[PATCH] D108023: [flang][lit] Introduce `%python_b` in LIT configuration

[Andrzej Warzynski via Phabricator via llvm-commits]

awarzynski created this revision.
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In order to prevent Python from generating the __pycache__ directory, we
need to pass the `-B` flag [1]. To this end, a new LIT variable is
introduced, `%python_b`, that expands to `python -B`.

This is currently only required in Flang as it uses
flang/test/Semantics/common.py that's imported in tests that use
`%python`. In order to speed-up re-use, this Python module is
pre-compiled by-default and saved in `flang/test/Semantics/__pycache__`.

This was brought up in a post-commit review in [2]

[1] https://docs.python.org/3/using/cmdline.html#id1
[2] https://reviews.llvm.org/D107041


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D108023

Files:
  flang/test/Semantics/OpenACC/acc-symbols01.f90
  flang/test/Semantics/kinds01.f90
  flang/test/Semantics/kinds03.f90
  flang/test/Semantics/omp-do-schedule03.f90
  flang/test/Semantics/omp-do-schedule04.f90
  flang/test/Semantics/omp-do01-positivecase.f90
  flang/test/Semantics/omp-do04-positivecase.f90
  flang/test/Semantics/omp-do05-positivecase.f90
  flang/test/Semantics/omp-do06-positivecases.f90
  flang/test/Semantics/omp-do11.f90
  flang/test/Semantics/omp-do12.f90
  flang/test/Semantics/omp-do14.f90
  flang/test/Semantics/omp-do17.f90
  flang/test/Semantics/omp-reduction08.f90
  flang/test/Semantics/omp-reduction09.f90
  flang/test/Semantics/omp-symbol01.f90
  flang/test/Semantics/omp-symbol02.f90
  flang/test/Semantics/omp-symbol03.f90
  flang/test/Semantics/omp-symbol04.f90
  flang/test/Semantics/omp-symbol05.f90
  flang/test/Semantics/omp-symbol06.f90
  flang/test/Semantics/omp-symbol07.f90
  flang/test/Semantics/omp-symbol08.f90
  flang/test/Semantics/procinterface01.f90
  flang/test/Semantics/symbol01.f90
  flang/test/Semantics/symbol02.f90
  flang/test/Semantics/symbol03.f90
  flang/test/Semantics/symbol05.f90
  flang/test/Semantics/symbol06.f90
  flang/test/Semantics/symbol07.f90
  flang/test/Semantics/symbol08.f90
  flang/test/Semantics/symbol09.f90
  flang/test/Semantics/symbol10.f90
  flang/test/Semantics/symbol11.f90
  flang/test/Semantics/symbol12.f90
  flang/test/Semantics/symbol13.f90
  flang/test/Semantics/symbol14.f90
  flang/test/Semantics/symbol15.f90
  flang/test/Semantics/symbol16.f90
  flang/test/Semantics/symbol17.f90
  flang/test/Semantics/symbol18.f90
  flang/test/Semantics/symbol19.f90
  flang/test/lit.cfg.py

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