CMake: Allow build system to provide protobuf compiler #703
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When building without Hunter, it is desirable to pass the path to protoc and the protobuf include directory from the build system. Allow these variables to be overridden. Fixes the error: | CMake Error at cmake/functions.cmake:52 (message): | Protobuf_PROTOC_EXECUTABLE is empty | Call Stack (most recent call first): | cmake/functions.cmake:96 (compile_proto_to_cpp) | src/crypto/protobuf/CMakeLists.txt:6 (add_proto_library)
xDimon
approved these changes
Mar 30, 2021
Harrm
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Mar 31, 2021
Harrm
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Nov 5, 2021
When building without Hunter, it is desirable to pass the path to protoc and the protobuf include directory from the build system. Allow these variables to be overridden. Fixes the error: | CMake Error at cmake/functions.cmake:52 (message): | Protobuf_PROTOC_EXECUTABLE is empty | Call Stack (most recent call first): | cmake/functions.cmake:96 (compile_proto_to_cpp) | src/crypto/protobuf/CMakeLists.txt:6 (add_proto_library) Co-authored-by: Garrett Brown <[email protected]>
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Referenced issues
This ports the relevant CMake patches from libp2p/cpp-libp2p#59 over to kagome,
Not sure if the license is compatible and it might be required that @eigendude signs the CLA as this is his patch, just applied to a different code base.
Description of the Change
When building without Hunter, it is desirable to pass the path to protoc and
the protobuf include directory from the build system. Allow these variables
to be overridden.
Fixes the error:
| CMake Error at cmake/functions.cmake:52 (message):
| Protobuf_PROTOC_EXECUTABLE is empty
| Call Stack (most recent call first):
| cmake/functions.cmake:96 (compile_proto_to_cpp)
| src/crypto/protobuf/CMakeLists.txt:6 (add_proto_library)
Benefits
Support building kagome without hunter.
Possible Drawbacks
None
Alternate Designs
The alternative would be to not use custom functions at all but to use the functions provided by CMake or the protobuffer CMake pacakge config to compile any
.protofiles. I have a patch for this as well, but it is far more intrusive.