ndk-build：静态链接到 libxml.a 时出现未定义引用 .. 错误

当我使用 ndk-build 工具编译单个 C++ 源文件时，出现很多 undefined reference to ... 错误。根据记录，我在 Linux 主机系统上使用 NDK r6。

首先，我一整天都在绞尽脑汁地解决这个问题，所以如果我遗漏了一些东西或者解释得太快了，我很抱歉。请向我询问任何其他信息。

我的源代码有很多我想要静态链接的依赖库。 我在 Android.mk 文件中定义了所有不同的依赖库，如下所示：

include $(CLEAR_VARS)

LOCAL_MODULE    := <name>
LOCAL_SRC_FILES := lib<name>.a
LOCAL_EXPORT_C_INCLUDES := <header files related to this lib>

include $(PREBUILT_STATIC_LIBRARY)

虽然我确保这些文件在我的 jni/ 文件夹中可以作为 lib.a 与我的 Android.mk 和 Application.mk 文件一起使用。 （和我的源文件） 我还通过添加添加了 STL 支持APP_STL := stlport_static到我的 Application.mk 文件。 我的单个源文件（riidr-jni.cpp）目前是：

#include <string>
#include <jni.h>
#include <android/log.h>
#include "../com_riidr_apps_reader_RiidrEbookReaderActivity.h"
#include <dp_all.h>

void Java_com_riidr_apps_reader_RiidrEbookReaderActivity_init ( JNIEnv* env, jobject thiz ) {
    __android_log_write(ANDROID_LOG_INFO, "Riidr", "JNI init - start");
    dp::platformInit( dp::PI_DEFAULT );
}

如果我取消注释dp::platformInit( dp::PI_DEFAULT );行并将其替换为std::string test = "asd";我完全没有错误，这让我相信 STL 库已正确导入和链接。

我的 Android.mk 文件的最后指令是这样的

include $(CLEAR_VARS)

LOCAL_MODULE    := riidr-jni
LOCAL_SRC_FILES := riidr-jni.cpp
LOCAL_LDLIBS := -llog -ldl -lz
LOCAL_STATIC_LIBRARIES :=  \
hobbes \
dp \
adept \
mschema \
hobbes \
t3 \
xml \
mschema \
dp \
adept \
xml \
cryptopenssl \
fonts \
png \
jpeg \
ssl \
crypto \
expat \
cts \
hyphen \
curl

include $(BUILD_SHARED_LIBRARY)

