[Bug c++/54413] Option for turning off compiler extensions for -std=c++11 with respect to complex/fixed-point numbers missing

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54413

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-08-30
     Ever Confirmed|0                           |1
           Severity|major                       |normal

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-08-30 09:55:31 UTC ---
(In reply to comment #0)
> While it
> is possible to turn off GCC's extensions for complex numbers for "old" C++ it

Is it? I don't think that's true.

> is impossible to combine the effects of -ansi with -std=c++11.

That's because -ansi means -std=c++98, it has nothing to do with whether
complex literals are supported.

(In reply to comment #1)
> [usrlit.suffix]/1 says that udlit suffixes that don't start with underscore are
> reserved.

Yes, for future UDLs. Peter's paper proposes new standard UDLs for standard
library types so in order for G++ to support them it must be able to tell the
preprocessor not to treat 1i as a complex literal, so the front-end can turn it
into a call to a UDL operator in the standard library.