Re: linking small programs with AC_LINK_IFELSE

[Benoit Sigoure]

Quoting Ralf Wildenhues <address@hidden>:

> * Bob Rossi wrote on Thu, Jan 18, 2007 at 09:54:24PM CET:
> > Well, lets say I modified libexpat and it's now different than the one
> > on the system.
> [...]
> > However, if for some reason the local expat build fails, my check to
> > compile a small program still works because it picks up the installed
> > one on the system.
>
> So add a symbol to your modified libexpat.  Link against that symbol in
> your source code.  Use -no-undefined.  Then programs will fail to link
> (and on some systems, those where -no-undefined works well, also
> libraries will fail to link).  Of course you've broken the API now.

Why would it break the API if he simply adds a dummy symbol to make the
difference between stock libexpat and his modified version?

--
SIGOURE Benoit aka Tsuna
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