文章/答案/技术大牛

发布

社区首页 >问答首页 >编译时g++未定义的参考错误

问编译时g++未定义的参考错误
EN

Stack Overflow用户

提问于 2016-08-03 12:07:14

回答 2查看 3.9K关注 0票数 2

我试图在linux上编译我的程序。它在Windows上工作得很好(在Visual 2015下编译)。但是，当我试图在Linux上做同样的事情时，我会得到这样的错误：

g++ -std=c++0x -std=c++0x    Prueba1.cpp   -o Prueba1
/tmp/cc9HTgYi.o: In function `Escuchador::onFrame(Leap::Controller const&)':
Prueba1.cpp:(.text+0x51): undefined reference to `Leap::Controller::frame(int) const'
Prueba1.cpp:(.text+0x6c): undefined reference to `Leap::Frame::fingers() const'
Prueba1.cpp:(.text+0x7d): undefined reference to `Leap::FingerList::count() const'
Prueba1.cpp:(.text+0x97): undefined reference to `Leap::Frame::hands() const'
Prueba1.cpp:(.text+0xa8): undefined reference to `Leap::HandList::count() const'
Prueba1.cpp:(.text+0xbc): undefined reference to `Leap::Frame::timestamp() const'
Prueba1.cpp:(.text+0xce): undefined reference to `Leap::Frame::id() const'
Prueba1.cpp:(.text+0x1ac): undefined reference to `Leap::Frame::hands() const'
Prueba1.cpp:(.text+0x1c7): undefined reference to `Leap::HandList::begin() const'
Prueba1.cpp:(.text+0x203): undefined reference to `Leap::Hand::isLeft() const'
Prueba1.cpp:(.text+0x245): undefined reference to `Leap::Hand::id() const'
Prueba1.cpp:(.text+0x2fc): undefined reference to `Leap::Hand::palmNormal() const'
Prueba1.cpp:(.text+0x317): undefined reference to `Leap::Hand::direction() const'
Prueba1.cpp:(.text+0x332): undefined reference to `Leap::Hand::fingers() const'
Prueba1.cpp:(.text+0x34d): undefined reference to `Leap::FingerList::begin() const'
Prueba1.cpp:(.text+0x37e): undefined reference to `Leap::Pointable::id() const'
Prueba1.cpp:(.text+0x38e): undefined reference to `Leap::Finger::type() const'
Prueba1.cpp:(.text+0x47b): undefined reference to `Leap::Finger::bone(Leap::Bone::Type) const'
Prueba1.cpp:(.text+0x510): undefined reference to `Leap::Frame::hands() const'
Prueba1.cpp:(.text+0x533): undefined reference to `Leap::HandList::operator[](int) const'
Prueba1.cpp:(.text+0x54e): undefined reference to `Leap::Hand::fingers() const'
Prueba1.cpp:(.text+0x582): undefined reference to `Leap::FingerList::begin() const'
Prueba1.cpp:(.text+0x595): undefined reference to `Leap::Bone::Bone()'
Prueba1.cpp:(.text+0x5ea): undefined reference to `Leap::Finger::bone(Leap::Bone::Type) const'
Prueba1.cpp:(.text+0x63e): undefined reference to `Leap::Finger::type() const'
Prueba1.cpp:(.text+0x67f): undefined reference to `Leap::operator<<(std::ostream&, Leap::Bone const&)'
Prueba1.cpp:(.text+0x6ee): undefined reference to `Leap::FingerList::end() const'
Prueba1.cpp:(.text+0x726): undefined reference to `Leap::Hand::fingers() const'
Prueba1.cpp:(.text+0x74d): undefined reference to `Leap::FingerList::begin() const'
Prueba1.cpp:(.text+0x768): undefined reference to `Leap::FingerList::end() const'
Prueba1.cpp:(.text+0x7ab): undefined reference to `Leap::Finger::bone(Leap::Bone::Type) const'
