I found this bug in cygwin's gcc, but it is probably
general problem.
#include <cmath> fails to undefine math.h's macro log2.
I personally thinks, that like other math functions,
log2 shoud be function in namespace std, not macro.
(Bug found, when I was defining own int log2(int) function
in class)
--
Summary: cmath do not undef log2
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: ppershing at gmail dot com
GCC host triplet: all
GCC target triplet: all
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35104
