Linking fftw3 lib into SystemVerilog Simulation with DPI-C

Hi there,

Thanks for getting back to me.

I have tried passing in the -64 flag with the -ldflags command using the following commands:

vlog -dpiheader myheader.h fourier_fftw.c fftw3_tb.sv

vsim -c -ldflags "-llibfftw3-3 -llibfftw3f-3 -llibfftw3l-3" -64 work.fftw3_tb

But I still get the following error in the output:

# vsim -c -ldflags "-llibfftw3-3 -llibfftw3f-3 -llibfftw3l-3" -64 work.fftw3_tb 
# Start time: 09:00:33 on Jul 20,2022
# ** Note: (vsim-3812) Design is being optimized...
# Loading sv_std.std
# Loading work.fftw3_tb(fast)
# ** Fatal: (vsim-3828) Could not link 'vsim_auto_compile.dll': cmd = 'C:/intelFPGA_pro/21.3/questa_fse\gcc-7.4.0-mingw64vc15\bin\gcc.exe -shared -o "C:/Users/ALEXBE~1/AppData/Local/Temp\AlexBeasley@ALEXVIVIDQLAPTO_dpi_23316\win64_gcc-7.4.0\vsim_auto_compile.dll" c:/Data/fpga/sim/fftw3_example/work\_dpi\auto_compile@\win64_gcc-7.4.0\fourier_fftw.o   -llibfftw3-3 -llibfftw3f-3 -llibfftw3l-3 -Wl,-Bsymbolic  -L"C:/intelFPGA_pro/21.3/questa_fse/win64" -lmtipli'
# (vsim-50) A call to system(C:/intelFPGA_pro/21.3/questa_fse\gcc-7.4.0-mingw64vc15\bin\gcc.exe -shared -o "C:/Users/ALEXBE~1/AppData/Local/Temp\AlexBeasley@ALEXVIVIDQLAPTO_dpi_23316\win64_gcc-7.4.0\vsim_auto_compile.dll" c:/Data/fpga/sim/fftw3_example/work\_dpi\auto_compile@\win64_gcc-7.4.0\fourier_fftw.o   -llibfftw3-3 -llibfftw3f-3 -llibfftw3l-3 -Wl,-Bsymbolic  -L"C:/intelFPGA_pro/21.3/questa_fse/win64" -lmtipli) returned error code '1'.
# No such file or directory. (errno = ENOENT)
# 
# 
# FATAL ERROR while loading design
# Error loading design
# Error: Error loading design
#        Pausing macro execution

I don't know if it is looking for the libfftw3 libraries in a certain location? Currently they are in the working directory of QuestaSim.

I have attached the example I am using to try and get this working. There is a "compile.do" file which has my commands in to compile the source files and run the simulation.

Any ideas?

Alex