defining ptrdiff_t in ncconfig.h creates problems with stddef.h on Mac OS X Tiger

[Ken Mighell]

Dear pnetcdf team,

I was trying to build pnetcdf with OpenMPI using an Apple dual G5  
tower running Mac OS X.

Seems that the line

#define ptrdiff_t int

in ncconfig.h creates havoc whenever source code includes <stddef.h>  
AFTER ncconfig.h has been included.
Specifically, what happens,in that case, is the command

typedef int int;

is generated by <stddef.h> -- which causes compilation a error.

uname -a

gives this result:

Darwin oblix.tuc.noao.edu 8.1.0 Darwin Kernel Version 8.1.0: Tue May  
10 18:16:08 PDT 2005; root:xnu-792.1.5.obj~4/RELEASE_PPC Power  
Macintosh powerpc

mpicc --version

gives this result:

powerpc-apple-darwin8-gcc-4.0.0 (GCC) 4.0.0 20041026 (Apple Computer,  
Inc. build 4061)
Copyright (C) 2004 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There  
is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR  
PURPOSE.

The problem apparently can be made to go away by adding the line

#include <stddef.h>

BEFORE any source code with the line

#include "ncconfig.h"

Does configure need to be made a little smarter?

Or should ptrdiff_t be made a typedef instead of a macro within  
ncconfig.h ?

Sincerely yours,

-Kenneth Mighell

======================================
Kenneth Mighell, Associate Scientist
Kitt Peak National Observatory
National Optical Astronomy Observatory
950 North Cherry Avenue
Tucson, AZ 85719 U.S.A.
email: mighell at noao.edu
voice: (520) 318-8391
fax:   (520) 318-8360




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