編譯C++應用程序時出現未定義的引用錯誤

Question

嘗試編譯C++程序時收到未定義的引用錯誤。我在使用-I和-L開關指向lib和include文件我的命令：

g++ -g -Wall -L/usr/local/lib/active -I/usr/local/include/active tutorial_01.cpp -o tutorial_01 

一些能幫我我缺少什麼嗎？

In file included from /usr/local/include/active/jaus/core/header.h:44:0, 
       from /usr/local/include/active/jaus/core/message.h:49, 
       from /usr/local/include/active/jaus/core/service.h:44, 
       from /usr/local/include/active/jaus/core/transport/transport.h:44, 
       from /usr/local/include/active/jaus/core/component.h:43, 
       from tutorial_01.cpp:42: 
/usr/local/include/active/jaus/core/address.h: In static member function ‘static bool JAUS::Address::IsReservedComponentID(JAUS::Byte)’: 
/usr/local/include/active/jaus/core/address.h:302:40: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] 
/usr/local/include/active/jaus/core/address.h:303:40: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] 
/tmp/cczAJw8H.o: In function `main': 
/home/reese/JAUS++-2.110519-src/libraries/jaus++/2.0/src/jaus/core/tutorial_01.cpp:58: undefined reference to `JAUS::Component::Component()' 
/home/reese/JAUS++-2.110519-src/libraries/jaus++/2.0/src/jaus/core/tutorial_01.cpp:78: undefined reference to `JAUS::Discovery::Name' 
/home/reese/JAUS++-2.110519-src/libraries/jaus++/2.0/src/jaus/core/tutorial_01.cpp:78: undefined reference to `JAUS::Component::GetService(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' 
/home/reese/JAUS++-2.110519-src/libraries/jaus++/2.0/src/jaus/core/tutorial_01.cpp:88: undefined reference to `JAUS::Discovery::SetSubsystemIdentification(JAUS::Subsystem::Type, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' 
/home/reese/JAUS++-2.110519-src/libraries/jaus++/2.0/src/jaus/core/tutorial_01.cpp:100: undefined reference to `JAUS::Component::Initialize(JAUS::Address const&, double)' 
/home/reese/JAUS++-2.110519-src/libraries/jaus++/2.0/src/jaus/core/tutorial_01.cpp:109: undefined reference to `CxUtils::Time::GetUtcTimeMs()' 
/home/reese/JAUS++-2.110519-src/libraries/jaus++/2.0/src/jaus/core/tutorial_01.cpp:122: undefined reference to `JAUS::Management::Name' 
/home/reese/JAUS++-2.110519-src/libraries/jaus++/2.0/src/jaus/core/tutorial_01.cpp:122: undefined reference to `JAUS::Component::GetService(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' 
/home/reese/JAUS++-2.110519-src/libraries/jaus++/2.0/src/jaus/core/tutorial_01.cpp:130: undefined reference to `CxUtils::Time::GetUtcTimeMs()' 
/home/reese/JAUS++-2.110519-src/libraries/jaus++/2.0/src/jaus/core/tutorial_01.cpp:136: undefined reference to `CxUtils::Time::GetUtcTimeMs()' 
/home/reese/JAUS++-2.110519-src/libraries/jaus++/2.0/src/jaus/core/tutorial_01.cpp:139: undefined reference to `CxUtils::GetChar()' 
/home/reese/JAUS++-2.110519-src/libraries/jaus++/2.0/src/jaus/core/tutorial_01.cpp:144: undefined reference to `CxUtils::SleepMs(unsigned int)' 
/home/reese/JAUS++-2.110519-src/libraries/jaus++/2.0/src/jaus/core/tutorial_01.cpp:150: undefined reference to `JAUS::Component::Shutdown()' 
/home/reese/JAUS++-2.110519-src/libraries/jaus++/2.0/src/jaus/core/tutorial_01.cpp:58: undefined reference to `JAUS::Component::~Component()' 
/home/reese/JAUS++-2.110519-src/libraries/jaus++/2.0/src/jaus/core/tutorial_01.cpp:58: undefined reference to `JAUS::Component::~Component()' 
collect2: ld returned 1 exit status 

Answer 1

的-L選項並沒有真正爲你做些什麼，除非你還使用-l與庫的名稱。我要帶你的庫命名爲libactive.a猜測，在這種情況下，你會想這樣做：

g++ -g -Wall -L/usr/local/lib/active -lactive -I/usr/local/include/active tutorial_01.cpp -o tutorial_01 

如果庫具有不同的名稱，你需要去改變它。

以下是規則：對於名爲/path/to/library/libmylibrary.a的庫，請使用以下命令行：-L/path/to/library -lmylibrary。