Makefile dependency generator plugin for protoc.

protoc-gen-depends.py

#!/usr/bin/python
# Save this file as protoc-gen-depends, put it in your path (executable) and add "--depends-out=/whatever/path" to your protoc invocation

from google.protobuf.compiler.plugin_pb2 import CodeGeneratorRequest,CodeGeneratorResponse
from sys import stdin,stdout

req = CodeGeneratorRequest()
req.MergeFromString(''.join(stdin.readlines()))
res = CodeGeneratorResponse()

def add_depends(fd):
    prefix = fd.name[0:-5]
    depend_file = CodeGeneratorResponse.File()
    depend_file.name = prefix + 'd'
    depend_file.content = '{0}pb.cc {0}pb.h: {1} {2}\n'.format(prefix,fd.name,' '.join([f for f in fd.dependency if not f.startswith('google/protobuf')]))
    return depend_file

res.file.extend([add_depends(fileDescriptor) for fileDescriptor in req.proto_file if not fileDescriptor.name.startswith('google/protobuf')])

stdout.write(res.SerializeToString())