Flutter Rust Bridge - Build Failed with arm-linux-androideabi-ranlib not found (NDK r21e)

[vincent-herlemont]

I am experiencing a build issue while using the flutter_rust_bridge with OpenSSL as a dependency in my project. The build fails with the following error:

install ./include/openssl/x509v3err.h -> /home/user/IdeaProjects/project/rust/target/armv7-linux-androideabi/release/build/openssl-sys-428e15b3dc0bbf30/out/openssl-build/install/include/openssl/x509v3err.h
  install libcrypto.a -> /home/user/IdeaProjects/project/rust/target/armv7-linux-androideabi/release/build/openssl-sys-428e15b3dc0bbf30/out/openssl-build/install/lib/libcrypto.a

  --- stderr
  /home/user/Android/Sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/linux-x86_64/bin/arm-linux-androideabi-ar: creating libcrypto.a
  /bin/sh: 1: arm-linux-androideabi-ranlib: not found
  /home/user/Android/Sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/linux-x86_64/bin/arm-linux-androideabi-ar: creating libssl.a
  /bin/sh: 1: arm-linux-androideabi-ranlib: not found
  /bin/sh: 5: arm-linux-androideabi-ranlib: not found
  make: *** [Makefile:313: install_dev] Error 127
  thread 'main' panicked at '


  Error installing OpenSSL:
      Command: cd "/home/user/IdeaProjects/project/rust/target/armv7-linux-androideabi/release/build/openssl-sys-428e15b3dc0bbf30/out/openssl-build/build/src" && "make" "install_dev"
      Exit status: exit status: 2


      ', /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/openssl-src-111.25.2+1.1.1t/src/lib.rs:505:13
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
warning: build failed, waiting for other jobs to finish...
[2023-04-05T20:49:17Z INFO  cargo_ndk::cli] If the build failed due to a missing target, you can run this command:
[2023-04-05T20:49:17Z INFO  cargo_ndk::cli] 
[2023-04-05T20:49:17Z INFO  cargo_ndk::cli]     rustup target install armv7-linux-androideabi

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:cargoBuildRelease'.
> Process 'command 'sh'' finished with non-zero exit value 101

I am using:

• Flutter 3.7.6
• Android NDK 21.4.7075529
• Rust 1.68.2
• flutter_rust_bridge 1.67.0

I can confirm that arm-linux-androideabi-ranlib exists at the following path:

/home/user/Android/Sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/linux-x86_64/bin/arm-linux-androideabi-ranlib

Here is my Cargo.toml:

[lib]
...
crate-type = ["lib", "staticlib", "cdylib"]

[dependencies]
flutter_rust_bridge = { version = "=1.67.0", features = ["uuid"] }
openssl = { version = "0.10", features = ["vendored"] }
...

And this is the relevant part of my build.gradle:

[
        new Tuple2('Debug', ''),
        new Tuple2('Profile', '--release'),
        new Tuple2('Release', '--release')
].each {
    def taskPostfix = it.first
    def profileMode = it.second
    tasks.whenTaskAdded { task ->
        if (task.name == "javaPreCompile$taskPostfix") {
            task.dependsOn "cargoBuild$taskPostfix"
        }
    }
    tasks.register("cargoBuild$taskPostfix", Exec) {
        commandLine 'sh', '-c', """cd ../../rust/my_lib  && \
        ANDROID_NDK_HOME="$ANDROID_NDK" cargo ndk \
            -t armeabi-v7a -t arm64-v8a -t x86 -t x86_64 \
            -o ../android/app/src/main/jniLibs build $profileMode"""
    }
}

I am not sure if this is the right place to post this issue, as I am hesitating between the flutter_rust_bridge and the OpenSSL project, so my apologies if I'm not in the right place. Any help would be greatly appreciated.

[fzyzcjy]

Hmm IMHO it may just be a problem with openssl+rust+android, instead of the bridge?

[vincent-herlemont]

@fzyzcjy I agree but I made a discovery that I don't understand.

This error appeared when I changed the structure of the project.
Before, I only had one /rust crate containing ./api.rs. Now in the ./rust folder I have a cargo workspace with several crates. And I point in the build.gradle code to the lib folder ./rust/my_lib containing the ./api.rs.

I do that

   tasks.register("cargoBuild$taskPostfix", Exec) {
        commandLine 'sh', '-c', """cd ../../rust/my_lib  && \
        ANDROID_NDK_HOME="$ANDROID_NDK" cargo ndk \
...
    }

instead of

   tasks.register("cargoBuild$taskPostfix", Exec) {
        commandLine 'sh', '-c', """cd ../../rust  && \
        ANDROID_NDK_HOME="$ANDROID_NDK" cargo ndk \
...
    }

Could this be related to the error?

[fzyzcjy]

Well, maybe it is great to make a minimal reproducible sample. For example, if you guess this is error, maybe use the plain old non-workspace way, and see if the error disappears, etc

[vincent-herlemont]

may just be a problem with openssl+rust+android, instead of the bridge?

@fzyzcjy My bad, in fact, you're right, it is coming from an upgrade of openssl-src, the new version is broken for android alexcrichton/openssl-src-rs#188.