Added custom OpenCV mex compiler

modules/matlab/compile.cmake

@@ -1,7 +1,12 @@
+# LISTIFY
+# Given a string of space-delimited tokens, reparse as a string of
+# semi-colon delimited tokens, which in CMake land is exactly equivalent
+# to a list
 macro(listify OUT_LIST IN_STRING)
     string(REPLACE " " ";" ${OUT_LIST} ${IN_STRING})
 endmacro()
 
+# listify multiple-argument inputs
 listify(MEX_INCLUDE_DIRS_LIST ${MEX_INCLUDE_DIRS})
 if (${CONFIGURATION} MATCHES "Debug")
     listify(MEX_LIBS_LIST ${MEX_DEBUG_LIBS})
@@ -9,11 +14,22 @@ else()
     listify(MEX_LIBS_LIST ${MEX_LIBS})
 endif()
 
+# if it's MSVC building a Debug configuration, don't build bindings
+if ("${CONFIGURATION}" MATCHES "Debug")
+    message(STATUS "Matlab bindings are only available in Release configurations. Skipping...")
+    return()
+endif()
+
+# for each generated source file:
+# 1. check if the file has already been compiled
+# 2. attempt compile if required
+# 3. if the compile fails, throw an error and cancel compilation
 file(GLOB SOURCE_FILES "${CMAKE_CURRENT_BINARY_DIR}/src/*.cpp")
 foreach(SOURCE_FILE ${SOURCE_FILES})
     # strip out the filename
     get_filename_component(FILENAME ${SOURCE_FILE} NAME_WE)
-    # compie the source file using mex
+    # compile the source file using mex
+    execute_process(COMMAND echo ${FILENAME})
     if (NOT EXISTS ${CMAKE_CURRENT_BINARY_DIR}/+cv/${FILENAME}.${MATLAB_MEXEXT})
         execute_process(
             COMMAND ${MATLAB_MEX_SCRIPT} ${MEX_OPTS} "CXXFLAGS=\$CXXFLAGS ${MEX_CXXFLAGS}" ${MEX_INCLUDE_DIRS_LIST}