Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

error: Unexpected use of HDL library function(s)

Hi,

I'm using the 16.1 SDK to develop an OpenCL library. After added a second input parameter to my function, I get this error message (twice): 

   error: Unexpected use of HDL library function(s) (possibly due to taking the address of the function)!
   error: Unexpected use of HDL library function(s) (possibly due to taking the address of the function)!

I'm definitely not taking the address of the function. Do you have any suggestion as to what this error message could mean? If I remove the second argument to the function everything works as expected. This seems like a bug to me. (The entire setup is basically the same as in the OpenCL library example where they show a floating point division example.)

Thanks,

Hanno

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    8 years ago

    Upon further testing, this seems to be related to the datatype. If I use "unsigned long" in the RTL library, I get the error. If I use "unsigned long long" it works. So there seems to be a mismatch of the inferred width between the different compiler parts. (I guess the vague C standard is partly to blame here, but a better error message would have saved me a lot of time).