CMake build: preserve PYTHONPATH

[adamjstewart]

Fixes #160092

I'm very new to CMake, so let me know if there's a fancier way to do this.

[pytorch-bot]

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❌ 1 New Failure, 9 Pending

As of commit fee0aab with merge base a53d14d ():

NEW FAILURE - The following job has failed:

• linux-binary-manywheel / manywheel-py3_11-cuda12_8-full-test / test (gh)
  ImportError: libnvshmem_host.so.3: cannot open shared object file: No such file or directory

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[malfet]

LGTM, but do you mind adding a test, otherwise it will regress next time someone will try to do the refactor

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[XuehaiPan]

@pytorchbot merge

[adamjstewart]

do you mind adding a test

How would I do this?

[pytorchmergebot]

Merge started

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[pytorchmergebot]

Merge failed

Reason: 1 jobs have failed, first few of them are: windows-binary-wheel / wheel-py3_13t-xpu-build

Details for Dev Infra team

Raised by workflow job

[XuehaiPan]

@pytorchbot merge -i

[pytorchmergebot]

Merge started

Your change will be merged while ignoring the following 1 checks: windows-binary-wheel / wheel-py3_13t-xpu-build

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[pytorchmergebot]

Merge failed

Reason: 1 jobs have failed, first few of them are: linux-binary-manywheel / manywheel-py3_11-cuda12_8-full-test / test

Details for Dev Infra team

Raised by workflow job

[malfet]

@pytorchbot merge -f "Everything is green"

[pytorchmergebot]

Merge started

Your change will be merged immediately since you used the force (-f) flag, bypassing any CI checks (ETA: 1-5 minutes). Please use -f as last resort and instead consider -i/--ignore-current to continue the merge ignoring current failures. This will allow currently pending tests to finish and report signal before the merge.

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