Re: PATCH: Add STB_SECONDARY support

[Alan Modra <amodra at gmail dot com>]

On Tue, Jul 03, 2012 at 05:18:42PM -0700, H.J. Lu wrote:
>  0x0000000000000001 (NEEDED)             Shared library:
> [libbfd-2.22.52.20120703.so]
>  0x0000000000000001 (NEEDED)             Shared library: [libz.so.1]
>  0x0000000000000001 (NEEDED)             Shared library: [libdl.so.2]
>  0x0000000000000001 (NEEDED)             Shared library: [libc.so.6]
> 
> libbfd-2.22.52.20120703.so is linked against libiberty.a.  When you build
> binutils, libbfd will include a backup copy of standard functions
> which don't exist
> in libc.so at the time when you compile it.  Even after you upgrade your
> libc.so with the latest and greatest standard functions, ld stiil uses
> the backup one from libiberty since ld.so searches libbfd.so before
> libc.so.6.

Like I said, I'm sure you could devise a way to put your backup
functions in another shared library that is searched after libc.so.6
That's dead easy.  Deeper nesting of shared libraries is a little more
difficult, due to breadth first library search, but still possible for
any given depth of libraries.  I imagine this case would be rare
anyway.

Who really is pushing for STB_SECONDARY?  Is it some hide-bound
company that uses a non-ELF toolchain and doesn't want to adapt any
process of theirs?

-- 
Alan Modra
Australia Development Lab, IBM