[Rcpp-devel] Specifying additional include path in Rcpp package

[Dirk Eddelbuettel]

Hi Rainer,

On 18 July 2013 at 16:51, Rainer M Krug wrote:
| Hi
| 
| I am sure thsi has been answered or is in the manuals, but I just can't
| find it - I probably made a stupid mistake.
| 
| But I don't manage to specify additional include paths in a package using Rcpp.
| 
| in my grassRLink.h file I have:
| 
| ,----
| | #ifndef _grassRLink_grassRLink_H
| | #define _grassRLink_grassRLink_H
| | 
| | #include <Rcpp.h>
| | 
| | #include <stdio.h>
| | #include <stdlib.h>
| | 
| | #include <grass/gis.h>
| | #include <grass/raster.h>
| | #include <grass/glocale.h>
| | 
| | using namespace Rcpp;
| | 
| | RcppExport SEXP readRast(String name, String mapset, int row, int col) ;
| | #endif
| `----
| 
| and to find the files grass/gis.h, grass/raster.h and grass/glocale.h I
| have the following in y Makevars  
| 
| ,----
| | #!/bin/bash
| | ## Use the R_HOME indirection to support installations of multiple R version
| | PKG_LIBS = `$(R_HOME)/bin/Rscript -e "Rcpp:::LdFlags()"`
| | PKG_LIBS = $PKG_LIBS:/Applications/GRASS/GRASS-7.0.app/Contents/MacOS/include/

That is for __linking__ but not compiling and hence does nothing for header
files.  

You want to set PKG_CXXFLAGS, or PKG_CPPFLAGS.

One (in my eyes) easy way is to look at existing packages...  Pick one where
you know an external library and headers are used.

| | ## some commentsAs an alternative, one can also add this code in a file 'configure'
| `----
| 
| with the idea that the include path is added. But when I use load_all(.)
| to laod the package, I get the following error:
| 
| ,----
| | > load_all(".", recompile=TRUE)
| | Loading grassRLink
| | Re-compiling grassRLink
| | '/Library/Frameworks/R.framework/Resources/bin/R' --vanilla CMD INSTALL  \
| |   '/Users/rainerkrug/Documents/Projects/grassRLink'  \
| |   --library='/var/folders/50/wcr5bjwn75q595n6x82gxj280000gn/T//RtmpgWwh9v'  \
| |   --no-R --no-data --no-help --no-demo --no-inst --no-docs --no-exec  \
| |   --no-multiarch --no-test-load --preclean 
| | 
| | * installing *source* package 'grassRLink' ...
| | ** libs
| | llvm-g++-4.2 -arch x86_64 -I/Library/Frameworks/R.framework/Resources/include -DNDEBUG  -I/usr/local/include -I"/Users/rainerkrug/Library/R/3.0/library/Rcpp/include"  -UNDEBUG -Wall -pedantic -g -O0 -fPIC  -mtune=core2 -g -O2  -c RcppExports.cpp -o RcppExports.o
| | llvm-g++-4.2 -arch x86_64 -I/Library/Frameworks/R.framework/Resources/include -DNDEBUG  -I/usr/local/include -I"/Users/rainerkrug/Library/R/3.0/library/Rcpp/include"  -UNDEBUG -Wall -pedantic -g -O0 -fPIC  -mtune=core2 -g -O2  -c grassRLink.cpp -o grassRLink.o
| | In file included from grassRLink.cpp:2:
| | grassRLink.h:10:23: error: grass/gis.h: No such file or directory
| | grassRLink.h:11:26: error: grass/raster.h: No such file or directory
| | grassRLink.h:12:27: error: grass/glocale.h: No such file or directory
| | grassRLink.cpp: In function 'Rcpp::NumericVector readRast(Rcpp::String, Rcpp::String, int, int)':
| | grassRLink.cpp:7: error: new declaration 'Rcpp::NumericVector readRast(Rcpp::String, Rcpp::String, int, int)'
| | grassRLink.h:28: error: ambiguates old declaration 'SEXPREC* readRast(Rcpp::String, Rcpp::String, int, int)'
| | grassRLink.cpp:9: error: 'RASTER_MAP_TYPE' was not declared in this scope
| | grassRLink.cpp:9: error: expected `;' before 'data_type'
| | grassRLink.cpp:16: error: 'G_gisinit' was not declared in this scope
| | grassRLink.cpp:19: error: 'Rast_open_old' was not declared in this scope
| | grassRLink.cpp:22: error: 'data_type' was not declared in this scope
| | grassRLink.cpp:22: error: 'Rast_map_type' was not declared in this scope
| | grassRLink.cpp:25: error: 'Rast_allocate_buf' was not declared in this scope
| | grassRLink.cpp:28: error: 'Rast_window_rows' was not declared in this scope
| | grassRLink.cpp:29: error: 'Rast_window_cols' was not declared in this scope
| | grassRLink.cpp:34: error: 'Rast_get_row' was not declared in this scope
| | grassRLink.cpp:40: error: 'CELL_TYPE' was not declared in this scope
| | grassRLink.cpp:42: error: 'FCELL_TYPE' was not declared in this scope
| | grassRLink.cpp:44: error: 'DCELL_TYPE' was not declared in this scope
| | grassRLink.cpp:12: warning: unused variable 'nrow'
| | grassRLink.cpp:12: warning: unused variable 'ncol'
| | grassRLink.cpp:49: warning: no return statement in function returning non-void
| | make: *** [grassRLink.o] Error 1
| | ERROR: compilation failed for package 'grassRLink'
| | * removing '/private/var/folders/50/wcr5bjwn75q595n6x82gxj280000gn/T/RtmpgWwh9v/grassRLink'
| | * restoring previous '/private/var/folders/50/wcr5bjwn75q595n6x82gxj280000gn/T/RtmpgWwh9v/grassRLink'
| | Error: Command failed (1)
| | > 
| `----
| 
| telling me that the additional header files are not found, even though
| the path seems to be added:
| 
| ,----
| | -I/Library/Frameworks/R.framework/Resources/include 
| `----

Well ... are the grass/* files in that directory?
 
| It is probably my limited C / C++ expertise, but wat is going on here?
| 
| I am working on OS X Mountain Lion, gcc is installed via homebrew, and I
| can compile other packages without problems.

"Other packages" may have working configurations, yours does not yet it seems.

Dirk
 
| You can find the package at github:
| 
| https://github.com/rkrug/grassRLink
| 
| Any suggestions?
| 
| Thanks,
| 
| Rainer
| 
| -- 
| Rainer M. Krug
| 
| email: RMKrug<at>gmail<dot>com
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-- 
Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com