Prebuilding grpc and find_package

问题

I'd like to link my application with a prebuilt gRPC 1.30.

The directory structure that I want:

- project root
  - external
    + gRPC
  - src
    ... my source code here ...

I've built gRPC:

git clone --recurse-submodules -b v1.30.0 https://github.com/grpc/grpc
cmake -DgRPC_INSTALL=ON -DgRPC_BUILD_TESTS=OFF -DCMAKE_INSTALL_PREFIX="D:/grpc" -A x64 ..
cmake --build . --target install --config Release

The final structure of files produced in D:/grpc is weird... the topmost cmake folder contains protobuf-config.cmake and the grpc's one is in D:/grpc/lib/cmake/grpc. But I don't really care as long as it works.

This is in my project's CMakeLists.txt.

set(CMAKE_PREFIX_PATH ${EXTERNAL_DIRECTORY}
    ${EXTERNAL_DIRECTORY}/grpc/ 
    ${EXTERNAL_DIRECTORY}/grpc/cmake/ 
    ${CMAKE_PREFIX_PATH})

find_package(Protobuf CONFIG REQUIRED)
find_package(gRPC CONFIG REQUIRED)

add_executable(test main.cpp)
target_link_libraries(test PRIVATE grpc::grpc++)

And finally, this is the error that I'm getting when I try to build it:

  Target "test" links to target "Threads::Threads" but the target was
  not found.  Perhaps a find_package() call is missing for an IMPORTED
  target, or an ALIAS target is missing?

I'm stuck here.

回答1:

I simply added:

find_package(Threads REQUIRED)

来源：https://stackoverflow.com/questions/62562627/prebuilding-grpc-and-find-package