运行 ndk-build 工具时出现的错误如下：

/home/creen/Projects/Riidr/workspace/RiidrEbookReader/obj/local/armeabi/libxml.a(xpath_context.o)：在函数中std::_Rb_tree_iterator<std::pair<uft::Value const, xpath::DynamicContext*> >::operator++()': xpath_context.cpp:(.text._ZNSt17_Rb_tree_iteratorISt4pairIKN3uft5ValueEPN5xpath14DynamicContextEEEppEv[std::_Rb_tree_iterator<std::pair<uft::Value const, xpath::DynamicContext*> >::operator++()]+0x1c): undefined reference tostd::_Rb_tree_increment(std::_Rb_tree_node_base*)' /home/creen/Projects/Riidr/workspace/RiidrEbookReader/obj/local/armeabi/libxml.a(xpath_context.o)：在函数中std::_Rb_tree<uft::Value, std::pair<uft::Value const, xpath::DynamicContext*>, std::_Select1st<std::pair<uft::Value const, xpath::DynamicContext*> >, xpath::Context::ValueCompare, std::allocator<std::pair<uft::Value const, xpath::DynamicContext*> > >::erase(std::_Rb_tree_iterator<std::pair<uft::Value const, xpath::DynamicContext*> >)': xpath_context.cpp:(.text._ZNSt8_Rb_treeIN3uft5ValueESt4pairIKS1_PN5xpath14DynamicContextEESt10_Select1stIS7_ENS4_7Context12ValueCompareESaIS7_EE5eraseESt17_Rb_tree_iteratorIS7_E[std::_Rb_tree<uft::Value, std::pair<uft::Value const, xpath::DynamicContext*>, std::_Select1st<std::pair<uft::Value const, xpath::DynamicContext*> >, xpath::Context::ValueCompare, std::allocator<std::pair<uft::Value const, xpath::DynamicContext*> > >::erase(std::_Rb_tree_iterator<std::pair<uft::Value const, xpath::DynamicContext*> >)]+0x28): undefined reference tostd::_Rb_tree_rebalance_for_erase(std::_Rb_tree_node_base*, std::_Rb_tree_node_base&)' /home/creen/Projects/Riidr/workspace/RiidrEbookReader/obj/local/armeabi/libxml.a(xpath_context.o)：在函数中std::_Rb_tree<uft::Value, std::pair<uft::Value const, xpath::DynamicContext*>, std::_Select1st<std::pair<uft::Value const, xpath::DynamicContext*> >, xpath::Context::ValueCompare, std::allocator<std::pair<uft::Value const, xpath::DynamicContext*> > >::_M_insert_(std::_Rb_tree_node_base const*, std::_Rb_tree_node_base const*, std::pair<uft::Value const, xpath::DynamicContext*> const&)': xpath_context.cpp:(.text._ZNSt8_Rb_treeIN3uft5ValueESt4pairIKS1_PN5xpath14DynamicContextEESt10_Select1stIS7_ENS4_7Context12ValueCompareESaIS7_EE10_M_insert_EPKSt18_Rb_tree_node_baseSG_RKS7_[std::_Rb_tree<uft::Value, std::pair<uft::Value const, xpath::DynamicContext*>, std::_Select1st<std::pair<uft::Value const, xpath::DynamicContext*> >, xpath::Context::ValueCompare, std::allocator<std::pair<uft::Value const, xpath::DynamicContext*> > >::_M_insert_(std::_Rb_tree_node_base const*, std::_Rb_tree_node_base const*, std::pair<uft::Value const, xpath::DynamicContext*> const&)]+0xc4): undefined reference tostd::_Rb_tree_insert_and_rebalance(bool, std::_Rb_tree_node_base*, std::_Rb_tree_node_base*, std::_Rb_tree_node_base&)' /home/creen/Projects/Riidr/workspace/RiidrEbookReader/obj/local/armeabi/libxml.a(xpath_context.o)：在函数中std::_Rb_tree_const_iterator<std::pair<uft::Value const, xpath::DynamicContext*> >::operator--()': xpath_context.cpp:(.text._ZNSt23_Rb_tree_const_iteratorISt4pairIKN3uft5ValueEPN5xpath14DynamicContextEEEmmEv[std::_Rb_tree_const_iterator<std::pair<uft::Value const, xpath::DynamicContext*> >::operator--()]+0x1c): undefined reference tostd::_Rb_tree_decrement(std::_Rb_tree_node_base const*)' /home/creen/Projects/Riidr/workspace/RiidrEbookReader/obj/local/armeabi/libxml.a(xpath_context.o)：在函数中std::_Rb_tree_const_iterator<std::pair<uft::Value const, xpath::DynamicContext*> >::operator++()': xpath_context.cpp:(.text._ZNSt23_Rb_tree_const_iteratorISt4pairIKN3uft5ValueEPN5xpath14DynamicContextEEEppEv[std::_Rb_tree_const_iterator<std::pair<uft::Value const, xpath::DynamicContext*> >::operator++()]+0x1c): undefined reference tostd::_Rb_tree_increment(std::_Rb_tree_node_base const*)' /home/creen/Projects/Riidr/workspace/RiidrEbookReader/obj/local/armeabi/libxml.a(xpath_context.o)：在函数中__gnu_cxx::new_allocator<mdom::Node*>::allocate(unsigned