R devel - Jul 2005 - Rmath library problems

Hello,

Has anybody successfully called the Rmath library from C using the MS 
Visual Studio compiler (I am using Visual Studio 6.0)?

I have compiled the Rmath library using gcc, and the 'test.c' program 
(which makes a call to qnorm) works fine when compiled with gcc. However, 
I get a fatal memory error when I run it after compiling it with Visual C.
Would this memory problem be related to the compiler, or is it because I 
have not used the right compiler and/or linker options?

Two things puzzles me regarding compilation of Rmath:
1) The gcc compiler only seems to need the Rmath.dll to compile and 
execute. It needs neither Rmath.a nor Rmath.def.
2) The VC compiler needs a '.a'-file, but Rmath.a does not work (cannot 
find the symbols isnan and expm1). It compiles fine with libRmath.a 
however, but then it crashes as mentioned above.

Can anyone explain this to me?


Thanks,

Anders



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On Mon, 25 Jul 2005, Anders Brix Jensen wrote:
> Has anybody successfully called the Rmath library from C using the MS
> Visual Studio compiler (I am using Visual Studio 6.0)?
>
> I have compiled the Rmath library using gcc, and the 'test.c'
program
> (which makes a call to qnorm) works fine when compiled with gcc. However,
> I get a fatal memory error when I run it after compiling it with Visual C.
What is `it'?  No interpretation I can make quite corresponds to the later 
comments.
> Would this memory problem be related to the compiler, or is it because I
> have not used the right compiler and/or linker options?
Probably the last.
> Two things puzzles me regarding compilation of Rmath:
> 1) The gcc compiler only seems to need the Rmath.dll to compile and
> execute. It needs neither Rmath.a nor Rmath.def.
> 2) The VC compiler needs a '.a'-file, but Rmath.a does not work
(cannot
> find the symbols isnan and expm1). It compiles fine with libRmath.a
> however, but then it crashes as mentioned above.
These are actually statements about the linkers when linking against 
Rmath.dll, and not about compiling Rmath.  You should be linking a main 
function compiled under VC++ against a VC++ import library (which you can 
make from Rmath.def by lib /def:Rmath.def /out:Rmath.lib).  Then

cl /MT /Ox  /I..\..\include test.c Rmath.lib

works for me without any errors.

You can find all the background and hints in README.packages.

-- 
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