On Thu, May 26, 2011 at 4:29 AM, lzhshen <lzhs...@gmail.com> wrote:
> Take addressbook.proto as example, following command does not work:
> c++ addressbook.pb.cc -o addressbook.o  `pkg-config --cflags
> protobuf`
> Following are error output:
> /usr/lib64/gcc/x86_64-unknown-linux/4.1.2/../../../../lib64/crt1.o: In
> function `_start':
> (.text+0x20): undefined reference to `main'
> /tmp/ccjvcDzQ.o: In function `tutorial::Person::SharedDtor()':
> addressbook.pb.cc:(.text+0x64a): undefined reference to
> `google::protobuf::internal::kEmptyString'
> addressbook.pb.cc:(.text+0x67f): undefined reference to
> `google::protobuf::internal::kEmptyString'
> /tmp/ccjvcDzQ.o: In function
> `tutorial::Person_PhoneNumber::SharedDtor()':
> addressbook.pb.cc:(.text+0x6c2): undefined reference to
> `google::protobuf::internal::kEmptyString'
> /tmp/ccjvcDzQ.o: In function `tutorial::Person_PhoneNumber::ByteSize()
> const':
> Have any idea?

Yes, you tried to link the file into an executable instead of an
object file, and the linker is complaining because it cannot find a
valid main(), among many other functions.  GCC requires the '-c'
option to tell it to output an object file instead of an executable.


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