Question

我从项目中删除了所有类，这样就留下了三个错误：

error_code.hpp:222: undefined reference to `boost::system::generic_category()

使用Netbeans IDE
点击文件 - ＆gt;项目属性 - ＆gt;链接
在Libraries旁边，添加了libboost_system.so

摆脱了对boost :: system :: generic_category（）

的三个未定义的引用

现在它给出了：

CLEAN SUCCESSFUL (total time: 123ms)
cd '/home/michaeleric/NetBeansProjects/NNW'
/usr/bin/make -f Makefile CONF=Debug
"/usr/bin/make" -f nbproject/Makefile-Debug.mk QMAKE= SUBPROJECTS= .build-conf
make[1]: Entering directory `/home/michaeleric/NetBeansProjects/NNW'
"/usr/bin/make"  -f nbproject/Makefile-Debug.mk dist/Debug/GNU-Linux/nnw
make[2]: Entering directory `/home/michaeleric/NetBeansProjects/NNW'
mkdir -p build/Debug/GNU-Linux/_ext/d028d44d
rm -f "build/Debug/GNU-Linux/_ext/d028d44d/CGrid.o.d"
g++    -c -g -MMD -MP -MF "build/Debug/GNU-Linux/_ext/d028d44d/CGrid.o.d" -o build/Debug/GNU-Linux/_ext/d028d44d/CGrid.o ../../Desktop/NN_22_05_17/CGrid.cpp
mkdir -p dist/Debug/GNU-Linux
g++     -o dist/Debug/GNU-Linux/nnw build/Debug/GNU-Linux/_ext/d028d44d/CGrid.o -L/usr/include/boost -lboost_system
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crt1.o: In function `_start':
collect2: error: ld returned 1 exit status
make[2]: *** [dist/Debug/GNU-Linux/nnw] Error 1
make[2]: Leaving directory `/home/michaeleric/NetBeansProjects/NNW'
make[1]: *** [.build-conf] Error 2
make[1]: Leaving directory `/home/michaeleric/NetBeansProjects/NNW'
make: *** [.build-impl] Error 2

BUILD FAILED (exit value 2, total time: 6s)

这个错误是什么意思以及如何修复？

休息所需的课程

#include </usr/include/boost/thread/thread.hpp>
#include </usr/include/boost/thread/xtime.hpp>

#include </usr/include/boost/iostreams/write.hpp>

#define byte unsigned char
#define Thread boost::thread

class CGrid
{

    Thread* GetThread();

    bool SetThread(Thread* thread);

};

Answer 1

如果我用

编译它

/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'

我得到了相同的链接器错误

main

但是，如果我添加一个空的#define函数，它编译得很好。（我还用typedef替换了你丑陋的#include </usr/include/boost/thread/thread.hpp> #include </usr/include/boost/thread/xtime.hpp> #include </usr/include/boost/iostreams/write.hpp> typedef unsigned char byte; typedef boost::thread Thread; class CGrid { Thread* GetThread(); bool SetThread(Thread* thread); }; int main() {}替换。）

main

如果这是一个目标文件而-c在另一个翻译单元中，请使用g++ -c test.cpp -lboost_system参数进行编译：

class Foo(Base):
    __tablename__ = 'foo'

    can_be_deleted = Column(Boolean, default=False)
    bar = Column(
        GUID(), ForeignKey('bar.id', ondelete="CASCADE")
    )

在netbeans中提升lib错误

1 个答案: