Qt Creator 中的 Glew 链接问题？
我试图通过 QMake 文件在 Qt Creator 中链接 GLEW（与 SDL 和 OpenGL - 注意，不是 SDL 的 OpenGL 实现），尽管我运气不佳。无论我尝试什么，我似乎都会遇到相同的字符串错误，这些错误处理源自一些 typedef 的冲突声明问题。我想知道为什么会发生这种情况，以及可以采取什么措施。
示例
/usr/include/SDL/SDL_opengl.h:4855: error: conflicting declaration ‘typedef void (* PFNGLFRAGMENTLIGHTFVSGIXPROC)(GLenum, GLenum, const GLfloat*)’
/usr/include/GL/glew.h:12201: error: ‘PFNGLFRAGMENTLIGHTFVSGIXPROC’ has a previous declaration as ‘typedef void (* PFNGLFRAGMENTLIGHTFVSGIXPROC)(GLenum, GLenum, GLfloat*)’
这是因为我正在与 SDL 链接（看看它如何支持 OpenGL），还是这里还有其他原因？
Qmake 文件
QT += core
LIBS += -lSDL -lSDL_image -lopengl32 -lGLU -lGLEW
stdafx.h
#pragma once
/*************/
/* #includes */
/*************/
//GL / SDL
#include <GL/glew.h>
#define GLEW_STATIC
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glext.h>
#include <SDL/SDL.h>
#include <SDL/SDL_opengl.h>
//STD
#include <iostream>
#include <fstream>
//Qt
#include <QListIterator>
#include <QMapIterator>
#include <QVector4D>
#include <QColor>
/********************/
/* Using Statements */
/********************/
using std::cout;
using std::endl;
using std::cin;
using std::fstream;
stdafx.cpp
#define GL_GLEXT_PROTOTYPES
I'm trying to link GLEW (with SDL and OpenGL - note, not SDL's implementation of OpenGL) in Qt Creator via a QMake file, though I'm not having much luck. No matter what I try, I seem to get the same string errors which deals with conflicting declaration problems stemming from a few typedefs. What I'd like to know is why this is happening, along with what can be done about it.
Example
/usr/include/SDL/SDL_opengl.h:4855: error: conflicting declaration ‘typedef void (* PFNGLFRAGMENTLIGHTFVSGIXPROC)(GLenum, GLenum, const GLfloat*)’
/usr/include/GL/glew.h:12201: error: ‘PFNGLFRAGMENTLIGHTFVSGIXPROC’ has a previous declaration as ‘typedef void (* PFNGLFRAGMENTLIGHTFVSGIXPROC)(GLenum, GLenum, GLfloat*)’
Is this because I'm linking with SDL (seeing as how it has OpenGL support), or is there something else going on here?
Qmake File
QT += core
LIBS += -lSDL -lSDL_image -lopengl32 -lGLU -lGLEW
stdafx.h
#pragma once
/*************/
/* #includes */
/*************/
//GL / SDL
#include <GL/glew.h>
#define GLEW_STATIC
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glext.h>
#include <SDL/SDL.h>
#include <SDL/SDL_opengl.h>
//STD
#include <iostream>
#include <fstream>
//Qt
#include <QListIterator>
#include <QMapIterator>
#include <QVector4D>
#include <QColor>
/********************/
/* Using Statements */
/********************/
using std::cout;
using std::endl;
using std::cin;
using std::fstream;
stdafx.cpp
#define GL_GLEXT_PROTOTYPES
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评论（2）
解决您问题的唯一方法是不使用其中之一（GLEW 或 SDL_opengl），或者至少不要同时包含
GL/glew.h和SDL/SDL_opengl.h任何源文件或头文件中的标头。The only solution to your problem is not to use one (either GLEW, or SDL_opengl), or at least do not include both
GL/glew.handSDL/SDL_opengl.hheaders in any source or header file.我之前也遇到过类似的问题，我们通过在包含
NO_SDL_GLEXT来“解决”，所以：我说“已解决”，因为它使错误消失，但我从未调查过可能的副作用或问题（在那之后不久我们最终放弃了 SDL，并且再也没有真正使用过它）。也许值得一试...
I have had similar issues before which we "solved" by defining
NO_SDL_GLEXTbefore the inclusion of<SDL/SDL_opengl.h>, so:I say "solved", because it made the errors go away, but I never investigated possible side-effects or problems (we ended up moving away from SDL shortly after that and never really used it anymore). Perhaps worth a try...