Re: [PATCH] powerpc: Use FLAG_ELF_LIBC6 for 32-bit known libraries

[Raoni Fassina Firmino <raoni@linux.ibm.com>]

On Fri, Dec 03, 2021 at 11:51:29AM -0300, AL glibc-alpha wrote:
> 
> 
> On 04/11/2021 15:10, Lucas A. M. Magalhaes via Libc-alpha wrote:
> > In systems with more versions of the known libraries, i.e. on IBM
> > Advance Toolchain, ldconfig will order them incorrectly on ld.cache.
> > 
> > The issue only occurs with 32-bit libraries that don't depend on libc or
> > libm. That's because process_elf32_file check if the elf depends on one
> > of the libraries at known_libs to select the elf flag. For example, as
> > libc.so.6 don't depend on itself or on libm it will be flagged as
> > FLAG_ELF instead of FLAG_ELF_LIBC6 as expected.
> 
> Wouldn't be simpler to check if the DT_SONAME matches any on 'known_libs' after
> dynamic section parsing and set the appropriated flag on generic 'process_file'? 

But then it would touch every architecture, I think since this is only a
problem affecting powerpc (BE 32bits) I don't think it is worth touch
the generic code if will not help any other architecture.


> (also powerpc SYSDEP_KNOWN_LIBRARY_NAMES seems redundant).

Seems to be the same as every other arch except i386. Lookin at Lucas's
RFC for removal of libc.5 and libc.4 compatibility, maybe it being
diferent in i386 is just that it was never really used anymore, and so
never updated.


o/
Raoni