ERROR: Unable to find Intel(R) FPGA OpenCL platform during emulation

Description

When customer runs emulation on Intel® FPGA OpenCL™ hello_world example(Or other examples in hld folder), it may reports "ERROR:Unable to find Intel(R) FPGA OpenCL platform" as follows:

$ env CL_CONTEXT_EMULATOR_DEVICE_INTELFPGA=1 ./host

ERROR: Unable to find Intel(R) FPGA OpenCL platform.

Resolution

This error is due to fact that the Intel® FPGA OpenCL™ emulation process changed beginning from version 19.2.  Please refer to the example readme file and source code for details.

To workaround this issue, you should use the command "./host -emulator" to run emulation from version 19.2 of the Intel® FPGA SDK for OpenCL™.