[Python-Dev] Building against system expat

[Georg Brandl]

On 25.04.2012 15:42, Bohuslav Kabrda wrote:
> Hi, I'm trying to build Python 3.2.3 against system expat library, that lies
> out of the ordinary directory structure (under /opt). I also have an older
> version of expat library in the system. No matter what shell variables or
> options I pass to configure and make, pyexpat gets linked against the system
> expat, which results in errors during tests:
> 
> pyexpat.cpython-32dmu.so: undefined symbol: XML_SetHashSalt
> 
> anyone has any idea what to pass to configure/make to link pyexpat with the
> other expat?

You'll have to upgrade your expat.  The XML_SetHashSalt is new in 2.1.0 and
makes it possible to avoid an algorithmic complexity attack; Python uses it
in its newest bugfix releases.  See for example <http://bugs.python.org/issue14234>.

cheers,
Georg