Question

我正在尝试使用独立工具链为具有自己的构建过程的项目构建一个静态库，然后我用C ++库包装并向Android公开（使用ndk-build编译）。但是，在ndk-build步骤中，我收到以下错误：

➜  jni /Users/chrisfosterelli/Library/Android/sdk/ndk-bundle/ndk-build                    
[arm64-v8a] Compile++      : wrapper <= wrapper.cpp
In file included from /Users/chrisfosterelli/workspace/android/jni/wrapper.cpp:9:
In file included from ../prebuild/include/valhalla/meili/universal_cost.h:7:
In file included from ../prebuild/include/valhalla/sif/dynamiccost.h:4:
In file included from ../prebuild/include/valhalla/baldr/directededge.h:5:
../prebuild/include/valhalla/baldr/graphconstants.h:432:11: warning: 21 enumeration values not handled in switch: 'kRoad', 'kRamp', 'kTurnChannel'... [-Wswitch]
  switch (use) {
          ^
1 warning generated.
[arm64-v8a] SharedLibrary  : libwrapper.so
/Users/chrisfosterelli/Library/Android/sdk/ndk-bundle/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/lib/gcc/aarch64-linux-android/4.9.x/../../../../aarch64-linux-android/bin/ld: /Users/chrisfosterelli/workspace/android/jni/../prebuild/libvalhalla_meili.a(libvalhalla_meili_la-map_matcher_factory.o): Relocations in generic ELF (EM: 62)
[...above message repeated many times...]
/Users/chrisfosterelli/workspace/android/jni/../prebuild/libvalhalla_meili.a: error adding symbols: File in wrong format
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [/Users/chrisfosterelli/workspace/android/obj/local/arm64-v8a/libwrapper.so] Error 1
➜  jni ls /Users/chrisfosterelli/Library/Android/sdk/ndk-bundle/

据我所知，这个错误表明我正在尝试混合和匹配为不同架构编译的二进制文件。但是，据我所知，图书馆是正确的架构：

root@eacbdb1c0e46:/meili/meili2/newtest# ar x libvalhalla_meili.a 
root@eacbdb1c0e46:/meili/meili2/newtest# file libvalhalla_meili_la-map_matcher_factory.o 
libvalhalla_meili_la-map_matcher_factory.o: ELF 64-bit LSB relocatable, ARM aarch64, version 1 (SYSV), not stripped
root@eacbdb1c0e46:/meili/meili2/newtest#

FWIW，这些是我目前的Application.mk，

APP_STL := c++_static
APP_CPPFLAGS := -frtti -std=gnu++11 -D_GLIBCXX_USE_C99
APP_CPPFLAGS += -fexceptions
NDK_TOOLCHAIN_VERSION := clang
APP_LDFLAGS := -latomic
APP_PLATFORM := android-21
APP_ABI := arm64-v8a

和Android.mk，

LOCAL_PATH := $(call my-dir)

# static library info
include $(CLEAR_VARS)
LOCAL_MODULE := libvalhalla_meili
LOCAL_SRC_FILES := ../prebuild/libvalhalla_meili.a
LOCAL_EXPORT_C_INCLUDES := ../prebuild/include
include $(PREBUILT_STATIC_LIBRARY)

# wrapper info
include $(CLEAR_VARS)
LOCAL_C_INCLUDES += ../prebuild/include
LOCAL_MODULE    := wrapper
LOCAL_SRC_FILES := wrapper.cpp
LOCAL_STATIC_LIBRARIES := libvalhalla_meili
include $(BUILD_SHARED_LIBRARY)

任何想法如何解决这个问题？我尝试过很多东西，但是所有这些都会导致更多（更加模糊）的错误，所以我希望有人能指出我正确的方向！

Answer 1

我发现了这个问题，但我希望我有一个更有见地的答案。显然，构建过程创建了两个库文件。我检查过的那个当然是ARM64。然而，我实际复制到Android设备的那个是x86。

因此，错误消息是正确的，库文件也是如此，但涉及的文件不止一个。如果您遇到同样的问题并且非常确定您的库是ARM64，请仔细检查实际上是否正在编译为ndk构建的文件！

如何在ndk-build期间解决“通用ELF中的重定位”？

1 个答案: