Mark exceptions with default visibility also where they are used (bug #61704). For exceptions that are thrown across library borders to work correctly, the definition of those exceptions needs to be attributed with default visibility both in the library where they are defined and in the code where they are caught. * oct-conf-post-public.in.h: Add new preprocessor macros for visibility attributes of exception classes. * liboctave/util/quit.h (execution_exception), liboctave/util/lo-array-errwarn.h (index_exception): Use new preprocessor macro to flag exception classes that are thrown across library borders.

--- a/liboctave/util/quit.h	Sat Nov 19 17:17:33 2022 +0100
+++ b/liboctave/util/quit.h	Sat Nov 19 16:55:11 2022 +0100
@@ -89,7 +89,7 @@
             && a.column () == b.column ());
   }
 
-  class OCTAVE_API execution_exception : public std::runtime_error
+  class OCTAVE_EXCEPTION_API execution_exception : public std::runtime_error
   {
   public: