Warning Message: 'pragma_reverse_bitfields' attribute directive ignored - Warning Message: 'pragma_reverse_bitfields' attribute directive ignored Description The Nios II GCC 4 tool chain does not support the C compiler pragma and flag for reverse bit fields. If you try to use the compiler pragma reverse_bitfields , you see the following warning: 'pragma_reverse_bitfields' attribute directive ignored Similarly, the C compiler flag -mreverse-bitfields is unsupported. Resolution Use the GCC 3 tool chain. Custom Fields values: ['novalue'] Troubleshooting novalue True ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 10.0 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']