[pdal] Trouble compiling PDAL with MATLAB Plugin on Mac OS

[Howard Butler]

You can sometimes figure out what's going on by adding --debug-find to your CMake invocation (caution that it's noisy!)

> On Jun 3, 2024, at 10:06 AM, Patrick Rennich via pdal <pdal at lists.osgeo.org> wrote:
> 
> Thanks for the pointers. I pulled the latest FindMatlab.cmake from the cmake repository. This latest file has updates for Matlab 2024a which is what I’m using, but it doesn’t seem to help. I still get the same error.
>  
> Patrick
>  
> From: pdal <pdal-bounces at lists.osgeo.org> on behalf of Charles Karney via pdal <pdal at lists.osgeo.org>
> Date: Monday, June 3, 2024 at 10:50 AM
> To: pdal at lists.osgeo.org <pdal at lists.osgeo.org>
> Cc: Charles Karney <charles.karney at gmail.com>
> Subject: Re: [pdal] Trouble compiling PDAL with MATLAB Plugin on Mac OS
> 
> Note well that the error is occurring in find_library(Matlab REQUIRED)
> before it gets to find_package.  (But I don't know why find_library
> is needed in addition to find_package.)
> 
> On 6/3/24 10:34, Howard Butler via pdal wrote:
> > I also no longer have access to Matlab but I remember the Find logic 
> > being extra finicky on MacOS with the frameworks and weird OSXisms that 
> > are possible. It might also be worth it to track down a more recent 
> > FindMatlab.cmake file out there.
> > 
> >> On Jun 3, 2024, at 8:48 AM, Andrew Bell via pdal
> >> <pdal at lists.osgeo.org> wrote:
> >>
> >> I have no access to Matlab and I don't know who does at this point.
> >>
> >> Looking at the FindMatlab file, you might try just setting 
> >> Matlab_ROOT_DIR and lose the defines for the specific libraries. :shrug:
> >>
> >> On Mon, Jun 3, 2024 at 9:41 AM Patrick Rennich via pdal
> >> <pdal at lists.osgeo.org <mailto:pdal at lists.osgeo.org>> wrote:
> >>
> >>     Hello,____
> >>
> >>     ____
> >>
> >>     I’m having trouble compiling PDAL from source on Mac OS when
> >>     turning on the BUILD_MATLAB_PLUGIN=ON. PDAL compiles fine without
> >>     this, but when I execute cmake as follows:____
> >>
> >>     ____
> >>
> >>     cmake -G Ninja -DBUILD_PLUGIN_MATLAB=ON
> >>     -DMatlab_MX_LIBRARY=/Applications/MATLAB_R2024a.app/bin/maca64
> >>     -DMatlab_MAT_LIBRARY=/Applications/MATLAB_R2024a.app/bin/maca64
> >>     -DMatlab_ENG_LIBRARY=/Applications/MATLAB_R2024a.app/bin/maca64
> >>     -DMatlab_INCLUDE_DIRS=/Applications/MATLAB_R2024a.app/extern/include ..____
> >>
> >>     ____
> >>
> >>     I get the following error message:____
> >>
> >>     ____
> >>
> >>     CMake Error at cmake/matlab.cmake:4 (find_library):____
> >>
> >>       Could not find Matlab using the following names:____
> >>
> >>     Call Stack (most recent call first):____
> >>
> >>       plugins/matlab/CMakeLists.txt:3 (include)____
> >>
> >>     ____
> >>
> >>     Let me know if there’s any other info I can provide, and any help
> >>     is much appreciated. Thanks.____
> >>
> >>     __ __
> >>
> >>     __ __
> >>
> >>     Patrick
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