grpc_out: protoc-gen-grpc: Plugin failed with status code 1

I have cross compiled gRPC (v1.27.3) for QNX 7 (ARM) platform. I am using the protobuf which was already available for our system (QNX ARM v3.11.4).

I used following cmake command to build gRPC for compilation process

cmake -DCMAKE_CROSSCOMPILING=1 -DgRPC_BUILD_TESTS=OFF -DgRPC_PROTOBUF_PROVIDER=package -DgRPC_SSL_PROVIDER=package -DgRPC_ZLIB_PROVIDER=package -DOPENSSL_CRYPTO_LIBRARY=$QNX_TARGET/aarch64le/usr/lib/libcrypto.a -DOPENSSL_SSL_LIBRARY=$TARGET/aarch64le/usr/lib/libssl.a -DCMAKE_BUILD_TYPE=Release -DCMAKE_TOOLCHAIN_FILE=/tmp/qnxarm/toolchain.cmake -DCMAKE_INSTALL_PREFIX=/tmp/qnxarm/inst ../..

make plugins

make -j4 

sudo make install

After compiling, I am able to see the binaries in /tmp/qnxarm/inst folder.

I copied those binaries in our code to compile the application for QNX.

While compiling I am getting this issue:

<local_directory>/grpc/aarch64/qnx/bin/grpc_cpp_plugin: program not found or is not executable
Please specify a program using absolute path or make sure the program is available in your PATH system variable
--grpc_out: protoc-gen-grpc: Plugin failed with status code 1.
lib/qmonitor/proto/CMakeFiles/QMonitorProto.dir/build.make:105: recipe for target 'lib/qmonitor/proto/QAicMonitorInternal.grpc.pb.cc' failed
make[2]: *** [lib/qmonitor/proto/QAicMonitorInternal.grpc.pb.cc] Error 1

Please help me to know what is wrong? or what should be done to solve this.

Do we need to add the PATH in gRPCTargets.cmake file which is generated in lib folder?

Solution

You've compiled the gRPC tools for your QNX ARM system -- so the version of grpc_cpp_plugin you made is expecting to be run on your QNX system, not your build host.

The usual approach for this sort of thing is to make a second copy of gRPC compiled for your build host, and then instruct your application build to link the libraries from the cross build, but call the grpc_cpp_plugin compiled for the build host.