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Building from source on Windows

Unfortunately, building node-webrtc from source on Windows is a bit trickier than on Linux or MacOS, because there is not a reproducible build environment. Also because libwebrtc itself seems a bit broken on this platform.

Things you should do before building

These are things I had to do to get npm run build working on Windows. If you miss a step, the build might fail.

CMake setup

  • Add the Visual Studio Clang directory to your %PATH%. The directory is C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\Llvm\x64\bin\.
  • Add the Windows SDK installation directory to your %PATH%. An example would be C:\Program Files (x86)\Windows Kits\10\bin\10.0.22621.0\x64.
  • Modify C:\Program Files\CMake\share\cmake-3.26\Modules\Windows-Clang.cmake to not have -fuse-ld=lld-link.
  • Modify node_modules/cmake-js/lib/toolset.js, line 184, to have the flag -DELAYLOAD:NODE.EXE instead of /DELAYLOAD:NODE.EXE.
  • Set the environment variables CC=clang.exe and CXX=clang++.exe.

Source code modifications

  • In build-win32-x64/external/libwebrtc/download/src:
    • In third_party/abseil-cpp/absl/meta/type_traits.h, lines 482 and 493, comment out the assertions that trigger for the "std::pair is not trivially constructible" error.
    • In rtc_base/third_party/sigslot/sigslot.h, line 295, make pmethod always be an array size 24.
  • In build-win32-x64/external/catch2/src:
    • In single_include/catch2/catch.hpp, line 8722, modify this to always be 32768.

Things to do for a debug build

You'll need to set the environment variable DEBUG=1 if you want symbols. On PowerShell, this can be done with $env:DEBUG=1. Note that CMake will build these into the same directory, which is a bit annoying. TODO come up with a better way to switch between debug/release builds.