Build fails on Windows

[kschzt]

Hi, the build fails with duplicate declarations as below. Running in Windows 11 Pro in a Git Bash (as the build requires bash for patching). Any clues as to how to fix?

$ bazel build -- ///bare:bare
DEBUG: C:/users/kschz/_bazel_kschz/u6fkmli4/external/com_github_bazelbuild_remote_apis/repository_rules.bzl:12:10: The switched_rules_by_language macro is deprecated. Consumers of @bazel_remote_apis should specify per-language dependencies in their own workspace.
INFO: Analyzed target //bare:bare (0 packages loaded, 0 targets configured).
INFO: Found 1 target...
ERROR: C:/users/kschz/_bazel_kschz/u6fkmli4/external/com_github_buildbarn_go_xdr/pkg/compiler/parser/BUILD.bazel:10:11: GoCompilePkg external/com_github_buildbarn_go_xdr/pkg/compiler/parser/parser.a [for host] failed: (Exit 1): builder.exe failed: error executing command bazel-out\host\bin\external\go_sdk\builder.exe compilepkg -sdk external/go_sdk -installsuffix windows_amd64 -src external/com_github_buildbarn_go_xdr/pkg/compiler/parser/xdr_base_listener.go -src ... (remaining 37 arguments skipped)
bazel-out\host\bin\external\com_github_buildbarn_go_xdr\pkg\compiler\parser\xdr.go\xdr_base_listener.go:8:6: BaseXDRListener redeclared in this block
        external\com_github_buildbarn_go_xdr\pkg\compiler\parser\xdr_base_listener.go:8:6: other declaration of BaseXDRListener
bazel-out\host\bin\external\com_github_buildbarn_go_xdr\pkg\compiler\parser\xdr.go\xdr_lexer.go:18:6: XDRLexer redeclared in this block
        external\com_github_buildbarn_go_xdr\pkg\compiler\parser\xdr_lexer.go:21:6: other declaration of XDRLexer
bazel-out\host\bin\external\com_github_buildbarn_go_xdr\pkg\compiler\parser\xdr.go\xdr_lexer.go:25:5: xdrlexerLexerStaticData redeclared in this block
        external\com_github_buildbarn_go_xdr\pkg\compiler\parser\xdr_lexer.go:28:5: other declaration of xdrlexerLexerStaticData
bazel-out\host\bin\external\com_github_buildbarn_go_xdr\pkg\compiler\parser\xdr.go\xdr_lexer.go:38:6: xdrlexerLexerInit redeclared in this block
        external\com_github_buildbarn_go_xdr\pkg\compiler\parser\xdr_lexer.go:41:6: other declaration of xdrlexerLexerInit
bazel-out\host\bin\external\com_github_buildbarn_go_xdr\pkg\compiler\parser\xdr.go\xdr_lexer.go:237:6: XDRLexerInit redeclared in this block
        external\com_github_buildbarn_go_xdr\pkg\compiler\parser\xdr_lexer.go:240:6: other declaration of XDRLexerInit
bazel-out\host\bin\external\com_github_buildbarn_go_xdr\pkg\compiler\parser\xdr.go\xdr_lexer.go:243:6: NewXDRLexer redeclared in this block
        external\com_github_buildbarn_go_xdr\pkg\compiler\parser\xdr_lexer.go:246:6: other declaration of NewXDRLexer
bazel-out\host\bin\external\com_github_buildbarn_go_xdr\pkg\compiler\parser\xdr.go\xdr_lexer.go:262:2: XDRLexerT__0 redeclared in this block
        external\com_github_buildbarn_go_xdr\pkg\compiler\parser\xdr_lexer.go:265:2: other declaration of XDRLexerT__0
bazel-out\host\bin\external\com_github_buildbarn_go_xdr\pkg\compiler\parser\xdr.go\xdr_lexer.go:263:2: XDRLexerT__1 redeclared in this block
        external\com_github_buildbarn_go_xdr\pkg\compiler\parser\xdr_lexer.go:266:2: other declaration of XDRLexerT__1
bazel-out\host\bin\external\com_github_buildbarn_go_xdr\pkg\compiler\parser\xdr.go\xdr_lexer.go:264:2: XDRLexerT__2 redeclared in this block
        external\com_github_buildbarn_go_xdr\pkg\compiler\parser\xdr_lexer.go:267:2: other declaration of XDRLexerT__2
bazel-out\host\bin\external\com_github_buildbarn_go_xdr\pkg\compiler\parser\xdr.go\xdr_lexer.go:265:2: XDRLexerT__3 redeclared in this block
        external\com_github_buildbarn_go_xdr\pkg\compiler\parser\xdr_lexer.go:268:2: other declaration of XDRLexerT__3
bazel-out\host\bin\external\com_github_buildbarn_go_xdr\pkg\compiler\parser\xdr.go\xdr_lexer.go:265:2: too many errors
compilepkg: error running subcommand external\go_sdk\pkg\tool\windows_amd64\compile.exe: exit status 2
Target //bare:bare failed to build
Use --verbose_failures to see the command lines of failed build steps.
INFO: Elapsed time: 0.442s, Critical Path: 0.08s
INFO: 4 processes: 4 internal.
FAILED: Build did NOT complete successfully

[moroten]

I don't have a Windows environment right now to try it out. Do you get the same error when building just https://github.com/buildbarn/go-xdr?

[kschzt]

@moroten No errors building that with bazel build //cmd/xdr_compiler.

[kschzt]

PS. FYI I'm setting up a Windows RBE cluster for building Chromium with goma (natively), and buildbarn is the best on Linux (4 machines, 256 cores) – I tried all the OS RBE solutions – so I'd love to get this to work on Windows! 😊

[EdSchouten]

You’re seeing this error, because it reran Gazelle in the go-xdr repo, which causes it to also build the generated source files.

[kschzt]

@EdSchouten thanks. I'm pretty new to bazel. How can I tell it not to do that? And what makes it (only) do that on Windows? Thanks again!

[kschzt]

Using bazel 5.3.1 btw.

[kschzt]

I've worked around this by building the rbe and storage repos separately - they build just fine.

[moroten]

Good to hear that it works for you. I'll keep this ticket open to see if I can have a look at it in a few months time.

[kschzt]

FYI I then failed at Failed to create Content Addressable Storage: rpc error: code = Unimplemented desc = Failed to open blocks block device: Memory mapping block devices is not supported on this platform which is another thing entirely :)

[EdSchouten]

@EdSchouten thanks. I'm pretty new to bazel. How can I tell it not to do that? And what makes it (only) do that on Windows? Thanks again!

In go_dependencies.bzl you will find something like this:

    go_repository(
        name = "com_github_buildbarn_go_xdr",
        importpath = "github.com/buildbarn/go-xdr",
        sum = "h1:aVYAcBUakcn8QvCdKroXmjGjQBBqv3FLftTyiHjgKAQ=",
        version = "v0.0.0-20220804060714-a6fffae29b77",
    )

You could try adding build_file_generation = "off", to that. That will force it to use the BUILD files that are already in the repository.