[tor-bugs] #29550 [Core Tor/Tor]: Tor nightly fails to build for Windows

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#29550: Tor nightly fails to build for Windows
------------------------------+--------------------
     Reporter:  boklm         |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
------------------------------+--------------------
 Since 2019-02-15, tor fails to build for Windows inside the Tor Browser
 nightly builds.

 It fails with this error:
 {{{
   CCLD     src/tools/tor-gencert.exe
   CCLD     src/test/test-switch-id.exe
   CCLD     src/test/test-timers.exe
   CCLD     src/test/test-bt-cl.exe
   CCLD     src/test/test-rng.exe
   CCLD     src/test/fuzz/fuzz-consensus.exe
   CCLD     src/test/fuzz/fuzz-descriptor.exe
   CCLD     src/test/fuzz/fuzz-diff.exe
   CCLD     src/test/fuzz/fuzz-diff-apply.exe
   CCLD     src/test/fuzz/fuzz-extrainfo.exe
   CCLD     src/test/fuzz/fuzz-hsdescv2.exe
   CCLD     src/test/fuzz/fuzz-hsdescv3.exe
   CCLD     src/test/fuzz/fuzz-http.exe
   CCLD     src/test/fuzz/fuzz-http-connect.exe
   CCLD     src/test/fuzz/fuzz-iptsv2.exe
   CCLD     src/test/fuzz/fuzz-microdesc.exe
   CCLD     src/test/fuzz/fuzz-socks.exe
   CCLD     src/test/fuzz/fuzz-strops.exe
   CCLD     src/test/fuzz/fuzz-vrs.exe
   CCLD     src/app/tor.exe
   CCLD     src/tools/tor-resolve.exe
   CCLD     src/tools/tor-print-ed-signing-cert.exe
   CCLD     src/test/bench.exe
   CCLD     src/test/test.exe
   CCLD     src/test/test-slow.exe
 /var/tmp/dist/mingw-w64/lib/gcc/i686-w64-mingw32/6.4.0/../../../../i686-w64-mingw32/bin/ld:
 cannot find -lz
 collect2: error: ld returned 1 exit status
 make[1]: *** [src/test/test-slow.exe] Error 1
 Makefile:8673: recipe for target 'src/test/test-slow.exe' failed
 make[1]: *** Waiting for unfinished jobs....
 make[1]: Leaving directory '/var/tmp/build/tor-59c3910becd9'
 Makefile:5290: recipe for target 'all' failed
 make: *** [all] Error 2
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29550>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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