[QGIS-Developer] No rule to make target 'src/core/qgis_core_autogen/mocs_compilation.cpp'

[Thomas Larsen Wessel]

Even when doing a dry run (the -n flag):

cd ~/b/QGIS
git switch release-3_36
git pull
git status -s # yep, its up to date
mkdir build-dry-3_36
cd build-dry-3_36
cmake .. > log_cmake.txt 2>&1
make -n > log_make.txt 2>&1

make fails with the following error:

(...)
cd /home/velle/b/QGIS/build-dry-3_36 && /usr/bin/cmake -E cmake_depends
"Unix Makefiles" /home/velle/b/QGIS /home/velle/b/QGIS/src/core
/home/velle/b/QGIS/build-dry-3_36
/home/velle/b/QGIS/build-dry-3_36/src/core
/home/velle/b/QGIS/build-dry-3_36/src/core/CMakeFiles/qgis_core.dir/DependInfo.cmake
--color=
make -s -f src/core/CMakeFiles/qgis_core.dir/build.make
src/core/CMakeFiles/qgis_core.dir/build
make[2]: *** No rule to make target
'src/core/qgis_core_autogen/mocs_compilation.cpp', needed by
'src/core/CMakeFiles/qgis_core.dir/qgis_core_autogen/mocs_compilation.cpp.o'.
Stop.
make[1]: *** [CMakeFiles/Makefile2:4401:
src/core/CMakeFiles/qgis_core.dir/all] Error 2
make: *** [Makefile:166: all] Error 2

This happens with both release-3_34, release-3_36 and master.
Using: Ubuntu 22.04, cmake 3.22.1, make 4.3.

I first set it up to run a non-dry, which also failed (after a few hours),
but unfortunately I discarded the error message. But I expect that if this
error arises in a dry run it will also arise in a non-dry run.

The odd thing is that I have compiled 3_36 before, and it feels like its no
more than a month ago, without any issues. I don't understand what changed,
if anything. But maybe I just forgot some detail this time?

log files here:
https://gist.github.com/velle/a9300a3e6d1a22f87ebbf913029efb6e

Any advice on what to do? Sincerely, Thomas
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