Compiler Flags
The following table lists the compiler flags in OpenCL and their closely related or equivalent flags in SYCL*:
| OpenCL | SYCL | Description |
|---|---|---|
| -c | -c | Compiles your kernel and generates the output of the parser without creating an FPGA programming image file. |
| -rtl | -fsycl-link=early | Instructs the compiler to stop after creating the FPGA early image and the associated optimization report. |
| -I=<directory> | -I=<directory> | Adds a directory to the list of directories that the compiler searches for header files during kernel compilation. |
| -o <file_name> | -o <file_name> | In OpenCL, specifies the name of the output .aocr or .aocx file. In SYCL, specifies the output executable name. |
| -board=<board_name>-board-package=<board_package_path> | -Xstarget=<BSP>:<fpga_board_variant> | In SYCL, it specifies the FPGA target and variant. If omitted, the compiler chooses the default FPGA target and variant, which are installation dependent. Refer to the FPGA BSPs and Boards section in the Intel oneAPI Programming Guide for additional details. |
| -high-effort | -Xsseed=<n> | The -high-effort flag in OpenCL simply reruns the Intel® Quartus® Prime software compilation up to three times with different seeds to fit the design and meet timing. In SYCL, use the -Xsseed=<n> option to change the seed and run multiple compiles yourself while changing the seed value (n) for each compile. To see if the design fits and meets timing, you can check the error code of the icpx command. If it returns error code 42, the design failed to fit or meet timing. If it returns 0, it passed. See -Xsseed=<value> below for more information. |
| -seed=<value> | -Xsseed=<value> | Sets the seed used by the Intel® Quartus® Prime software when generating the FPGA bitstream. The value must be an unsigned integer, and by default, the value is 1. |
| -D<macro_name> | -D<macro_name> | Defines a preprocessor macro named macro_name. |
| -v | -Xsv | FPGA backend generates a verbose output describing the progress of the compilation. |
| -report | -Xsreport | Prints area estimates on the screen after initial compilation. |
| -W | -w | Suppresses all warning messages. |
| -Werror | -Werror | Converts all warning messages into error messages. |
| -g0 | -g0 | Removes source information from the compiler reports and source code and customer IP information from the .aocx file or SYCL executable. |
| -fast-compile | -Xsfast-compile | Runs FPGA bitstream compilation with reduced effort. This option allows faster compile time but at the cost of reduced performance of the compiled FPGA hardware image. Use this flag only for faster development time. It is not intended for production-quality results. |
| Not supported | -reuse-exe | Instructs the compiler to extract the compiled FPGA hardware image from the existing executable and package it into the new executable, saving the device compilation time. This option is helpful only when compiling for hardware. Refer to the Fast Recompile section in the Intel oneAPI Programming Guide for additional information. |
| -incremental | Not supported | In OpenCL, this flag compiles the modifications you make to your OpenCL design incrementally. |
| -ecc | Not supported | Enables error-correction coding on the kernel memories (that is, M20ks and MLABs). |
| -march=emulator | -Xsemulator | Generates an emulator device image. This is the default behavior for SYCL. |
| -march=simulator | -Xssimulation | Compiles a kernel for simulation. |
| -parallel=<num_threads> | -Xsparallel=<num_threads> | Sets the degree of parallelism used in the FPGA bitstream compilation. The <num_threads> value specifies the number of parallel threads you want to use. The maximum recommended value is the number of available cores. Setting this flag is optional. The default behavior is for the Intel® Quartus® Prime software to compile in parallel on all available cores. |
| -profile | -Xsprofile | Instruments the kernel pipeline with performance counters. |
| -profile-shared-counters | -Xsprofile-shared-counters | Turns on the shared performance counters profiling mode when used with the -Xsprofile flag during compilation. |