#279 glew-1.13.0: undefined reference to `wglGetProcAddress@4'

[YuGiOhJCJ]

Hello,

I am unable to cross-compile (linux -> windows) glew-1.13.0:

$ make SYSTEM=linux-mingw32 CC=i686-pc-mingw32-gcc LD=i686-pc-mingw32-ld
i686-pc-mingw32-gcc -DGLEW_NO_GLU -DGLEW_BUILD -O2 -Wall -W -Iinclude   -o tmp/linux-mingw32/default/shared/glew.o -c src/glew.c
i686-pc-mingw32-ld -shared -soname libglew32.dll --out-implib lib/libglew32.dll.a     -o lib/glew32.dll tmp/linux-mingw32/default/shared/glew.o  -lopengl32 -lgdi32 -luser32 -lkernel32 
tmp/linux-mingw32/default/shared/glew.o:glew.c:(.text+0x3cc): undefined reference to `wglGetProcAddress@4'
tmp/linux-mingw32/default/shared/glew.o:glew.c:(.text+0x3e8): undefined reference to `wglGetProcAddress@4'
tmp/linux-mingw32/default/shared/glew.o:glew.c:(.text+0x404): undefined reference to `wglGetProcAddress@4'
tmp/linux-mingw32/default/shared/glew.o:glew.c:(.text+0x418): undefined reference to `wglGetProcAddress@4'
tmp/linux-mingw32/default/shared/glew.o:glew.c:(.text+0x42c): undefined reference to `wglGetProcAddress@4'
tmp/linux-mingw32/default/shared/glew.o:glew.c:(.text+0x440): more undefined references to `wglGetProcAddress@4' follow
tmp/linux-mingw32/default/shared/glew.o:glew.c:(.text+0x1783f): undefined reference to `wglGetCurrentDC@0'
tmp/linux-mingw32/default/shared/glew.o:glew.c:(.text+0x178af): undefined reference to `wglGetProcAddress@4'
tmp/linux-mingw32/default/shared/glew.o:glew.c:(.text+0x178c3): undefined reference to `wglGetProcAddress@4'
tmp/linux-mingw32/default/shared/glew.o:glew.c:(.text+0x178de): undefined reference to `wglGetCurrentDC@0'
tmp/linux-mingw32/default/shared/glew.o:glew.c:(.text+0x1795a): undefined reference to `wglGetProcAddress@4'
tmp/linux-mingw32/default/shared/glew.o:glew.c:(.text+0x17ae0): undefined reference to `wglGetProcAddress@4'
tmp/linux-mingw32/default/shared/glew.o:glew.c:(.text+0x17afc): undefined reference to `wglGetProcAddress@4'
tmp/linux-mingw32/default/shared/glew.o:glew.c:(.text+0x17b1a): undefined reference to `wglGetProcAddress@4'
tmp/linux-mingw32/default/shared/glew.o:glew.c:(.text+0x17efc): undefined reference to `wglGetProcAddress@4'
tmp/linux-mingw32/default/shared/glew.o:glew.c:(.text+0x17f18): more undefined references to `wglGetProcAddress@4' follow
make: *** [lib/glew32.dll] Error 1

Any idea why?

Thank you.
Best regards.

[Nigel Stewart]

Seems to work for me on Ubuntu 15.04. Can you describe more about your setup?

$ make SYSTEM=linux-mingw32 CC=x86_64-w64-mingw32-gcc LD=x86_64-w64-mingw32-ld

[YuGiOhJCJ]

My setup is Slackware 14.1 and:
- i686-pc-mingw32-binutils-2.24.51
- i686-pc-mingw32-gcc-4.9.1
- i686-pc-mingw32-mesa-9.1.3
- i686-pc-mingw32-mingwrt-3.20.2
- i686-pc-mingw32-w32api-3.17.2

But don't worry because the problem seems to come from an other software than glew.
Indeed, I discovered that glfw-3.1.1 that is also using the opengl32 library shows the same error:

$ make
[ 23%] Built target glfw
Linking C executable boing.exe
../src/libglfw3.a(wgl_context.c.obj):wgl_context.c:(.text+0xa9): undefined reference to `wglGetProcAddress@4'
../src/libglfw3.a(wgl_context.c.obj):wgl_context.c:(.text+0xd0): undefined reference to `wglGetProcAddress@4'
../src/libglfw3.a(wgl_context.c.obj):wgl_context.c:(.text+0x140): undefined reference to `wglGetProcAddress@4'
../src/libglfw3.a(wgl_context.c.obj):wgl_context.c:(.text+0x207): undefined reference to `wglGetProcAddress@4'
../src/libglfw3.a(wgl_context.c.obj):wgl_context.c:(.text+0x248): undefined reference to `wglGetProcAddress@4'
../src/libglfw3.a(wgl_context.c.obj):wgl_context.c:(.text+0xe07): undefined reference to `wglCreateContext@4'
../src/libglfw3.a(wgl_context.c.obj):wgl_context.c:(.text+0xe5b): undefined reference to `wglShareLists@8'
../src/libglfw3.a(wgl_context.c.obj):wgl_context.c:(.text+0xebe): undefined reference to `wglDeleteContext@4'
../src/libglfw3.a(wgl_context.c.obj):wgl_context.c:(.text+0x10da): undefined reference to `wglMakeCurrent@8'
../src/libglfw3.a(wgl_context.c.obj):wgl_context.c:(.text+0x10f3): undefined reference to `wglMakeCurrent@8'
../src/libglfw3.a(wgl_context.c.obj):wgl_context.c:(.text+0x1213): undefined reference to `wglGetProcAddress@4'
collect2: error: ld returned 1 exit status
make[2]: *** [examples/boing.exe] Error 1
make[1]: *** [examples/CMakeFiles/boing.dir/all] Error 2
make: *** [all] Error 2

So, there are a lot of chance that the problem comes from the "i686-pc-mingw32-mesa-9.1.3" package that provides the "/usr/i686-pc-mingw32/lib/libopengl32.a" file.
I have reported the bug to mesa too [1].

Maybe this can help to understand the problem:

$ nm /usr/i686-pc-mingw32/lib/libopengl32.a | grep wglGetProc
00000000 I __imp__wglGetProcAddress
00000000 T _wglGetProcAddress

Can you check if you have the same result with the "nm" command and your "libopengl32.a" file?

[1] https://bugs.freedesktop.org/show_bug.cgi?id=91711

[YuGiOhJCJ]

OK I found how to solve this problem.
Instead of using the libopengl32.a file provided by mesa I need to use the one provided by my cross-compiler.
The problem is that my current cross-compiler [1] does not provide the /usr/i686-pc-mingw32/lib/libopengl32.a file.
So, I have installed a new cross-compiler [2] that does correctly the job.

Now, my cross-compiler already provides a /usr/i686-pc-mingw32/lib/libopengl32.a file.
So, I should not cross-compiling mesa because it will overrides this file that will contain incorrect symbols.

The libopengl32.a provided by my new cross-compiler contains the correct symbols:

$ nm /usr/i686-w64-mingw32/lib/libopengl32.a | grep wglGetProc
00000000 I __imp__wglGetProcAddress@4
00000000 T _wglGetProcAddress@4

The question is why I need to use the library provided by my cross-compiler and not the one from mesa?
I don't know, but what is sure is that the problem is not related to the glew project.

[1] http://www.mingw.org/
[2] http://mingw-w64.org

[Nigel Stewart]

Oh good. It does make sense to depend on the windows opengl32.dll, rather than Mesa.

[Nigel Stewart]

Closing, resolved.