Fw: new requirement of "constexpr" for static const float data members is too restrictive

[Roman Kononov]

$ cat test.cc 
struct X { static float const v=1; };

$ g++ -c -std=gnu++0x test.cc 
test.cc:1:33: error: 'constexpr' needed for in-class initialization of
static data member 'v' of non-integral type

This will break a great deal of existing c++ code preventing easy
transition to c++0x. Maybe, the constexpr requirement should be relaxed
in gnu++0x mode.

Please see the trivial patch.

Thanks
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