Work around a known race in Zig build system
More information in the commit message and https://github.com/ziglang/zig/issues/14815
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@ -45,16 +45,15 @@ return_code={return_code}
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stderr={stderr}
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stdout={stdout}
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You most likely hit a rare but known race in Zig SDK. Congratulations?
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You stumbled into a problem with Zig SDK that bazel-zig-cc was not able to fix.
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Please file a new issue to github.com/uber/bazel-zig-cc with:
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- Full output of this Bazel run, including the Bazel command.
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- Version of the Zig SDK if you have a non-default.
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- Version of bazel-zig-cc.
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We are working on fixing it with Zig Software Foundation. If you are curious,
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feel free to follow along in https://github.com/ziglang/zig/issues/14815
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There isn't much to do now but wait. Now apply the following workaround:
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$ rm -fr {cache_prefix}
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$ <... re-run your command ...>
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... and proceed with your life.
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Note: this *may* have been https://github.com/ziglang/zig/issues/14815, for
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which bazel-zig-cc has a workaround and you may have been "struck by lightning"
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three times in a row.
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"""
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def toolchains(
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@ -199,20 +198,50 @@ def _zig_repository_impl(repository_ctx):
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"launcher.zig",
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] + (["-static"] if os == "linux" else [])
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# The elaborate code below is a workaround for ziglang/zig#14815:
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# Sometimes, when Zig's cache is empty, compiling the launcher may fail
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# with `error: FileNotFound`. The remedy is to clear the cache and try
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# again. Until this change, we have been asking users to clear the Zig
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# cache themselves and re-run the Bazel command.
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#
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# We can do better than that: if we detect the launcher failed, we can
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# purge the zig cache and retry the compilation. It will be retried for up
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# to two times.
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launcher_success = True
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launcher_err_msg = ""
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for _ in range(3):
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# Do not remove the cache_prefix itself, because it is not controlled
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# by this script. Instead, clear the cache subdirs that we know Zig
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# populates.
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zig_cache_dirs = ["h", "o", "tmp", "z"]
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if not launcher_success:
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print("Launcher compilation failed. Clearing %s/{%s} and retrying" %
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(cache_prefix, ",".join(zig_cache_dirs)))
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for d in zig_cache_dirs:
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repository_ctx.delete(paths.join(cache_prefix, d))
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ret = repository_ctx.execute(
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compile_cmd,
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working_directory = "tools",
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environment = compile_env,
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)
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if ret.return_code != 0:
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if ret.return_code == 0:
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launcher_success = True
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break
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launcher_success = False
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full_cmd = [k + "=" + v for k, v in compile_env.items()] + compile_cmd
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fail(_compile_failed.format(
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launcher_err_msg = _compile_failed.format(
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compile_cmd = " ".join(full_cmd),
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return_code = ret.return_code,
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stdout = ret.stdout,
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stderr = ret.stderr,
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cache_prefix = cache_prefix,
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))
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)
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if not launcher_success:
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fail(launcher_err_msg)
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exe = ".exe" if os == "windows" else ""
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for target_config in target_structs():
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