The revised protocol buffer support seems to be compiling for me when using the protobuf-c cross-compiler. However, I still cannot construct a library of the results. This may be a Hadoop issue, or could be an issue with the protobuf-c cross-compiler. What I see are a bunch of these when attempting to link the resulting .o files:
/home/common/hadoop/hadoop-common/foo/obj/DatanodeProtocol.pb-c.o: In function `hadoop_hdfsreport_bad_blocks_request_proto_init':
DatanodeProtocol.pb-c.c.text+0x2bb4): multiple definition of `hadoop_hdfsreport_bad_blocks_request_proto_init'
/home/common/hadoop/hadoop-common/foo/obj/ClientNamenodeProtocol.pb-c.o:ClientNamenodeProtocol.pb-c.c.text+0x277d): first defined here
From what I can see, this is caused by the
line in the .proto files, when combined with the later
This appears to bring a complete copy of the hdfs.proto file into the source code, which then recompiles it - leading to the duplicate symbols.
I have attached an updated pcreate.pl script that illustrates the problem. Excluding the following .proto files allows all to be successfully built and linked: