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Build VA dependencies for Linux

Last edited by Jonathan Ehret

How to build VA binaries for the Plugin

This is a short HowTo for updating the Linux VA binaries (i.e., libVABase.so and libVANet.so).

❗ You first need to build Vista (VistaBase, VistaAspects and VistaInterProcComm is needed) accordingly to the guide below.

  • Create a folder on Linux filesystem (e.g. VA_build)
  • Clone/copy the CMakeList.txt of VA into it.
  • Copy/clone VANet and VABase in the appropriate versions to this folder (e.g., both at tag v2020.a) * best use clang, so e.g. do module load clang (and potentially module unload gcc before)
  • To not have .so and .so.1.0.0 and .so.1 files, edit VABase/CMakeLists.txt and VANet/CMakeLists.txt and add set_target_properties(VABase PROPERTIES NO_SONAME 1) and set_target_properties(VANet PROPERTIES NO_SONAME 1) respectively
  • mkdir build
  • cd build
  • ccmake ..
  • hit c for configure (ignore errors for now)
  • deactivate ITA_VA_WITH_BINDING_CS
  • toogle to advanced with t and then add to CMAKE_CXX_FLAGS: -std=c++11 -nostdinc++ -I "/home/av006de/Unreal/UnrealEngine_4_26/Engine/Source/ThirdParty/Linux/LibCxx/include/c++/v1/" ODER DOCH -static-libstdc++ (or the respective Unreal Version you are building for). This way it links against the standard runtime library shipped with Unreal.
  • hit g for generate
  • make -j
  • Now in the build/lib folder the libraries can be found, copy those to unreal-va-plugin\Source\VALibrary\lib.

You will have to set the ViSTA build tools to be setup correctly:

  • clone VistaCMakeCommon
  • export VISTA_CMAKE_COMMON=[path to cloned VistaCMakeCommon]
  • also clone ViSTA and build it, of it VistaBase, VistaAspects and VistaInterProcComm is needed.

Troubleshoots:

  • If some auto```constructs generate compiler warnings: add -std=c++11toCMAKE_CXX_FLAGS``
  • If string symbols are undefined, link against Unreal's stdlib: add -nostdinc++ -I "/home/av006de/Unreal/UnrealEngine_4_26/Engine/Source/ThirdParty/Linux/LibCxx/include/c++/v1/" to CMAKE_CXX_FLAGS
  • If libstdc++.so cannot be loaded at cooking: add -static-libstdc++ to CMAKE_CXX_FLAGS
  • If dlopen failed: ../lib/libVABase.so occurs you need to:
    • Check with readelf -d libVANet.so | grep NEEDED whether libVABase.so is not linked directly into libVANet.so but as ../lib/libVABase.so which cannot be found for packaged builds.
    • To change that on Windows, e.g., get https://github.com/david942j/patchelf.rb for Ruby
    • patchelf --replace-needed "../lib/libVABase.so","libVABase.so" libVANet.so

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