由于 SFML 框架导致 OS X 上的链接器错误

Question

这似乎是一个相当“菜鸟”的问题：我已经下载了适用于 Mac 的 SFML-1.6，并将框架放入我的 /Library/Frameworks 文件夹。在尝试编译示例 SFML 应用程序后，我几乎每次调用 SFML 都会遇到链接器错误。我不确定我错过了什么？我对 OSX 和框架没有太多经验，所以也许我需要通过其他方法链接到库？

输出，如果有帮助的话：

Undefined symbols for architecture x86_64:
  "sf::VideoMode::VideoMode(unsigned int, unsigned int, unsigned int)", referenced from:
      osx_init::init() in osx_init.o
  "sf::RenderWindow::RenderWindow(sf::VideoMode, std::string const&, unsigned long, sf::WindowSettings const&)", referenced from:
      osx_init::init() in osx_init.o
  "sf::RenderTarget::PreserveOpenGLStates(bool)", referenced from:
      osx_init::init() in osx_init.o
  "sf::Image::Image()", referenced from:
      osx_init::init() in osx_init.o
  "sf::Image::LoadFromFile(std::string const&)", referenced from:
      osx_init::init() in osx_init.o
  "sf::Color::Color(unsigned char, unsigned char, unsigned char, unsigned char)", referenced from:
      osx_init::init() in osx_init.o
  "sf::Sprite::Sprite(sf::Image const&, sf::Vector2<float> const&, sf::Vector2<float> const&, float, sf::Color const&)", referenced from:
      osx_init::init() in osx_init.o
  "sf::Image::GetWidth() const", referenced from:
      osx_init::init() in osx_init.o
  "sf::Image::GetHeight() const", referenced from:
      osx_init::init() in osx_init.o
  "sf::Image::GetPixelsPtr() const", referenced from:
      osx_init::init() in osx_init.o
  "sf::Image::~Image()", referenced from:
      osx_init::init() in osx_init.o
  "sf::Clock::Clock()", referenced from:
      osx_init::init() in osx_init.o
  "sf::Window::IsOpened() const", referenced from:
      osx_init::init() in osx_init.o
  "sf::Window::GetEvent(sf::Event&)", referenced from:
      osx_init::init() in osx_init.o
  "sf::Window::Close()", referenced from:
      osx_init::init() in osx_init.o
  "sf::Clock::GetElapsedTime() const", referenced from:
      osx_init::init() in osx_init.o
  "sf::Unicode::Text::Text(char const*)", referenced from:
      osx_init::init() in osx_init.o
  "sf::Font::GetDefaultFont()", referenced from:
      osx_init::init() in osx_init.o
  "sf::String::String(sf::Unicode::Text const&, sf::Font const&, float)", referenced from:
      osx_init::init() in osx_init.o
  "sf::Drawable::SetPosition(float, float)", referenced from:
      osx_init::init() in osx_init.o
  "sf::Drawable::SetColor(sf::Color const&)", referenced from:
      osx_init::init() in osx_init.o
  "sf::Window::Display()", referenced from:
      osx_init::init() in osx_init.o
  "sf::RenderWindow::~RenderWindow()", referenced from:
      osx_init::init() in osx_init.o
  "vtable for sf::Sprite", referenced from:
      sf::Sprite::~Sprite() in osx_init.o
  "sf::Drawable::~Drawable()", referenced from:
      sf::Sprite::~Sprite() in osx_init.o
      sf::String::~String() in osx_init.o
  "vtable for sf::String", referenced from:
      sf::String::~String() in osx_init.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

您需要在链接器选项中添加两个标志：

-framework SFML

这告诉链接器使用/Library/Frameworks/SFML.framework中的框架

此外，您必须为您正在使用的每个库添加-lsfml-whatever：

-lsfml-system
-lsfml-window
-lsfml-graphics
-lsfml-audio
-lsfml-network

因此，完整的链接器行可能如下所示：

g++ -framework SFML -lsfml-graphics -lsfml-audio -lsfml-window -lsfml-system

这在 Mac OSX SFML 构建文档中并不是很明显，但您确实需要两者。

Answer 2

似乎您的问题也可以从 OS X 上的经验丰富的开发人员那里得到解答，但由于这也是一个与 SFML 相关的问题，我建议您与开发人员联系（或者至少他移植了整个事情）用于 OS X 的 SFML：hirua。 （或者他也在 Stackoverflow 上？）

此外，论坛中还有一个instruction 用于构建（和使用）SFML 2.0 库。也许它对您的 1.6 版本也有帮助。

（我想添加这只是一条评论，但我的名声似乎不是那么好（还））