Prueba1.cpp:(.text+0x7ce): undefined reference to `Leap::Finger::bone(Leap::Bone::Type) const'
Prueba1.cpp:(.text+0x7f1): undefined reference to `Leap::Finger::bone(Leap::Bone::Type) const'
Prueba1.cpp:(.text+0x814): undefined reference to `Leap::Finger::bone(Leap::Bone::Type) const'
Prueba1.cpp:(.text+0x825): undefined reference to `Leap::Finger::type() const'
Prueba1.cpp:(.text+0x848): undefined reference to `Leap::Bone::direction() const'
Prueba1.cpp:(.text+0x863): undefined reference to `Leap::Bone::direction() const'
Prueba1.cpp:(.text+0x89e): undefined reference to `Leap::Bone::direction() const'
Prueba1.cpp:(.text+0x8b9): undefined reference to `Leap::Bone::direction() const'
Prueba1.cpp:(.text+0x8f4): undefined reference to `Leap::Bone::direction() const'
/tmp/cc9HTgYi.o:Prueba1.cpp:(.text+0x90c): more undefined references to `Leap::Bone::direction() const' follow
/tmp/cc9HTgYi.o: In function `Escuchador::onFrame(Leap::Controller const&)':
Prueba1.cpp:(.text+0xa15): undefined reference to `Leap::Finger::type() const'
Prueba1.cpp:(.text+0xa37): undefined reference to `Leap::Bone::direction() const'
Prueba1.cpp:(.text+0xa4f): undefined reference to `Leap::Bone::direction() const'
Prueba1.cpp:(.text+0xa87): undefined reference to `Leap::Bone::direction() const'
Prueba1.cpp:(.text+0xa9f): undefined reference to `Leap::Bone::direction() const'
Prueba1.cpp:(.text+0xad7): undefined reference to `Leap::Bone::direction() const'
/tmp/cc9HTgYi.o:Prueba1.cpp:(.text+0xaef): more undefined references to `Leap::Bone::direction() const' follow
/tmp/cc9HTgYi.o: In function `Escuchador::onFrame(Leap::Controller const&)':
Prueba1.cpp:(.text+0xbf8): undefined reference to `Leap::Finger::type() const'
Prueba1.cpp:(.text+0xc1b): undefined reference to `Leap::Bone::direction() const'
Prueba1.cpp:(.text+0xc33): undefined reference to `Leap::Bone::direction() const'
Prueba1.cpp:(.text+0xc6b): undefined reference to `Leap::Bone::direction() const'
Prueba1.cpp:(.text+0xc83): undefined reference to `Leap::Bone::direction() const'
Prueba1.cpp:(.text+0xcbb): undefined reference to `Leap::Bone::direction() const'
/tmp/cc9HTgYi.o:Prueba1.cpp:(.text+0xcd3): more undefined references to `Leap::Bone::direction() const' follow
/tmp/cc9HTgYi.o: In function `Escuchador::onFrame(Leap::Controller const&)':
Prueba1.cpp:(.text+0xeb4): undefined reference to `Leap::FingerList::end() const'
Prueba1.cpp:(.text+0xf27): undefined reference to `Leap::HandList::end() const'
/tmp/cc9HTgYi.o: In function `main':
Prueba1.cpp:(.text+0x11a3): undefined reference to `Leap::Controller::Controller()'
Prueba1.cpp:(.text+0x11b7): undefined reference to `Leap::Controller::addListener(Leap::Listener&)'
Prueba1.cpp:(.text+0x11fb): undefined reference to `Leap::Controller::removeListener(Leap::Listener&)'
Prueba1.cpp:(.text+0x120c): undefined reference to `Leap::Controller::~Controller()'
