0d4204e87f
When an OpenCL platform has no devices (of the requested type), calls to clGetDeviceIDs() are required to return with the error value CL_DEVICE_NOT_FOUND. Some platforms (e.g. Clover as of Mesa 10.4.2) do not touch their output parameters in such cases, which means that in some conditions the `num` variable where the number of devices of the platform should be stored may be used uninitialized. This can lead to segmentations faults in the subsequent calls to clGetDeviceInfo(). Simply reinitializing num to 0 is sufficient to prevent the segfault in the case of Mesa, but proper error handling is included for completeness. Change-Id: Ia25192f6aa953838a545a9e7c9fca050d2703b60 Reviewed-on: https://gerrit.libreoffice.org/14700 Tested-by: Jenkins <ci@libreoffice.org> Reviewed-by: Tor Lillqvist <tml@collabora.com>
OpenCL-related code that is not specific to any particular functionality OpenCL is used for. (Like formula group calculation in Calc.) Not compiled on platforms where OpenCL is not available (iOS and Android). On other platforms OpenCL is optional at run-time, but not at build time.