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

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

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=341657bc9c17d3ea4546c6d998e67ca349a78e80

commit 341657bc9c17d3ea4546c6d998e67ca349a78e80
Author: Florian Weimer <fweimer@redhat.com>
Date:   Sat Dec 10 21:16:57 2016 +0100

    debug: Additional compiler barriers for backtrace tests [BZ #20956]

    The new test framework changed the call stacks.  The weak attribute
    acts as a strong compiler barrier.  Some static functions had to be
    declared extern as a consequence.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog              |   14 ++++++++++++++
 debug/tst-backtrace.h  |    2 +-
 debug/tst-backtrace2.c |   10 ++++------
 debug/tst-backtrace3.c |    8 +++-----
 debug/tst-backtrace4.c |    8 +++-----
 debug/tst-backtrace5.c |    8 +++-----
 6 files changed, 28 insertions(+), 22 deletions(-)

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