Prueba1.cpp:(.text+0x122a): undefined reference to `Leap::Controller::~Controller()'
/tmp/cc9HTgYi.o: In function `Leap::Pointable::~Pointable()':
Prueba1.cpp:(.text._ZN4Leap9PointableD2Ev[_ZN4Leap9PointableD5Ev]+0x16): undefined reference to `Leap::Interface::~Interface()'
/tmp/cc9HTgYi.o: In function `Leap::Bone::operator=(Leap::Bone&&)':
Prueba1.cpp:(.text._ZN4Leap4BoneaSEOS0_[_ZN4Leap4BoneaSEOS0_]+0x14): undefined reference to `Leap::Interface::operator=(Leap::Interface const&)'
/tmp/cc9HTgYi.o: In function `Leap::ConstListIterator<Leap::HandList, Leap::Hand>::operator*() const':
Prueba1.cpp:(.text._ZNK4Leap17ConstListIteratorINS_8HandListENS_4HandEEdeEv[_ZNK4Leap17ConstListIteratorINS_8HandListENS_4HandEEdeEv]+0x20): undefined reference to `Leap::HandList::operator[](int) const'
/tmp/cc9HTgYi.o: In function `Leap::ConstListIterator<Leap::FingerList, Leap::Finger>::operator*() const':
Prueba1.cpp:(.text._ZNK4Leap17ConstListIteratorINS_10FingerListENS_6FingerEEdeEv[_ZNK4Leap17ConstListIteratorINS_10FingerListENS_6FingerEEdeEv]+0x20): undefined reference to `Leap::FingerList::operator[](int) const'
/tmp/cc9HTgYi.o: In function `Leap::Frame::~Frame()':
Prueba1.cpp:(.text._ZN4Leap5FrameD2Ev[_ZN4Leap5FrameD5Ev]+0x16): undefined reference to `Leap::Interface::~Interface()'
/tmp/cc9HTgYi.o: In function `Leap::HandList::~HandList()':
Prueba1.cpp:(.text._ZN4Leap8HandListD2Ev[_ZN4Leap8HandListD5Ev]+0x16): undefined reference to `Leap::Interface::~Interface()'
/tmp/cc9HTgYi.o: In function `Leap::FingerList::~FingerList()':
Prueba1.cpp:(.text._ZN4Leap10FingerListD2Ev[_ZN4Leap10FingerListD5Ev]+0x16): undefined reference to `Leap::Interface::~Interface()'
/tmp/cc9HTgYi.o: In function `Leap::Hand::~Hand()':
Prueba1.cpp:(.text._ZN4Leap4HandD2Ev[_ZN4Leap4HandD5Ev]+0x16): undefined reference to `Leap::Interface::~Interface()'
/tmp/cc9HTgYi.o: In function `Leap::Bone::~Bone()':
Prueba1.cpp:(.text._ZN4Leap4BoneD2Ev[_ZN4Leap4BoneD5Ev]+0x16): undefined reference to `Leap::Interface::~Interface()'
/tmp/cc9HTgYi.o:(.rodata._ZTIN4Leap5FrameE[_ZTIN4Leap5FrameE]+0x8): undefined reference to `typeinfo for Leap::Interface'
/tmp/cc9HTgYi.o:(.rodata._ZTIN4Leap8HandListE[_ZTIN4Leap8HandListE]+0x8): undefined reference to `typeinfo for Leap::Interface'
/tmp/cc9HTgYi.o:(.rodata._ZTIN4Leap10FingerListE[_ZTIN4Leap10FingerListE]+0x8): undefined reference to `typeinfo for Leap::Interface'
/tmp/cc9HTgYi.o:(.rodata._ZTIN4Leap4HandE[_ZTIN4Leap4HandE]+0x8): undefined reference to `typeinfo for Leap::Interface'
/tmp/cc9HTgYi.o:(.rodata._ZTIN4Leap4BoneE[_ZTIN4Leap4BoneE]+0x8): undefined reference to `typeinfo for Leap::Interface'
/tmp/cc9HTgYi.o:(.rodata._ZTIN4Leap9PointableE[_ZTIN4Leap9PointableE]+0x8): more undefined references to `typeinfo for Leap::Interface' follow
collect2: error: ld returned 1 exit status
make: *** [Prueba1] Error 1

