[Rcpp-devel] Specify include path with Rcpp.plugin.maker

Dirk Eddelbuettel edd at debian.org
Thu Jul 19 22:48:02 CEST 2012

On 19 July 2012 at 09:17, Vaclav Petras wrote:
| On 18 July 2012 18:33, Dirk Eddelbuettel <edd at debian.org> wrote:
| >
| > On 18 July 2012 at 18:21, Vaclav Petras wrote:
| > | I used it just as an minimal working example. I'm sorry for confusion.
| > |
| > | I need it for _truly new libraries_ and same would apply also for my
| > | own library if i have some.
| > |
| > | As I see I didn't include to my previous email explicit sentence
| > | stating that I need really custom include path. So here it is.
| >
| > As I said, you probably want autoconf / configure to automate the search for
| > headers and resulting configuration.
| >
| Yes, if I will do something more (and real) I will need some configure
| for sure. But still, if it is possible to set flags for linking (-L
| and -Wl,-rpath), for me it makes sense that some straightforward way
| how to set include paths (-I) and additional compiler options should
| exists. In another words, I would expect that Rcpp.plugin.maker will
| have not only 'libs' parameter but also 'include.path' and 'flags'
| parameters.
| > What is your use case?
| My use case is calling GRASS library functions from R [1]. I didn't
| started yet and so far it is not clear what to do. I'm just exploring
| the possibilities now. As a developer I don't have GRASS in standard
| path and I want to do some ad-hoc tests and for them Rcpp.plugin.maker
| is ideal solution. But I think that this approach can be used by
| regular (power) users to write some one-purpose R script (with
| Rcpp+inside).

You could copy and extend our plugin code to provide a plugin in your
package. Rcpp never needed external -I flags as it brings its own headers,
same with RcppArmadillo etc pp.  

The plugin for RcppGSL may be an example, it does set PKG_CPPFLAGS to find
GSL headers. See R/inline.R of the RcppGSL package.

| > Are you sure you don't want to build a package?  In
| > that case you'd modify src/Makevars and would not need the plugin which is
| > just used for smaller-scale use via inline.
| >
| As you can see, I'm not sure what to do. However, building a package
| is highly probable. But I got the impression that some plugin for
| inline package have to be the part of a package if I want to enable to
| write custom functions which use some library other than standard C++
| lib.
| [1] http://lists.osgeo.org/pipermail/grass-stats/2012-July/001422.html

Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com  

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