[Bug c++/52485] New: [c++11] add an option to disable c++11 user-defined literals

[eu at doxos dot eu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52485

             Bug #: 52485
           Summary: [c++11] add an option to disable c++11 user-defined
                    literals
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: eu@doxos.eu


Some upstream code (e.g. #50917 for Mozilla, I have issues with Qt4's SLOT(...)
macros) is broken because of the support for c++11 literals in 4.7. In all
cases I've seen the cause was missing space between constructs like #define
FOO(a) "0"#a.

Sine this feature is little used, but lot of code, it would be reasonable to
provide a switch to disable user-defined literals, so that code which needs
c++11 but at the same time links to (technically broken) libs can be compiled,
until those libs get fixed upstream.