警告：... / Android.mk：在连接标志非系统库 [英] WARNING: .../Android.mk: non-system libraries in linker flags
问题描述
我运行时得到这个警告 $ ANDROID_NDK_ROOT / NDK建造。该 Android.mk 如下。
I'm getting this warning while running $ANDROID_NDK_ROOT/ndk-build. The Android.mk is below.
$ $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，当我按照说明进行操作，并删除 -lcryptopp -lstlport_shared 从 LOCAL_LDLIBS ，然后我得到链接错误与符号从 libstlport_shared.so 。错误的样本如下所示的 Android.mk 文件之后。
However, when I follow the instructions and remove -lcryptopp -lstlport_shared from LOCAL_LDLIBS, then I get link errors related to symbols from libstlport_shared.so. A sample of the errors are shown below after the Android.mk file.
如何，究竟是否 NDK建造希望 Android.mk 设置？
How, exactly, does ndk-build want Android.mk set up?
为什么我一定要添加 $（STLPORT_INCL）到 LOCAL_C_INCLUDES 和 $ （STLPORT_LIB）到 LOCAL_LDFLAGS ？为什么 APP_STL：= stlport_shared 的没有的设置STL正确的开箱即用
Why do I have to add $(STLPORT_INCL) to LOCAL_C_INCLUDES, and $(STLPORT_LIB) to LOCAL_LDFLAGS? Why does APP_STL := stlport_shared not setup the STL correctly out of the box?
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)
下面是当试图通过删除我的本地库照做错误的样本 LOCAL_LDLIBS ：
$ $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()'
...
推荐答案
我除preT消息为警告，您不使用默认的系统库（在在连接标志非系统库 usr / lib目录），这可能是完全正常的，但也可能导致错误（不同的库版本之间的不兼容）。无论此警告的错误，你是完全取决于你。
I interpret the "non-system libraries in linker flags" message as a warning that you're not using the default system libraries (in usr/lib) which may be perfectly fine, but which could also lead to errors (incompatibility between different libraries versions). Whether this warning bugs you is completely up to you.
然后，你试图解决它的方式，我觉得你用错误的NDK的 LOCAL_SHARED_LIBRARIES 变量。
Then, about the way you tried to solve it, I think you're using wrongly the LOCAL_SHARED_LIBRARIES variable of the NDK.
我贴在这里的样品从我的 Android.mk 文件，它使用Assimp之一
I paste here a sample from one of my Android.mk file which uses Assimp
#------------------------------------------------------------------ Assimp
include $(CLEAR_VARS)
LOCAL_MODULE := Assimp
LOCAL_EXPORT_C_INCLUDES := $(GENERATED_INCLUDE_PATH)/assimp/include
LOCAL_SRC_FILES := $(GENERATED_PATH)/assimp/lib/libassimp.a
include $(PREBUILT_STATIC_LIBRARY)
...
LOCAL_STATIC_LIBRARIES := \
Assimp \
<Your other libs here>
正如你所看到的，我宣布一个 LOCAL_MODULE 使用自定义名称，设置几个变量，然后包括 preBUILT_STATIC_LIBRARY 脚本，它告诉NDK使用这个库。
As you can see, I declare a LOCAL_MODULE with a custom name, set up a few variables and then include the PREBUILT_STATIC_LIBRARY script which tells the NDK to use this lib.
然后在 LOCAL_STATIC_LIBRARIES 我列出库我使用与模块名，不作为，如果这是一个链接器标志像你这样做在这里。
Then in LOCAL_STATIC_LIBRARIES I list the libraries I use with their module name, not as if this was a linker flag like you're doing here.
在你的情况，我相信你应该做到以下几点，例如用于STL
In your case, I believe you should do the following, for example for the stl
include $(CLEAR_VARS)
LOCAL_MODULE := STLPortShared
LOCAL_EXPORT_C_INCLUDES := <path to stlport includes>
LOCAL_SRC_FILES := <path to stlport library>
include $(PREBUILT_SHARED_LIBRARY)
...
#Notice the name, identical to the one specified for LOCAL_MODULE
LOCAL_SHARED_LIBRARIES = STLPortShared
我想这应该这样做。当然，重复上述过程，每个库导致的麻烦，也不要忘了包括（CLEAR_VARS）每个LIB规范之间的。
I think this should do it. Of course, repeat the process for each libs that causes trouble, and don't forget the include(CLEAR_VARS) between each lib specification.
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