[tor-bugs] #28205 [Obfuscation/Snowflake]: linking against other libwebrtc binaries errors out on missing symbols

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#28205: linking against other libwebrtc binaries errors out on missing symbols
-----------------------------------+---------------------------
 Reporter:  eighthave              |          Owner:  eighthave
     Type:  defect                 |         Status:  accepted
 Priority:  Medium                 |      Milestone:
Component:  Obfuscation/Snowflake  |        Version:
 Severity:  Major                  |     Resolution:
 Keywords:  android                |  Actual Points:
Parent ID:                         |         Points:
 Reviewer:                         |        Sponsor:
-----------------------------------+---------------------------

Comment (by dcf):

 I'll bet those missing symbols are caused by an ABI mismatch. Notice how
 all of them include `std::string` in the method signature. Chances are,
 the library you built uses `std::__cxx11::basic_string` instead of
 `std::string`. You can check with `nm --demangle libwebrtc.a | grep
 CreateIceCandidate`.

 The fix may be to add `-D_GLIBCXX_USE_CXX11_ABI=1` to `CGO_CXXFLAGS` when
 building snowflake. For example, see comment:14:ticket:27827.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28205#comment:9>
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