-1001 means CL_PLATFORM_NOT_FOUND_KHR. So, it seems that the ICD loader is unable to find any platform on your setup. Actually, on Linux, the ICD loader scans the files in the path /etc/OpenCL/vendors to find vendor specific ICDs and libraries. For example, if the following file exists /etc/OpenCL/vendors/VendorA.icd and contains the text libVendorAOpenCL.so then the ICD Loader will load the library "libVendorAOpenCL.so". So, please make sure vendor specific ICDs are there and those are pointing to right library paths. [ For more details, please check cl_khr_icd ]
It may be an installation issue. So, I would suggest to install one SDK at a time and check whether everything is working fine. Then install another one and check the overall setup.
P.S. AMD APP SDK can be used to access the Intel CPUs as well.