[PyQt] Having multiple SIP installations

[Kovid Goyal]

Thanks.

Couple of reasons for needing custom builds:

1) The system SIP is too old for the current PyQt5 release

2) I like to sometimes alter the source code and re-build to help me
understand how something works when I am investigating a new package. 

3) Generally when dealing with cutting edge packages I prefer not to
have them available system wide, just in case they cause problems with
other software on the system.

Kovid.

On Tue, Apr 15, 2014 at 05:27:31PM +0100, Phil Thompson wrote:
> On 11-04-2014 5:20 am, Kovid Goyal wrote:
> > Hi Phil,
> >
> > I have been investigating porting calibre to PyQt5/Qt5 and in order 
> > to
> > do that I needed to have a custom PyQt5/SIP build on my system 
> > alongside
> > the distribution provided one.
> >
> > My requirements are that I need to use:
> > 1) The system python interpreter
> > 2) A custom compiled Qt5, SIP and PyQt5. The custom SIP version is
> > different from the system SIP version.
> >
> > The problem is that the configure script for PyQt5 places the python
> > include dir before the sip include dir which causes the system sip.h 
> > to
> > be used, breaking the build. The relevant lines in configure.py are
> >
> >     if target_config.py_inc_dir != target_config.sip_inc_dir:
> >         pro_lines.append('INCLUDEPATH += %s' % 
> > target_config.sip_inc_dir)
> >
> > I can obviously patch it myself to do what I need, but I think it 
> > should
> > be changed to place the sip include dir before the python include 
> > dir,
> > if they differ. So the lines should be:
> >
> >     if target_config.py_inc_dir != target_config.sip_inc_dir:
> >         pro_lines.insert(len(pro_lines)-1, 'INCLUDEPATH += %s' %
> > target_config.sip_inc_dir)
> >
> > As far as I can see, this is the only way to build PyQt5 successfully
> > using the system python interpreter and a custom SIP, when the custom
> > SIP and the system SIP are of different versions.
> >
> > There may of course be other side effects that I do not realize.
> >
> > Thanks,
> >
> > Kovid.
> 
> Done.
> 
> Out of interest why to do you need custom builds?
> 
> Phil
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-- 
_____________________________________

Dr. Kovid Goyal 
http://www.kovidgoyal.net
http://calibre-ebook.com
_____________________________________
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