[Rcpp-devel] Regular Expressions

[Gabor Grothendieck]

On Sat, Mar 2, 2013 at 7:05 PM, Dirk Eddelbuettel <edd at debian.org> wrote:
>
> 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.
>

I had tried both these. It does not seem to be picking up the
PKG_LIBS.  There is no -l... or -L... on the g++ cmd line.

Its also not clear precisely which boost distribution to use.  I had
tried http://nuwen.net/mingw.html (version 8.0) and also tried the
boost library from Cygwin.

If I use the MinGW from nuewn and run this from the Windows cnd line I
get no errors or warnings (note that ^ must be the last character on
the line to escape the newline):

C:\MinGW\set_distro_paths.bat
g++ -DNDEBUG ^
 -L %userprofile%/Documents/R/win-library/2.15/Rcpp/lib/x64/libRcpp.a ^
 -lboost_regex ^
 -I"C:/PROGRA~1/R/R-2.15/include" ^
 -I%userprofile%/Documents/R/win-library/2.15/Rcpp/include ^
 -O2 -Wall -mtune=core2 -c credit.cpp -o credit.o

If tyhat is ok then what would the next step be?

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