Importing C Function into System Verilog using DPI with 3-step process

Hi all,

I want to import some C math function such as the sin and atan into my testbench using the DPI. It works fine when I use the "irum" command, the code should be right. But when I use the 3-step process it doesn't work. From the referrence manual I know that the c file should be first complied to the libdpi.so, but since I use the standare C function, which file should I compile? And I try to skip the compilation step and add the -sv_lib libm.so argument, it also doesn't work.

I greatly appreciate any help.