http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51313
Paolo Carlini <paolo.carlini at oracle dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|--- |4.7.0 --- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-12-02 18:11:26 UTC --- This is enough: class ostream; extern "C" { extern int isdigit (int); } ostream& operator<<(ostream&, const unsigned char*); extern ostream cout; int main() { cout << isdigit(0); }