[PROJ] cmake find_package() fails to find PROJ6 installed with MacPorts

[Tom O'Reilly]

Hi Mike et al,

I've installed proj6, proj8, and proj9 with MacPorts, into directories /opt/local/lib/proj6, /opt/local/lib/proj8, and /opt/local/lib/proj9. 

I wrote a minimal CMakeLists.txt file to test find_package(PROJ), and verify that;
find_package(PROJ CONFIG) works for proj9, but not for proj8 or proj6. 
So this is more-or-less consistent with what you guys say - thank you!

Here's the CMakeLists.txt:

#[[
Test capability of find_package(PROJ) to find various 
MacPort-installed proj versions
]]

cmake_minimum_required(VERSION 3.18)
project(cmake-test)

if (APPLE)
  # Assume MacPorts default install location in /opt/local
  set(CMAKE_INCLUDE_PATH ${CMAKE_INCLUDE_PATH} /opt/local/include)
  set(CMAKE_LIBRARY_PATH ${CMAKE_LIBRARY_PATH} /opt/local/lib)

  # Must set PROJ_ROOT to point at directory containing proj-versionX
  # so that find_package() works
  # MacPorts puts projX files in /opt/local/lib/projX
  set(PROJ_ROOT /opt/local/lib)

endif(APPLE)

message("find_package(PROJ)")
find_package(PROJ CONFIG REQUIRED)
message("done with find_package(PROJ)")
message("PROJ_LIBRARIES: ${PROJ_LIBRARIES}, PROJ_VERSION: ${PROJ_VERSION}")
message("DONE")


The proj*config.cmake file needed to support find_package(PROJ CONFIG) are only found under proj9:

find /opt/local/lib -iname 'proj*config.cmake'
/opt/local/lib/proj9/lib/cmake/proj4/proj4-config.cmake
/opt/local/lib/proj9/lib/cmake/proj/proj-config.cmake

Thanks!
Tom

--------------------------------------------------
Thomas C. O'Reilly
Monterey Bay Aquarium Research Institute
7700 Sandholdt Road
Moss Landing, California 95039-9644
831-775-1766 (voice)
831-775-1620 (FAX)
oreilly at mbari.org (email)
http://www.mbari.org (World-wide Web)
 
"The machine does not isolate us from the great mysteries
 of nature, but plunges us more deeply into them."
 
   - ANTOINE DE SAINT-EXUPERY
     "Wind, Sand, and Stars" (1939)

----- Original Message -----
From: "Mike Taves" <mwtoews at gmail.com>
To: "Tom O'Reilly" <oreilly at mbari.org>
Cc: "Even Rouault" <even.rouault at spatialys.com>, "proj" <proj at lists.osgeo.org>
Sent: Wednesday, June 1, 2022 2:34:41 PM
Subject: Re: [PROJ] cmake find_package() fails to find PROJ6 installed with MacPorts

On Thu, 2 Jun 2022 at 07:55, Tom O'Reilly <oreilly at mbari.org> wrote:
>
> My project needs proj6, but as a test of cmake I installed proj9 with MacPorts - and find_package(Proj9 CONFIG REQUIRED) fails just as before.
> Question - if the installed proj9 provides CONFIG support, I presume there is a proj9-config.cmake or Proj9Config.cmake file somewhere. Where would I look for this file? I see /opt/local/lib/proj9 - but the file is not in there. Would this file be in there if proj9 supports CONFIG mode or is there some other place to look?

Use the following:

find_package(PROJ CONFIG REQUIRED)

target_link_libraries(MyApp PRIVATE PROJ::proj)

See https://proj.org/development/cmake.html for more