Bug#1080061: CMake error due to wrong PCL_ROOT

[Jochen Sprickerhof]

Hi Timon,

* Timon Engelke <debian at timonengelke.de> [2024-08-30 10:32]:
>When building a CMake package using PCL on Ubuntu, I am getting the error
>
>CMake Error at /lib/x86_64-linux-gnu/cmake/pcl/PCLConfig.cmake:63 (message):
>  PCL can not be found on this machine
>Call Stack (most recent call first):
>  /lib/x86_64-linux-gnu/cmake/pcl/PCLConfig.cmake:459 (pcl_report_not_found)
>  CMakeLists.txt:19 (find_package)
>
>When investigating the issue, I found that PCL_ROOT is not set correctly in PCLConfig.cmake on line 439.
>It is set to / instead of /usr. The reason for that seems to be that the path of CMAKE_CURRENT_LIST_DIR is expected to be a subdirectory of /usr/lib, but it is a subdirectory of /lib.
>I was able to fix the issue by replacing the path relative to CMAKE_CURRENT_LIST_DIR by /usr.
>I believe that this is a Debian bug because there is already a Debian patch affecting exactly this line in PCLConfig.cmake.

This seems to be the same problem as 
https://bugs.launchpad.net/ubuntu/+source/pcl/+bug/1896118 which I still 
can't reproduce:

mmdebstrap --variant=apt --components=main,universe --include=g++,cmake,libpcl-dev --chrooted-customize-hook='echo "find_package(PCL)" > CMakeLists.txt; cmake .' noble /dev/null

What is the output of ls -l /lib on your system?

Cheers Jochen
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