[Rcpp-devel] Defining template specialisation for wrap on Windows 64bit (Compilation error: 'result_type' does not name a type)

[Renaud Gaujoux]

Hi,

I wanted to "quickly" port my package RcppOctave to run on Windows but
it turned out trickier than expected :(

I am getting compilation errors (8750 lines of errors - see first line below).
The code defines a specialisation for wrap, following the
non-intrusive way described in the vignette. Everything has always
worked smoothly on Linux (Ubuntu 13.10). On Windows there seems to be
some kind of conflict which messes up with type definitions, and this
happens as soon as I include Rcpp.h.
I noticed the "redefined" warnings before the error, but I am not sure
how this can break compilation that much.

Does anybody have a hint on this puzzling issue?
Thank you.

Bests,
Renaud

Minimal C++ code that produces the error:

//rcpp_octave.h

#ifndef _RcppOctave_RCPP_OCTAVE_H
#define _RcppOctave_RCPP_OCTAVE_H

#include <RcppCommon.h>

// Octave libraries
#include <octave/oct.h>

// declaring the specialization
namespace Rcpp {
    template <> SEXP wrap( const octave_value& );
}

// this must appear after the specialization,
// otherwise the specialization will not be seen by Rcpp types
#include <Rcpp.h>
#endif

####

//rcpp_octave.cpp

#include "rcpp_octave.h"

