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From: "marc.glisse at normalesup dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/52521] New: [C++11] user defined literals and order of declaration
Date: Wed, 07 Mar 2012 14:00:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52521

             Bug #: 52521
           Summary: [C++11] user defined literals and order of declaration
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: marc.glisse@normalesup.org


#include <cstdlib>
int operator "" _w(const char*);
int operator "" _w(const char*, std::size_t);
int main() {
  123_w;
}

a.cc: In function 'int main()':
a.cc:5:3: error: unable to find numeric literal operator 'operator"" _w'

The problem disappears if I switch the 2 declarations...

Btw, mangling these operators like functions called li_w taking the same
arguments is strange, I could have such a function in my code.