Google Assistant SDK在api/auth.pb.cc中出现"cannot cast“编译错误

Question

我尝试编译grpc Google Assistant SDK的新v1alpha2。

为此，我在Google Assistant git存储库中运行make (使用cpp语言输出)，其中生成了我的*.pb.cc和*.ob.h文件。然后我尝试将/google/api，/google/type *.pb.cc文件编译成.o文件，我可以链接到我的基本项目中。( embedded_assistant.proto有两个导入语句：import "google/api/annotations.proto"; import "google/type/latlng.proto";)。

我也尝试过用/google/protobuf和/google/rpc编译它。

它是由一个makefile自动执行的，在这个命令中，我得到了以下错误：

make generated command:
g++ -c -I/usr/local/include -pthread -I./googleapis/gens -I./grpc  -std=c++11 googleapis/gens/google/api/auth.pb.cc -o googleapis/gens/google/api/auth.pb.o

output:
googleapis/gens/google/api/auth.pb.cc:552:23: error: cannot cast '::google::protobuf::RepeatedPtrField< ::google::api::AuthenticationRule>' to its private base class
    'google::protobuf::internal::RepeatedPtrFieldBase'
rules_.InternalSwap(&other->rules_);
                    ^
/usr/local/include/google/protobuf/repeated_field.h:776:41: note: declared private here
class RepeatedPtrField PROTOBUF_FINAL : private internal::RepeatedPtrFieldBase {
                                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
googleapis/gens/google/api/auth.pb.cc:553:27: error: cannot cast '::google::protobuf::RepeatedPtrField< ::google::api::AuthProvider>' to its private base class
    'google::protobuf::internal::RepeatedPtrFieldBase'
providers_.InternalSwap(&other->providers_);
                        ^
/usr/local/include/google/protobuf/repeated_field.h:776:41: note: declared private here
class RepeatedPtrField PROTOBUF_FINAL : private internal::RepeatedPtrFieldBase {
                                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
googleapis/gens/google/api/auth.pb.cc:936:30: error: cannot cast '::google::protobuf::RepeatedPtrField< ::google::api::AuthRequirement>' to its private base class
    'google::protobuf::internal::RepeatedPtrFieldBase'
requirements_.InternalSwap(&other->requirements_);
                            ^
/usr/local/include/google/protobuf/repeated_field.h:776:41: note: declared private here
class RepeatedPtrField PROTOBUF_FINAL : private internal::RepeatedPtrFieldBase {
                                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3 errors generated.
make: *** [googleapis/gens/google/api/auth.pb.o] Error 1

感谢您的帮助，祝您节日愉快。

Answer 1

我设置的一切都是全新的，现在它可以工作了。我认为可能有些包含路径是错误的。(但我真的不知道，为什么它现在有效)

使用git submodule update --init

• run make LANGUAGE=cpp

• compile将https://github.com/googleapis/googleapis

• cd签出到googleapis和签出子模块在子目录googleapis/gens/google/api和googleapis/gens/google/type中分配*.pb.cc文件，并将它们一起放入归档

• 链接中，该链接与grpc和d21库以及一些示例代码一起归档到可执行文件中。如步骤3：c++ v1alpha1 assistant sdk example

中所示，需要安装protobuf和grpc

我把这个脏的makefile放在一起。不是很好，但很管用。

GOOGLEAPIS_GENS_PATH = ./googleapis/gens

API_CCS = $(shell find ./googleapis/gens/google/api -name '*.pb.cc')

TYPE_CCS = $(shell find ./googleapis/gens/google/type -name '*.pb.cc')

ASSISTANT_CCS = $(shell find ./googleapis/gens/google/assistant/embedded/v1alpha2 -name '*.pb.cc')

CC = g++

FLAGS += -I$(GOOGLEAPIS_GENS_PATH)
FLAGS += -std=c++11

SRC = $(API_CCS) $(TYPE_CCS) $(ASSISTANT_CCS)

OBJ = $(SRC:%.cc=%.o)

PROG_FLAGS = $(FLAGS)
PROG_FLAGS += `pkg-config --libs grpc++ grpc`
PROG_FLAGS += `pkg-config --cflags --libs protobuf`
PROG_FLAGS += -I./googleapis/gens/google/assistant/embedded/v1alpha2

PROG_SRC = main.cpp
PROG_OBJ = $(PROG_SRC:%.cpp=%.o)

all: prog

prog: assistant_api.ar $(PROG_SRC)
    $(CC) $(PROG_FLAGS) $(PROG_SRC) assistant_api.ar -o prog

assistant_api.ar: $(OBJ)
    ar r $@ $?

$(OBJ): $(SRC)
    $(CC) -c $(FLAGS) $*.cc -o $*.o

clean:
    rm -rf *.o assistant_api.ar $(OBJ)