[Bug c/45620] GCC library allows the use of a negative value for 'NAN'

[jakub at gcc dot gnu dot org]

------- Comment #4 from jakub at gcc dot gnu dot org  2010-09-09 20:45 -------
The C99 standard says the sign should be printed even for NaN, see
7.19.6.1/8:
... "A double argument representing an infinity is converted in one of the
styles [-]inf or [-]infinity — which style is implementation-defined. A
double argument representing a NaN is converted in one of the styles
[-]nan or [-]nan(n-char-sequence) — which style, and the meaning of
any n-char-sequence, is implementation-defined. The F conversion specifier
produces INF, INFINITY, or NAN instead of inf, infinity, or nan,
respectively." ...


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45620