[Rd] Ralloc clash

[Prof Brian Ripley]

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.
>>> 
>> 
>> 
>> 
>
>

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595