Code::Blocks undefined reference to "*" [duplicate]

Question

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What is an undefined reference/unresolved external symbol error and how do I fix it? (39 answers)

Closed 7 years ago.

Like the title says, I'm getting multiple build errors using C::B, all are saying undefined reference to '*'. I'm trying to build a program using OpenGL, GLFW, and GLEW. The top three things that it cant find every time are _imp__CreateDCW@16, _imp__GetDeviceCaps@8, _imp__DeleteDC@4. When looking on the internet, I saw that all of those methods were in the gdi32 library, which I made sure to add to the linker. The error appears to be happening as soon as I try to use methods from GLFW3. I've tried using different builds of GLFW using MinGW, which is what I'm using with Code::Blocks, but I cannot get the error to go away.

I am developing on Windows 8.1, using Code::Blocks 13.12.

Here is a list of everything I am linking and in the same order:

• gdi32
• kernel32
• user32
• opengl32
• glu32
• glfw3

Code::Blocks is turning out to be a bit of a hassle, but I really want to start to get used to it. Thanks to anyone who can help.

Answer 1

You've to pass -lgdi32 for the linker to know that you're using GDI functions. Also the order matters. On Windows 8 with MinGW 4.8.1 tool chain I give this:

• glew
• glfw3
• opengl32
• gdi32

And it works for me; I don't include the other win32 libraries. If you're using GLEW's static library make sure you define GLEW_STATIC either in CB or directly as -DGLEW_STATIC.

As for the IDE, I chose QtCreator with CMake and with no Qt SDK.