Problem building an API program against 1.4.1

[Buck Huppmann]

On Sun, Jul 31, 2005 at 01:44:09PM -0700, Mike Friedman wrote:

> >Mike Friedman <mikef at ack.Berkeley.EDU> writes:
> >
> >>Thanks, that fixed it!  I must say, I didn't even know about the -R 
> >>option to gcc and can't find it in the gcc man page.  What does -R do 
> >>anyway?
> >
> >>I had just assumed that the '-L/usr/local/kerberos/lib' would be 
> >>sufficient to tell the linker where to find the libraries.  Why did 
> >>only libk5crypto have a problem and not, for example, libkrb5?

> Actually, it's a bit scarier than that.  When I first had the problem, I 
> used ldd to see which shared libraries were needed or expected by my 
> module.  And only libk5crypto showed as 'not found'.  There was an entry 
> for libkrb5.  However, what I didn't notice was that the latter was the 
> version in /usr/lib, which comes installed with FreeBSD and is not the MIT 
> version.  That's why I say 'scary', because if not for the missing 
> libk5crypto, I might never have noticed that I wasn't using the correct 
> libkrb5 either.  Whether or not this would have caused more subtle 
> problems later I can't really say.
> 
> Anyway, thanks for the pointer to info about -R.  I now see that -R 
> appears in the Makefiles used in the MIT K5 build as well.

i won't comment on how capable your system's runtime linker is in using
your vendor's libkrb5.so.${version} in lieu of a your newly installed
version (i would sorta winsomely hope that it's doing the right thing,
given the versioning info built into the libraries and their $(version)
extensions and such forth, but that's why my-administered machines
aren't launching rockets and stuff, and i guess maybe API compatibility
is a completely different fruit from feature compatibility, anyway),
but couldn't all the problems have been avoided by building with

gcc -c ${source} `${newly_installed_krb5}/bin/krb5-config --cflags`
...
gcc -o ${target} ${objects} \
	`${newly_installed_krb5}/bin/krb5-config --libs`

? or (to possibly uncover a bone of contention) does krb5-config not
emit -R options?

i didn't know that FreeBSD exhibited the Solaris-ish non-infection-of-
runtime-linking-path-without--R-option, so thanks for cluing me in to that
anyway, and i'll be watching whom my dynamic executables are runtime-link-
ing with like a hawk from now on