c++ - clang++ 链接器架构 x86_64 的 undefined symbol

Question

$clang++ main.cpp -o out

出现如下错误，改成g++时出现同样的错误。我已经测试了一些简单的简单 C++ 代码，该命令工作正常。那么它是那个 PNG 类文件中的问题吗？然而，相同的文件以前在我的 MacOS 上运行，但今天突然失败了。

Undefined symbols for architecture x86_64:
"PNG::writeToFile(std::__1::basic_string<char, std::__1::char_traits<char>,   std::__1::allocator<char> > const&)", referenced from:
  _main in main-f6a06a.o
"PNG::PNG(std::__1::basic_string<char, std::__1::char_traits<char>,  std::__1::allocator<char> > const&)", referenced from:
  _main in main-f6a06a.o
"PNG::PNG(unsigned long, unsigned long)", referenced from:
  _main in main-f6a06a.o
"PNG::~PNG()", referenced from:
  _main in main-f6a06a.o
"PNG::operator()(unsigned long, unsigned long)", referenced from:
  _main in main-f6a06a.o
"PNG::width() const", referenced from:
  _main in main-f6a06a.o
 "PNG::height() const", referenced from:
  _main in main-f6a06a.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Answer 1

您是否错过了向链接器提供静态/共享以解决所提到方法的链接器错误的问题？另请注意，与 g++ 相比，clang++ 是不同的编译器，因此需要由您使用的同一编译器 (clang++) 预先编译的静态/共享库。