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e36b4564d2
This commit: - Bumps the nanopb version - Adds all runtime configuration options - Implements proper cross-compilation support which is the main use-case of the library. - Uses newer `finalAttrs` form of `mkDerivation` to allow for easier attribute overrides. The cross-compilation support is achieved by splitting the package into two sub-packages consisting of the build-time generator and the runtime library. Nanopb explicitely supports this by providing specialized `GENERATOR` and `RUNTIME` CMake configuration options. The top-level package uses `propagatedNativeBuildInputs` and `propagatedBuildInputs` to propagate the sub-packages and also adds convenient symlinks to make certain use cases easier. == GENERATOR == The generator is a mostly ready-to-be-packaged python module tree. We patch the library to also include the missing `__init__.py` and we also fix the `PYTHON_INSTDIR` variable to follow best practice and to prevent the library from attempting to install to a global directory. We package the python module using `buildPythonPackage` and internally override python in order to wrap the `nanopb_generator.py` executable. We do *not* wrap `nanob_generator.py` due to it also being imported directly from python when used through `protoc-gen-nanopb`. == RUNTIME == The runtime is a simple library that consists of the common functionality among generated headers/sources. It is configured through `preprocessor definitions` and consumer projects *must* be compiled with the same definitions. This is currently achieved by exposing all configuration options through the top-level overrides and patching the CMakeLists.txt so that the definitions are added to the to-be-installed CMake targets as PUBLIC properties.
30 lines
979 B
Nix
30 lines
979 B
Nix
{ lib, stdenv, nanopb }:
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stdenv.mkDerivation {
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name = "nanopb-test-simple-proto3";
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meta.timeout = 60;
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src = lib.fileset.toSource {
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root = ./.;
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fileset = lib.fileset.unions [ ./simple.proto ];
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};
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buildInputs = [ nanopb ];
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# protoc requires any .proto file to be compiled to reside within it's
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# proto_path. By default the current directory is automatically added to the
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# proto_path. I tried using --proto_path ${./.} ${./simple.proto} and it did
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# not work because they end up in the store at different locations.
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dontInstall = true;
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buildPhase = ''
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mkdir $out
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protoc --plugin=protoc-gen-nanopb=${nanopb}/bin/protoc-gen-nanopb --nanopb_out=$out simple.proto
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'';
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doCheck = true;
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checkPhase = ''
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grep -q SimpleMessage $out/simple.pb.c || (echo "ERROR: SimpleMessage not found in $out/simple.pb.c"; exit 1)
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grep -q SimpleMessage $out/simple.pb.h || (echo "ERROR: SimpleMessage not found in $out/simple.pb.h"; exit 1)
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'';
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}
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