[bazel] Update to 7.x

[keith]

No description provided.

[aaronmondal]

Cool! I'll also take another look at #55924.

[durin42]

This seems to be pretty broken (included both links because for some reason the first run including this change truncated the output) on the buildkite for bazel - I can reproduce locally with USE_BAZEL_VERSION=7.1.1 bazelisk build --config=ci --config=generic_clang @llvm-project//llvm/unittests:SupportTests which fails like this:

ERROR: [...]llvm-project/llvm/unittests/BUILD.bazel:633:8: Compiling llvm/unittests/Support/DebugTest.cpp failed: undeclared inclusion(s) in rule '@@llvm-project//llvm/unittests:SupportTests':
this rule is missing dependency declarations for the following files included by 'llvm/unittests/Support/DebugTest.cpp':
  'bazel-out/k8-fastbuild/bin/external/llvm-project/llvm/Demangle.cppmap'
  'bazel-out/k8-fastbuild/bin/external/llvm_zlib/zlib.cppmap'
  'bazel-out/k8-fastbuild/bin/external/llvm_zstd/zstd.cppmap'
  'bazel-out/k8-fastbuild/bin/external/llvm-project/llvm/BitstreamReader.cppmap'
[elided many more cppmap lines]

I don't know enough bazel to be of use here, but it seems like there must be a discrepancy in a rule implementation somehow?

[keith]

thanks for linking, merged a revert here to unblock #86325

do you know if there is a way I can run those CI jobs on my change? on my linux x86 machine with your command I don't see the same issue

[keith]

working on the reland + a fix here #86326

[durin42]

thanks for linking, merged a revert here to unblock #86325

do you know if there is a way I can run those CI jobs on my change? on my linux x86 machine with your command I don't see the same issue

I wish I did! It took some futzing to get it to reproduce for me, and while I thought the --config=ci was the magic I'm not entirely sure it was. I'll ask around if anyone can provide advice on a better way to reproduce. :/