[Octave-bug-tracker] [bug #44812] clang: ov.h: friend declaration specifying a default argument must be a definition

[Mike Miller]

URL:
  <http://savannah.gnu.org/bugs/?44812>

                 Summary: clang: ov.h: friend declaration specifying a default
argument must be a definition
                 Project: GNU Octave
            Submitted by: mtmiller
            Submitted on: Sun 12 Apr 2015 01:04:23 AM EDT
                Category: Configuration and Build System
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Build Failure
                  Status: Patch Submitted
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

Building with clang 3.6 fails with this error in ov.h:


error: ov.h: friend declaration specifying a default argument must be a
definition


referring to the do_colon_op friend functions.

This problem is discussed by the standards group here:
http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#136

The result being that a friend function declaration with default arguments
must also be the function definition.

Or the default arguments can be declared ahead of the friend declaration,
which is what I did in the attached diff that fixes it for me. Not yet tested
with gcc. Anyone care to confirm that this change looks reasonable?



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File Attachments:


-------------------------------------------------------
Date: Sun 12 Apr 2015 01:04:23 AM EDT  Name: ov.diff  Size: 2kB   By: mtmiller

<http://savannah.gnu.org/bugs/download.php?file_id=33644>

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