build failed if all plugins are disabled

[leleliu008]

What version of gRPC and what language are you using?

https://github.com/grpc/grpc/archive/refs/tags/v1.62.2.tar.gz

What operating system (Linux, Windows,...) and version?

Android

What runtime / compiler are you using (e.g. python version or version of gcc)

Android NDK r26d (clang version 17.0.2)

What did you do?

cmake \
        -DCMAKE_CXX_STANDARD=17 \
        -DCMAKE_CXX_STANDARD_REQUIRED=TRUE \
        -DgRPC_ABSL_PROVIDER=package \
        -DgRPC_CARES_PROVIDER=package \
        -DgRPC_PROTOBUF_PROVIDER=package \
        -DgRPC_SSL_PROVIDER=package \
        -DgRPC_ZLIB_PROVIDER=package \
        -DgRPC_RE2_PROVIDER=package \
        -DgRPC_INSTALL=ON \
        -DgRPC_BUILD_TESTS=OFF \
        -DgRPC_BUILD_GRPC_CPP_PLUGIN=OFF \
        -DgRPC_BUILD_GRPC_PHP_PLUGIN=OFF \
        -DgRPC_BUILD_GRPC_NODE_PLUGIN=OFF \
        -DgRPC_BUILD_GRPC_RUBY_PLUGIN=OFF \
        -DgRPC_BUILD_GRPC_PYTHON_PLUGIN=OFF \
        -DgRPC_BUILD_GRPC_CSHARP_PLUGIN=OFF \
        -DgRPC_BUILD_GRPC_OBJECTIVE_C_PLUGIN=OFF \
        -DBUILD_SHARED_LIBS=OFF

I only need libraries, so I disabled all plugins.

What did you expect to see?

successfully built

What did you see instead?

-- CMake command: /home/leleliu008/.ndk-pkg/uppm/installed/cmake/bin/cmake
-- CMake version: 3.29.1
-- CMAKE_HOST_SYSTEM_NAME: Linux
--      CMAKE_SYSTEM_NAME: Android
-- CMake command: /home/leleliu008/.ndk-pkg/uppm/installed/cmake/bin/cmake
-- CMake version: 3.29.1
-- CMAKE_HOST_SYSTEM_NAME: Linux
--      CMAKE_SYSTEM_NAME: Android
-- The C compiler identification is Clang 17.0.2
-- The CXX compiler identification is Clang 17.0.2
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /home/leleliu008/.ndk-pkg/core/wrapper-target-cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /home/leleliu008/.ndk-pkg/core/wrapper-target-c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed
-- Check if compiler accepts -pthread
-- Check if compiler accepts -pthread - yes
-- Found Threads: TRUE
-- Performing Test HAVE_STDC_FORMAT_MACROS
-- Performing Test HAVE_STDC_FORMAT_MACROS - Success
-- Found c-ares: /home/leleliu008/.ndk-pkg/installed/android-21-arm64-v8a/c-ares/lib/cmake/c-ares/c-ares-config.cmake (found suitable version "1.28.1", minimum required is "1.13.0")
-- Found ZLIB: /home/leleliu008/.ndk-pkg/installed/android-21-arm64-v8a/libz/lib/libz.so (found version "1.3.1")
-- Found RE2 via CMake.
-- Found OpenSSL: /home/leleliu008/.ndk-pkg/installed/android-21-arm64-v8a/openssl-dev/lib/libcrypto.so (found version "3.3.0")
-- Downloading from https://storage.googleapis.com/grpc-bazel-mirror/github.com/census-instrumentation/opencensus-proto/archive/v0.3.0.tar.gz, if failed, please try configuring again
-- Configuring done (4.4s)
CMake Error: INSTALL(EXPORT) given unknown export "gRPCPluginTargets"
-- Generating done (0.2s)
CMake Warning:
  Manually-specified variables were not used by the project:

    BUILD_TESTING
    CMAKE_COLOR_MAKEFILE
    CMAKE_INSTALL_LIBDIR


CMake Generate step failed.  Build files cannot be regenerated correctly.

Anything else we should know about your project / environment?

[yashykt]

I think if you disable gRPC_BUILD_CODEGEN as well, that would make it work.

[yashykt]

but we could probably add logic to say - if no plugin is enabled, don't do anything with gRPC_BUILD_CODEGEN

[yashykt]

Feel free to send a PR.

[yashykt]

This is not a very common usecase so I wouldn't be surprised if there are other issues that crop up when doing this.

[leleliu008]

@yashykt Thank you for your reply.