New submission from Charles G.:

Environment:
Python 3.5.2
Visual Studio 2015 Update 2
Windows 7
amd64

I tried to build python with pgo (build.bat --pgo) but found that no  
python35!1.pgc or python!1.pgc was created. Then I run the tests one by one 
while checking the existence of python35!1.pgc and found that these tests when 
run prevents above pgcs from being created:

test_concurrent_futures
test_faulthandler
test_multiprocessing_main_handling
test_multiprocessing_spawn
test_os
test_subprocess

I'm not sure of the reason why no pgc is produced when running these tests.

----------
components: Windows
messages: 270374
nosy: Charles G., paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Some tests breaks PGO build on Windows
type: compile error
versions: Python 3.5

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27509>
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