[R] rtools fstream error

[sunaga at telenet.be]

Hi,

when writing a simple cpp function to be run in R I obtain a compilation error as soon as I include fstream. Any hints of what goes wrong and how to fix it? It's Windows 7 64-bit, R-3.1.2 and Rtools32. An example to recreate the error:

    #include <R.h>
    #include <Rdefines.h>
    #include <fstream>
    using namespace std;
    
    extern "C" SEXP test(SEXP x) {
      SEXP result;
      
      PROTECT(result = allocVector(REALSXP,1));
      REAL(result)[0] = REAL(x)[0]*5;
    
      UNPROTECT(1);
      return result;
    }

Output:

    > R CMD SHLIB test.cpp
    g++ -m64 -I"C:/PROGRA~1/R/R-31~1.2/include" -DNDEBUG     -I"d:/RCompile/CRANpkg/
    extralibs64/local/include"     -O2 -Wall  -mtune=core2 -c test.cpp -o test.o
    In file included from c:\rtools\gcc-4.6.3\bin\../lib/gcc/i686-w64-mingw32/4.6.3/
    ../../../../include/c++/4.6.3/fstream:42:0,
                     from test.cpp:3:
    c:\rtools\gcc-4.6.3\bin\../lib/gcc/i686-w64-mingw32/4.6.3/../../../../include/c+
    +/4.6.3/bits/codecvt.h:216:45: error: macro "length" passed 4 arguments, but tak
    es just 1
    In file included from c:\rtools\gcc-4.6.3\bin\../lib/gcc/i686-w64-mingw32/4.6.3/
    ../../../../include/c++/4.6.3/fstream:921:0,
                     from test.cpp:3:
    c:\rtools\gcc-4.6.3\bin\../lib/gcc/i686-w64-mingw32/4.6.3/../../../../include/c+
    +/4.6.3/bits/fstream.tcc:826:60: error: macro "length" passed 4 arguments, but t
    akes just 1
    c:\rtools\gcc-4.6.3\bin\../lib/gcc/i686-w64-mingw32/4.6.3/../../../../include/c+
    +/4.6.3/bits/fstream.tcc:943:39: error: macro "length" passed 4 arguments, but t
    akes just 1
    In file included from c:\rtools\gcc-4.6.3\bin\../lib/gcc/i686-w64-mingw32/4.6.3/
    ../../../../include/c++/4.6.3/fstream:42:0,
                     from test.cpp:3:
    c:\rtools\gcc-4.6.3\bin\../lib/gcc/i686-w64-mingw32/4.6.3/../../../../include/c+
    +/4.6.3/bits/codecvt.h:215:7: error: expected ';' at end of member declaration
    c:\rtools\gcc-4.6.3\bin\../lib/gcc/i686-w64-mingw32/4.6.3/../../../../include/c+
    +/4.6.3/bits/codecvt.h:217:7: error: expected unqualified-id before '{' token
    make: *** [test.o] Error 1 

Thanks,
sunaga