I am trying to use sqlx for sqlite through rust frb v2

[debojyoti452]

Describe the bug

I am trying to use sqlx for sqlite through rust frb v2 but getting this error on android run. Building is working fine.

E/flutter ( 9868): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: Invalid argument(s): Failed to load dynamic library 'librust_lib.so': dlopen failed: cannot locate symbol "__extenddftf2" referenced by "/data/app/~~4t8ZBCcFskEbsMOKdY79Ag==/com.swing.hexagon.hexagon_flutter-OI2Iz7v_OHZHUI6KqbGHuw==/lib/x86_64/librust_lib.so"...
E/flutter ( 9868): #0      _open (dart:ffi-patch/ffi_dynamic_library_patch.dart:11:43)
E/flutter ( 9868): #1      new DynamicLibrary.open (dart:ffi-patch/ffi_dynamic_library_patch.dart:22:12)
E/flutter ( 9868): #2      new ExternalLibrary.open (package:flutter_rust_bridge/src/platform_types/_io.dart:39:47)
E/flutter ( 9868): #3      loadExternalLibraryRaw (package:flutter_rust_bridge/src/loader/_io.dart:56:28)
E/flutter ( 9868): #4      loadExternalLibrary (package:flutter_rust_bridge/src/loader/_io.dart:14:10)
E/flutter ( 9868): #5      BaseEntrypoint._loadDefaultExternalLibrary (package:flutter_rust_bridge/src/main_components/entrypoint.dart:107:13)
E/flutter ( 9868): #6      BaseEntrypoint.initImpl (package:flutter_rust_bridge/src/main_components/entrypoint.dart:53:31)
E/flutter ( 9868): #7      RustLib.init (package:hexagon_flutter/generated_rust/frb_generated.dart:26:20)
E/flutter ( 9868): #8      main (package:hexagon_flutter/main.dart:44:17)
E/flutter ( 9868): #9      _runMain.<anonymous closure> (dart:ui/hooks.dart:301:23)
E/flutter ( 9868): #10     _delayEntrypointInvocation.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:297:19)
E/flutter ( 9868): #11     _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12)
E/flutter ( 9868): 

Steps to reproduce

Hint: A simple way to reproduce is to clone and modify the https://github.com/fzyzcjy/flutter_rust_bridge/tree/master/frb_example/dart_minimal example package according to your needs.

1. ...
2. ...
3. ...

Logs

E/flutter ( 9868): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: Invalid argument(s): Failed to load dynamic library 'librust_lib.so': dlopen failed: cannot locate symbol "__extenddftf2" referenced by "/data/app/~~4t8ZBCcFskEbsMOKdY79Ag==/com.swing.hexagon.hexagon_flutter-OI2Iz7v_OHZHUI6KqbGHuw==/lib/x86_64/librust_lib.so"...
E/flutter ( 9868): #0      _open (dart:ffi-patch/ffi_dynamic_library_patch.dart:11:43)
E/flutter ( 9868): #1      new DynamicLibrary.open (dart:ffi-patch/ffi_dynamic_library_patch.dart:22:12)
E/flutter ( 9868): #2      new ExternalLibrary.open (package:flutter_rust_bridge/src/platform_types/_io.dart:39:47)
E/flutter ( 9868): #3      loadExternalLibraryRaw (package:flutter_rust_bridge/src/loader/_io.dart:56:28)
E/flutter ( 9868): #4      loadExternalLibrary (package:flutter_rust_bridge/src/loader/_io.dart:14:10)
E/flutter ( 9868): #5      BaseEntrypoint._loadDefaultExternalLibrary (package:flutter_rust_bridge/src/main_components/entrypoint.dart:107:13)
E/flutter ( 9868): #6      BaseEntrypoint.initImpl (package:flutter_rust_bridge/src/main_components/entrypoint.dart:53:31)
E/flutter ( 9868): #7      RustLib.init (package:hexagon_flutter/generated_rust/frb_generated.dart:26:20)
E/flutter ( 9868): #8      main (package:hexagon_flutter/main.dart:44:17)
E/flutter ( 9868): #9      _runMain.<anonymous closure> (dart:ui/hooks.dart:301:23)
E/flutter ( 9868): #10     _delayEntrypointInvocation.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:297:19)
E/flutter ( 9868): #11     _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12)
E/flutter ( 9868):

Expected behavior

No response

Generated binding code

No response

OS

No response

Version of flutter_rust_bridge_codegen

No response

Flutter info

No response

Version of clang++

No response

Additional context

No response

[fzyzcjy]

dlopen failed: cannot locate symbol "__extenddftf2" referenced by "/data/app/~~4t8ZBCcFskEbsMOKdY79Ag==/com.swing.hexagon.hexagon_flutter-OI2Iz7v_OHZHUI6KqbGHuw==/lib/x86_64/librust_lib.so"

Looks like this symbol is not found, thus this may not be a bug of flutter_rust_bridge, but related to how the Rust code is copiled. One reason may be that, sqlx/sqlite needs some special configurations in order to be used on android.

