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Thanks for your answer!
Unfortunately when I set one of these environment variables as you said, my AMD-APP-SDK-v2.5 can see just one device: CPU. That's all.
./CLInfo
Number of platforms: 1
Platform Profile: FULL_PROFILE
Platform Version: OpenCL 1.1 AMD-APP-SDK-v2.5 (684.213)
Platform Name: AMD Accelerated Parallel Processing
Platform Vendor: Advanced Micro Devices, Inc.
Platform Extensions: cl_khr_icd cl_amd_event_callback cl_amd_offline_devices
Platform Name: AMD Accelerated Parallel Processing
Number of devices: 1
Device Type: CL_DEVICE_TYPE_CPU
.........
//================================
So I have to roll back to the 11.6 version of driver. It works fine.