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Re: [tor-bugs] #25483 [Obfuscation/Snowflake]: Windows reproducible build of snowflake
#25483: Windows reproducible build of snowflake
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Reporter: arlolra | Owner: sukhbir
Type: project | Status: assigned
Priority: High | Milestone:
Component: Obfuscation/Snowflake | Version:
Severity: Normal | Resolution:
Keywords: TorBrowserTeam201805 | Actual Points:
Parent ID: #19001 | Points:
Reviewer: | Sponsor:
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Comment (by cmm323):
Cross compiling WebRTC library for Windows on a Linux machine and linking
Snowflake involves multiple steps:
1-Cross compiling WebRTC lib: This step is currently done using Clang,
which is Microsoft Visual C++ (MSVC) compatible[1].
2-Cross compiling Snowflake code: This step is currently done using MingW
because Cgo (which integrates Golang with C) does not support Clang for
Windows[2].
3-Linking Snowflake binary against WebRTC lib: This part is problematic.
First, Cgo currently doesn't support MSVC object files [3] and MingW and
Clang/MSVC object files are not compatible[4]. An attempt to link these
two using MingW leads to compiler errors `undefined reference to`
mentioned in[comment:29].
[1]- https://clang.llvm.org/docs/MSVCCompatibility.html
[2]- https://github.com/golang/go/issues/17014
[3]- https://github.com/golang/go/issues/20982
[4]- http://www.mingw.org/wiki/MixingCompilers
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25483#comment:38>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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