Re: msys, swig, cmake, and undefined octave dll routines

[Brad Bell]

On 01/03/2017 10:47 AM, Mike Miller wrote:
... snip ...
> > ... snip ...
> > > > The python version works under mingw-msys, but I am having some trouble
> > > > linking the octave version. For example, I get the message
> > > >       swig_exampleOCTAVE_wrap.cxx:912: undefined reference to `
> > > >       octave_value::octave_value(std::__cxx11::basic_string<char,
> > > > std::char_traits<char>, std::allocator<char> > const&, char)'
... snip ...
> Try building your project with -D_GLIBCXX_USE_CXX11_ABI=0 (see
> https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html for
> more information). Of course, this may conflict with swig or other
> libraries that were built with mingw's gcc 5 using only the new ABI.
... snip ...
It seems you are correct here in that there are longer undefined 
references when I add the flag during compilation. Instead the following 
error occurs at run time:
    The procedure entry point __gmpn_cnd_add_n could not be located in 
the dynamic link library
c:\Octave\Octave-4.0.3\bin\libhogweed-2.5.dll.

One interesting point is that the python-2.7.2 libraries link and run 
fine with the  -D_GLIBCXX_USE_CXX11_ABI=0 flag on the compile lines.
> If that also doesn't work, then you may want to try building swig itself
> using only the toolchain provided with Octave. Or you may want to try
> building Octave natively under your mingw environment instead of relying
> on the official cross-build that may have been built with an
> incompatible toolchain.

I was hoping that I could just use the normal distributions (so that it 
would be easier for users). It would be nice if octave was available 
under the
MinGW Installer.


> > I should mention that I had to change two include instructions that seem
> > like typos to me
> > (because the corresponding files could not be found).
> > To be specific, in oct.h I changed
> >      #include <config.h>
> > to
> >      #include "config.h"
> > and in comment-list.h I changed
> >      #include <base-list.h>
> > to
> >      #include "base_list.h"
> Thanks, these are already fixed in Octave 4.2.0 (which may or may not
> yet work with swig).