[Bug c++/51186] New: declaring main() with auto but without --std=c++11 gives inconsistent error messages

[Bug c++/51186] New: declaring main() with auto but without --std=c++11 gives inconsistent error messages

[wswiktor at poczta dot fm]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51186

             Bug #: 51186
           Summary: declaring main() with auto but without --std=c++11
                    gives inconsistent error messages
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: wswiktor@poczta.fm


When I try to compile this code without specifying C++11 or C++0x standard

    auto main()->int
    {
    }

the following conflicting messages are generated:

    cpp.cpp:1:14: error: top-level declaration of 'main' specifies 'auto'
    cpp.cpp:1:14: error: 'main' function with late return type not declared
with 'auto' type specifier

The second one should be disabled when not in C++11 mode, or replaced with one
saying that funtions with late return type are not allowed.

[Bug c++/51186] declaring main() with auto but without --std=c++11 gives inconsistent error messages

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51186

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |jason at gcc dot gnu.org
         Resolution|                            |FIXED
   Target Milestone|---                         |4.7.0

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> 2011-11-17 21:05:00 UTC ---
Fixed to say

x.C:3:14: error: trailing return type only available with -std=c++11 or
-std=gnu++11

[Bug c++/51186] declaring main() with auto but without --std=c++11 gives inconsistent error messages

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51186

--- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> 2011-11-17 21:00:34 UTC ---
Author: jason
Date: Thu Nov 17 21:00:30 2011
New Revision: 181455

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=181455
Log:
    PR c++/51186
    * decl.c (grokdeclarator): Improve C++98 trailing return diagnostic.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/auto27.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/decl.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/g++.dg/cpp0x/trailing2.C