[Rcpp-devel] LinkingTo: again

[Dirk Eddelbuettel]

On 13 December 2009 at 21:59, Romain François wrote:
| On 12/13/2009 09:57 PM, Romain François wrote:
| > On 12/13/2009 09:39 PM, Dirk Eddelbuettel wrote:
| >>
| >> On 13 December 2009 at 21:06, Romain François wrote:
| >> | No, you don't need to do any of that. you can if you want (I think you
| >> | define what Matrix uses), but you don't have to. As far as I can see
| >> it,
| >> | adding "LinkingTo: foo" to the DESCRIPTION file just adds
| >> | -Isomewhere/foo/include so that you can then do #include<somefile.h>
| >> | where somefile.h is in the somewhere/foo/include directory.
| >> |
| >> | This is it, no voodoo needed.
| >>
| >> Then that passes the _compile_ stage as you find headers and the blows up
| >> when the _linking_ stage finds no object code.
| >>
| >> Some voodoo needed, after all. ;-)
| >>
| >> [ That is, unless you're Whit Armstrong and you do everything in C++
| >> templates without object code. Rcpp will need -lRcpp to be found
| >> somewhere. ]
| >>
| >> I looked at what Martin had suggested and it is all C code. So no example
| >> there either.
| >>
| >> Dirk
| >
| > This is what I've just realized when trying to make an example
| > (attached).
| 
| BTW, this example assumes that the lib directory was copied over to include.
| 
| > now I understand your point.
| >
| > Then I think this is a feature request for R-devel. Having LinkingTo C++
| > compatible if we follow the convention (yours) of :
| > - having a lib directory at the root of the installed package
| > - containing headers and and a shared object
| >
| > then LinkingTo would add the -L, -l where appropriate.

Not sure if / how that will happen. In the meantime, here is your example
using 'cfunction' carried over from inline:

#!/usr/bin/r

suppressMessages(library(Rcpp))

foo <- '
	RcppStringVector v(x);
	Rprintf( "size = %d\\n", v.size() ) ;
	return R_NilValue ;
        '
funx <- cfunction(signature(x="character"), foo, Rcpp=TRUE, verbose=FALSE)

funx(x=c("Bling", "Blang"))


edd at ron:~/svn/rcpp/pkg/inst/examples/RcppInline$ ./RcppSimple.r
size = 2
edd at ron:~/svn/rcpp/pkg/inst/examples/RcppInline$


I made two changes: We need to protect the \n with a second backslash, and
something is wrong with size() for RcppStringVectorView. For RcppStringVector
it work.   Try that last fix with your linking to example.

Dirk

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