Question

我正在使用OpenCl和Android。但是，似乎我遇到了一些链接问题。我在应用程序的jni文件夹下都有OpenCl库。我的Android.mk如下：

LOCAL_PATH := $(call my-dir)
LOCAL_PATH_EXT := $(call my-dir)/../external/
include $(CLEAR_VARS)

LOCAL_MODULE := InverseFilter

LOCAL_CFLAGS += -DANDROID_CL
LOCAL_CFLAGS += -O3 -ffast-math

LOCAL_C_INCLUDES := $(LOCAL_PATH)/../include

LOCAL_SRC_FILES := device_test.c
#LOCAL_LDFLAGS += -ljnigraphics
LOCAL_LDLIBS := -llog -ljnigraphics
LOCAL_LDLIBS += $(LOCAL_PATH)/../external/libPVROCL.so
LOCAL_ARM_MODE := arm

include $(BUILD_SHARED_LIBRARY)

从我编写的C文件构建项目时出现以下错误：

Error:(21) undefined reference to `clGetDeviceIDs'

这只是我遇到的错误之一。所有这些都与cl有关。如果您需要任何其他信息，请与我们联系。

我的设备C代码如下：

#include "device_test.h"
#include "cl.h"
#include <stdio.h>
#include <string.h>


JNIEXPORT jint JNICALL
Java_ras_asu_com_opencl_2_MainActivity_updatebuffer (JNIEnv *env, jobject obj, jobject buffer) {

cl_platform_id platform;
cl_device_id device;
char name_data[48], vendor[64], version[64], ext_data[512];
unsigned int image_support = 0, max_frequency = 0, work_group_size = 0;
unsigned int max_compute_units = 0, max_image_height = 0, max_image_width = 0;
unsigned long max_global_size = 0, max_local_size = 0;
jint ret = 0, pos = 0;

void *buff = (*env)->GetDirectBufferAddress(env, buffer);
clGetPlatformIDs(1, &platform, NULL);
clGetDeviceIDs(platform, CL_DEVICE_TYPE_ALL, 1, &device, NULL);

// Read device name
clGetDeviceInfo(device, CL_DEVICE_NAME, sizeof(name_data), name_data, &ret);
memcpy(buff, name_data, ret);
pos = ret;
sprintf(buff + pos++, ",");

// Read device vendor
clGetDeviceInfo(device, CL_DEVICE_VENDOR, sizeof(vendor), vendor, &ret);
memcpy(buff + pos, vendor, ret);
pos += ret;
sprintf(buff + pos++, ",");

// Read supported version
clGetDeviceInfo(device, CL_DEVICE_VERSION, sizeof(version), version, &ret);
memcpy(buff + pos, version, ret);
pos += ret;
sprintf(buff + pos++, ",");

// Find maximum frequency
clGetDeviceInfo(device, CL_DEVICE_MAX_CLOCK_FREQUENCY, sizeof(max_frequency), &max_frequency, NULL);
pos += sprintf(buff + pos, "%u MHz,", max_frequency);

// Find the maximum number of compute units
clGetDeviceInfo(device, CL_DEVICE_MAX_COMPUTE_UNITS, sizeof(max_compute_units), &max_compute_units, NULL);
pos += sprintf(buff + pos, "%u,", max_compute_units);

// Find the maximum work-group size
clGetDeviceInfo(device, CL_DEVICE_MAX_WORK_GROUP_SIZE, sizeof(work_group_size), &work_group_size, NULL);
pos += sprintf(buff + pos, "%u work-items per group,", work_group_size);

// Find the maximum size of global memory
clGetDeviceInfo(device, CL_DEVICE_GLOBAL_MEM_SIZE, sizeof(max_global_size), &max_global_size, NULL);
pos += sprintf(buff + pos, "%lu bytes,", max_global_size);

// Find the maximum size of global memory
clGetDeviceInfo(device, CL_DEVICE_LOCAL_MEM_SIZE, sizeof(max_local_size), &max_local_size, NULL);
pos += sprintf(buff + pos, "%lu bytes,", max_local_size);

// Find out if device supports images
clGetDeviceInfo(device, CL_DEVICE_IMAGE_SUPPORT, sizeof(image_support), &image_support, NULL);
pos += sprintf(buff + pos, (image_support)? "true," : "false,");

// Find maximum image width
clGetDeviceInfo(device, CL_DEVICE_IMAGE2D_MAX_WIDTH, sizeof(max_image_width), &max_image_width, NULL);
pos += sprintf(buff + pos, "%u pixels,", max_image_width);

// Find maximum image height
clGetDeviceInfo(device, CL_DEVICE_IMAGE2D_MAX_HEIGHT, sizeof(max_image_height), &max_image_height, NULL);
pos += sprintf(buff + pos, "%u pixels,", max_image_height);

// Read device extensions
clGetDeviceInfo(device, CL_DEVICE_EXTENSIONS, sizeof(ext_data), ext_data, &ret);
memcpy(buff + pos, ext_data, ret);
pos += ret;
sprintf(buff + pos++, ",");

return pos;
}

Android：错误：（20）未定义对`clGetPlatformIDs'的引用

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