Hello,
I'm trying to use protobuf in a project with multiple libraries, where
different libraries define message types that can ultimately be
combined. Thus I have different proto files, in different directories.
I understand I can use the "package" directive to let protoc generate
appropriate namespaces in the generated C++ code.
However, I'm surprised that the relative path location (as indicated
with the "import" directive) also influences the generated code.
Notably, I'm using `import "TSMarkers/Frame.proto"`, which causes a
function call "protobuf_TSMarkers_2fFrame_2eproto::InitDefaultsFrame();"
to be generated, though that function doesn't exist.
Is this behaviour documented somewhere ? I was thinking of the "import"
statement as something akin to C++ includes, where the path has no
bearing on how the (preprocessed) code is seen by the compiler, i.e. I'm
free to move C++ headers around, as long as I adjust the include search
paths. But with protoc, the (relative) location matters to the code.
Are there any guidelines on how to use protobuf (and protoc in
particular) in an environment with multiple ("distributed") proto files ?
(The CMake docs in
https://cmake.org/cmake/help/v3.9/module/FindProtobuf.html mention
"The |protobuf_generate_cpp| and |protobuf_generate_python| functions
and |add_executable()|
<https://cmake.org/cmake/help/v3.9/command/add_executable.html#command:add_executable>
or |add_library()|
<https://cmake.org/cmake/help/v3.9/command/add_library.html#command:add_library>
calls only work properly within the same directory.", which is rather
cryptic, but may hint things not working in non-local situations like
mine, though given that this is part of the CMake docs, I wouldn't
expect this to have any bearing on protobuf itself.)
Thanks,
Stefan
--
...ich hab' noch einen Koffer in Berlin...
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