Is clBuildProgram needed in conjunction with clCreateProgramFromBinary?

Hi,

While trying to develop a standalone for a prior question, I noticed that offline compilation seems to behave differently for CPU and GPU. Per the OpenCL spec, my understanding is that I should be able to reuse compiled kernels (either through ioc32/64 or clCreateProgramFromSource/clBuild). When using a GPU device I can load said precompiled kernel through clCreateProgramFromBinary and be ready to use it. CPU, however, requires me to call clBuild yet again, which from a performance standpoint defeats the purpose of precompiling my kernels.

I've attached a MSVC 2012 project to reproduce what I'm seeing. Under the release directory are some precompiled kernels that I generated using ioc32. The executable explains how to use it upon running it with no commands. The only thing it doesn't mention is it checks the extension to determine if the input file is a binary file or not. If the file doesn't end in .bin, it assumes its a text .cl file.

Summary:

offlineCompileBug.exe CPU Template.cl 0 - Fails (Expected)
offlineCompileBug.exe CPU Template.cl 1 - Succeeds (Expected)
offlineCompileBug.exe GPU Template.gpu.bin 0 - Succeeds (Expected)
offlineCompileBug.exe GPU Template.gpu.bin 1 - Succeeds (Not expected, why does compiling twice work?)
offlineCompileBug.exe CPU Template.cpu.bin 0 - Fails (Unexpected, and I believe is a problem)
offlineCompileBug.exe CPU Template.cpu.bin 1 - Succeeds (Not expected, why does compiling twice work?)

Thanks!