How to replace dynamic exception specifications: throw(...)

I am working on a project that uses a legacy library which uses function definitions like

void func() throw(some_exception);

Since dynamic exception specifications are removed in C++17 I am wondering how to address this problem.

1. P0003R0 suggests to replace

   void func() throw(some_exception)
   {
       /* body */ 
   }
   

   with something like

   void func()
   {
       try
       {
           /* body */
       }
       catch(const some_exception&) {
          throw;
       }
   }
   

   However, I do not have access to the source code (only the header files).

2. So I am left with trying to "fix" the function definition in the header. So e.g. I could write

   void func() noexcept(false);
   

   But when the function throws an exception, my application still terminates.

How can I change the function definition in the header files or possibly adjust my own project (the places where i use func) to obtain the same behaviour as throw(some_exception) had before C++17?