Re: gcc7 build error with recent tip

[John W. Eaton]

On 06/23/2017 06:39 PM, Dmitri A. Sergatskov wrote:
> On Fri, Jun 23, 2017 at 4:58 PM, Dmitri A. Sergatskov
> <address@hidden <mailto:address@hidden>> wrote:
>
>     On Fri, Jun 23, 2017 at 4:38 PM, Mike Miller <address@hidden
>     <mailto:address@hidden>> wrote:
>
>         On Fri, Jun 23, 2017 at 16:03:00 -0500, Dmitri A. Sergatskov wrote:
>         > It failing the same way on few computers (all with Fedora 26-beta).
>         > Perhaps it is
>         > a compiler issue (clang does not have problem with it). It persists
>         > (see fedora builds on http://buildbot.octave.org:8010/waterfall
>         <http://buildbot.octave.org:8010/waterfall>)
>
>         I get the same error with gcc-snapshot in Debian (gcc trunk
>         r249349).
>         Next stop bug tracker.
>
>
>     ​It compiles if I set CXXFLAGS to -std=c++1z or -std=c++14
>     and fails again with -std=c++11
>
>
> ​I managed to confuse myself with all those flags -- it compiles with ​
> -std=c++1z
> fails with either -std=c++11 or std=c++14:
>
> <<<<
> HG ID for this build is "6fe13cd3543c"

I admit this code is a bit tricky.  I was trying to come up with a way 
to use a single template that would cover both of these cases:

  static octave_value
  dump_container_map (const std::map<std::string, std::list<std::string>>&)

  static octave_value
  dump_container_map (const std::map<std::string, std::map<std::string>>&)

It works for me with gcc version 6.3.0 20170516 (Debian 6.3.0-18).

Does it help to add statements to explicitly instantiate these forms for 
the initializer list?  Or to provide non-template wrapper functions?

jwe