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[tor-bugs] #21954 [Obfuscation/Snowflake]: Snowflake breaks the 7.0a3 build



#21954: Snowflake breaks the 7.0a3 build
---------------------------------------+---------------------
     Reporter:  gk                     |      Owner:  arlolra
         Type:  defect                 |     Status:  new
     Priority:  Immediate              |  Milestone:
    Component:  Obfuscation/Snowflake  |    Version:
     Severity:  Blocker                |   Keywords:
Actual Points:                         |  Parent ID:
       Points:                         |   Reviewer:
      Sponsor:                         |
---------------------------------------+---------------------
 Building Snowflake breaks our 7.0a3 build with the following error:
 {{{
 + mkdir -p /home/debian/go/src/github.com/keroserene/
 + ln -sf /home/debian/build/go-webrtc
 /home/debian/go/src/github.com/keroserene/go-webrtc
 + CGO_CXXFLAGS='-D_GLIBCXX_USE_CXX11_ABI=1 -D__STDC_FORMAT_MACROS=1'
 + CGO_LDFLAGS=-latomic
 + go install github.com/keroserene/go-webrtc
 # github.com/keroserene/go-webrtc
 <command-line>:0:0: warning: "_GLIBCXX_USE_CXX11_ABI" redefined
 <command-line>:0:0: note: this is the location of the previous definition
 # github.com/keroserene/go-webrtc
 <command-line>:0:0: warning: "_GLIBCXX_USE_CXX11_ABI" redefined
 <command-line>:0:0: note: this is the location of the previous definition
 # github.com/keroserene/go-webrtc
 <command-line>:0:0: warning: "_GLIBCXX_USE_CXX11_ABI" redefined
 <command-line>:0:0: note: this is the location of the previous definition
 # github.com/keroserene/go-webrtc
 /home/debian/install/binutils/bin/ld.gold.real: error:
 ../../go/src/github.com/keroserene/go-webrtc/lib/libwebrtc-
 linux-386-magic.a(dump_syms_regtest.o): unsupported ELF file type 2
 collect2: error: ld returned 1 exit status
 }}}

 I double-checked that the commits I am on are the same as in the patch for
 #21748. Furthermore, I made a `make clean-webrtc` and the build started
 with `tbb-7.0a3-build3`.

 There are actually two issues here:

 1) We need to unblock the 7.0a3 build as soon as possible as we want to
 release the first ESR52-based Tor Browser alpha next week

 2) I'd like to understand how this can happen at all given that we did not
 change the commits compared to the fix in #21748 and I tested that the
 building worked back then. I somehow doubt that arlolra and I made the
 same mistake (by using the wrong commit or something).

 I need to have a fix for that within the next 24 hours, otherwise do I
 need to disable Snowflake in the alphas.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21954>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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