Ralloc clash

On Thu, 23 Nov 2006, Prof Brian Ripley wrote:

Realloc is defined in R_ext/RS.h, and only if STRICT_R_HEADERS is not  
defined.  This *is* documented in 'Writing R Extensions'.

That was the general intention, but seems not to cover this example.  
Howver,

#include <R.h>
#undef Realloc
#define R_Realloc(p,n,t) (t *) R_chk_realloc( (void *)(p), (size_t)((n)  
* sizeof(t)) )
#include <windows.h>

seems to work.

On Thu, 23 Nov 2006, Tom McCallum wrote:

Thank you for your reply.  My mistake - I meant Realloc (missed the  
'e').
This morning I reinstalled MinGW with all the patches suggested by the
Install R on Windows Help page, including w32api-3.7, just to make sure
all was as it should be.  I have put
 #define WIN32_LEAN_AND_MEAN
 at the top of my cpp file (which I did not know about so that was
interesting) but it is still saying there is a conflict between  
Realloc in
objidl.h and windows.h.  Interesting I had a C file which I _did_  
manage
to compile with the R.h and windows.h file in without this error coming
up.  Could there be something going on with g++ that gcc is ignoring?   
I
am no sure it iss a clash now as I cannot find Realloc in the R  
includes
but below is some output I have gathered which may be of assistance.
 In objidl.h (line 532):
        STDMETHOD_(void*,Realloc)(THIS_ void*,ULONG) PURE;
 In R.h it has the solitary line:
	/* for PROBLEM ... Calloc, Realloc, Free, Memcpy, F77_xxxx */
	Can only find a R_alloc but no Realloc.
 ======ERROR MSG OUTPUT==============
$ R CMD SHLIB callcdeclcall.cpp
making callcdeclcall.d from callcdeclcall.cpp
In file included from
c:/MinGW/bin/../lib/gcc/mingw32/3.4.5/../../../../include/objbase.h:73,
                 from
c:/MinGW/bin/../lib/gcc/mingw32/3.4.5/../../../../include/ole2.h:9,
                 from
c:/MinGW/bin/../lib/gcc/mingw32/3.4.5/../../../../include/windows.h:111,
                 from callcdeclcall.cpp:4:
c:/MinGW/bin/../lib/gcc/mingw32/3.4.5/../../../../include/objidl.h:532:45:
macro "Realloc" requires 3 arguments, but only 2 given
make: *** [callcdeclcall.d] Error 1
======END ERROR MSG OUTPUT==============
 Headers in CPP file are:
#include <R.h>
#include <Rinternals.h>
#include <Rdefines.h>
#include <windows.h>
#include <cstdio>
 Thanks,
 Tom
  On Wed, 22 Nov 2006 21:21:15 -0000, Prof Brian Ripley
<ripley at stats.ox.ac.uk> wrote:

Where exactly did you get windows.h from? The recommended source is
w32api-3.7.tar.gz, and there is no Ralloc in any of its header files,
including objidl.h.
 BTW, do you know about defining WIN32_LEAN_AND_MEAN when including
windows.h?  If not, it is worth finding out about.
  On Wed, 22 Nov 2006, Tom McCallum wrote:

Hi everyone,
 Have been trying to include windows.h (from MinGW) and R.h into a
package
and have found that Ralloc is coming up as a clash no matter which
include
ordering I use.  In windows it has 2 arguments and is defined in
objidl.h
and in R.h it is 3 arguments.  Any ideas of how to work round this?
Have
checked the web and have not seen anyone else comment on this.