Re: Portability of -no-undefined

[Bob Friesenhahn]

On Tue, 19 Oct 2004, Noah Misch wrote:
> easy to craft a link line that omits dependencies, thereby preventing the
> resolution of all symbols.  For example, if libfoo depends on libfoo_dep, this
> might work on GNU/Linux,
>
> libtool --mode=link $(CC) -o libfoo.la foo.lo bar.lo

It is worth pointing out that providing only partial dependencies at 
link time may work under modern GNU/Linux, but it depends on 
non-portable behavior.  Even under GNU/Linux, if a dependency is 
linked differently (itself omitting a dependency), linking may start 
to fail since not all the information the linker needs is available.

Libtool helps in this regard since the .la files contain dependency 
information so if a dependency provides a .la file, libtool then knows 
its own dependencies so the dependent package doesn't need to list the 
remaining dependencies (which may be system specific).

Bob
======================================
Bob Friesenhahn
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http://www.simplesystems.org/users/bfriesen