CodeBlocks新建GLUT 项目，测试程序出现 函数 undefined reference to ‘imp__glViewport’错误

codeBlocks配置好opengl 后新建一个 GLUT工程，会自动在main函数下生产一个测试程序。

如果出现编译错误，函数未定义

||=== Build: Debug in test3 (compiler: GNU GCC Compiler) ===|
obj\Debug\main.o||In function `resize':|
undefined reference to `_imp__glViewport'|
undefined reference to `_imp__glMatrixMode'|
undefined reference to `_imp__glLoadIdentity'|
undefined reference to `_imp__glFrustum'|
undefined reference to `_imp__glMatrixMode'|
undefined reference to `_imp__glLoadIdentity'|
 

解决办法，在代码第一行，加上宏定义 #define _STDCALL_SUPPORTED，代码前几行如下图

#define _STDCALL_SUPPORTED
#ifdef __APPLE__
#include <GLUT/glut.h>
#else
#include <GL/glut.h>
#endif

#include <stdlib.h>

static int slices = 16;
static int stacks = 16;

/* GLUT callback Handlers */

static void resize(int width, int height)
{
    const float ar = (float) width / (float) height;

    glViewport(0, 0, width, height);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glFrustum(-ar, ar, -1.0, 1.0, 2.0, 100.0);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity() ;
}

重新编译运行，结果如下图