Re: [Rd] Ralloc clash

From: Tom McCallum <>
Date: Thu 23 Nov 2006 - 10:48:09 GMT

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


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

                  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>



On Wed, 22 Nov 2006 21:21:15 -0000, Prof Brian Ripley <> 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.

Dr. Thomas McCallum
Systems Architect,
Level E Limited
ETTC, The King's Buildings
Mayfield Road,
Edinburgh EH9 3JL, UK
Work  +44 (0) 131 472 4813
Fax:  +44 (0) 131 472 4719

Level E is a limited company incorporated in Scotland. The c...{{dropped}}

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