--no-undefined-version

[H.J. Lu]

On Tue, Jan 5, 2010 at 5:04 PM, Ian Lance Taylor <iant@google.com> wrote:
> The GNU ld option --no-undefined-version is defined as follows:
>
>    Normally when a symbol has an undefined version, the linker will
>    ignore it.  This option disallows symbols with undefined version
>    and a fatal error will be issued instead.
>
> As far as I can tell, what the option actually does is this:
>
> For each version defined in a version script:
>  for each global symbol pattern in that version listed in the script:
>    if the pattern is a literal string--not a wildcard pattern:
>      if the pattern does not match any symbol defined in the link:
>        give an error.
>
> In other words, the option does not check for symbols with undefined
> versions.  It checks for cases where a version script explicitly lists
> a symbol, but the symbol is not defined.
>

That is what I meant by "a symbol has an undefined version".
A version script declares a symbol with multiple versions. This
option checks if any version of such a symbol is undefined.

-- 
H.J.