[Bug libc/30306] New: ld.so.conf could easily / should support binary specific LD_PATH directory search path settings ?

["jason.vas.dias at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30306

            Bug ID: 30306
           Summary: ld.so.conf could easily / should support binary
                    specific LD_PATH directory search path settings ?
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: jason.vas.dias at gmail dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

I am considering developing a patch to ld.so's ld.so.conf handling 
that , as well as supporting DIRECTORY lists to add to the effective
LD_PATH ($LD_LIBRARY_PATH), could easily also support a new syntax like:

/usr/bin/perf:+/usr/local/lib64

to create an EXCEPTION for the /usr/bin/perf program,
so that for the specific binary file /usr/bin/perf,  
/usr/local/lib64 would be added to the 
"effective $LD_LIBRARY_PATH" := LD_PATH 
(my shorthand).

Perhaps an alternative on platforms which support filesystems
with extended attributes would be to support files having
a 'LD_SO_PATH:' Extended Attribute, which ld.so could support
with some new

/${DIRECTORY}/:EA_LD_SO_PATH:true

setting to enable EA LD_SO_PATH checking for all files under 
${DIRECTORY} .

This is to solve this problem:
 https://bugzilla.redhat.com/show_bug.cgi?id=2183758
where the linux kernel 'perf' package from v6.2.8 cannot build
without the libbpf 0.8.0+ packages, but only v0.7.0 packages
come with FC36, so I need to build libbpf-1.1.0-2 into /usr/local/,
so it installs its libraries into /usr/local/lib64, then I DO build
perf with the ld / gcc '-R /usr/local/lib64' option, but this is 
conscientiously stripped out of LDFLAGS / from resultant binaries,
I don't want to have to patch the binary, so I have to replace
/usr/bin/perf with a script : 
'
!#/bin/bash
exec /usr/bin/perf.bin "$@"
', which is not ideal.

I think ld.so could provide a most elegant, simple & efficient
solution to this problem with support for a tiny extra bit of new
configuration syntax - I'd like my ld.so to provide this!

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