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

[jyasskin at gcc dot gnu.org]

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

             Bug #: 50258
           Summary: -std=gnu++0x should allow in-class initialization of
                    static const floating types without constexpr
    Classification: Unclassified
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: jyasskin@gcc.gnu.org


In c++98 mode, gcc accepts in-class initialization of static const floating
members as an extension. This extension have been removed in C++0x mode, even
when gnu extensions are specifically requested with -std=gnu++0x. It would be
nice to keep the extension, especially since the C++0x draft was only changed
to disallow it in the FDIS.


$ gcc-4.6 --version
gcc-4.6 (GCC) 4.6.1
$ cat test.cc
struct Foo {
  static const double d = 3.14;
};
const double Foo::d;
$ gcc-4.6 -c -Wall test.cc
$ gcc-4.6 -c -Wall -std=gnu++0x test.cc
test.cc:2:27: error: 'constexpr' needed for in-class initialization of static
data member 'd' of non-integral type
test.cc:4:19: error: 'const double Foo::d' is not a static member of 'struct
Foo'
test.cc:4:14: error: uninitialized const 'Foo::d' [-fpermissive]
$