From the help page:
'R CMD SHLIB' is the mechanism used by 'INSTALL' to compile source
code in packages. 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.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
and from that reference
Note that as R CMD SHLIB uses Make, it will not remake a shared object
just because the flags have changed, and if test.c and test.f both exist
in the current directory
R CMD SHLIB test.f
will compile test.c!
In your case the target systen has changed, but that's not enough to force
recompilation of the .c file.
On Sun, 19 Oct 2008, Andreas Wittmann wrote:
Hello Dirk,
thank you for your chick answer.
I tried another file and there it works. so i removed all files
which were created during of the compilation of add.c in windows
and so i could compile it under ubuntu too. During the windows
compilation there is some *.o file which is created during the
compilation, if i delete it and try the compilation under ubuntu
everything works fine, don't know why?
best regards
Andreas
Dirk Eddelbuettel wrote:
On Sun, Oct 19, 2008 at 01:27:06AM +0200, Andreas Wittmann wrote:
Dear R useRs,
on ubuntu 8.04 i try to create a shared object out of a c-file
this is
// add.c
#include <Rinternals.h>
SEXP addiere(SEXP a, SEXP b)
{
int i, n;
n = length(a);
for (i = 0; i < n; i++)
REAL(a)[i] += REAL(b)[i];
return(a);
}
in terminal i type
R CMD SHLIB add.c
and get
gcc -std=gnu99 -shared -o add.so add.o -L/usr/lib/R/lib -lR
add.o: file not recognized: File format not recognized
my gcc version is 4.2.3 and my R version is 2.7.2.
I can't replicate that on Ubuntu 8.04:
[EMAIL PROTECTED]:/tmp$ R CMD SHLIB add.c
gcc -std=gnu99 -I/usr/share/R/include -fpic -g -O2 -c add.c -o add.o
gcc -std=gnu99 -shared -o add.so add.o -L/usr/lib/R/lib -lR
[EMAIL PROTECTED]:/tmp$
Works fine here. Have you compiled other files? Or are you maybe
missing some -dev packages?
Dirk
Searching R-help, Writing R Extensions and R Installation and
Administration guide
i don't get any idea whats wrong here?
Creating a dll-file on windows xp with the same c-file works fine.
best regards
Andreas
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and provide commented, minimal, self-contained, reproducible code.
--
Brian D. Ripley, [EMAIL PROTECTED]
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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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
