printing the platform information in OpenCL following this SO post https://stackoverflow.com/a/50667352/4999991

CMakeLists.txt

cmake_minimum_required(VERSION 3.1)

project(OpenCL_Example)

find_package(OpenCL REQUIRED)
include_directories(${OpenCL_INCLUDE_DIRS})
link_directories(${OpenCL_LIBRARY})

add_executable(main main.c)
target_include_directories(main PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
target_link_libraries(main ${OpenCL_LIBRARY})

main.c

#include <stdio.h> //printf

#ifdef __APPLE__
#include <OpenCL/cl.h>
#else
#include <CL/cl.h>
#endif

int main(int argc, char const* argv[]) {
  cl_int err;
  cl_uint numPlatforms;
  cl_platform_id* platforms;

  err = clGetPlatformIDs(0, NULL, &numPlatforms);
  if(err != CL_SUCCESS || numPlatforms == 0) {
     printf("Couldn't identify a platform");
     return EXIT_FAILURE;
  }
  printf("Number of platfroms: %d\n", numPlatforms);

  platforms= (cl_platform_id*) malloc(sizeof(cl_platform_id) * numPlatforms);
  err = clGetPlatformIDs(numPlatforms, platforms, NULL);
  if(err != CL_SUCCESS) {
     printf("Couldn't get platforms");
     return EXIT_FAILURE;
  }

  cl_platform_info Param_Name[5]={CL_PLATFORM_PROFILE, CL_PLATFORM_VERSION, CL_PLATFORM_NAME, CL_PLATFORM_VENDOR,CL_PLATFORM_EXTENSIONS};
  cl_platform_info param_name;
  size_t param_value_size;
  for(int i=0;i<numPlatforms;i++){
    for(int j=0;j<5;j++){
      param_name=Param_Name[j];
      err = clGetPlatformInfo( platforms[i], param_name, 0, NULL, &param_value_size);
      char* param_value = (char*)malloc( sizeof(char) * param_value_size);
      err = clGetPlatformInfo( platforms[i], param_name, param_value_size, param_value, NULL );
      printf("%s\n", param_value);
      free(param_value);
    }
  }

  free(platforms);
  return 0;
}

MakeFile

OS := $(shell uname)
OPTIONS:=

ifeq ($(OS),Darwin)
	OPTIONS += -framework OpenCL
else
	OPTIONS += -l OpenCL
endif

all: main.c
	gcc -Wall -g main.c -o main $(OPTIONS)

clean:
	rm -rf main

hi, many thanks for your code. By the way, stdlib.h should be included,

how to run this on linux