during 'make install', pre-existing site-packages residents are recompiled. Twice.

[MattDMo]

BPO	27884
Nosy	@bitdancer, @MattDMo

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2016-08-28.14:53:14.003>
labels = ['extension-modules', 'build', 'expert-installation']
title = "during 'make install', pre-existing site-packages residents are recompiled. Twice."
updated_at = <Date 2016-08-28.15:09:22.717>
user = 'https://github.com/MattDMo'

bugs.python.org fields:

activity = <Date 2016-08-28.15:09:22.717>
actor = 'r.david.murray'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Build', 'Extension Modules', 'Installation']
creation = <Date 2016-08-28.14:53:14.003>
creator = 'MattDMo'
dependencies = []
files = []
hgrepos = []
issue_num = 27884
keywords = []
message_count = 2.0
messages = ['273824', '273825']
nosy_count = 2.0
nosy_names = ['r.david.murray', 'MattDMo']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue27884'
versions = ['Python 3.6']

[MattDMo]

I've been building Python 3 from source on Linux for a long time (at least since 3.2 days), and I honestly can't remember if this has happened before 3.6 or not, which is why I'm only tagging this 3.6.

Basically, when running 'make install' (after building either static or shared, I haven't been messing around with any other options except install prefix - $HOME) you'll start seeing messages like:

=====
Listing '/home/mattdmo/lib/python3.6/site-packages/statsmodels/sandbox/regression'...
Compiling '/home/mattdmo/lib/python3.6/site-packages/statsmodels/sandbox/regression/init.py'...
Compiling '/home/mattdmo/lib/python3.6/site-packages/statsmodels/sandbox/regression/anova_nistcertified.py'...
Compiling '/home/mattdmo/lib/python3.6/site-packages/statsmodels/sandbox/regression/ar_panel.py'...
Compiling '/home/mattdmo/lib/python3.6/site-packages/statsmodels/sandbox/regression/example_kernridge.py'...
Compiling '/home/mattdmo/lib/python3.6/site-packages/statsmodels/sandbox/regression/gmm.py'...
Compiling '/home/mattdmo/lib/python3.6/site-packages/statsmodels/sandbox/regression/kernridgeregress_class.py'...
Compiling '/home/mattdmo/lib/python3.6/site-packages/statsmodels/sandbox/regression/ols_anova_original.py'...
Compiling '/home/mattdmo/lib/python3.6/site-packages/statsmodels/sandbox/regression/onewaygls.py'...
Compiling '/home/mattdmo/lib/python3.6/site-packages/statsmodels/sandbox/regression/penalized.py'...
Compiling '/home/mattdmo/lib/python3.6/site-packages/statsmodels/sandbox/regression/predstd.py'...
Compiling '/home/mattdmo/lib/python3.6/site-packages/statsmodels/sandbox/regression/runmnl.py'...
Compiling '/home/mattdmo/lib/python3.6/site-packages/statsmodels/sandbox/regression/sympy_diff.py'...
Listing '/home/mattdmo/lib/python3.6/site-packages/statsmodels/sandbox/regression/tests'...
Compiling '/home/mattdmo/lib/python3.6/site-packages/statsmodels/sandbox/regression/tests/init.py'...
=====

and on and on and on. I usually don't pay much attention to them, but since I have nothing better to do I just stare idly at them and watch as all my third-party modules in 'site-packages' scroll by in alphabetical order very quickly. For the last few builds of 3.6, though, I've noticed that the modules get gone through twice. I have a pretty large number of modules (341, according to ls | wc -l), so it takes a while to go through them, and they're definitely being repeated.

Unfortunately, I don't know a whole lot about Makefiles or the internals of the installation process, so I don't have the slightest idea of where to begin even looking for the bug. But, I bet you ladies and gentlemen do :)

If it's necessary, I can rebuild and pipe all the output into a file for you to examine. Just let me know.

[bitdancer]

As far as I can tell, this is working as designed, and in fact you ought to see site-packages getting compiled *three* times (normal, -O, and -OO).

I wonder if this is a holdover from when we didn't have per-interpreter pyc files, and its just that no one noticed the need for recompile of site-packages didn't exist any more. On the other hand, I may be missing some piece of logic that means that it is still needed.