[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: cannot undefine with -u option to ld
From: |
Nick Clifton |
Subject: |
Re: cannot undefine with -u option to ld |
Date: |
18 Sep 2001 10:50:24 +0100 |
User-agent: |
Gnus/5.0808 (Gnus v5.8.8) Emacs/20.7 |
Hi,
> It appears that when "-u" is used, ld will
> attempt to define the symbol in the usual way
> (library searches, etc), but , if it cannot, it
> fails silently. It inserts the symbol in the
> symbol table, annotates it with UND (to indicate
> that it is undefined), but then completes without
> indicating a warning or an error.
This is actually the accepted behaviour and probably should not be
changed. (There can be quite a few undefined symbol references even
in a fully resolved link).
If you need to force a symbol to be resolved, simply place it into an
object file and then include it on the link command line. eg to force
a reference to "foo":
% cat foo.c
int foo_ref asm ("foo");
% gcc -c foo.c
% gcc myprog.o foo.o
Cheers
Nick