[Mingw-users] Problem with mingw and gcc

[Mark H. <md...@te...>]

I am a real newby to mingw and gcc.  I hope you do not jump on me too 
hard if the answer to this question seems obvious to the more experienced.

I have installed Mingw using the executable installer for Windows.  I am 
trying to compile files for the fftw package of Fast Fourier Transform 
routines.  These claim to be in ANSI C, and I know they have been 
compiled before using mingw and gcc.  I need to do it differently in 
order to produce a dll version that uses the stdcall  calling 
conventions used by Visual Basic, Delphi Pascal and perhaps other 
languages.  I haven't yet got to the part about compiling and linking 
for stdcall, because this problem has popped up first.

When I try to compile the files, I get errors like this:

In file included from align.c:23:
ifftw.h:143:6: #error sizeof void* is unknown!
align.c: In function `fftw_alignment_of':
align.c:38: `uintptr_t' undeclared (first use in this function)

It seems to me that some rather basic definitions must be missing, like 
a missing header file of really low level stuff.

Any suggestions what might be causing this and perhaps a fix?

Thanks much,

Mark Holm
md...@te...