Question

当我尝试编译程序（测试我的lib）时，每个被调用的方法都有未定义的引用。我已阅读“gcc undefined reference to”的答案，但它没有帮助。 PS我使用：Debian 7.2.0和C ++ 11标准。

#include <RFw/String.hpp>
#include <stdio.h>
using namespace RFw;

int main() {
Array<char> _arr_ (5);

_arr_[0] = 'b';
_arr_[1] = 'c';

printf("%c%c\n", _arr_[0], _arr_[2]);

printf(RFw::getVersion());

return 0;
}

Makefile目标：

test:
    c++ test.cpp -I./include-core/ -o bin/test -L./bin -l${core_NAME_ROOT}

控制台输出：

test.cpp:13:9: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
        printf(RFw::getVersion());
               ^~~~~~~~~~~~~~~~~
1 warning generated.
/tmp/test-lxdZF4.o: In function `main':
test.cpp:(.text+0x20): undefined reference to `RFw::Array<char>::Array(int)'
test.cpp:(.text+0x33): undefined reference to `RFw::Array<char>::operator[](int)'
test.cpp:(.text+0x54): undefined reference to `RFw::Array<char>::operator[](int)'
test.cpp:(.text+0x75): undefined reference to `RFw::Array<char>::operator[](int)'
test.cpp:(.text+0x99): undefined reference to `RFw::Array<char>::operator[](int)'
test.cpp:(.text+0xff): undefined reference to `RFw::Array<char>::~Array()'
test.cpp:(.text+0x11a): undefined reference to `RFw::Array<char>::~Array()'
./bin/libregemfw0.1-core.so: undefined reference to `RFw::Array<char>::operator[](int) const'
./bin/libregemfw0.1-core.so: undefined reference to `RFw::Array<char>::Array(int)'
./bin/libregemfw0.1-core.so: undefined reference to `RFw::Array<char>::getLength() const'
./bin/libregemfw0.1-core.so: undefined reference to `RFw::Exception::onThrow()'
./bin/libregemfw0.1-core.so: undefined reference to `RFw::Array<char>::resize(int)'
./bin/libregemfw0.1-core.so: undefined reference to `RFw::Array<char>::addElementOnEnd(char)'
./bin/libregemfw0.1-core.so: undefined reference to `vtable for RFw::Object'
./bin/libregemfw0.1-core.so: undefined reference to `typeinfo for RFw::Object'
./bin/libregemfw0.1-core.so: undefined reference to `RFw::Object::~Object()'
./bin/libregemfw0.1-core.so: undefined reference to `RFw::Array<char>::~Array()'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [test] Ошибка 1

Answer 1

问题在于

c++ test.cpp -I./include-core/ -o bin/test -L./bin -l${core_NAME_ROOT}c++ test.cpp -I./include-core/ -o bin/test -L./bin -l${core_NAME_ROOT}

将首先处理库，然后处理.cpp文件。处理库时，会解析引用的符号（＆＃34;链接＆＃34;）并且库中不需要的所有未解析的符号都将被丢弃。这意味着只要处理.cpp文件，这些符号就会被拒绝。您在命令行中有两次库，但第二个被忽略，因为库已经处理过了。

您应该始终将库（一次）放在编译器命令行的末尾：

c++ test.cpp -I./include-core/ -o bin/test test.cpp -L./bin -l${core_NAME_ROOT}

未定义的<function name =“”> </function>参考

1 个答案: