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[clang-tidy] Handle missing yaml module in run-clang-tidy.py

Authored by zinovy.nis on Mar 27 2019, 12:21 PM.

Description

[clang-tidy] Handle missing yaml module in run-clang-tidy.py

The Yaml module is missing on some systems and on many of clang buildbots.
But the test for run-clang-tidy.py doesn't fail due to 'NOT' statement masking a python runtime error.

This patch conditionally imports and enables the yaml module only if it's present in the system.
If not, then '-export-fixes' is disabled.

Differential Revision: https://reviews.llvm.org/D59734

llvm-svn: 357114

Details