[Bug libstdc++/12859] New: Output of floating point value changes global lokale

[pthomas at suse dot de]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12859

           Summary: Output of floating point value changes global lokale
           Product: gcc
           Version: 3.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libstdc++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pthomas at suse dot de
                CC: aj at suse dot de,gcc-bugs at gcc dot gnu dot org

Putting out a floating point value seems to change the global C locale. Just
compile and run the attached test program and you'll see that the last call
to isalpha returns false instead of the expected true. If you comment out the
line that outputs the fp value, isalpha returns true as expected.

3.3.1 and 3.3.2 also have the same bug that I consider quite nasty and 
unexpected.