[Rcpp-devel] Regular Expressions

[Gabor Grothendieck]

On Sat, Mar 2, 2013 at 10:17 AM, Dirk Eddelbuettel <edd at debian.org> wrote:
>
> On 1 March 2013 at 23:03, Gabor Grothendieck wrote:
> | On Fri, Mar 1, 2013 at 9:50 PM, Dirk Eddelbuettel <edd at debian.org> wrote:
> | >
> | > On 1 March 2013 at 21:24, Hadley Wickham wrote:
> | > | > | I searched BH for regex and found nothing so I don't think BH includes
> | > | > | Boost.Regex.
> | > | >
> | > | > Could you register an issue ticket at the r-forge page for BH, please?  There
> | > | > are other things missing too, of course, as we started pretty with the needs
> | > | > of "just" bigmemory and RcppBDT.
> | > |
> | > | But Boost.Regex isn't header only?
> | >
> | > Yup. Found that out the hard way when I wrote it up as a piece for the Rcpp
> | > Gallery. You do need to link.
> | >
> | > Piece now up at http://gallery.rcpp.org/articles/boost-regular-expressions/
> | >
> |
> | I have downloaded boost such that I have this file:
> |
> | C:\MinGW\lib\libboost_regex.a
> |
> | How do I tell Rcpp to use it?
>
> Follow eg the Rcpp Gallery story and use
>
>     Sys.setenv("PKG_LIBS"="C:\MinGW\lib\libboost_regex.a")
>
> as static library can be given "as is".  Else try
>
>     Sys.setenv("PKG_LIBS"="-LC:\MinGW\lib\ -lboost_regex")
>
> which is the standard form.  That should work with the example I posted.
>
> If everthing else, try the documentation for Rcpp (Rcpp-package vignette in
> particular) or Boost.
>

Thanks. I doubled each backslash but unfortunately neither work.

I am able to build the original credit_card_example from the boost
site independently of Rcpp, i.e. this builds and I can run the result:

   rem this works
   C:\MinGW\set_distor_paths.bat
   g++ credit_card_example.cpp -o credit_card_example.exe -lboost_regex

and can also build C++ scripts not using boost; however,

all of the following give:
credit.cpp:6:27: fatal error: boost/regex.hpp: No such file or directory

   library(Rcpp)
   Sys.setenv("PKG_LIBS"="C:\\MinGW\\lib\\libboost_regex.a")
   sourceCpp("credit.cpp", verbose = TRUE)

   library(Rcpp)
   Sys.setenv("PKG_LIBS"="-LC:\\MinGW\\lib\\ -lboost_regex")
   sourceCpp("credit.cpp", verbose = TRUE)

   library(Rcpp)
   Sys.setenv("PKG_LIBS"="-lboost_regex")
   sourceCpp("credit.cpp", verbose = TRUE)

I also tried with Cygwin.  I have this file among others:
C:\cygwin\lib\libboost_regex-mt.dll.a

and tried these but they give the same result:

   library(Rcpp)
   Sys.setenv("PKG_LIBS"="C:\\cygwin\\lib\\libboost_regex-mt.dll.a")
   sourceCpp("credit.cpp", verbose = TRUE)

   library(Rcpp)
   Sys.setenv("PKG_LIBS"="-LC:\\cygwin\\lib\\ -lboost_regex")
   sourceCpp("credit.cpp", verbose = TRUE)

Changing backslash to forward slash does not change anything.

Everything was done with the svn version of Rcpp:

> packageVersion("Rcpp")
[1] '0.10.2.5'