NAME

       clLinkProgram - Links a set of compiled program objects and libraries for all the devices
       or a specific device(s) in the OpenCL context and creates an executable.

       cl_program clLinkProgram(cl_context context, cl_uint num_devices,
                                const cl_device_id *device_list, const char *options,
                                cl_uint num_input_programs, const cl_program *input_programs,
                                void (CL_CALLBACK *pfn_notify) (cl_program program, void *user_data),
                                void *user_data, cl_int *errcode_ret);

PARAMETERS

        context
           Must be a valid OpenCL context.

        device_list
           A pointer to a list of devices that are in context. If device_list is a NULL value,
           the link is performed for all devices associated with context for which a compiled
           object is available. If device_list is a non-NULL value, the compile is performed for
           devices specified in this list for which a source has been loaded.

        num_devices
           The number of devices listed in device_list.

        options
           A pointer to a null-terminated string of characters that describes the link options to
           be used for building the program executable. See clBuildProgram(3clc) for a list of
           supported compiler and linker options.

        num_input_programs
           Specifies the number of programs in array referenced by input_programs.

        input_programs
           An array of program objects that are compiled binaries or libraries that are to be
           linked to create the program executable. For each device in device_list or if
           device_list is NULL the list of devices associated with context, the following cases
           occur:

           •   All programs specified by input_programs contain a compiled binary or library for
               the device. In this case, a link is performed to generate a program executable for
               this device.

           •   None of the programs contain a compiled binary or library for that device. In this
               case, no link is performed and there will be no program executable generated for
               this device.

           •   All other cases will return a CL_INVALID_OPERATION error.

        pfn_notify
           A function pointer to a notification routine. The notification routine is a callback
           function that an application can register and which will be called when the program
           executable has been built (successfully or unsuccessfully).

           If pfn_notify is not NULL, clLinkProgram does not need to wait for the linker to
           complete and can return immediately once the linking operation can begin. Once the
           linker has completed, the pfn_notify callback function is called which returns the
           program object returned by clLinkProgram. The application can query the link status
           and log for this program object. This callback function may be called asynchronously
           by the OpenCL implementation. It is the application’s responsibility to ensure that
           the callback function is thread-safe.

           If pfn_notify is NULL, clLinkProgram does not return until the linker has completed.

        user_data
           Will be passed as an argument when pfn_notify is called.  user_data can be NULL.

NOTES

       clLinkProgram creates a new program object which contains this executable. The executable
       binary can be queried using clGetProgramInfo(3clc)(program, CL_PROGRAM_BINARIES, ...) and
       can be specified to clCreateProgramWithBinary(3clc) to create a new program object.

       The devices associated with the returned program object will be the list of devices
       specified by device_list or if device_list is NULL it will be the list of devices
       associated with context.

       The linking operation can begin if the context, list of devices, input programs and linker
       options specified are all valid and appropriate host and device resources needed to
       perform the link are available. If the linking operation can begin, clLinkProgram returns
       a valid non-zero program object.

ERRORS

       If pfn_notify is NULL, the errcode_ret will be set to CL_SUCCESS if the link operation was
       successful and CL_LINK_FAILURE if there is a failure to link the compiled binaries and/or
       libraries.

       If pfn_notify is not NULL, clLinkProgram does not have to wait until the linker to
       complete and can return CL_SUCCESS in errcode_ret if the linking operation can begin. The
       pfn_notify callback function will return a CL_SUCCESS or CL_LINK_FAILURE if the linking
       operation was successful or not.

       Otherwise clLinkProgram returns a NULL program object with an appropriate error in
       errcode_ret. The application should query the linker status of this program object to
       check if the link was successful or not. The list of errors that can be returned are:

       •   CL_INVALID_CONTEXT if context is not a valid context.

       •   CL_INVALID_VALUE if device_list is NULL and num_devices is greater than zero, or if
           device_list is not NULL and num_devices is zero.

       •   CL_INVALID_VALUE if num_input_programs is zero and input_programs is NULL or if
           num_input_programs is zero and input_programs is not NULL or if num_input_programs is
           not zero and input_programs is NULL.

       •   CL_INVALID_PROGRAM if programs specified in input_programs are not valid program
           objects.

       •   CL_INVALID_VALUE if pfn_notify is NULL but user_data is not NULL.

       •   CL_INVALID_DEVICE if OpenCL devices listed in device_list are not in the list of
           devices associated with context.

       •   CL_INVALID_LINKER_OPTIONS if the linker options specified by options are invalid

       •   CL_INVALID_OPERATION if the compilation or build of a program executable for any of
           the devices listed in device_list by a previous call to clCompileProgram(3clc) or
           clBuildProgram(3clc) for program has not completed.

       •   CL_INVALID_OPERATION if the rules for devices containing compiled binaries or
           libraries as described in input_programs argument above are not followed.

       •   CL_LINKER_NOT_AVAILABLE if a linker is not available i.e. CL_DEVICE_LINKER_AVAILABLE
           specified in the table of allowed values for param_name for clGetDeviceInfo(3clc) is
           set to CL_FALSE.

       •   CL_LINK_PROGRAM_FAILURE if there is a failure to link the compiled binaries and/or
           libraries.

       •   CL_OUT_OF_RESOURCES if there is a failure to allocate resources required by the OpenCL
           implementation on the device.

       •   CL_OUT_OF_HOST_MEMORY if there is a failure to allocate resources required by the
           OpenCL implementation on the host.

SPECIFICATION

       OpenCL Specification[1]

SEE ALSO

       clGetDeviceInfo(3clc)

AUTHORS

       The Khronos Group

COPYRIGHT

       Copyright © 2007-2011 The Khronos Group Inc.
       Permission is hereby granted, free of charge, to any person obtaining a copy of this
       software and/or associated documentation files (the "Materials"), to deal in the Materials
       without restriction, including without limitation the rights to use, copy, modify, merge,
       publish, distribute, sublicense, and/or sell copies of the Materials, and to permit
       persons to whom the Materials are furnished to do so, subject to the condition that this
       copyright notice and permission notice shall be included in all copies or substantial
       portions of the Materials.

NOTES

        1. OpenCL Specification
           page 142, section 5.6.3 - Separate Compilation and Linking of Programs