OTIO installs CMake files in unexpected location

[jfpanisset]

As per CMake documentation and examples from most other projects, the typical location for installing project CMake files is:

/usr/local/lib/cmake/<project_name>/

In OTIO 0.18.1, src/{opentime,opentimelineio}/CMakeLists.txt has:

    install(EXPORT OpenTimeTargets
            DESTINATION "${OTIO_RESOLVED_CXX_INSTALL_DIR}/share/opentime"
            NAMESPACE OTIO:: )

which lands the project .cmake files in:

# ls /usr/local/share/opentime/
OpenTimeConfig.cmake  OpenTimeTargets-noconfig.cmake  OpenTimeTargets-release.cmake  OpenTimeTargets.cmake
# ls /usr/local/share/opentimelineio/
OpenTimelineIOConfig.cmake  OpenTimelineIOTargets-noconfig.cmake  OpenTimelineIOTargets-release.cmake  OpenTimelineIOTargets.cmake

As per issue #2007 it can be argued that installation of C++ and Python components could be separated and thus we should use the guidance from the CMake documentation:

DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/opentime

and

DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/opentimelineio

to always install the CMake files in the expected location, but for now I'm suggesting the following patch which has the same result and installs the .cmake files in:

# ls /usr/local/lib/cmake/opentime
OpenTimeConfig.cmake  OpenTimeTargets-noconfig.cmake  OpenTimeTargets.cmake
# ls /usr/local/lib/cmake/opentimelineio
OpenTimelineIOConfig.cmake  OpenTimelineIOTargets-noconfig.cmake  OpenTimelineIOTargets.cmake

If this seems appropriate, I can submit this as a PR.

diff --git src/opentime/CMakeLists.txt src/opentime/CMakeLists.txt
index d99dd79ac..bfda2778a 100644
--- src/opentime/CMakeLists.txt
+++ src/opentime/CMakeLists.txt
@@ -73,7 +73,7 @@
             RUNTIME DESTINATION "${OTIO_RESOLVED_CXX_DYLIB_INSTALL_DIR}")

     install(EXPORT OpenTimeTargets
-            DESTINATION "${OTIO_RESOLVED_CXX_INSTALL_DIR}/share/opentime"
+            DESTINATION "${OTIO_RESOLVED_CXX_INSTALL_DIR}/lib/cmake/opentime"
             NAMESPACE OTIO:: )

     include(CMakePackageConfigHelpers)
@@ -81,7 +81,7 @@
         ${CMAKE_CURRENT_SOURCE_DIR}/OpenTimeConfig.cmake.in
         ${CMAKE_CURRENT_BINARY_DIR}/OpenTimeConfig.cmake
         INSTALL_DESTINATION
-            ${OTIO_RESOLVED_CXX_INSTALL_DIR}/share/opentime
+            ${OTIO_RESOLVED_CXX_INSTALL_DIR}/lib/cmake/opentime
         NO_SET_AND_CHECK_MACRO
         NO_CHECK_REQUIRED_COMPONENTS_MACRO
     )
@@ -90,7 +90,7 @@
         FILES
             ${CMAKE_CURRENT_BINARY_DIR}/OpenTimeConfig.cmake
         DESTINATION
-            ${OTIO_RESOLVED_CXX_INSTALL_DIR}/share/opentime
+            ${OTIO_RESOLVED_CXX_INSTALL_DIR}/lib/cmake/opentime
     )

     install(
diff --git src/opentimelineio/CMakeLists.txt src/opentimelineio/CMakeLists.txt
index d99dd79ac..bfda2778a 100644
--- src/opentimelineio/CMakeLists.txt
+++ src/opentimelineio/CMakeLists.txt
@@ -151,7 +151,7 @@
            RUNTIME DESTINATION "${OTIO_RESOLVED_CXX_DYLIB_INSTALL_DIR}")

     install(EXPORT OpenTimelineIOTargets
-           DESTINATION "${OTIO_RESOLVED_CXX_INSTALL_DIR}/share/opentimelineio"
+           DESTINATION "${OTIO_RESOLVED_CXX_INSTALL_DIR}/lib/cmake/opentimelineio"
            NAMESPACE OTIO:: )

     include(CMakePackageConfigHelpers)
@@ -159,7 +159,7 @@
         ${CMAKE_CURRENT_SOURCE_DIR}/OpenTimelineIOConfig.cmake.in
         ${CMAKE_CURRENT_BINARY_DIR}/OpenTimelineIOConfig.cmake
         INSTALL_DESTINATION
-            ${OTIO_RESOLVED_CXX_INSTALL_DIR}/share/opentimelineio
+            ${OTIO_RESOLVED_CXX_INSTALL_DIR}/lib/cmake/opentimelineio
         NO_SET_AND_CHECK_MACRO
         NO_CHECK_REQUIRED_COMPONENTS_MACRO
     )
@@ -168,7 +168,7 @@
         FILES
             ${CMAKE_CURRENT_BINARY_DIR}/OpenTimelineIOConfig.cmake
         DESTINATION
-            ${OTIO_RESOLVED_CXX_INSTALL_DIR}/share/opentimelineio
+            ${OTIO_RESOLVED_CXX_INSTALL_DIR}/lib/cmake/opentimelineio
     )

     install(

[darbyjohnston]

I'm not sure why 'share' was chosen, that may have been an oversight. It does seem like it would be better to follow CMake convention, I think a PR to change it would be welcome.