[PATCH 1/1] testsuite, btrace: update btrace testsuite to test all btrace recording methods

[Metzger, Markus T]

>>With this change, gdb.btrace will, instead of selecting the
>>default recording method, run all tests for all available and
>>applicable methods. This increases testing coverage.

Linux does not allow BTS and PT to be used at the same time.

This change, which was requested by Simon some time ago,
does not work with 'make check-parallel' when two gdb.btrace
tests are executed concurrently.

Is there a way to teach make check-parallel to run gdb.btrace
sequentially?

There are a few python tests that use btrace, but they could be
moved to gdb.btrace.

Regards,
Markus.

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