[R] Link with C code

[Richards, Tom]

Thanks for the response, Professor Ripley.  I have installed gcc 2.95.2-1,
the recommended compiler.  Taking your advice, I made libR.a, and tried:

gcc -O2 -c doit.c -ID:\Rw1021\src\include

For me, gcc 2.95.2-1 was unable to find even string.h and stdio.h.  I swear
that I downloaded and unzipped everything!  Anyway, I then took advantage of
my earlier 2.95.2, and tried:

gcc -O2 -c doit.c -ID:\Rw1021\src\include
-ID:\gcc-2.95.2\i386-mingw32msvc\include
dlltool --export-all-symbols --output-def doit.def doit.o
gcc --shared -o doit.dll doit.def doit.o -LD:/Rw1021/src/gnuwin32 -lR

The first two lines work for me, but the third line causes complaints that
gcc can't find, for example, crtdll2.o and lmingw32.  I am very puzzled, and
the 2.95.2-1 version is not packaged as nicely as 2.95.2 is.  I am afraid
that I have not installed something properly.
I wonder whether anyone has any insight into what I'm missing here.  Thanks.

Tom


> -----Original Message-----
> From: Prof Brian Ripley [mailto:ripley at stats.ox.ac.uk]
> Sent: Tuesday, January 30, 2001 11:39 AM
> To: Richards, Tom
> Cc: r-help at stat.math.ethz.ch
> Subject: RE: [R] Link with C code
> 
> 
> On Tue, 30 Jan 2001, Richards, Tom wrote:
> 
> > Hello:
> >
> > 	I need to ask a small question about the *recommended* 
> compiler for
> > Windows, mingw32 gcc 2.95.2.
> 
> Actually, it is gcc 2.95.2-1, and the -1 is important.
> 
> > Suppose that I have a file called doit.c, and
> > a file doit.def which specifies that the function foo() be 
> exported. I need
> > to link against Rdll.lib, to make doit.dll, which I want to 
> load into R
> > 1.2.1.  What are the correct mingw32 commands to do this?  
> After playing
> > with gcc, dlltools, dllwrap, and S Programming for some 
> time, all I have
> > come up with is
> >
> > gcc -O2 -c doit.c -ID:\Rw1021\src\include
> > dlltool -e doit.exp -l doit.lib --export-all-symbols doit.o
> > gcc doit.o doit.exp D:\Rw1021\bin\Rdll.lib -o doit.dll
> 
> (Don't know where you got that last line from, but not S 
> Programming for
> sure.)
> 
> > The first line works perfectly, thanks to Sprog, but I 
> cannot get the
> > compiler to find Rdll.lib.  Every time I run the script 
> above, I get the
> > same mesage that VC++ 6.0 gives when I fail to link against 
> Rdll.lib.  Can
> > anyone help?  thanks in advance.
> 
> You link against libR.a, not Rdll.lib.  The makefiles will do 
> all this for
> you, but you could just run (once) in src/gnuwin32
> 
> dlltool --dllname R.dll --def R.exp --output-lib libR.a
> 
> Then
> 
> gcc -O2 -c doit.c -ID:\Rw1021\src\include
> <see below>
> gcc --shared -o doit.dll doit.def doit.o -LD:/Rw1021/src/gnuwin32 -lR
> 
> You need to create doit.def.  The Makefiles use nm and sed, but
> 
> dlltool --export-all-symbols --output-def doit.def doit.o
> 
> should do it.
> 
> It really is easiest just to let the Makefiles take the strain or
> exactly follow a proven recipe.
> 
> >
> > Tom Richards
> >
> >
> >
> > > -----Original Message-----
> > > From: Patrick Wendel [mailto:p.wendel at ic.ac.uk]
> > > Sent: Tuesday, January 30, 2001 8:05 AM
> > > To: r-help at stat.math.ethz.ch
> > > Subject: [R] Link with C code
> > >
> > >
> > >
> > >
> > > Hello,
> > >
> > > I am using cygwin (latest version) and I managed to generate
> > > a dll partly
> > > with rcmd shlib although there was a problem with both the
> > > resouce file (I
> > > had to remove "FILEOS VOS__WINDOWS32") and the command 
> line for gcc
> > > (--shared is not supported for instance).
> > >
> > > So I would like to know which compiler/environment you advise
> > > to use for
> > > windows OS.
> > >
> > > Then I could load the library in R but couldn't call any method.
> > >
> > > Is there a function to know which functions have been
> > > successfully imported
> > > ?
> > >
> > > I've also done the dll in other ways (using gcc and dlltool
> > > as explained on
> > > their website and also using VC++) but I had the same result.
> > >
> > > I suppose I missed something in the dll creation but I cannot
> > > see what.
> > >
> > > Any idea ?
> > >
> > > Many thanks,
> > >
> > > Patrick Wendel
> > >
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> 
> -- 
> 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 272860 (secr)
> Oxford OX1 3TG, UK                Fax:  +44 1865 272595
> 
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