Brett Cannon added the comment:

The problem with the output is that error cases are unimportant and yet it 
fooled Skip into temporarily caring until he finally noticed the warning 
message. So my worry is that someone doesn't notice the "NOTE: ignore errors as 
they don't affect anything" and then glances at the output to notice an error 
and then worries that their PGO run failed.

It people really want to add output back in, though, they will need to patch 
both the Makefile to have a big NOTE in it as well as the README to say that 
any errors during the test suite run are unimportant and do not affect the 
outcome of the profile-guided optimizations.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue24915>
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