Re: Patchless modification of Lua source code

[Philippe Verdy <verdy_p@...>]

If you use non-shared libraries, in fact the result is unpredictable, you could as well have seen:

Hello from main

        Hello from func1

        Hello from func2

        Back to func1

Back to main

        Hello from func2

Back to main

That's what I was demonstrating: there's undefined behavior ONLY if you use non-shared libraries because the order of units in these libraries is NOT significant.

And in fact makes the use of "pre-linked" even more relevant to this discussion.

Only non-shared libraries are not portable if you have multiple units defining the same symbol.

But you are not required to use them if, instead, you use a linker directly and specify a full list of units names (or shared library names) where the order of resolution is entirely determined.