[Bug testsuite/33541] New: [gdb/testsuite] Introduce require have_prelink_support

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=33541

            Bug ID: 33541
           Summary: [gdb/testsuite] Introduce require have_prelink_support
           Product: gdb
           Version: unknown
            Status: NEW
          Severity: normal
          Priority: P2
         Component: testsuite
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

I build gdb on ubuntu 24.04.3, and ran the testsuite.

I ran into a few failures, all prelink-related AFAICT:
...
$ ./sum.sh
      1 gdb.base/attach-pie-misread.exp:
    159 gdb.base/break-interp.exp:
      1 gdb.base/prelink.exp:
...

The first in more detail:
...
Command is exec /usr/sbin/prelink -qNR --no-exec-shield
--dynamic-linker=/home/vries/gdb/build/gdb/testsuite/outputs/gdb.base/attach-pie-misread/attach-pie-misread.d/ld-linux-x86-64.so.2
--ld-library-path=/home/vries/gdb/build/gdb/testsuite/outputs/gdb.base/attach-pie-misread/attach-pie-misread.d
/home/vries/gdb/build/gdb/testsuite/outputs/gdb.base/attach-pie-misread/attach-pie-misread
/home/vries/gdb/build/gdb/testsuite/outputs/gdb.base/attach-pie-misread/attach-pie-misread.d/libc.so.6
/home/vries/gdb/build/gdb/testsuite/outputs/gdb.base/attach-pie-misread/attach-pie-misread.d/ld-linux-x86-64.so.2
result is 1
output is prelink:
/home/vries/gdb/build/gdb/testsuite/outputs/gdb.base/attach-pie-misread/attach-pie-misread:
Could not parse `        linux-vdso.so.1 (0x00007e913ae7f000)'
FAIL: gdb.base/attach-pie-misread.exp: prelink ld-linux-x86-64.so.2
...

I went to read a bit about prelink, and found out that after installing
prelink, there's some setup to do, like setting PRELINKING=yes in
/etc/default/prelink.

I have not done such a setup, so perhaps these tests fail because of an
incomplete setup.

If so, there should be some have_prelink_support proc (to be used with require
in those test-cases), that does something more than just make sure that the
prelink binary is present.

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