How to use GLEW with MinGW [duplicate]

Question

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• What is an undefined reference/unresolved external symbol error and how do I fix it? 32 answers

I was trying to use glew32.lib file to link in my project, than I compile Glew source by myself to get glew.a file. Now, I have these link errors in my project:

g++ -o Chapter10(OpenCLTest).exe src\Chapter10(OpenCLTest).o -lopengl32 -lglew -lglut32 -lglu32 -lopencl
src\Chapter10(OpenCLTest).o:Chapter10(OpenCLTest).cpp:(.text+0x167): undefined reference to `_imp____glewBindBuffer'
src\Chapter10(OpenCLTest).o:Chapter10(OpenCLTest).cpp:(.text+0x39a): undefined reference to `_imp__glewInit'
src\Chapter10(OpenCLTest).o:Chapter10(OpenCLTest).cpp:(.text+0x3a7): undefined reference to `_imp__glewIsSupported'
src\Chapter10(OpenCLTest).o:Chapter10(OpenCLTest).cpp:(.text+0x48a): undefined reference to `_imp____glewGenBuffers'
src\Chapter10(OpenCLTest).o:Chapter10(OpenCLTest).cpp:(.text+0x495): undefined reference to `_imp____glewBindBuffer'
src\Chapter10(OpenCLTest).o:Chapter10(OpenCLTest).cpp:(.text+0x4dd): undefined reference to `_imp____glewBufferData'
src\Chapter10(OpenCLTest).o:Chapter10(OpenCLTest).cpp:(.text+0x50b): undefined reference to `_imp____glewGetBufferParameteriv'
src\Chapter10(OpenCLTest).o:Chapter10(OpenCLTest).cpp:(.text+0x1d67): undefined reference to `_imp____glewBindBuffer'
src\Chapter10(OpenCLTest).o:Chapter10(OpenCLTest).cpp:(.text+0x1d7f): undefined reference to `_imp____glewDeleteBuffers'
src\Chapter10(OpenCLTest).o:Chapter10(OpenCLTest).cpp:(.text+0x1d95): undefined reference to `_imp____glewBindBuffer'
src\Chapter10(OpenCLTest).o:Chapter10(OpenCLTest).cpp:(.text+0x1dad): undefined reference to `_imp____glewDeleteBuffers'
src\Chapter10(OpenCLTest).o:Chapter10(OpenCLTest).cpp:(.text+0x2078): undefined reference to `_imp____glewBindBuffer'
collect2: ld returned 1 exit status

It is good to solve this problem but by the way I want to ask are there any other opengl implementaions of gl extentions?

Answer 1

You could try GLee which essentially does the same thing as GLEW.

Answer 2

I'm afraid you can't use glew.lib with g++ (because .lib is a proprietary Microsoft format). These errors you get are missing function entry points, meaning that you didn't compile GLEW correctly (the required functions are not exported in your .so - need to know more details in order to be able to solve this issue).

As for the other part of the question, you can try GLEH. It is still in the development phase and may need some tweaking to work for you, but we've been using it quite successfuly in linux so it shouldn't be too bad.

Answer 3

(I know this is a bit late, but I figured it might solve someone else's problem, so) I had a very similar problem compiling a program that linked to GLEW dynamically. It turns out that I had overlooked the libglew32.dll.a file - that also needed to be present (in addition to libglew32.a and glew32.dll that I had previously copied to my project folder.)

Answer 4

Strange nobody has said anything about this. By default on Windows, the GLEW headers use declspec(dllimport) for all of the external functions, which mangles all of their names. This is why all of the missing external symbol names all have _imp____ at the front.

If you wan't to use a static build of GLEW (you mentioned something about libglew.a), define GLEW_STATIC during the build of GLEW and during the build of your application. This will unmangle the names for static linking.

If you want to link to a shared library version of GLEW, make sure to build GLEW with GLEW_BUILD. I'm not sure if this is necessary with gcc but it is if the library is built with MSVC.

Furthermore, the GNU toolchain actually supports Microsoft's .lib format for linking. source

You may find it easiest to just compile GLEW yourself or even include it in your project. It is only one source file and a few headers. To compile the library manually, use something along the lines of gcc -shared -o libGLEW.dll -Wl,--out-implib=libGLEW.dll.a -O2 -DGLEW_BUILD glew.c. To get the static version use something like gcc -c -O2 -DGLEW_STATIC glew.c instead.