GCC SDL + GLEW 链接错误
我有一个静态库，在其中通过 GLEW 调用 OpenGL 扩展函数。由于该项目是在 GCC (NetBeans 7.0) 中构建的，并且 GLEW 的二进制文件仅以 Visual-C 风格提供，因此我使用 GCC 将 GLEW (1.7.0) 构建为静态库。 （我也很感兴趣为什么这是必要的，因为 GLEW 似乎是纯 C，其中 ABI 和交叉编译器兼容性不是问题。）
在我的静态库中，我将 GLEW_STATIC 和 NO_SDL_GLEXT 定义为项目预处理器指令（- D），然后我
#include "GL/glew.h"
#include "SDL/SDL.h"
将静态库链接到（测试）应用程序中，该应用程序还按以下顺序链接到以下库：
my_static_library
mingw32
glew32
opengl32
SDLmain
SDL
此设置在我的静态库中给出了两个未定义的引用错误库：
undefined reference to `_imp____glewGetStringi'
undefined reference to `_imp__glewInit'
事实上，这是对静态库中的 GLEW 功能进行的两次调用。然而，链接器曾经抱怨过其他调用（在 -DGLEW_STATIC 之前），但现在似乎没问题。
我无法通过交换 opengl32 和 glew32 的链接顺序来改善这种情况（还有一些对 wgl... 调用的未定义引用）。此外，GLEW_STATIC（和 NO_SDL_GLEXT）曾经在测试应用程序中定义，但已被删除并且似乎并不重要。
为什么会出现其余错误以及我可以采取什么措施来消除它们，即如何在带有 SDL 的 GCC 中使用 GLEW？
I have a static library in which I'm calling OpenGL extension functions via GLEW. As the project is being built in GCC (NetBeans 7.0), and GLEW's binaries are only shipped in Visual-C flavor, I have built GLEW (1.7.0) as a static library, with GCC. (I would also be interested why this is necessary, as GLEW seems to be pure C, in which ABI and cross-compiler compatibility isn't an issue AFAIK.)
In my static library I define GLEW_STATIC and NO_SDL_GLEXT as project preprocessor directives (-D), then I
#include "GL/glew.h"
#include "SDL/SDL.h"
The static library is then linked against in a (test) application, which also links against the following libraries, in the following order:
my_static_library
mingw32
glew32
opengl32
SDLmain
SDL
This setup gives me two undefined reference errors in my static library:
undefined reference to `_imp____glewGetStringi'
undefined reference to `_imp__glewInit'
Indeed, these are two calls made to GLEW functionality, in the static library. There are however other calls that the linker used to complain about (before -DGLEW_STATIC), yet seem to be ok now.
I wasn't able to improve the situation by swapping the order of linkage to opengl32 and glew32 (some more undef'd refs to wgl... calls). Furthermore, GLEW_STATIC (and NO_SDL_GLEXT) used to be defined in the test application but that has been removed and doesn't seem to matter.
Why do the remaining errors occur and what can I do to get rid of them, i.e. how can I use GLEW in GCC with SDL?
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您的库是以这样的方式构建的，以便链接到 GLEW 的 DLL 版本 -
_imp____glewGetStringi和_imp__glewInit是导入库符号，即定义的组合导致以下结果编译时出现一行；如果您在编译库时没有定义
GLEW_STATIC（但您这样做了；仔细检查每个对象）或者
您的 GLEW 版本的标头中存在错误，则可能会发生这种情况。在 GLEW 1.7.0 中，它按预期工作。
You library was built in such a way, as to link to the DLL version of GLEW -
_imp____glewGetStringiand_imp__glewInitare import library symbols, i.e. the combination of defines resulted in the following line appearing when compiling;This can happen if you don't define
GLEW_STATICwhile compiling your library (but you do; double check each object)or
your version of GLEW has a bug in the headers. In GLEW 1.7.0 it works as expected.