libstdc++/8399: sync_with_stdio(false) breaks unformatted input

[Paolo Carlini]

Hi,

this is a reduced testcase:

////
#include <iostream>
using namespace std;

int main()
{
   ios::sync_with_stdio(false);

   char c;

   cin.get(c);
   cout.put(c);

   return 0;
}
////

What happens with current mainline is that a <newline>
doesn't end the get, whereas this happens with the 'sync'.

Therefore, the issue seems more than vaguely related to
the obnoxious libstdc++/6745 and all that...

Ciao, Paolo.


http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8399