Toolchain file seems to need to be passed in twice in cmake?

[erwei-xilinx]

With docker image containers.xilinx.com/acdc/build:2.0 the current util build script, targetting x86, fails with

CMake Error at utils/llvm/build/lib/cmake/llvm/HandleLLVMOptions.cmake:320 (message):
  Host compiler does not support '-fuse-ld=lld'
Call Stack (most recent call first):
  CMakeLists.txt:73 (include)

It seems that this issue can be solved by passing in the toolchain file twice into the cmake:

    -DCMAKE_TOOLCHAIN_FILE=`pwd`/../cmake/modules/toolchain_x86_64.cmake \
    -Dx86_64_TOOLCHAIN_FILE=`pwd`/../cmake/modules/toolchain_x86_64.cmake \