message: Add openmp llvm project to linux builds
diff: @@ -241,6 +241,10 @@ def build_LLVM(version_LLVM, folder, tarball, debug, selfbuild, extra, from_vali
  # otherwise a build error will occure (attempt to use just built libcxxabi, which was not built).
  # An option to build seems to be a better one.
  llvm_enable_projects +=";libcxx;libcxxabi"
  + if current_OS == "Linux":
  + # OpenMP is needed for GEN enabled builds.
  + # Starting from Ubuntu 20.04 libomp-dev package doesn't install omp.h to default location.
  + llvm_enable_projects +=";openmp"
  if extra == True:
  llvm_enable_projects +=";compiler-rt;clang-tools-extra"
  else:
  