[New-bugs-announce] [issue19521] parallel build race condition on AIX since python-3.2

[Michael Haubenwallner]

New submission from Michael Haubenwallner:

Since python-3.2, there is a race condition building in parallel on AIX:

Consider these Makefile(.pre.in) rules:

$(BUILDPYTHON): ...
  $(LINKCC) ... $(LINKFORSHARED) ...

Modules/_testembed: ...
  $(LINKCC) ... $(LINKFORSHARED) ...

Modules/_freeze_importlib: ...
  $(LINKCC) ...

On AIX, the variables get these values:

LINKCC = $(srcdir)/Modules/makexp_aix Modules/python.exp ...
LINKFORSHARED = -Wl,-bE:Modules/python.exp ...

Now $(BUILDPYTHON) and Modules/_testembed may run in parallel, causing Modules/python.exp to be created by two instances of makexp_aix eventually running at the same time.

Attached patch fixes this problem for cpython tip (doubt supporting AIX 4.1 and earlier still is necessary).

Thank you!

----------
components: Build
files: python-tip-aix-parallel.patch
keywords: patch
messages: 202357
nosy: haubi
priority: normal
severity: normal
status: open
title: parallel build race condition on AIX since python-3.2
versions: Python 3.2, Python 3.3, Python 3.4, Python 3.5
Added file: http://bugs.python.org/file32534/python-tip-aix-parallel.patch

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<http://bugs.python.org/issue19521>
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