[Qgis-developer] Wiki page/area for 'Building QGIS from scratch'

[gordon at shieldaig.com]

Hi Mark,

I've opened a few issues on the Wiki.  Some I've sorted but others are 
not so straight forward - but there might be a simple way I am unaware 
of.  The main issues are that not all of the instructions, when used on 
Ubuntu 17.04 and I would think Ubuntu xx.x, result in `make install` 
installing locally without further pre-make modifications.

It would help me if you could look at SIP because I had that working 
previously to the system folders but would like to use the proper local 
installation and there is no `share` folder or error.

`site-packages` folder for both python 3.4 and python 3.5 contain:
`sipconfig.py sipdistutils.py  sip.pyi  sip.so`

Python 3.5.3 is installed, perhaps that is the problem.

Also, Qt5.7.1 is in the system folders but obviously building from 
source ensures Qt5.8.1 isn't used as I built Qt5.7.1 from source.  It 
took about 1 hour.  It is in the local install folders.

Thanks for any help.

On 2017-03-22 12:07, gordon at shieldaig.com wrote:
> On my Ubuntu 17.04 system in `/usr/lib/x86_64-linux-gnu/`:
> 
> `libQt5Core.so.5.7.1` exists
> `libQt5Core.so.5.7` is a symbolic link
> `libQt5Core.so.5` is a symbolic link
> `libQt5Core.so` is a symbolic link
> 
> what do you recommend?
> 
> 
> 
> On 2017-03-22 04:44, Mark Johnson wrote:
>>>> On Ubuntu 17.04, which is based on Qt5.7.1, output from
>>> 
>>>> `./output/bin/qgis`
>>> 
>>>> 
>>> 
>>>> `Couldn't load PyQt.
>>> 
>>>> Python support will be disabled. (a really big deal)
>>> 
>>>> 
>>> 
>>>> Traceback (most recent call last):
>>> 
>>>> File "", line 1, in
>>> 
>>>> ImportError: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5: version
>>>> `Qt_5.8'
>>> 
>>>> not found (required by
>>> 
>>>> /usr/local/lib/python3.5/dist-packages/PyQt5/QtCore.so)`
>> 
>> I have added a new page called 'Starting QGIS3 as seen from
>> lddtree.sh'
>> 
>> https://github.com/qgis/QGIS-Documentation/wiki/QGIS3-lddtree-sh
>> 
>> As is often the case, complex Applications often fail for many
>> different reasons.
>> This page show what steps where undertaken to resolve these problems.
>> 
>> lddtree.sh is a forked version of the original lddtree that, for me,
>> brings better result. (source and download link are supplied on that
>> page).
>> 
>> Here, in this case, it is important to check if both QGIS3 and
>> PyQt5/QtCore.so use the same libQt5Core.so.5
>> - I believe it is save to assume that both MUST use the same QT5
>> Version, since QtCore.so is a (I believe) a function interface between
>> python3 and libQt5Core
>> 
>> The page shows the result of both QGIS3 and PyQt5/QtCore.so (both of
>> which work correctly) as an comparison.
>> 
>> In this case, I think, the cause of the problem is more likly to be
>> that:
>> -> /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
>> --> does not exsit on your system
>> 
>> Mark
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