[tor-bugs] #17151 [Tor]: FreeBSD: fix test_bt failures

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#17151: FreeBSD: fix test_bt failures
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     Reporter:  saper   |      Owner:
         Type:  defect  |     Status:  new
     Priority:  normal  |  Milestone:  Tor: 0.2.???
    Component:  Tor     |    Version:  Tor: 0.2.7.2-alpha
   Resolution:          |   Keywords:  build
Actual Points:          |  Parent ID:
       Points:          |
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Comment (by saper):

 While it it easy to add

 {{{
 AC_SEARCH_LIBS(backtrace, [execinfo])
 }}}

 to configure.ac, the tests still do not pass - the reason is probably
 compiler optimization
 (tried with gcc5, clang3.4.1)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17151#comment:1>
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