[Rcpp-devel] Regular Expressions

On 2 March 2013 at 18:47, Gabor Grothendieck wrote:
| 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'

Sorry that this is so frustrating, but this (IMNSHO) all just Windows...

I would try two things:

      a) forward slashes (no escaping needed)

      b) use verbose=TRUE so that you see the R CMD ... invocation.

Your initial boost test was key.  We know you have a working boost library;
we know Rcpp can create working code, now we just need to tie'em together.