Dear Prof. Ripley,
thank you very much. It works now absolutely fine using a "Makevars"
file with the contents you suggested.
Thanks again,
Roland
> -----Original Message-----
> From: Prof Brian Ripley [mailto:ripley at stats.ox.ac.uk]
> Sent: Thursday, March 09, 2006 12:09 PM
> To: Rau, Roland
> Cc: r-help at stat.math.ethz.ch
> Subject: Re: [R] Linking Rblas [under Windows]
>
> Yes, lots of packages link to Rblas. The help page for SHLIB
> tells you
>
> Please consult section 'Creating shared objects' in the
manual
> 'Writing R Extensions' for how to customize it (for
> example to add
> 'cpp' flags and to add libraries to the link step) and
> for details
> of some of its quirks.
>
> so it should not have been at all hard to find the information.
>
> A portable way would be to have a file Makevars containing
>
> PKG_LIBS=$(BLAS_LIBS)
>
> Note that your precise example will not work in R-2.3.0 when it is
> released, whereas the portable form will. (In fact it only works in
> R-2.2.0 if you have previously make libRblas.a.)
>
> On Thu, 9 Mar 2006, Rau, Roland wrote:
>
> > Dear all,
> >
> > when making a DLL via Rcmd SHLIB is there a way to link against a
> > library such as Rblas (I am on a Windows platform) on a case to case
> > basis?
> >
> > I played a bit around with some self-written C-code which
> should call
> > the function 'dasum' defined in Blas.h.
> > I encountered the following problem:
> >
> > u:\codeplay>Rcmd SHLIB mysumming.c
> > Rcmd SHLIB mysumming.c
> > gcc --shared -s -o mysumming.dll mysumming.def mysumming.a
> > -LU:/R/R-2.2.0/src/gnuwin32 -lg2c -lR
> > mysumming.a(mysumming.o)(.text+0x1b):mysumming.c: undefined
> reference to
> > `dasum_'
> > collect2: ld returned 1 exit status
> > make: *** [mysumming.dll] Error 1
> >
> > My (very limited) knowledge on C tells me that the function
'dasum'
> > is actually defined (due to #include <R_ext/BLAS.h> in my
> C-file) but
> > it needs to be linked against the correct library during the linking
> > procedure. I guess the correct library should be Rblas.dll since I
> > could do it "by hand" calling gcc like this:
> >
> > gcc --shared -s -o mysumming.dll mysumming.def mysumming.a
> > -LU:/R/R-2.2.0/src/gnuwin32 -lg2c -lR -lRblas
> >
> > and it worked.
> >
> > Thank you very much for your help in advance.
> > If you need more details such as the C-Code, the R-Code
> calling C, ..:
> > just let me know.
> >
> > Thanks,
> > Roland
> >
> >> version
> > _
> > platform i386-pc-mingw32
> > arch i386
> > os mingw32
> > system i386, mingw32
> > status
> > major 2
> > minor 2.0
> > year 2005
> > month 10
> > day 06
> > svn rev 35749
> > language R
> >
> > u:\codeplay>gcc --version
> > gcc --version
> > gcc (GCC) 3.4.2 (mingw-special)
> > 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.
> >
> > +++++
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> >
> > ______________________________________________
> > R-help at stat.math.ethz.ch mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide!
> http://www.R-project.org/posting-guide.html
> >
>
> --
> 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
>
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