unwanted C9X bits: isnan() et al.

[Gabriel Dos Reis]

Benjamin Kosnik <bkoz@redhat.com> writes:

| 2001-03-19
| 	libstdc++/2311
| 	libstdc++/2311: isnan(), isinf(), etc, not undefined
| 	wants to be able to turn of C9x math bits
| 	http://gcc.gnu.org/ml/gcc-bugs/2001-03/msg00524.html

Hmm.  I lean toward #undefing them.  There are well-formed C++
programs out there which get broken because of those bits.  

Comments?

-- Gaby