tag mex function as supporting interleaved complex (or not) * dynamic-ld.cc (dynamic_loader::try_load_mex): New function. (dynamic_loader::load_mex): Call it. Check mex file for __mx_has_interleaved_complex__ symbol and pass flag to octave_mex_function constructor. * ov-mex-fcn.cc (octave_mex_function::m_interleaved): New data member. (octave_mex_function::octave_mex_function): New arg, interleaved. (octave_mex_function::use_interleaved_complex): New function.

--- a/libinterp/corefcn/dynamic-ld.h	Tue Feb 18 12:45:45 2020 -0500
+++ b/libinterp/corefcn/dynamic-ld.h	Tue Feb 18 12:50:18 2020 -0500
@@ -128,6 +128,9 @@
     static std::string mex_uscore_mangler (const std::string& name);
 
     static std::string mex_f77_mangler (const std::string& name);
+
+    static void * try_load_mex (dynamic_library& mex_file,
+                                const std::string& fcn_name, bool& have_fmex);
   };
 }