<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<div class="moz-cite-prefix">+1 to what Chris and Justin said.<br>
<br>
I see no strong benefit to moving to python3 and substantial
costs.<br>
<br>
Philip<br>
<br>
On 01/30/2018 11:20 AM, Chris Matthews via llvm-dev wrote:<br>
</div>
<blockquote type="cite"
cite="mid:3B8009A6-7512-4216-A018-2D92D6369AFD@apple.com">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<div class="">Personally, every machine I work with only has
Python 2.7.</div>
<div class=""><br class="">
</div>
Justin is correct that there is a non-trivial amount of effort to
convert the bots.
<div class=""><br class="">
</div>
<div class="">Python 3 is wonderful. But, a Python 3 dependency
seems like one burden that could be avoided. We have already
made that trade-off in the past, for example by only using
standard python packages, so there is less/nothing to pip
install when getting started. Dependencies likes host compiler
and cmake totally make sense given they are central to how LLVM
is made. I don’t think the same for the python code.</div>
<div class=""><br class="">
</div>
<div class="">I’m in favor of 2/3 compatibility until the death
clock ends.<br class="">
<div><br class="">
<blockquote type="cite" class="">
<div class="">On Jan 30, 2018, at 4:48 AM, 陳韋任 via llvm-dev
<<a href="mailto:llvm-dev@lists.llvm.org" class=""
moz-do-not-send="true">llvm-dev@lists.llvm.org</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<div dir="ltr" class="">
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif">Does
Python 3 have feature we want to use in LLVM codebase,
and no workaround there? If so, please give some
examples. I think that makes the discussion more
concrete.</div>
</div>
<div class="gmail_extra"><br class="">
<div class="gmail_quote">2018-01-30 4:46 GMT+08:00
Fāng-ruì Sòng via llvm-dev <span dir="ltr" class=""><<a
href="mailto:llvm-dev@lists.llvm.org"
target="_blank" class="" moz-do-not-send="true">llvm-dev@lists.llvm.org</a>></span>:<br
class="">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hi
LLVM-Devs,<br class="">
<br class="">
I noticed that many Python scripts under utils/ have
a shebang of<br class="">
`#!/usr/bin/python` (which is a symlink to python2.7
on many platforms) and some of them use Python 2
syntax that is not compatible with Python 3 (e.g.
print statements; str/bytes)<br class="">
<br class="">
I created a revision to migrate
utils/update_{llc_,}_test_chec<wbr class="">ks.py
from Python 2 to Python 3 <a
href="https://reviews.llvm.org/D42450"
rel="noreferrer" target="_blank" class=""
moz-do-not-send="true">https://reviews.llvm.org/D4245<wbr
class="">0</a> , the arguments against making it
Python 3 is:<br class="">
<br class="">
* There are many Mac OS X users and Mac OS X 10.8
comes with Python 2.7 pre-installed [0] but not
Python 3.<br class="">
* Forcing scripts to use Python 3 (by doing so we
can avoid some compatibility trouble) may not be a
good idea.<br class="">
<br class="">
Python 2.7 was published in 2010 and planned as the
last of the 2.x releases. It will not be maintained
past 2020 and there is also a retirement page <a
href="https://pythonclock.org/" rel="noreferrer"
target="_blank" class="" moz-do-not-send="true">https://pythonclock.org/</a>
.<br class="">
<br class="">
The second argument would not need to be addressed
if the first one did not lay too much burden on
developers. After all, we have to install `cmake,
ninja/GNU Make / libedit(for lldb)` to build LLVM.
These packages are not installed by default on many
platforms.<br class="">
<br class="">
Thoughts on deprecating Python 2 for utils/ scripts
(different from libclang or lldb scripts) which are
not user-facing?<br class="">
<br class="">
[0]: <a
href="https://docs.python.org/3/using/mac.html#getting-and-installing-macpython"
rel="noreferrer" target="_blank" class=""
moz-do-not-send="true">https://docs.python.org/3/usin<wbr
class="">g/mac.html#getting-and-install<wbr
class="">ing-macpython</a><br class="">
<br class="">
<br class="">
Thanks,<br class="">
Fangrui<br class="">
______________________________<wbr class="">_________________<br
class="">
LLVM Developers mailing list<br class="">
<a href="mailto:llvm-dev@lists.llvm.org"
target="_blank" class="" moz-do-not-send="true">llvm-dev@lists.llvm.org</a><br
class="">
<a
href="http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev"
rel="noreferrer" target="_blank" class=""
moz-do-not-send="true">http://lists.llvm.org/cgi-bin/<wbr
class="">mailman/listinfo/llvm-dev</a><br
class="">
</blockquote>
</div>
<br class="">
<br class="" clear="all">
<div class=""><br class="">
</div>
-- <br class="">
<div class="gmail_signature"
data-smartmail="gmail_signature">
<div dir="ltr" class="">
<div class="">Wei-Ren Chen (陳韋任)<br class="">
Homepage: <a
href="https://people.cs.nctu.edu.tw/%7Echenwj"
target="_blank" class="" moz-do-not-send="true">https://people.cs.nctu.edu.tw/~chenwj</a></div>
</div>
</div>
</div>
_______________________________________________<br
class="">
LLVM Developers mailing list<br class="">
<a href="mailto:llvm-dev@lists.llvm.org" class=""
moz-do-not-send="true">llvm-dev@lists.llvm.org</a><br
class="">
<a class="moz-txt-link-freetext" href="http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev">http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev</a><br
class="">
</div>
</blockquote>
</div>
<br class="">
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
LLVM Developers mailing list
<a class="moz-txt-link-abbreviated" href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a>
<a class="moz-txt-link-freetext" href="http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev">http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev</a>
</pre>
</blockquote>
<p><br>
</p>
</body>
</html>