在运行$ANDROID_NDK_ROOT/ndk-build
时,我收到了这个警告。以下是Android.mk
的内容。
$ $ANDROID_NDK_ROOT/ndk-build
WARNING:/Users/jwalton/Android-CryptoPP/jni/Android.mk:prng:
non-system libraries in linker flags: -lcryptopp -lstlport_shared
This is likely to result in incorrect builds. Try using LOCAL_STATIC_LIBRARIES
or LOCAL_SHARED_LIBRARIES instead to list the library dependencies of the
current module
...
然而,当我按照说明从LOCAL_LDLIBS中删除-lcryptopp -lstlport_shared时,我会得到与libstlport_shared.so相关的符号链接错误。以下是Android.mk文件后显示的错误示例。
那么,ndk-build对Android.mk有什么具体要求呢?
为什么我必须将$(STLPORT_INCL)添加到LOCAL_C_INCLUDES,并将$(STLPORT_LIB)添加到LOCAL_LDFLAGS呢?为什么APP_STL := stlport_shared不能立即正确设置STL?
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
TARGET_ARCH_ABI := armeabi
TARGET_ABI := android-9-armeabi
CRYPTOPP_INCL := /usr/local/cryptopp-android-9/include
CRYPTOPP_LIB := /usr/local/cryptopp-android-9/lib
STLPORT_INCL := /opt/android-ndk-r9/sources/cxx-stl/stlport/stlport
STLPORT_LIB := /opt/android-ndk-r9/sources/cxx-stl/stlport/libs/armeabi
APP_STL := stlport_shared
APP_MODULES := stlport_shared cryptopp
LOCAL_CPP_FEATURES := rtti exceptions
LOCAL_C_INCLUDES := $(CRYPTOPP_INCL) $(CRYPTOPP_INCL)/cryptopp $(STLPORT_INCL)
LOCAL_LDFLAGS := -L $(CRYPTOPP_LIB) -L $(STLPORT_LIB)
LOCAL_LDLIBS := -lcryptopp -lstlport_shared -llog -landroid
# LOCAL_LDLIBS := -llog -landroid
# LOCAL_SHARED_LIBRARIES := -lcryptopp -lstlport_shared
LOCAL_MODULE := prng
LOCAL_SRC_FILES := libprng.cpp
include $(BUILD_SHARED_LIBRARY)
当尝试按照建议从LOCAL_LDLIBS
中删除本地库时,以下是错误示例:
$ $ANDROID_NDK_ROOT/ndk-build
Android NDK: WARNING: APP_PLATFORM android-14 is larger than android:minSdkVersion 9 in /Users/jwalton/Android-CryptoPP/AndroidManifest.xml
Gdbserver : [arm-linux-androideabi-4.6] libs/armeabi/gdbserver
Gdbsetup : libs/armeabi/gdb.setup
Compile++ thumb : prng <= libprng.cpp
SharedLibrary : libprng.so
/opt/android-ndk-r9/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: /Users/jwalton/Android-CryptoPP/obj/local/armeabi/objs-debug/prng/libprng.o: in function std::__node_alloc::allocate(unsigned int&):/opt/android-ndk-r9/sources/cxx-stl/stlport/stlport/stl/_alloc.h:158: error: undefined reference to 'std::__node_alloc::_M_allocate(unsigned int&)'
/opt/android-ndk-r9/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: /Users/jwalton/Android-CryptoPP/obj/local/armeabi/objs-debug/prng/libprng.o: in function std::__node_alloc::deallocate(void*, unsigned int):/opt/android-ndk-r9/sources/cxx-stl/stlport/stlport/stl/_alloc.h:161: error: undefined reference to 'std::__node_alloc::_M_deallocate(void*, unsigned int)'
/opt/android-ndk-r9/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: /Users/jwalton/Android-CryptoPP/obj/local/armeabi/objs-debug/prng/libprng.o: in function std::ios_base::_M_check_exception_mask():/opt/android-ndk-r9/sources/cxx-stl/stlport/stlport/stl/_ios_base.h:193: error: undefined reference to 'std::ios_base::_M_throw_failure()'
...
LOCAL_EXPORT_C_INCLUDES := <path to stlport includes>
。Android提供了该库。他们提供了一个糟糕的构建系统。应该像--sysroot
一样包含这个东西。相反,他们让开发者受尽折磨。而且他们隐藏了输出,所以你甚至看不到实验结果,试图让这个东西工作起来。 - jwwApplication.mk
中添加一个APP_STL=gnustl_shared
... - JBLndk-build
中的V=1
参数。 - Alex Cohn