New submission from STINNER Victor <victor.stin...@gmail.com>:

/home/haypo/prog/python/3.5/Modules/expat/xmltok.c: In function 'utf8_toUtf8':
/home/haypo/prog/python/3.5/Modules/expat/xmltok.c:408:3: error: ISO C90 
forbids mixed declarations and code [-Werror=declaration-after-statement]
   const char * const fromLimBefore = fromLim;
   ^~~~~
/home/haypo/prog/python/3.5/Modules/expat/xmltok.c:414:3: error: ISO C90 
forbids mixed declarations and code [-Werror=declaration-after-statement]
   const ptrdiff_t bytesToCopy = fromLim - *fromP;
   ^~~~~
cc1: some warnings being treated as errors
*** WARNING: renaming "_elementtree" since importing it failed: 
PyCapsule_Import could not import module "pyexpat"


It's probably a regression caused by:

* Python 3.5: commit f2492bb6aae061aea47e21fc7e56b7ab9bfdf543
* Python 3.4: commit 86a713cb0c110b6798ca7f9e630fc511ee0a4028


I don't understand why the issue wasn't catched before. Maybe test_xml_etree is 
simply skipped if pyexpat compilation fails on Linux. Or buildbots and Travis 
CI uses ./configure --with-system-expat on Linux.

----------
components: Build
messages: 305705
nosy: haypo
priority: normal
severity: normal
status: open
title: [3.4][3.5] pyexpat: compilaton of libexpat fails with: ISO C90 forbids 
mixed declarations and code
type: security
versions: Python 3.4, Python 3.5

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<https://bugs.python.org/issue31964>
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