c++ - 用于架构x86_64的clang++链接器 undefined symbol

$clang++ main.cpp -o out

出现以下错误，更改为g++时也会发生相同的错误。我已经对一些简单的简单c++代码进行了测试，该命令可以正常工作。因此，该PNG类文件中的问题是什么？但是，相同的文件以前可以在我的MacOS上运行，但是今天突然失败了。

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)

最佳答案

您是否错过了为链接器提供静态/共享来解决链接器错误的方法？另请注意，与g++相比，clang++是不同的编译器，因此需要使用的同一编译器(clang++)事先编译静态/共享库。

关于c++ - 用于架构x86_64的clang++链接器 undefined symbol ，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/42991471/