[Bug testsuite/30637] New: compare-sections.exp fails due to unfulfilled sections mismatch

["marcel at codesourcery dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30637

            Bug ID: 30637
           Summary: compare-sections.exp fails due to unfulfilled sections
                    mismatch
           Product: gdb
           Version: 12.1
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: testsuite
          Assignee: unassigned at sourceware dot org
          Reporter: marcel at codesourcery dot com
  Target Milestone: ---

Hi,

testing GDB 12 (and 13) on Nios II ELF, I recognized the following test fail:

   FAIL: gdb.base/compare-sections.exp: after run to main: compare-sections

... which results from the test case 

   gdb_test "compare-sections" \
        "MIS-MATCHED.*warning.*One or more sections.*does not match.*loaded
file"

in 'with_test_prefix "after run to main"' in compare-sections.exp.

If my understanding is correct, then it is expected that at least one section
of the image on the target differs from the corresponding section on the host
after running to main. Debugging the test binary manually I found that all
sections match and I wondered if the test assumption (the mismatch) is indeed
valid for non-PIE targets (when "is_pie" is false). Maybe "compare-sections"
should rather be handled like "compare-sections -r" which checks the match vs.
mismatch depending on is_pie (added in commit 34dafe9f39e)?

If my understanding is correct, then the attached patch seems to fix it.

Marcel

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