litert_external_litert_buffer_context.cc not included in CMakeLists.txt

[nuclearczy]

litert/c/CMakeLists.txt seems to exclude litert/c/internal/litert_external_litert_buffer_context.cc
which is needed by runtime when using GPU backend on ARM Android phones, it seems to fix the issue when adding "internal/litert_external_litert_buffer_context.cc" to CMakeLists.txt, is there a specific reason to exclude this source file?

[sourcelite]

Hi @nuclearczy, you're right, this is a GPU runtime failure, I predict there is a sync gap in our Bazel and CMake build system. (but I need to look more..)

root cause details:
"litert/c/internal/litert_external_litert_buffer_context.cc" has implementation for "LiteRtExternalBufferContext"
importance: this allowed liteRT runtime to manage external hardware buffers for zero copy GPU inference, without it the other NPU/GPU delegates will not work properly in share memory with runtime, it will go to some errors and also some symbol errors.

I will check this more on my side and update you. and big thanks for confirming that adding file will fix the issue on your ARM android build.