[debojyoti452]

dlopen failed: cannot locate symbol "__extenddftf2" referenced by "/data/app/~~4t8ZBCcFskEbsMOKdY79Ag==/com.swing.hexagon.hexagon_flutter-OI2Iz7v_OHZHUI6KqbGHuw==/lib/x86_64/librust_lib.so"

Looks like this symbol is not found, thus this may not be a bug of flutter_rust_bridge, but related to how the Rust code is copiled. One reason may be that, sqlx/sqlite needs some special configurations in order to be used on android.

Yeah, it is working on real device, but not on emulator.

[fzyzcjy]

Aha, then is it possible because sqlx/sqlite does not have things like precompiled binaries for x86/x64?

[debojyoti452]

yeah exactly, trying to figure out whether there is any other way around. btw tried rusqlite, that too didn't worked on emulator.

[fzyzcjy]

Then one way may be to ask in wrapper libs like sqlx, e.g. I guess maybe they will add x64 files.

[debojyoti452]

Seems like even Mozilla also faced similar issues

there is some NDK version issues, and setting up the compiler for x86_x64

• 94.3.0 release has a linkage problem in some devices mozilla/application-services#5165
• https://github.com/mozilla/application-services/pull/5442/files
• Replace '-lgcc' option in ndk 23. Fixes #75. mozilla/rust-android-gradle#83

[gridbox]

@debojyoti452 How do you have your project configured? I am currently using sqlcipher with sqlx via FRB. I had to configure libsqlite3-sys in my Cargo.toml to use the bundled version of sqlcipher but you should be able to do the same with the vanilla sqlite. I have been able to run on MacOS, Android Emulator, and iOS Simulator.

Here's a snippet from my Cargo.toml

libsqlite3-sys = { version = "*", features = [
    "bundled-sqlcipher-vendored-openssl",
] }
sqlx = { version = "0.7", features = [
    "sqlite",
    "runtime-tokio",
    "macros",
    "uuid",
    "chrono",
] }

[debojyoti452]

Thanks @gridbox for the suggestion. I am currently shifted to rusqlite. But not working on android emulator. Working fine on real device though. And working fine all other platforms too.
Let try with libsqlite3 🙏

[debojyoti452]

@fzyzcjy btw is there any way we can set NDK version?

[debojyoti452]

x86 emulator working fine, but not at all able to make it work on x86_x64 emulator 😢

[fzyzcjy]

btw is there any way we can set NDK version?

Since flutter_rust_bridge is using cargokit for the default template (assuming you are using the default template), I guess cargokit may have some options to configure that.

[debojyoti452]

btw is there any way we can set NDK version?

Since flutter_rust_bridge is using cargokit for the default template (assuming you are using the default template), I guess cargokit may have some options to configure that.

@fzyzcjy trying to find it in cargokit

[mike-lloyd03]

I had a problem getting sqlite projects to build for Android using uniffi. This comment pointed me in the right direction. This is what my build.rs looks like for that project to solve this problem:

use std::env;

fn main() {
    let target_arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap();
    let target_os = env::var("CARGO_CFG_TARGET_OS").unwrap();

    if target_arch == "x86_64" && target_os == "android" {
        let android_home = env::var("ANDROID_HOME").expect("ANDROID_HOME not set");
        const ANDROID_NDK_VERSION: &str = "26.1.10909125";
        const LINUX_X86_64_LIB_DIR: &str =
            "toolchains/llvm/prebuilt/linux-x86_64/lib/clang/17/lib/linux/";
        println!("cargo:rustc-link-search={android_home}/ndk/{ANDROID_NDK_VERSION}/{LINUX_X86_64_LIB_DIR}");
        println!("cargo:rustc-link-lib=static=clang_rt.builtins-x86_64-android");
    }
}

Modified from this build.rs.

Note that I haven't tried this with frb yet so this might not work as is.

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