[julia-users] ccall argument error from within module

[Paul Thompson]

Hi,

I am on Julia 0.3.2 on Debian and have been able to successfully work with 
some library functions using ccall like this:

const mylib="/home/paul/toolbox/DataAcq/libokFrontPanel.so"
x=ccall((:okFrontPanel, mylib), Ptr{Void}, ())

as well as with other functions in the library. I am now moving some of 
these calls into a module, but now I get an error. For instance, if I call 
the function open_board() in the following module:

module rhd2000evalboard

export open_board

function open_board()

     const mylib="/home/paul/toolbox/DataAcq/libokFrontPanel.so"
     x=ccall((:okFrontPanel, mylib), Ptr{Void}, ())

end

end

I get the error:

ERROR: type: open_board: in ccall: first argument not a pointer or valid 
constant expression, expected DataType, got Type{(Any...,)}

I'm not sure why the input tuple is no longer constant. I have tried to use 
the constant tuple as an input to the function as well with no success. Any 
one have any ideas?

Thanks!

Paul