Support XIB compiling for non-Xcode projects

cmake/PlasmaTargets.cmake

@@ -65,6 +65,31 @@ function(plasma_executable TARGET)
         plasma_sanitize_target(${TARGET})
     endif()
 
+    # Xcode will automatically run ibtool to compile the XIB files into NIB
+    # resources, but if we're generating Makefiles or Ninja projects then we
+    # need to handle that ourselves...
+    if (_pex_CLIENT AND NOT CMAKE_GENERATOR STREQUAL "Xcode")
+        find_program(IBTOOL ibtool HINTS "/usr/bin" "${OSX_DEVELOPER_ROOT}/usr/bin")
+        if (NOT IBTOOL)
+            message(SEND_ERROR "Could not find Xcode's ibtool to process .xib files")
+        endif()
+
+        foreach(SRCFILE IN LISTS _pex_SOURCES)
+            get_filename_component(SRCEXTENSION ${SRCFILE} LAST_EXT)
+            if (NOT ${SRCEXTENSION} STREQUAL ".xib")
+                continue()
+            endif()
+
+            get_filename_component(XIBFILENAME ${SRCFILE} NAME_WE)
+            add_custom_command(TARGET ${TARGET} POST_BUILD
+                COMMAND ${IBTOOL} --output-format human-readable-text --compile "$<TARGET_BUNDLE_CONTENT_DIR:${TARGET}>/Resources/${XIBFILENAME}.nib" "${CMAKE_CURRENT_SOURCE_DIR}/${SRCFILE}"
+                COMMENT "Compiling ${SRCFILE} to ${XIBFILENAME}.nib"
+                VERBATIM
+            )
+            set_source_files_properties(${SRCFILE} PROPERTIES HEADER_FILE_ONLY ON)
+        endforeach()
+    endif()
+
     if(DEFINED install_destination)
         install(TARGETS ${TARGET} DESTINATION ${install_destination})
         if(_pex_INSTALL_PDB AND WIN32 AND NOT MINGW)