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Subject: [Bug c++/55582] New: [C++11] Unable to define string user-defined literal without leading underscore.
Date: Mon, 03 Dec 2012 22:57:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55582

             Bug #: 55582
           Summary: [C++11] Unable to define string user-defined literal
                    without leading underscore.
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: 3dw4rd@verizon.net


This bug is brought to you by the letter 's'.

Now that PR54413 is fixed I tried to implement the user-defined literal
suffixes proposed by Peter Sommerlad in his paper n3468.pdf

I ran into trouble with the string literal suffix 's'.  The hangup is the
-Wliteral-suffix flag which was added for PR52538 in 2012-04-27 by Ollie Wild
aww@google.com which treats any character or string suffix that does *not*
start with '_' as a separate token.  This to fix broken code with printing
macros in inttype.h.

With the paper presented by Peter Sommerlad above, the suffix 's' is proposed
to create std::string, etc.  This wont work with the tokenization introduced
for PR52538.

Basically, I think some deal needs to be struck and could be struck here.

I see five possibilities:
 * let the letter 's' go by as a user-defined literal (with appropriate
comment)
 * If the macros in  are all upper case we could let lower case suffixes go.
 * We could try to figure out if a suffix has been defined as a literal and let
   those through.
 * All the inttype.h macros start with PRI or SCN AFAICS.  Just split those.
 * This problem is above my pay grade.

Test case is forthcoming.

Ideas?

Ed