GNU Assembler Does Not Accept the --defsym Flag - GNU Assembler Does Not Accept the --defsym Flag Description According to the GNU documentation, you can set an assembler definition by using the --defsym flag, but it does not work in the following form: --defsym MY_VAR=1 . Resolution There is no workaround. Custom Fields values: ['novalue'] Troubleshooting novalue True ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 10.0 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']