我的#包括：

#include <iostream>
#include <cstring>
#include "Leap.h"

因此，问题似乎在于Leap.h头文件。在SDK中有一个我可以编译和运行的Sample.cpp。我使用相同的makefile和相同的文件系统；我使用与Sample.cpp相同的# .cpp文件，所以我将.cpp文件移动到Sample.cpp所在的同一个文件夹中，并尝试编译，并得到错误。我不知道怎么解决，有什么想法吗？下面是makefile：

OS := $(shell uname)
ARCH := $(shell uname -m)
CXXFLAGS := -std=c++0x -std=c++0x

ifeq ($(OS), Linux)
  ifeq ($(ARCH), x86_64)
LEAP_LIBRARY := ../lib/x64/libLeap.so -Wl,-rpath,../lib/x64
  else
LEAP_LIBRARY := ../lib/x86/libLeap.so -Wl,-rpath,../lib/x86
  endif
else
  # OS X
LEAP_LIBRARY := ../lib/libLeap.dylib
endif

Sample: Sample.cpp
$(CXX) -Wall  -g -I../include Sample.cpp -o Sample $(LEAP_LIBRARY)

ifeq ($(OS), Darwin)
install_name_tool -change @loader_path/libLeap.dylib ../lib/libLeap.dylib Sample
endif

clean:
rm -rf Sample Sample.dSYM

我添加CXXFLAGS只是为了解决C+98编译器错误。我也可以用这种方式编译Sample.cpp，但是当我试图对我的文件做同样的操作时，我会得到错误。谢谢你的帮助！

c++

linux

makefile

compiler-errors

回答 2

Stack Overflow用户

发布于 2016-08-03 12:58:42

因此，问题似乎在于Leap.h头文件。

不，头球没问题。您根本没有链接到提供这些函数定义的库。

看看makefile如何构建示例程序:它链接到libleap.so，

你也需要做同样的事情：

g++ -std=c++0x -std=c++0x    Prueba1.cpp   -o Prueba1 ../lib/x64/libleap.so -Wl,-rpath,../lib/x64

(如果您使用的是32位系统，则用x64替换x86 )。

票数 2

Stack Overflow用户

发布于 2016-08-03 13:52:52

首先，必需阅读：What is an undefined reference/unresolved external symbol error and how do I fix it?请至少阅读与外部库组件相关的答案，然后返回到这个问题。

好的，在您的示例中，您运行的是一个链接命令，而没有指定外部库。怎么会这样?为什么您能够编译包附带的示例？

看看makefile。上面写着

Sample: Sample.cpp
    $(CXX) -Wall  -g -I../include Sample.cpp -o Sample $(LEAP_LIBRARY)

这个规则告诉make三件事:构建什么(冒号之前的第一行)，从什么构建它(冒号之后)，以及如何构建它(第二行)。因此，当您运行一个命令时，如

make Sample

make非常清楚该做什么。

现在如果你说

make Prueba1

情况有点不同。makefile中没有关于Prueba1的特殊规则，因此make获取其(庞大的)内置规则集，并寻找允许它为您构建Prueba1的规则。确实存在这样一个内置规则，但它不了解libLeap.so。这就是为什么在构建日志中看不到它的原因。

当然，您可以在makefile中添加这样的内容：

Prueba1: Prueba1.cpp
    $(CXX) -Wall  -g -I../include Prueba1.cpp -o Prueba1 $(LEAP_LIBRARY)

但我冒昧地猜测，当您到达Prueba99时，它会变老一些。我们能做得更好吗？

是的，我们可以，但让我们先回答另一个问题。您的编译命令是如何知道-std=c++0x的？

这是因为您将此标志添加到内置宏CXXFLAGS中，而内置规则使用此宏。顺便说一下，您不需要两次指定-std=c++0x。

是否有一种方法来对待库类似于编译器标志？绝对一点儿没错!有两个内置于宏LDLIBS和LDFLAGS中。如果你这样定义它们：

LDLIBS := ../lib/x64/libLeap.so
LDFLAGS := -Wl,-rpath,../lib/x64

或(另一)

LDLIBS := -lLeap
LDFLAGS := -L ../lib/x64 -Wl,-rpath,../lib/x64

您的makefile应该能够针对C++构建任何libLeap程序(如果它是作为单个C++源文件编写的)。

将-I../include添加到CPPFLAGS可能是明智的，因为示例规则使用它。您的编译工作似乎没有它，但它可能会失败，如果您，例如，改变您的工作目录。

票数 1

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/38743212

复制

相似问题

问编译时g++未定义的参考错误
EN

回答 2

Stack Overflow用户

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问编译时g++未定义的参考错误EN

回答 2

Stack Overflow用户

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问编译时g++未定义的参考错误
EN