Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 657 by [email protected]: Unnecessary dependency against protobuf
in third-level targets.
http://code.google.com/p/protobuf/issues/detail?id=657
I have C++ generated file, say `a.pb.cc`, and I link it into shared library
`a.so`. This library is also linked against `libprotobuf.so`.
When I do include `a.pb.h` in another file, say `test.cc`, I can't link it
into executable `test` without adding dependency on `libprotobuf.so`:
otherwise, I get undefined symbols errors, like:
"google::protobuf::internal::RepeatedPtrFieldBase::Reserve(int)"
"google::protobuf::internal::kEmptyString"
"google::protobuf::internal::ExtensionSet::ReleaseMessage(int,
google::protobuf::MessageLite const&)"
"google::protobuf::internal::ExtensionSet::MutableMessage(int, unsigned
char, google::protobuf::MessageLite const&,
google::protobuf::FieldDescriptor const*)"
The sum-up of dependencies:
1) test (test.cc includes a.pb.h) depends on a.so (a.pb.cc includes a.pb.h)
2) a.so (a.pb.cc includes a.pb.h) depends on libprotobuf.so
3) test (test.cc includes a.pb.h) depends on libprotobuf.so (!)
The possible reason is that I don't know enough about the linking.
The other possible reason is a design flaw in generated files - I don't see
any particular reason to link against protobuf every target that already
links against generated protobuf files or just includes some .pb.h
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