device selection too restrictive

[Ondřej Hošek]

Greetings,

first off, thanks for starting this project and getting it this far -- I'm glad I can develop and debug OpenCL-enabled applications on Linux-based systems without specialized hardware.

However, I have noticed that pocl is sometimes a bit too restrictive with regard to device selection in the API. For example, in clCreateContextFromType, where device_type is theoretically a bitmask, it checks for equality on each of the devices; and in clGetDeviceIDs, it doesn't store a single value in the devices array (and returns an error instead) if the array isn't large enough. (The expected behavior would be to fill the array as far as possible, i.e. to min(num, num_entries).)

The attached patch fixes the behavior in both cases.

[Pekka Jääskeläinen (pekka-jaaskelainen)]

Committed as r128. Thanks for patch, keep them coming! :)