Hi devs, 

I'm working on a new QGIS feature and wanted to add a new API in core module. I 
get a strange error when building, on a class not related to what I am adding.

/home/julien/work/QGIS/build_debug/python/core/sip_corepart11.cpp:272:67: 
error: no type named 'QgsOptionalQgsExpressionBase' in the global namespace; 
did you mean 'QgsOptionalExpression'?
     ::QgsOptionalQgsExpressionBase *sipCpp = reinterpret_cast< 
::QgsOptionalQgsExpressionBase *>(sipGetCppPtr((sipSimpleWrapper 
*)sipSelf,sipType_QgsOptionalQgsExpressionBase));

It said that QgsOptionalExpressionBase is not defined in
sip_corepart_11.cpp, but the typedef is actually in sip_corepart_10.cpp,
at the end of the file.

>From what I understand, CMakeList variable SIP_CONCAT_PARTS allows to
split the SIP generated cpp code in several module, but in this case it
looks like split happens on a bad location (typedef on one side, part of
the code on the other side).

If I set SIP_CONCAT_PARTS to 1, it works.

Has anyone already facing this kind of issue? Is there some sort of instruction 
that I should be aware of to solve this?

I'm on master, Debian Bullseye, SIP 4.19.25

Kind regards,
Julien
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