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Actually, sip 4.19.7 which is shipped from Ubuntu 18.04 main repositories doesn't have a "-n" flag: as stated here https://www.riverbankcomputing.com/static/Docs/sip/command_line.html it was introduced in version 4.19.9.

This "-n" flag is used at line 542 (now) of file ./python/CMakeFiles/python_module_qgis__core.dir/build.make:

cd /opt/QGIS/build_master/python && /usr/bin/sip -w -e -x ANDROID -x ARM -x MOBILITY_LOCATION -n PyQt5.sip -t WS_X11 -t Qt_5_12_2 -g -o -a /opt/QGIS/build_master/python/qgis.core.api -y /opt/QGIS/build_master/output/python/qgis/_core.pyi -j 4 -c /opt/QGIS/build_master/python/core -I /opt/QGIS/build_master/python/core -I /usr/share/sip/PyQt5 -I /opt/QGIS/python /opt/QGIS/build_master/python/core/core.sip

It affects the master branch as well.

nicolas zzzz wrote:

Actually, sip 4.19.7 which is shipped from Ubuntu 18.04 main repositories doesn't have a "-n" flag: as stated here https://www.riverbankcomputing.com/static/Docs/sip/command_line.html it was introduced in version 4.19.9.

Known - therefore QGIS is only using -n starting with sip 4.19.11 - and builds on bionic are working fine. So it looks like a local issue.

Thanks for the hints.

Hmm, I thought the python package named PyQt5-sip from https://pypi.org/project/PyQt5-sip/ was probably making the search of SIP confused within the cmake-gui configuration step to build QGIS, so I removed it as its version from the pypi repository was 4.19.15 and the system sip from the bionic repositories is 4.19.7.

Then I force-reinstalled these two system packages with apt-get; python3-sip and python3-sip-dev to make sure everything is clean:

$ apt-get install --reinstall python3-sip python3-sip-dev
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  0 upgraded, 0 newly installed, 2 reinstalled, 0 to remove and 0 not upgraded.
  Need to get 0 B/97.2 kB of archives.
  After this operation, 0 B of additional disk space will be used.
  (Reading database ... 489083 files and directories currently installed.)
  Preparing to unpack .../python3-sip_4.19.7+dfsg-1_amd64.deb ...
  Unpacking python3-sip (4.19.7+dfsg-1) over (4.19.7+dfsg-1) ...
  Preparing to unpack .../python3-sip-dev_4.19.7+dfsg-1_amd64.deb ...
  Unpacking python3-sip-dev (4.19.7+dfsg-1) over (4.19.7+dfsg-1) ...
  Setting up python3-sip (4.19.7+dfsg-1) ... 
  Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
  Setting up python3-sip-dev (4.19.7+dfsg-1) ...

And I cleaned the QGIS build directory, before re-configuring the build.
But encountered this error at the 'configure' step in cmake-gui which is telling me it was OK with the pypi package but not the official Ubuntu ones (I double checked that all dependencies containing the word 'qt' or 'sip' are installed and it's the case):

Traceback (most recent call last):
  File "/opt/QGIS/cmake/FindPyQt5.py", line 34, in <module>
    import PyQt5.pyqtconfig
ModuleNotFoundError: No module named 'PyQt5.pyqtconfig'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/QGIS/cmake/FindPyQt5.py", line 37, in <module>
    import PyQt5.QtCore
ModuleNotFoundError: No module named 'PyQt5.sip'

Found SIP version: 4.19.7
Traceback (most recent call last):
  File "/opt/QGIS/cmake/FindQsci.py", line 45, in <module>
    from PyQt5.Qsci import QSCINTILLA_VERSION_STR
ModuleNotFoundError: No module named 'PyQt5.sip'

Some more information at this stage;

$ find /usr -iname "*sipconfig*" 
  /usr/lib/python3/dist-packages/sipconfig.py
  /usr/lib/python3/dist-packages/sipconfig_nd6.py
  /usr/lib/python3/dist-packages/__pycache__/sipconfig_nd6.cpython-36.pyc
  /usr/lib/python3/dist-packages/__pycache__/sipconfig.cpython-36.pyc

$ find /usr/bin -iname "*sip*" 
  /usr/bin/dh_sip
  /usr/bin/lsipc
  /usr/bin/sip
  /usr/bin/dh_sip3

$ find /usr/include/python3.6* -iname "*sip*" 
 /usr/include/python3.6dm/sip.h
 /usr/include/python3.6m/sip.h

$ sip -V
  4.19.7

$ which sip
  /usr/bin/sip

From a python3 console:

>>> import PyQt5.sip
    Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
    ModuleNotFoundError: No module named 'PyQt5.sip'

The question I am currently asking myself is; from which system package(s) do PyQt5.pyqtconfig and PyQt5.sip come from?

PS:
the if statement in file /opt/QGIS/cmake/FindSIP.py (this path is stored in variable _find_sip.py within cmake-gui): is returning me:

>>> import sipconfig
>>> 
>>> sipcfg = sipconfig.Configuration()
>>> print("sip_version:%06.0x" % sipcfg.sip_version)
    sip_version:041307
>>> print("sip_version_num:%d" % sipcfg.sip_version)
    sip_version_num:267015
>>> print("sip_version_str:%s" % sipcfg.sip_version_str)
    sip_version_str:4.19.7
>>> print("sip_bin:%s" % sipcfg.sip_bin)
    sip_bin:/usr/bin/sip
>>> print("default_sip_dir:%s" % sipcfg.default_sip_dir)
    default_sip_dir:/usr/share/sip
>>> print("sip_inc_dir:%s" % sipcfg.sip_inc_dir)
    sip_inc_dir:/usr/include/python3.6m
>>> if hasattr(sipcfg, "sip_module_dir"):
...     print("sip_module_dir:%s" % sipcfg.sip_module_dir)
... else:
...     print("sip_module_dir:%s" % sipcfg.sip_mod_dir)
... 
sip_module_dir:/usr/lib/python3.6/dist-packages

This last path doesn't exit on my system: /usr/lib/python3.6/dist-packages

$ ll /usr/lib/python3.6/dist-packages
  ls: cannot access '/usr/lib/python3.6/dist-packages': No such file or directory

But /usr/lib/python3.6/site-packages/ does exist ("site-packages" = OK, "dist-package" = NOT EXISTING...).
I also have a /usr/lib/python3/dist-packages directory here with "dist-packages" but not with "python3.6" in the directory name...

Strange.
So, what "sipcfg.sip_mod_dir" returns in python3 is not a valid path.
I think I should check from riverbank's side...

nicolas zzzz wrote:

Thanks for the hints.

Don't mix packages from debian and pypi. PyQt5 in debian/ubuntu used sip as sip module name and pypi probably PyQt5.sip - maybe that's your issue. Try building packages (3.8 in INSTALL).