Compiler error about argument descriptors

[Andreas Klöckner]

Python 2.7.3rc2 (default, Apr 22 2012, 22:30:17)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pyopencl as cl
>>> import pyopencl.array
>>> import numpy as np
>>> ctx = cl.create_some_context(answers=["portable"])
>>> q = cl.CommandQueue(ctx)
>>> cl.array.arange(q, 27, dtype=np.complex64)
/home/andreas/research/software/pyopencl/pyopencl/array.py:964: ComplexWarning: Casting complex values to real discards the imaginary part
  size = int(ceil((stop-start)/step))
<stdin>:3:22: error: use of undeclared identifier '_arange_NUM_ARGS'
unsigned _num_args = _arange_NUM_ARGS;
                     ^
<stdin>:4:25: error: use of undeclared identifier '_arange_ARG_IS_POINTER'
int _arg_is_pointer[] = _arange_ARG_IS_POINTER;
                        ^
<stdin>:5:23: error: use of undeclared identifier '_arange_ARG_IS_LOCAL'
int _arg_is_local[] = _arange_ARG_IS_LOCAL;
                      ^
<stdin>:6:23: error: use of undeclared identifier '_arange_ARG_IS_IMAGE'
int _arg_is_image[] = _arange_ARG_IS_IMAGE;
                      ^
<stdin>:7:25: error: use of undeclared identifier '_arange_ARG_IS_SAMPLER'
int _arg_is_sampler[] = _arange_ARG_IS_SAMPLER;
                        ^
<stdin>:8:24: error: use of undeclared identifier '_arange_NUM_LOCALS'
unsigned _num_locals = _arange_NUM_LOCALS;
                       ^
6 errors generated.
ld: cannot find /tmp/poclvnENH1/pthread/arange/descriptor.so.o: No such file or directory
The kernel descriptor.so is not found.
(abort)

[Pekka Jääskeläinen (pekka-jaaskelainen)]

Looking at the program.cl under pocl temp (/tmp/poclvnENH1 in your case) it reveals a suspicious line #include <pyopencl-complex.h>. Includes are not supported in pocl (clBuildProgram options are not passed to the compiler). Should be an easy add.

Another problem is the use of a non-pointer struct arguments which do not work and are harder to fix (requires Clang patches or parsing the kernels at pocl): https://bugs.launchpad.net/pocl/+bug/987905

The program.cl:

//CL//
        #include <pyopencl-complex.h>

        __kernel void arange(__global cfloat_t *z, cfloat_t start, cfloat_t step, long n)
        {
          int lid = get_local_id(0);
          int gsize = get_global_size(0);
          int work_item_start = get_local_size(0)*get_group_id(0);
          long i;

          ;
          //CL//
          for (i = work_item_start + lid; i < n; i += gsize)
          {
            z[i] = start + i*step;
          }

          ;
        }

__constant int pyopencl_defeat_cache_571a99d551bd4f38a1c2c236ceb163e9 = 0;

[Pekka Jääskeläinen (pekka-jaaskelainen)]

Options are not passed to the compiler so the include part should be fixed. Structs as value args are not fixed.

[Pekka Jääskeläinen (pekka-jaaskelainen)]

Closing this as there's a separate bug about the by-value struct kernel args: https://bugs.launchpad.net/pocl/+bug/987905