[MacPorts] #48288: CMake generating broken Xcode projects when using OpenCV

[MacPorts]

#48288: CMake generating broken Xcode projects when using OpenCV
----------------------------------+--------------------------------
 Reporter:  christian.richardt@…  |      Owner:  macports-tickets@…
     Type:  defect                |     Status:  new
 Priority:  Normal                |  Milestone:
Component:  ports                 |    Version:  2.3.3
 Keywords:                        |       Port:  opencv
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 I use OpenCV in projects for which I create Xcode projects using CMake. I
 found some issues in OpenCV configuration files that cause CMake to create
 invalid Xcode projects (error: "Project … cannot be opened because the
 project file cannot be parsed.")

 I'm using
 * opencv @3.0.0_0+eigen+opencl+openni+python27+qt4+tbb+vtk
 * cmake @3.2.3_0+docs+gui+python27+qt4

 I think that one or more of these OpenCV variants might trigger this bug,
 but it could also be a bug in OpenCV rather than its MacPort. However, as
 I've not found anyone else complaining about it online, I assume it's a
 MacPort-specific issue.

 Essentially, the string "/ /System/Library/Frameworks" (two leading
 slashes without space) somehow ends up in
 /opt/local/lib/pkgconfig/opencv.pc:
 {{{
 [...]
 Libs.private: -l-framework OpenCL -L/opt/local/lib [...] -ltbb -ltbbmalloc
 -L//System/Library/Frameworks -lAGL -lOpenGL
 [...]
 }}}
 and in /opt/local/share/OpenCV/OpenCVModules-release.cmake:
 {{{
 [...]
 set_target_properties(opencv_hal PROPERTIES
   IMPORTED_LINK_INTERFACE_LANGUAGES_RELEASE "CXX"
   IMPORTED_LINK_INTERFACE_LIBRARIES_RELEASE "-ltbb
 -ltbbmalloc;//System/Library/Frameworks/AGL.framework;//System/Library/Frameworks/OpenGL.framework"
   IMPORTED_LOCATION_RELEASE "${_IMPORT_PREFIX}/lib/libopencv_hal.a"
   )
 [...]
 set_target_properties(opencv_ts PROPERTIES
   IMPORTED_LINK_INTERFACE_LANGUAGES_RELEASE "CXX"
   IMPORTED_LINK_INTERFACE_LIBRARIES_RELEASE
 "opencv_hal;opencv_core;opencv_imgproc;opencv_imgcodecs;opencv_videoio;opencv_highgui;-ltbb
 -ltbbmalloc;//System/Library/Frameworks/AGL.framework;//System/Library/Frameworks/OpenGL.framework"
   IMPORTED_LOCATION_RELEASE "${_IMPORT_PREFIX}/lib/libopencv_ts.a"
   )
 [...]
 }}}

 In a CMake project that uses OpenCV, any Xcode project created for it will
 contain the following line in "Project.xcodeproj/project.pbxproj":
 {{{
 FRAMEWORK_SEARCH_PATHS = (//System/Library/Frameworks, );
 }}}
 which prevents Xcode from opening the generated project as it cannot be
 parsed.

 Removing the "FRAMEWORK_SEARCH_PATHS" lines manually from
 "project.pbxproj" fixes the parsing error and the Xcode project can be
 opened as expected.

 Replacing the double leading slash in the two files mentioned above with a
 single slash, and re-running CMake, prevents the FRAMEWORK_SEARCH_PATHS
 lines from appearing in the first place, and Xcode projects work fine.

 This leads me to believe that the double slash should be replaced with a
 single slash, when /opt/local/lib/pkgconfig/opencv.pc and
 /opt/local/share/OpenCV/OpenCVModules-release.cmake are generated.

-- 
Ticket URL: <https://trac.macports.org/ticket/48288>
MacPorts <https://www.macports.org/>
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