如何在yocto上移植grpc helloworld（CPP）示例

Question

Hey i am trying to port the helloworld, cpp based demo for gRPC on yocto pyro on Ubuntu 16.04 LTS for target arm, . But i am getting the error.

protoc -I ./ --grpc_out=. --plugin=protoc-gen-grpc=/home/admin/BUILD/tmp/sysroots-components/x86_64/grpc-native/usr/bin/grpc_cpp_plugin hello.proto

/home/admin/BUILD/tmp/sysroots-components/x86_64/grpc-native /usr/bin/grpc_cpp_plugin: error while loading shared libraries:libprotoc.so.15: cannot open shared object file: No such file or directory

--grpc_out: protoc-gen-grpc: Plugin failed with status code 127.

Makefile:55: recipe for target 'hello.grpc.pb.cc' faile

So can anyone suggest the steps to solve this error.

Please find the helloworld.bb file.

DESCRIPTION = "Hello world"  
SECTION = "Hello world"  
LICENSE = "CLOSED"  

S = "${COREBASE}/../../../src_dir/hello"  
B = "${S}"  

inherit externalsrc  
EXTERNALSRC_pn-hello = "${S}"  
EXTERNALSRC_BUILD_pn-hello = "${B}"  
EXTERNALSRC_SYMLINKS_pn-hello = ""  

DEPENDS = "grpc-native protobuf-native protobuf-c gflags c-ares protobuf-c-native openssl"  

PR = "r1"  

PARALLEL_MAKE =""  

TARGET_CXX_ARCH += "${LDFLAGS}"  


do_compile() {  
 oe_runmake  
}  


ALLOW_EMPTY_${PN} = "1"  
FILES_${PN} = "/*"  

Please find the makefile for it.

CXX = arm-poky-linux-gnueabi-g++  -march=armv7-a -mfpu=neon  -mfloat-abi=hard -mcpu=cortex-a8 -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed --sysroot=/home/admin/BUILD/tmp/work/cortexa8hf-neon-poky-linux-gnueabi/hello-demo/0.1.0-r1/recipe-sysroot


CXXFLAGS += -std=c++11
ifeq ($(SYSTEM),Darwin)
LDFLAGS += -L/usr/local/lib  `pkg-config --libs protobuf grpc++ grpc`\
       -ldl
else
LDFLAGS +=  -L/home/admin/BUILD/tmp/work/cortexa8hf-neon-poky-linux-gnueabi/hello-demo/0.1.0-r1/recipe-sysroot/usr/lib -Wl,--no-as-needed -lgrpc++_reflection -Wl,--as-needed\
       -ldl

endif
PROTOC = protoc
GRPC_CPP_PLUGIN = grpc_cpp_plugin
GRPC_CPP_PLUGIN_PATH ?= /home/admin/BUILD/tmp/sysroots-components/x86_64/grpc-native/usr/bin/grpc_cpp_plugin

PROTOS_PATH = ./

vpath %.proto $(PROTOS_PATH)

all: hello_client hello_server

hello_client: hello.pb.o hello.grpc.pb.o hello-client.o
    $(CXX) $^ $(LDFLAGS) -o $@


hello_server: hello.pb.o hello.grpc.pb.o hello-server.o
    $(CXX) $^ $(LDFLAGS) -o $@


.PRECIOUS: %.grpc.pb.cc
%.grpc.pb.cc: %.proto
    $(PROTOC) -I $(PROTOS_PATH) --grpc_out=. --plugin=protoc-gen-  grpc=$(GRPC_CPP_PLUGIN_PATH) $<

.PRECIOUS: %.pb.cc
%.pb.cc: %.proto
    $(PROTOC) -I $(PROTOS_PATH) --cpp_out=. $<

clean:
    rm -f *.o *.pb.cc *.pb.h hello_client hello_server

Please find the my grpc_1.8.5.bb file.

Answer 1

I think it has nothing to do with the gRPC example, looks like there is an issue with protoc installation script on Linux - it doesn't update dynamic libraries bindings. Try to run "ldconfig" from root. And run "protoc" after it, without any arguments.