When I have several folders 
  \ - A
  \ - B
    \ - B1
    \ - B2

.With various .proto files throughout, and I run CMake (3.5.2) to generate 
the protobuf files, it flattens the whole directory structure to just one 
common folder. There's a few problems with this approach. 

   1. If multiple proto files have the same name (say project.foo and 
   project.bar both have baz.proto), then the compiler chokes on the generated 
   .pb.{h,cpp} files having the same name. 
   2. Without moving the .pb.h files *back* into the same file structure 
   (or a replicated structure elsewhere) as they were initially found in (and 
   having to write a macro to do that), I can't use include statements like 
   #include <project/foo/baz.h>
   3. I've tried making each subfolder a library and then linking them 
   together into one 'meta'-library, which fixes the first two problems, but 
   then within protobuf the import "project/foo/baz.proto" fails because the 
   file is in another directory. 
      1. I think I could use PROTOBUF_IMPORT_DIRS to expand the search, but 
      I may also have to mess with the include directories, specify 
      and so on. And even then, that may have trouble if there are circular 
      dependencies or something.
I can't put the proto files with the code where they're used, because the 
protobufs are common to both C++ and Java projects. So we have to build 
them as an independent library that we can link against with a known header 

Any thoughts or improvements on this?

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