[Bug default/24277] New: dwz needs testsuite

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=24277

            Bug ID: 24277
           Summary: dwz needs testsuite
           Product: dwz
           Version: unspecified
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: default
          Assignee: nobody at sourceware dot org
          Reporter: vries at gcc dot gnu.org
                CC: dwz at sourceware dot org
  Target Milestone: ---

With dwz bugs like:
- PR24274 "low-mem files processed in multifile mode"
- PR24275 "hardlink handling leaves temporary file if not file compressed" 
it becomes clear that we need a dwz testsuite, to:
- be able to add tests to patches fixing those PRs to verify that they're fixed
- check that patches fixing those PRs don't break other behaviour

The gdb testsuite contains two dwz test modes in conjunction with
target_board=cc-with-tweaks:
- CC_WITH_TWEAKS_FLAGS='-z' (regular dwz)
- CC_WITH_TWEAKS_FLAGS='-m' ()
but that tests just the dwarf output, and uses dwz in a limited amount of ways.

It's debatable whether we want to add (possibly large) executables to the
testsuite to test assert fixes which are typically not triggered with hello
world type examples.

But adding hello world type examples should be possible, and for that we need
some testsuite infrastructure.

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