bf8bdfe3db7ddec2a27f' for https://mirror.bazel.build/ziglang.org/download/0.12.0/zig-macos-aarch64-0.12.0.tar.xz
If the definition of 'repository @@zig_config' was updated, verify that the hashes were also updated.
ERROR: /private/var/tmp/_bazel_eliskeggs/e580cc93b7a734e8234364ad5cffaba6/external/hermetic_cc_toolchain_zig_0_14/toolchain/defs.bzl:251:13: An error occurred during the fetch of repository 'zig_config':
   Traceback (most recent call last):
	File "/private/var/tmp/_bazel_eliskeggs/e580cc93b7a734e8234364ad5cffaba6/external/hermetic_cc_toolchain_zig_0_14/toolchain/defs.bzl", line 251, column 13, in _zig_repository_impl
		fail(zig_wrapper_err_msg)
Error in fail:
Compilation of zig-wrapper.zig failed:
command=ZIG_LOCAL_CACHE_DIR=/var/tmp/zig-cache ZIG_GLOBAL_CACHE_DIR=/var/tmp/zig-cache ../zig build-exe -target aarch64-macos-none -mcpu=apple_a14 -fstrip -OReleaseSafe zig-wrapper.zig
return_code=1
stderr=zig-wrapper.zig:96:32: error: root struct of file 'std' has no member named 'StaticStringMap'
/private/var/tmp/_bazel_eliskeggs/e580cc93b7a734e8234364ad5cffaba6/external/zig_config/lib/std/std.zig:1:1: note: struct declared here

stdout=

You stumbled into a problem with Zig SDK that hermetic_cc_toolchain was not
able to fix. This is most likely a long-standing problem mostly (only?)
observed in OSX. Please please add a comment to
https://github.com/ziglang/zig/issues/18763 with:
- Output of `bazel run @zig_sdk//:zig version`
- Full output of this Bazel run, including the Bazel command.
- Full OS version and hardware revision (e.g. aarch64 or x86_64?).

Zig and hermetic_cc_toolchain maintainers aren't able to reproduce it, but you
are. Thus we need a bit of your collaboration to get to the bottom of it.

After commenting on the issue, `rm -fr /var/tmp/zig-cache` and re-run your command.
ERROR: no such package '@@zig_config//':
Compilation of zig-wrapper.zig failed:
command=ZIG_LOCAL_CACHE_DIR=/var/tmp/zig-cache ZIG_GLOBAL_CACHE_DIR=/var/tmp/zig-cache ../zig build-exe -target aarch64-macos-none -mcpu=apple_a14 -fstrip -OReleaseSafe zig-wrapper.zig
return_code=1
stderr=zig-wrapper.zig:96:32: error: root struct of file 'std' has no member named 'StaticStringMap'
/private/var/tmp/_bazel_eliskeggs/e580cc93b7a734e8234364ad5cffaba6/external/zig_config/lib/std/std.zig:1:1: note: struct declared here

stdout=

You stumbled into a problem with Zig SDK that hermetic_cc_toolchain was not
able to fix. This is most likely a long-standing problem mostly (only?)
observed in OSX. Please please add a comment to
https://github.com/ziglang/zig/issues/18763 with:
- Output of `bazel run @zig_sdk//:zig version`
- Full output of this Bazel run, including the Bazel command.
- Full OS version and hardware revision (e.g. aarch64 or x86_64?).

Zig and hermetic_cc_toolchain maintainers aren't able to reproduce it, but you
are. Thus we need a bit of your collaboration to get to the bottom of it.

After commenting on the issue, `rm -fr /var/tmp/zig-cache` and re-run your command.
ERROR: /private/var/tmp/_bazel_eliskeggs/e580cc93b7a734e8234364ad5cffaba6/external/zig_sdk/BUILD.bazel:6:6: @@zig_sdk//:zig depends on @@zig_config//:zig in repository @@zig_config which failed to fetch. no such package '@@zig_config//':
Compilation of zig-wrapper.zig failed:
command=ZIG_LOCAL_CACHE_DIR=/var/tmp/zig-cache ZIG_GLOBAL_CACHE_DIR=/var/tmp/zig-cache ../zig build-exe -target aarch64-macos-none -mcpu=apple_a14 -fstrip -OReleaseSafe zig-wrapper.zig
return_code=1
stderr=zig-wrapper.zig:96:32: error: root struct of file 'std' has no member named 'StaticStringMap'
/private/var/tmp/_bazel_eliskeggs/e580cc93b7a734e8234364ad5cffaba6/external/zig_config/lib/std/std.zig:1:1: note: struct declared here

stdout=

You stumbled into a problem with Zig SDK that hermetic_cc_toolchain was not
able to fix. This is most likely a long-standing problem mostly (only?)
observed in OSX. Please please add a comment to
https://github.com/ziglang/zig/issues/18763 with:
- Output of `bazel run @zig_sdk//:zig version`
- Full output of this Bazel run, including the Bazel command.
- Full OS version and hardware revision (e.g. aarch64 or x86_64?).

Zig and hermetic_cc_toolchain maintainers aren't able to reproduce it, but you
are. Thus we need a bit of your collaboration to get to the bottom of it.

After commenting on the issue, `rm -fr /var/tmp/zig-cache` and re-run your command.
ERROR: Analysis of target '@@zig_sdk//:zig' failed; build aborted: Analysis failed
INFO: Elapsed time: 13.927s, Critical Path: 0.00s
INFO: 1 process: 1 internal.
ERROR: Build did NOT complete successfully
ERROR: Build failed. Not running target

Running macOS 15.7 (24G222), aarch64.