[Bug c++/50258] [C++0x] -std=gnu++0x should allow in-class initialization of static const floating types without constexpr

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50258

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-09-23 
12:18:03 UTC ---
How about using a permerror instead?  Since it's deprecated, requiring users to
give -fpermissive if they want to use it in C++11 seems reasonable to me.