[Octave-bug-tracker] [bug #49306] octave-image 2.6.0 fails to build using clang++

[Marius Schamschula]

URL:
  <http://savannah.gnu.org/bugs/?49306>

                 Summary: octave-image 2.6.0 fails to build using clang++
                 Project: GNU Octave
            Submitted by: mschamschula
            Submitted on: Mon 10 Oct 2016 06:09:56 PM GMT
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Build Failure
                  Status: None
             Assigned to: None
         Originator Name: Marius Schamschula
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.0.3
        Operating System: Mac OS

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Details:

There is a problem building image 2.6.0 under macOS using clang++:

/opt/local/bin/mkoctfile  -Wall -g -O2 -c connectivity.cc
In file included from connectivity.cc:17:
./connectivity.h:42:27: warning: defaulted function definitions are a C++11
extension [-Wc++11-extensions]
        connectivity () = default;
                          ^
./connectivity.h:179:10: error: expected expression
  fill = [&] (const octave_idx_type dim) -> void
         ^
./connectivity.h:170:6: warning: unused variable 'im_v' [-Wunused-variable]
  P* im_v = im.fortran_vec ();
     ^
connectivity.cc:341:3: note: in instantiation of function template
specialization 'octave::image::connectivity::set_padding<boolNDArray, bool>'
requested here
  set_padding (size, padded_size, mask, true);
  ^
2 warnings and 1 error generated.
make: *** [connectivity.o] Error 1

It turns out, that clang++ wants to be given the language standard as an
argument.

I solved this issue by manually adding  -std=c++11 to FLAGGED_MKOCTFILE in
src/Makefile

This should happen programmatically.





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