Documenting the (dynamic) linking rules for symbol versioning

[Siddhesh Poyarekar]

On Thursday 20 April 2017 06:10 PM, Michael Kerrisk (man-pages) wrote:
> I think that I have failed to provide enough detail for
> you to understand what I meant. Consider the following:
> 
> 1. We want to interpose some symbol in glibc (say, "malloc@GLIBC_2.0")
>    with a symbol of our own (perhaps via a preloaded library).
> 2. In our preloaded shared library, the interposing "malloc"
>    need not be a versioned symbol.
> 
> At least

Ah ok, got it.  The dlsym will result in picking up the latest symbol.

> Note the last line: dlsym() found xyz@@VER_2 (not xyz@VER_3).

Hmm interesting, I thought 'latest' would imply the last version in the
sequence of versions in the map, but I guess it kinda makes sense that
it is the @@ default, similar to how a static linker would pick it up.

Siddhesh