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I was able to build a mostly-complete .qch for OpenCV 3.1.0 as follows...

Main Build

cd PATH_TO/opencv-3.1.0
mkdir build; cd build
cmake -D CMAKE_INSTALL_PREFIX=/opt/opencv/3.1.0-qt5-gl \
      -D WITH_QT=5 \
      -D WITH_OPENGL=ON \
      -D WITH_OPENCL=OFF \
      -D BUILD_DOCS=ON \
      -D CMAKE_DOXYGEN_GENERATE_QHP=ON \
      -D CMAKE_BUILD_TYPE=RELEASE  ..
make -j7

Documents Build

cd doc  # goto PATH_TO/opencv-3.1.0/build/doc
make help
    The following are some of the valid targets for this Makefile:
   [...snip...]
    ... doxygen
    ... test
    ... package_source
    ... install/local

make -j7 doxygen

cd doc/doxygen/html
qhelpgenerator index.qhp -o opencv-3.1.0.qch

NOTE: In my case, there was a unmatched, dangling </section> tag at line 37157. If needed, comment out this line and rerun qhelpgenerator.

Q1. Which version of OpenCL is supported by OpenCV 3.1.0?

My guess is OpenCL 1.2 based on the set(OPENCL_INCLUDE_DIR "${OpenCV_SOURCE_DIR}/3rdparty/include/opencl/1.2") statement in the file opencv-3.1.0/cmake/OpenCVDetectOpenCL.cmake.

Also, the cl.h OpenCL include path is opencv-3.1.0/3rdparty/include/opencl/1.2/CL

Q2. If OpenCL 1.2 is a supported version, would the following build errors be a bug to report? or some other action to resolve?

opencv-3.1.0/modules/core/src/opengl.cpp:1644:9: error: use of undeclared identifier
   'clGetGLContextInfoKHR_fn'; did you mean 'clGetContextInfo'?
    clGetGLContextInfoKHR_fn clGetGLContextInfoKHR = (clGetGLContextInfoKHR_fn)
    ^~~~~~~~~~~~~~~~~~~~~~~~
    clGetContextInfo

opencv-3.1.0/modules/core/src/opengl.cpp:1646:14: error: use of undeclared identifier
  'clGetGLContextInfoKHR'; did you mean 'clGetContextInfo'?
    if (!clGetGLContextInfoKHR)
         ^~~~~~~~~~~~~~~~~~~~~
         clGetContextInfo

opencv-3.1.0/modules/core/src/opengl.cpp:1669:52: error: use of undeclared identifier
  'CL_CURRENT_DEVICE_FOR_GL_CONTEXT_KHR'
    status = clGetGLContextInfoKHR(properties, CL_CURRENT_DEVICE_FOR_GL_CONTEXT_KHR, ...
                                               ^

opencv-3.1.0/modules/core/src/opengl.cpp uses the symbols clGetGLContextInfoKHR, clGetGLContextInfoKHR_fn, CL_CURRENT_DEVICE_FOR_GL_CONTEXT_KHR

However, /System/Library/Frameworks/OpenCL.framework/Headers/cl.h does not contain those particular 3 symbols.

BUILD FAILS WITH_OPENCL

cmake -D CMAKE_INSTALL_PREFIX=/opt/opencv/3.1.0_test \
  -D WITH_QT=5 \
  -D WITH_OPENGL=ON \
  -D WITH_OPENCL=ON \
  -D CMAKE_BUILD_TYPE=RELEASE  ..

BUILD OTHERWISE SUCCEEDS WITHOUT OPENCL

cmake -D CMAKE_INSTALL_PREFIX=/opt/opencv/3.1.0_test \
  -D WITH_QT=5 \
  -D WITH_OPENGL=ON \
  -D WITH_OPENCL=OFF \
  -D CMAKE_BUILD_TYPE=RELEASE  ..

PLATFORM: OS X 10.10.5, Qt 5.5.1, OpenCL 1.2 (/System/Library/Frameworks/OpenCL.framework/Headers/cl.h)

Device Intel Core i7-4960HQ CPU @ 2.60GHz supports OpenCL 1.2
Device Iris Pro supports OpenCL 1.2 
Device GeForce GT 750M supports OpenCL 1.2