Implement KHR ICD extension

This adds a pointer to the dispatch table at the beginning of every object
of type

 - cl_command_queue
 - cl_context
 - cl_device_id
 - cl_event
 - cl_kernel
 - cl_mem
 - cl_platform_id
 - cl_program
 - cl_sampler

as required by the ICD specification. The layout of the dispatch table
comes from the OpenCL ICD loader by Brice Videau <brice.videau@imag.fr> and
Vincent Danjean <Vincent.Danjean@ens-lyon.org>.

To avoid dispatch table entries being overwritten with the ICD loader's
implementations of the CL functions (as would be the proper behaviour for
the ELF loader), the -Bsymbolic option is given to the linker.

Signed-off-by: Zhigang Gong <zhigang.gong@linux.intel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/cl_sampler.c b/src/cl_sampler.c
index fd88a772..d3e61da6 100644
--- a/src/cl_sampler.c
+++ b/src/cl_sampler.c
@@ -21,6 +21,7 @@
 #include "cl_sampler.h"
 #include "cl_utils.h"
 #include "cl_alloc.h"
+#include "cl_khr_icd.h"
 
 #include <assert.h>
 
@@ -36,6 +37,7 @@ cl_sampler_new(cl_context ctx,
 
   /* Allocate and inialize the structure itself */
   TRY_ALLOC (sampler, CALLOC(struct _cl_sampler));
+  SET_ICD(sampler->dispatch)
   sampler->ref_n = 1;
   sampler->magic = CL_MAGIC_SAMPLER_HEADER;
   sampler->normalized_coords = normalized_coords;