Re: [Gumstix-users] C++ segmentation fault

[Dave H. <dhy...@gm...>]

Hi Tiffany,

> It runs up until the last line of code when it outputs a segmentation fault.
>  Any ideas on why I am getting the output fault?

I wrote the following program (using buildroot 1200) and it almost works:

#include <iostream>
#include <fstream>

using namespace std;

int main( int argc, char **argv )
{
    cout << "fstream test program" << endl;

    ofstream    ofs;

    ofs.open( "/mnt/cf/output.txt" );
    if ( !ofs.is_open() )
    {
        cerr << "open of /mnt/cf/output.txt failed" << endl;
        return 1;
    }

    for ( int arg = 1; arg < argc; arg++ )
    {
        ofs << "argv[ " << arg << " ] = '" << argv[ arg ] << "'" << endl;
    }

    double  d = 1.234;

    ofs << d << endl;

    ofs.close();

    return 0;
}

The ofs << d portion fails. I believe that this is because the
libstdc++ that comes with gcc requires the use of locales when
streaming a double.

uClibc has no locale support.

You may need to look at uClibc++
http://cxx.uclibc.org/

or you may need to make your buildroot use glibc instead of uClibc (I
haven't done this myself, but I've heard that others have).

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/