Build error when using pipe related functions in openCL code -

i writing use pipe feature of opencl 2.0. have kernel filters input , writes pipe. issue when use pipe related functions error "function declared implicitly". when checked online found error usualy appears in c code if function not declared before used. opencl library function.

my kernel code is:

__kernel void filter1_kernel(__global int *input, const unsigned int rlen, const unsigned int lower, const unsigned int upper, __global int *pipe1){

unsigned int bitmap = 0; int count = 0; //reserve_id_t rid;  uint numworkitems = get_global_size(0); uint tid          = get_global_id(0); uint num_packets = get_local_size(0);  while(tid < rlen){     if(input[tid] >= lower && input[tid] <= upper){         bitmap = bitmap | (1 << count);         printf((__constant char *)"\nfilter1 %u %u %d %u", tid, bitmap, input[tid], count);     }     tid += numworkitems;     count++; }  reserve_id_t rid = work_group_reserve_write_pipe(pipe1, num_packets); while(is_valid_reserve_id(rid) == false) {     rid = work_group_reserve_write_pipe(pipe1, num_packets); } //write pipe 

}

the errors got are:

build log buffer length : 1048 --- build log --- "c:\users\pdca\appdata\local\temp\oclfb5e.tmp.cl", line 40: error: function "work_group_reserve_write_pipe" declared implicitly reserve_id_t rid = work_group_reserve_write_pipe(pipe1, num_packets); ^

"c:\users\pdca\appdata\local\temp\oclfb5e.tmp.cl", line 40: warning: value of type "int" cannot used initialize entity of type "reserve_id_t" reserve_id_t rid = work_group_reserve_write_pipe(pipe1, num_packets); ^

"c:\users\pdca\appdata\local\temp\oclfb5e.tmp.cl", line 41: error: function "is_valid_reserve_id" declared implicitly while(is_valid_reserve_id(rid) == false) { ^

"c:\users\pdca\appdata\local\temp\oclfb5e.tmp.cl", line 42: warning: value of type "int" cannot assigned entity of type "reserve_id_t" rid = work_group_reserve_write_pipe(pipe1, num_packets); ^

2 errors detected in compilation of "c:\users\pdca\appdata\local\temp\oclfb5 e.tmp.cl". frontend phase failed compilation.

                            --- build log --- 

error: clbuildprogram (cl_build_program_failure)

from cl-specs (https://www.khronos.org/registry/cl/specs/opencl-2.0.pdf), page 203:

if cl-std build option not specified, highest opencl c 1.x language version supported each device used when compiling program each device. applications required specify –cl-std=cl2.0 option if want compile or build programs opencl c 2.0.

so if did not include option clbuildprogram() call, cl-compiler not recognize 2.0 language-features. thus, call should sth this:

clbuildprogram (program, num_devices, device_list, "–cl-std=cl2.0", null, null); 

in addition, think kernel-parameter not correct. cannot use __global int *pipe1 argument pipe functions. should declared __write_only pipe int pipe1.