int, void const*)': xpath_context.cpp:(.text._ZN9__gnu_cxx13new_allocatorIPN4mdom4NodeEE8allocateEjPKv[__gnu_cxx::new_allocator<mdom::Node*>::allocate(unsigned int, void const*)]+0x4c): undefined reference tostd::__throw_bad_alloc()' /home/creen/Projects/Riidr/workspace/RiidrEbookReader/obj/local/armeabi/libxml.a(xpath_context.o)：在函数中__gnu_cxx::new_allocator<mdom::Node>::allocate(unsigned int, void const*)': xpath_context.cpp:(.text._ZN9__gnu_cxx13new_allocatorIN4mdom4NodeEE8allocateEjPKv[__gnu_cxx::new_allocator<mdom::Node>::allocate(unsigned int, void const*)]+0x4c): undefined reference tostd::__throw_bad_alloc()' /home/creen/Projects/Riidr/workspace/RiidrEbookReader/obj/local/armeabi/libxml.a(xpath_context.o)：在函数中std::_Rb_tree_iterator<std::pair<uft::Value const, xpath::DynamicContext*> >::operator--()': xpath_context.cpp:(.text._ZNSt17_Rb_tree_iteratorISt4pairIKN3uft5ValueEPN5xpath14DynamicContextEEEmmEv[std::_Rb_tree_iterator<std::pair<uft::Value const, xpath::DynamicContext*> >::operator--()]+0x1c): undefined reference tostd::_Rb_tree_decrement(std::_Rb_tree_node_base*)' /home/creen/Projects/Riidr/workspace/RiidrEbookReader/obj/local/armeabi/libxml.a(xpath_context.o)：在函数中std::deque<mdom::Node, std::allocator<mdom::Node> >::_M_new_elements_at_front(unsigned int)': xpath_context.cpp:(.text._ZNSt5dequeIN4mdom4NodeESaIS1_EE24_M_new_elements_at_frontEj[std::deque<mdom::Node, std::allocator<mdom::Node> >::_M_new_elements_at_front(unsigned int)]+0x58): undefined reference tostd::__throw_length_error(char const*)' /home/creen/Projects/Riidr/workspace/RiidrEbookReader/obj/local/armeabi/libxml.a(xpath_context.o)：在函数中std::deque<mdom::Node, std::allocator<mdom::Node> >::_M_new_elements_at_back(unsigned int)': xpath_context.cpp:(.text._ZNSt5dequeIN4mdom4NodeESaIS1_EE23_M_new_elements_at_backEj[std::deque<mdom::Node, std::allocator<mdom::Node> >::_M_new_elements_at_back(unsigned int)]+0x58): undefined reference tostd::__throw_length_error(char const*)' /home/creen/Projects/Riidr/workspace/RiidrEbookReader/obj/local/armeabi/libxml.a(xpath_context.o)：在函数中__gnu_cxx::new_allocator<std::_Rb_tree_node<std::pair<uft::Value const, xpath::DynamicContext*> > >::allocate(unsigned int, void const*)': xpath_context.cpp:(.text._ZN9__gnu_cxx13new_allocatorISt13_Rb_tree_nodeISt4pairIKN3uft5ValueEPN5xpath14DynamicContextEEEE8allocateEjPKv[__gnu_cxx::new_allocator<std::_Rb_tree_node<std::pair<uft::Value const, xpath::DynamicContext*> > >::allocate(unsigned int, void const*)]+0x4c): undefined reference tostd::__throw_bad_alloc()' /home/creen/Projects/Riidr/workspace/RiidrEbookReader/obj/local/armeabi/libxml.a(xpath_yacc.o)：在函数中std::list<uft::Value*, std::allocator<uft::Value*> >::_M_insert(std::_List_iterator<uft::Value*>, uft::Value* const&)': xpath_yacc.cpp:(.text._ZNSt4listIPN3uft5ValueESaIS2_EE9_M_insertESt14_List_iteratorIS2_ERKS2_[std::list<uft::Value*, std::allocator<uft::Value*> >::_M_insert(std::_List_iterator<uft::Value*>, uft::Value* const&)]+0x3c): undefined reference tostd::_List_node_base::hook(std::_List_node_base*)' /home/creen/Projects/Riidr/workspace/RiidrEbookReader/obj/local/armeabi/libxml.a(xpath_yacc.o)：在函数中__gnu_cxx::new_allocator<std::_List_node<uft::Value*> >::allocate(unsigned int, void const*)': xpath_yacc.cpp:(.text._ZN9__gnu_cxx13new_allocatorISt10_List_nodeIPN3uft5ValueEEE8allocateEjPKv[__gnu_cxx::new_allocator<std::_List_node<uft::Value*> >::allocate(unsigned int, void const*)]+0x4c): undefined reference tostd::__throw_bad_alloc()' Collect2: ld 返回 1 退出状态 制作：*[/home/creen/Projects/Riidr/workspace/RiidrEbookReader/obj/local/armeabi/libriidr-jni.so] 错误 1

任何信息、问题或任何事情都非常感谢。

添加行

LOCAL_ALLOW_UNDEFINED_SYMBOLS := true

到 Android.mk 文件，它应该可以工作。 正如 ndk 文档中所解释的，这是因为 ndk 甚至为了避免运行时链接错误而执行调试检查，并且出于某些动机，它在预构建的库中找不到正确的引用。希望它能有所帮助。