Subject: Re: "-Ldir -lname" vs. "dir/libname.so"
To: Todd Vierling , Nick Hudson <firstname.lastname@example.org>
From: Nick Hudson <email@example.com>
Date: 03/14/2002 16:45:43
On Thursday 14 March 2002 3:52 pm, Todd Vierling wrote:
> On Thu, 14 Mar 2002, Nick Hudson wrote:
> : > [ELF]
> : >
> : > cd libfoo
> : > cc -shared -o libfoo.so.0.0 -Wl,-soname,libfoo.so.0 ... \
> : > -R/usr/pkg/some/lib -L/usr/pkg/some/lib -lsomelib
> : > ln -s libfoo.so.0.0 libfoo.so.0
> : > ln -s libfoo.so.0.0 libfoo.so
> : >
> : > cd ../libbar
> : > cc -shared -o libbar.so.0.0 -Wl,-soname,libbar.so.0 ... \
> : > -R/usr/pkg/foo/lib -L../libfoo -lfoo \
> : > -Wl,-rpath-link,/usr/pkg/some/lib
> : Two things to note about this are
> : - The -Wl,-rpath-link part is no longer needed. The 2.11.2 based ld and
> : the patched 2.9.3 ld (in 1.5.3) automatically look for NEEDED
> : libraries in the RPATH of the dependent library.
> : - The uninstalled libbar won't contain the necessary RPATH to find the
> : uninstalled libfoo.
> You just contradicted yourself. If -Wl,-rpath-link is not needed as you
> say, then the only place ld can find out libfoo's location is from the rpath
> ... which points at a directory where libfoo is not yet installed! (Yes,
> I'm assuming that libbar is being linked with an rpath pointing at *only*
> the install path of libfoo, as I illustrated in my examples.)
The -rpath-link is not needed to find libsome (the already installed library)
as I assumed that its install directory was passed using -R when creating
> The -rpath-link is needed in order to resolve uninstalled dependencies, such
> as the one on libfoo. This is the *correct* way to do a link of a shared
> object with dependencies on ELF.
Do a search for -rpath-link in libtool... Find it? No? Well I guess libtool's
doing the wrong thing then. Feel free to fix libtool. :)
All of which doesn't really solve Johnny's problem.