java - iOS 上的 UnsatisfiedLinkError 而不是 Android，loadLibrary 总是成功

Question

我有一些 Java 和 C++ 代码，我可以在这两个平台上编译它们并构建 native 库。我可以验证这些库是否包含我期望的功能，并且 Java 能够在 Android 和 iOS 上加载这些库。在 Android 上一切顺利，没有崩溃，但在 iOS 上我遇到了一个非常令人沮丧的错误:

2015-05-11 11:34:48.418 IOSLauncher[52454:851038] [info] test: initializing native libraries...
2015-05-11 11:34:48.418 IOSLauncher[52454:851038] [info] test: library path set to:       "/Users/test/Library/Developer/CoreSimulator/Devices/A189459D-B2D5-4E78-A6E4-A7EAD19DA017/data/Containers/Bundle/Application/DF265D55-DA3C-4C10-851D-20591C4C8C06/IOSLauncher.app"
2015-05-11 11:34:48.419 IOSLauncher[52454:851038] [info] test: loading native libraries on x86_64...
2015-05-11 11:34:48.419 IOSLauncher[52454:851038] [info] test:  test
2015-05-11 11:34:48.424 IOSLauncher[52454:851038] [info] test: loaded libraries successfully

java.lang.UnsatisfiedLinkError: com/test/Native.getPointer()J
    at com.test.Native.getPointer(Native Method)
    at com.test.WavApp.initNativeEngine(WavApp.java)
    at com.test.WavApp.create(WavApp.java)
    at com.badlogic.gdx.backends.iosrobovm.IOSGraphics.draw(IOSGraphics.java)
    at com.badlogic.gdx.backends.iosrobovm.IOSGraphics$1.draw(IOSGraphics.java)
    at com.badlogic.gdx.backends.iosrobovm.IOSGraphics$1.$cb$drawRect$(IOSGraphics.java)
    at org.robovm.apple.uikit.UIApplication.main(Native Method)
    at org.robovm.apple.uikit.UIApplication.main(UIApplication.java)
    at com.test.IOSLauncher.main(IOSLauncher.java)


BUILD SUCCESSFUL

Total time: 18.262 secs

com/test/Native.java 中 java 代码的快照:

static 
{
      System.loadLibrary("test");
      Log.i("loaded libraries successfully");
}

public static native long getPointer();
public static native void freePointer(long enginePointer);

以及编译成libtest.dylib的C++代码:

extern "C"
{
    JNIEXPORT jlong JNICALL Java_com_test_Native_getPointer(JNIEnv* env, jobject thiz)
    {
        return (jlong)(new PointerTest());
    }

    JNIEXPORT void JNICALL Java_com_test_Native_freePointer(JNIEnv* env, jobject thiz,
        jlong enginePtr)
    {
        if ((PointerTest*)enginePtr)
            delete (PointerTest*)enginePtr;
    }
}

关于构建的共享库的更多信息:

Release$ file libtest.dylib
libtest.dylib: Mach-O 64-bit dynamically linked shared library x86_64

并验证导出:

$ nm -g libtest.dylib | grep Native
0000000000011ce0 T _Java_com_test_Native_freePointer
0000000000011c40 T _Java_com_test_Native_getPointer

有什么想法吗？这让我发疯了几个小时。我可以通过简单地使用不同的库并搜索该函数来在我的 Android 设备上重现此错误。我猜 xcode 以某种方式隐藏或剥离了符号，但这似乎与我上面显示它们在那里的 nm 输出无关。

Answer 1

像往常一样，解决方案就在我面前:

libtest.dylib: Mach-O 64-bit dynamically linked shared library x86_64

为iOS构建，架构应该是armv7+。 xcode 子项目配置错误。