GLEW-为什么要定义GLEW_STATIC? [英] GLEW - why should I define GLEW_STATIC?

问题描述

我正在为GLEW使用静态链接库，因此必须定义GLEW_STATIC来编译使用GLEW的程序.但是我从来不明白为什么这样做是必要的.有人可以解释原因吗?

I am using a statically linked library for GLEW and therefore I have to define GLEW_STATIC to compile my programs that are using GLEW. But I have never understood why this is necessary. So could anyone explain the reason?

推荐答案

由静态库导出或从静态库导入的函数的签名用关键字 extern __declspec(dllimport) . GLEW_STATIC是激活第一种情况的预处理器定义.

The signature of a function which is exported by or imported from a static library is marked by the keyword export. A function which is imported from a dynamic library has to be marked by extern __declspec(dllimport). GLEW_STATIC is a preprocessor definition which activates the first case.

"glew.h"文件(版本2.1.0)中的相关代码部分为:

The relevant code part in the "glew.h" file (verison 2.1.0) is:

/*
 * GLEW_STATIC is defined for static library.
 * GLEW_BUILD  is defined for building the DLL library.
 */

#ifdef GLEW_STATIC
  define GLEWAPI extern
#else
  ifdef GLEW_BUILD
    define GLEWAPI extern __declspec(dllexport)
  else
    define GLEWAPI extern __declspec(dllimport)
  endif
#endif

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