[Bug libstdc++/23757] iostreams hex formatting for signed integers treats than as unsigned

[x at xman dot org]

------- Additional Comments From x at xman dot org  2005-09-07 16:03 -------
The ANSI definition for %x (or %X) only covers unsigned integers. Surely then
doing hex formatting on a signed integer would at the very least be undefined
behavior.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23757