Android build fails

[olliiiver]

Hello.

I'm trying to build the library for iOS and Android. iOS build works perfectly fine by using Expo.

I was wondering, if I can also do a build for Android as well, but that fails with the following message:

  C++ build system [configure] failed while executing:
      /Users/oliver/Library/Android/sdk/cmake/3.22.1/bin/cmake \
        -H/Users/oliver/Documents/cc/matrix-test/matrix-test/node_modules/react-native/ReactAndroid/cmake-utils/default-app-setup \
        -DCMAKE_SYSTEM_NAME=Android \
        -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
        -DCMAKE_SYSTEM_VERSION=24 \
        -DANDROID_PLATFORM=android-24 \
        -DANDROID_ABI=arm64-v8a \
        -DCMAKE_ANDROID_ARCH_ABI=arm64-v8a \
        -DANDROID_NDK=/Users/oliver/Library/Android/sdk/ndk/26.1.10909125 \
        -DCMAKE_ANDROID_NDK=/Users/oliver/Library/Android/sdk/ndk/26.1.10909125 \
        -DCMAKE_TOOLCHAIN_FILE=/Users/oliver/Library/Android/sdk/ndk/26.1.10909125/build/cmake/android.toolchain.cmake \
        -DCMAKE_MAKE_PROGRAM=/Users/oliver/Library/Android/sdk/cmake/3.22.1/bin/ninja \
        -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=/Users/oliver/Documents/cc/matrix-test/matrix-test/android/app/build/intermediates/cxx/Debug/536k5e17/obj/arm64-v8a \
        -DCMAKE_RUNTIME_OUTPUT_DIRECTORY=/Users/oliver/Documents/cc/matrix-test/matrix-test/android/app/build/intermediates/cxx/Debug/536k5e17/obj/arm64-v8a \
        -DCMAKE_BUILD_TYPE=Debug \
        -DCMAKE_FIND_ROOT_PATH=/Users/oliver/Documents/cc/matrix-test/matrix-test/android/app/.cxx/Debug/536k5e17/prefab/arm64-v8a/prefab \
        -B/Users/oliver/Documents/cc/matrix-test/matrix-test/android/app/.cxx/Debug/536k5e17/arm64-v8a \
        -GNinja \
        -DPROJECT_BUILD_DIR=/Users/oliver/Documents/cc/matrix-test/matrix-test/android/app/build \
        -DREACT_ANDROID_DIR=/Users/oliver/Documents/cc/matrix-test/matrix-test/node_modules/react-native/ReactAndroid \
        -DANDROID_STL=c++_shared \
        -DANDROID_USE_LEGACY_TOOLCHAIN_FILE=ON
    from /Users/oliver/Documents/cc/matrix-test/matrix-test/android/app
  CMake Error at /Users/oliver/Documents/cc/matrix-test/matrix-test/android/app/build/generated/autolinking/src/main/jni/Android-autolinking.cmake:9 (add_subdirectory):
    add_subdirectory given source
    "/Users/oliver/Documents/cc/matrix-test/matrix-test/node_modules/@unomed/react-native-matrix-sdk/android/build/generated/source/codegen/jni/"
    which is not an existing directory.
  Call Stack (most recent call first):
    /Users/oliver/Documents/cc/matrix-test/matrix-test/node_modules/react-native/ReactAndroid/cmake-utils/ReactNative-application.cmake:85 (include)
    CMakeLists.txt:31 (include)


  CMake Error at /Users/oliver/Documents/cc/matrix-test/matrix-test/node_modules/react-native/ReactAndroid/cmake-utils/ReactNative-application.cmake:88 (target_link_libraries):
    Cannot specify link libraries for target
    "react_codegen_RNReactNativeMatrixSdkSpec" which is not built by this
    project.

For reproducing this, I've added a small repo here:

https://github.com/olliiiver/matrix_rust_sdk_test

It seems the build process is missing a build step. How can I fix this?

Any help would be greatly appreciated!

Regards,

Oliver

[Johennes]

This might mean that the code generation didn't run. 🤔

    "/Users/oliver/Documents/cc/matrix-test/matrix-test/node_modules/@unomed/react-native-matrix-sdk/android/build/generated/source/codegen/jni/"
    which is not an existing directory.

I'm not at all familiar with Expo, unfortunately, but in the example app in this repo, codegen is triggered in build.gradle: https://github.com/unomed-dev/react-native-matrix-sdk/blob/main/example/android/app/build.gradle#L125

[olliiiver]

Hi @Johennes.

Thanks for the quick response. Looks like the code is being built automatically in android/generated/jni without the need of any specific config in the react native project.

If I copy over the files after a first run, the Android build works:

mkdir -p ./node_modules/@unomed/react-native-matrix-sdk/android/build/generated/source/codegen
cp -r ./node_modules/@unomed/react-native-matrix-sdk/android/generated/jni ./node_modules/@unomed/react-native-matrix-sdk/android/build/generated/source/codegen

I would provide a PR, but I couldn't figure out where the codegen directory is (or can be) specified inside build process of the library.

Any idea?

Regards,

Oliver

[Johennes]

Oh, interesting. The output directories for codegen are specified in package.json.

  "codegenConfig": {
    "name": "RNReactNativeMatrixSdkSpec",
    "type": "all",
    "jsSrcsDir": "src",
    "outputDir": {
      "ios": "ios/generated",
      "android": "android/generated"
    },
    "android": {
      "javaPackageName": "com.unomed.reactnativematrixsdk"
    },
    "includesGeneratedCode": true
  },

It's interesting that they're being expected in another location in your build. 😵‍💫

Could you check if changing the outputDir values makes it codegen into the right location in your build?

We made a fix in uniffi-bindgen-react-native to handle non-standard codegen output dirs a while ago that hasn't been consumed in react-native-matrix-sdk yet. However, I'm not sure that's related.

[olliiiver]

Hi @Johennes,

I've changed the outputDir in package.json, but without any luck.

It seems that React Native expects the files at android/build/generated/source/codegen/ rather than in android/generated, see:

https://github.com/facebook/react-native/blob/3cc67fed36c9bc52e5aafec6aeceb21c95a1f919/packages/react-native/ReactAndroid/cmake-utils/ReactNative-application.cmake#L99

However, I couldn't find the right place where the build process creates android/generated, so that this part could be changed...

[Johennes]

I think you might have to trigger codegen manually after changing package.json with yarn react-native codegen --path node_modules/@unomed/react-native-matrix-sdk.

When I apply the following diff, I'm getting the generated code under the expected path.

diff --git a/package.json b/package.json
index 38a562a..36aeacd 100644
--- a/package.json
+++ b/package.json
@@ -201,7 +201,7 @@
     "jsSrcsDir": "src",
     "outputDir": {
       "ios": "ios/generated",
-      "android": "android/generated"
+      "android": "android/build/generated/source/codegen"
     },
     "android": {
       "javaPackageName": "com.unomed.reactnativematrixsdk"
diff --git a/react-native.config.js b/react-native.config.js
index 21980d4..66211da 100644
--- a/react-native.config.js
+++ b/react-native.config.js
@@ -5,7 +5,7 @@ module.exports = {
   dependency: {
     platforms: {
       android: {
-        cmakeListsPath: 'generated/jni/CMakeLists.txt',
+        cmakeListsPath: 'build/generated/source/codegen/jni/CMakeLists.txt',
       },
     },
   },

I'm still confused that ReactNative-application.cmake hardcodes a specific path when the output folder is configurable in package.json.

I'm also not sure why I haven't seen this in the project I'm consuming react-native-matrix-sdk but maybe it's because I'm not on the latest RN version there.