[Bug libstdc++/47275] New: ofstream::put(255) results in bad stream when built with -fsigned-char on platforms that default to unsigned char

[ceckak at frontier dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47275

           Summary: ofstream::put(255) results in bad stream when built
                    with -fsigned-char on platforms that default to
                    unsigned char
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: cec...@frontier.com


The program below runs without problems (no messages printed to stderr) on x86
linux when built with -fsigned-char or -funsigned-char (or with no flag).

On ARM and PowerPC, the same program fails at i=256 when built with
-fsigned-char, but runs without problems when built with -funsigned-char (or
with no flag).

Not entirely sure whether this is libstdc++ or a g++ bug, but seems likely that
it's an issue with the library.

-----
#include <iostream>
#include <fstream>

int main(void)
{
  std::ofstream of;
  of.open("tmp.bin");
  if (!of.good())
  {
    std::cerr << "bad open(\"tmp.bin\")" << std::endl;
    return 1;
  }
  for (int i = 0; i < 512; ++i)
  {
    of.put(i);
    if (!of.good())
    {
      std::cerr << "bad put(" << i << ")" << std::endl;
      return 1;
    }
  }
  return 0;
}