void dummy(){

}


### COMPILATION LOG ###

   [1] "* installing *source* package 'RcppOctave' ..."
   [2] "cygwin warning:"
   [3] "  MS-DOS style path detected: C:/R/R-30~1.2/bin/x64/R"
   [4] "  Preferred POSIX equivalent is:
/cygdrive/c/R/R-30~1.2/bin/x64/R"
   [5] "  CYGWIN environment variable option \"nodosfilewarning\"
turns off this warning."
   [6] "  Consult the user's guide for more details about POSIX
paths:"
   [7] "    http://cygwin.com/cygwin-ug-net/using.html#using-pathnames"
   [8] "-lR: not found"
   [9] "Checking whether R is a shared library... YES"
  [10] "Using R LDFLAGS: -LC:/R/R-30~1.2/bin/x64 -lR"
  [11] "Using R CPPFLAGS: -IC:/R/R-30~1.2/include
-IC:/R/R-30~1.2/include/x64"
  [12] "Checking Octave include directory... "
  [13] "    C:\\Octave\\Octave3.6.4_gcc4.6.2\\include\\octave-3.6.4\\octave"
  [14] "    C:\\Octave\\Octave3.6.4_gcc4.6.2\\include"
  [15] "Checking Octave library directory...
C:\\Octave\\Octave3.6.4_gcc4.6.2\\lib\\octave\\3.6.4"
  [16] "Checking Octave version... 3.6.4"
  [17] "Checking whether to infer output names for Octave function (>=
3.4.3)... YES"
  [18] "RcppOctave Octave module directory...
z:/projects/RcppOctave/libwin/RcppOctave/modules"
  [19] "** libs"
  [20] "Warning: this package has a non-empty 'configure.win' file,"
  [21] "so building only the main architecture"
  [22] ""
  [23] "cygwin warning:"
  [24] "  MS-DOS style path detected: C:/R/R-30~1.2/etc/x64/Makeconf"
  [25] "  Preferred POSIX equivalent is:
/cygdrive/c/R/R-30~1.2/etc/x64/Makeconf"
  [26] "  CYGWIN environment variable option \"nodosfilewarning\"
turns off this warning."
  [27] "  Consult the user's guide for more details about POSIX
paths:"
  [28] "    http://cygwin.com/cygwin-ug-net/using.html#using-pathnames"
  [29] "g++ -m64 -I\"C:/R/R-30~1.2/include\" -DNDEBUG
-IC:/R/R-3.0.2/library/Rcpp/include -DOCT_POST_3_4_0=1
-I\"C:\\Octave\\Octave3.6.4_gcc4.6.2\\include\"
-I\"C:\\Octave\\Octave3.6.4_gcc4.6.2\\include\\octave-3.6.4\\octave\"
-I\"C:\\Octave\\Octave3.6.4_gcc4.6.2\\include\\octave-3.6.4\\octave/../\"
  -I\"C:/R/R-3.0.2/library/Rcpp/include\"
-I\"d:/RCompile/CRANpkg/extralibs64/local/include\"     -O2 -Wall
-mtune=core2 -c rcpp_octave.cpp -o rcpp_octave.o"
  [30] "In file included from
C:\\Octave\\Octave3.6.4_gcc4.6.2\\include\\octave-3.6.4\\octave/../octave/oct.h:31:0,"
  [31] "                 from rcpp_octave.h:10,"
  [32] "                 from rcpp_octave.cpp:21:"
  [33] "C:\\Octave\\Octave3.6.4_gcc4.6.2\\include\\octave-3.6.4\\octave/../octave/config.h:2764:0:
warning: \"_WIN32_WINNT\" redefined [enabled by default]"
  [34] "c:\\rtools\\gcc-4.6.3\\bin\\../lib/gcc/i686-w64-mingw32/4.6.3/../../../../i686-w64-mingw32/include/_mingw.h:244:0:
note: this is the location of the previous definition"
  [35] "In file included from
C:/R/R-3.0.2/library/Rcpp/include/Rcpp.h:50:0,"
  [36] "                 from rcpp_octave.h:25,"
  [37] "                 from rcpp_octave.cpp:21:"
  [38] "C:/R/R-3.0.2/library/Rcpp/include/Rcpp/Language.h:156:21:
error: 'result_type' does not name a type"
  [39] "C:/R/R-3.0.2/library/Rcpp/include/Rcpp/Language.h:161:24:
error: ISO C++ forbids declaration of 'operator()' with no type
[-fpermissive]"
  [40] "C:/R/R-3.0.2/library/Rcpp/include/Rcpp/Language.h: In member
function 'int Rcpp::fixed_call< <template-parameter-1-1>
>::operator()()':"
  [41] "C:/R/R-3.0.2/library/Rcpp/include/Rcpp/Language.h:162:41:
error: no matching function for call to 'as(SEXPREC*&)'"
  [42] "C:/R/R-3.0.2/library/Rcpp/include/Rcpp/Language.h:162:41:
note: candidate is:"
  [43] "C:/R/R-3.0.2/library/Rcpp/include/Rcpp/as.h:144:29: note:
template<class T> T Rcpp::as(SEXP)"
  [44] "C:/R/R-3.0.2/library/Rcpp/include/Rcpp/Language.h: At global
scope:"
  [45] "C:/R/R-3.0.2/library/Rcpp/include/Rcpp/Language.h:170:56:
error: template argument 2 is invalid"
  [46] "C:/R/R-3.0.2/library/Rcpp/include/Rcpp/Language.h:176:41:
error: ISO C++ forbids declaration of 'operator()' with no type
[-fpermissive]"
  [47] "C:/R/R-3.0.2/library/Rcpp/include/Rcpp/Language.h: In member
function 'int Rcpp::unary_call<T, <template-parameter-1-2>
>::operator()(const T&)':"
  [48] "C:/R/R-3.0.2/library/Rcpp/include/Rcpp/Language.h:178:41:
error: no matching function for call to 'as(SEXPREC*&)'"
  [49] "C:/R/R-3.0.2/library/Rcpp/include/Rcpp/Language.h:178:41:
note: candidate is:"
  [50] "C:/R/R-3.0.2/library/Rcpp/include/Rcpp/as.h:144:29: note:
template<class T> T Rcpp::as(SEXP)"
  [51] "C:/R/R-3.0.2/library/Rcpp/include/Rcpp/Language.h: At global
scope:"
  [52] "C:/R/R-3.0.2/library/Rcpp/include/Rcpp/Language.h:187:62:
error: template argument 3 is invalid"
  [53] "C:/R/R-3.0.2/library/Rcpp/include/Rcpp/Language.h:193:52:
error: ISO C++ forbids declaration of 'operator()' with no type
[-fpermissive]"
  [54] "C:/R/R-3.0.2/library/Rcpp/include/Rcpp/Language.h: In member
function 'int Rcpp::binary_call<T1, T2, <template-parameter-1-3>
>::operator()(const T1&, const T2&)':"
  [55] "C:/R/R-3.0.2/library/Rcpp/include/Rcpp/Language.h:196:41:
error: no matching function for call to 'as(SEXPREC*&)'"
  [56] "C:/R/R-3.0.2/library/Rcpp/include/Rcpp/Language.h:196:41:
note: candidate is:"
  [57] "C:/R/R-3.0.2/library/Rcpp/include/Rcpp/as.h:144:29: note:
template<class T> T Rcpp::as(SEXP)"
  [58] "In file included from
C:/R/R-3.0.2/library/Rcpp/include/Rcpp/Module.h:85:0,"
  [59] "                 from
C:/R/R-3.0.2/library/Rcpp/include/Rcpp.h:63,"
  [60] "                 from rcpp_octave.h:25,"
  [61] "                 from rcpp_octave.cpp:21:"