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[Bug libc/20956] New: debug/tst-backtrace3-6 don't work with -O3 anymore


https://sourceware.org/bugzilla/show_bug.cgi?id=20956

            Bug ID: 20956
           Summary: debug/tst-backtrace3-6 don't work with -O3 anymore
           Product: glibc
           Version: 2.26
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: markus at trippelsdorf dot de
                CC: drepper.fsp at gmail dot com, fweimer at redhat dot com
  Target Milestone: ---

Since:

commit c23de0aacbeaa7a091609b35764bed931475a16d
Author: Florian Weimer <fweimer@redhat.com>
Date:   Fri Dec 9 08:18:27 2016 +0100

    support: Introduce new subdirectory for test infrastructure

I get when building with -O3:

FAIL: debug/tst-backtrace3                                                     
                                                                               
                   FAIL: debug/tst-backtrace4                                  
                                                                               
                                      FAIL: debug/tst-backtrace5               
                                                                               
                                                         FAIL:
debug/tst-backtrace6 

Before:
markus@x4 debug % ./tst-backtrace3
Obtained backtrace with 4 functions
Function 0: ./tst-backtrace3(fn+0x1f) [0x4019df]
Function 1: ./tst-backtrace3(fn+0xf8) [0x401ab8]
Function 2: ./tst-backtrace3(fn+0xf8) [0x401ab8]
Function 3: ./tst-backtrace3() [0x401afe]

After:
markus@x4 debug % ./tst-backtrace3
Obtained backtrace with 4 functions
Function 0: ./tst-backtrace3(fn+0x1f) [0x40136f]
Function 1: ./tst-backtrace3(fn+0xf8) [0x401448]
Function 2: ./tst-backtrace3() [0x40148e]
Function 3: ./tst-backtrace3() [0x4014a9]
Failure on line 70

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