makefile 中的 protoc 来构建 protobuf

Question

我已经安装了一个协议缓冲区，就像https://github.com/google/protobuf/blob/master/src/README.md上的教程一样

之后我想构建 protobuf 并使用以下命令安装 go 库：

go get -u github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway
go get -u github.com/grpc-ecosystem/grpc-gateway/protoc-gen-swagger
go get -u github.com/golang/protobuf/protoc-gen-go
make # generate app and protobuf

我的根目录上有文件Makefile，如下所示：

get:
    echo "Build Proto"
    protoc -I/usr/local/include -I. -I$GOPATH/src -I$GOPATH/src/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis proto/item.proto --go_out=plugins=grpc:.
    protoc -I/usr/local/include -I. -I$GOPATH/src -I$GOPATH/src/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis proto/item.proto --grpc-gateway_out=logtostderr=true:.
    protoc -I/usr/local/include -I. -I$GOPATH/src -I$GOPATH/src/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis proto/item.proto --swagger_out=logtostderr=true:.
    echo "Build APP"
    CGO_ENABLED=0 GOOS=linux go build -o ./server/storeitemservice ./server/cmd/server/main.go

但我想使用命令make 在我的应用程序根目录中生成应用程序和protobuf 来构建我的应用程序，结果如下：

echo "Build Proto"
Build Proto
protoc -I/usr/local/include -I. -IOPATH/src -IOPATH/src/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis proto/item.proto --go_out=plugins=grpc:.
OPATH/src: warning: directory does not exist.
OPATH/src/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis: warning: directory does not exist.
google/api/annotations.proto: File not found.
proto/item.proto: Import "google/api/annotations.proto" was not found or had errors.
Makefile:2: recipe for target 'get' failed
make: *** [get] Error 1

在看到这样的问题后，我检查了它的每个目录，结果发现全部都有。

Answer 1

你需要像这样包装你的 $GOPATH

protoc -I/usr/local/include -I. -I$(GOPATH)/src \
       -I$(GOPATH)/src/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis \
       proto/item.proto --go_out=plugins=grpc:.

添加\ 是为了便于在此处阅读。关键是$(GOPATH) vs $GOPATH

这是一个演示：

get:
    echo $(GOPATH)
    echo $GOPATH

和输出

echo /Users/sberry/Development/golang
/Users/sberry/Development/golang
echo OPATH
OPATH

在了解 Makefile 语法的编辑器中，您可以看到差异