Re: [Dev-C++] problem linking to freeglut

[<or...@vp...>]

Chris Dion wrote:
> Hurray!  Matching the linker settings to those in the template resolved 
> the linker errors.  Thanks for your help Damien and Balázs.

A bit of explanation of the error. The linker spitted this (what you 
posted):

g++.exe src/cobject.o src/cstring.o src/main.o src/cmemorystream.o 
src/capplication.o src/cwindow.o  -o "Core.exe" -L"C:/Dev-Cpp/lib" 
-lopengl32 -lfreeglut
src/capplication.o(.text+0xc):capplication.cpp: undefined reference to 
`_imp__glutInitDisplayMode@4'
src/capplication.o(.text+0x1e):capplication.cpp: undefined reference to 
`_imp__glutIdleFunc@4'
src/capplication.o(.text+0xb8):capplication.cpp: undefined reference to 
`_imp__glutDisplayFunc@4'
src/capplication.o(.text+0xca):capplication.cpp: undefined reference to 
`_imp__glutReshapeFunc@4'
src/capplication.o(.text+0xdc):capplication.cpp: undefined reference to 
`_imp__glutMouseFunc@4'

As you see, the linker cannot find symbols like "_imp__glutMouseFunc@4" 
etc. However, you might wonder why, as glutMouseFunc IS defined in the 
freeglut headers. But if you take a closer look, it is prefixed with 
"_imp_" which marks, that the linker is looking for an imported 
function, that is: a function, which is inside a DLL. And this happens 
because the compiler compiled your program without the define I wrote 
(-DFREEGLUT_STATIC), and by default, the headers of freeglut set up 
things to use the dynamic build of freeglut (FREEGLUT_DYNAMIC is the 
default).
So when you linked your program, the linker looked for imported 
functions, however the freeglut devpak contains a static build, and a 
static library's functions don't contain "_imp_" decorations. The linker 
saw the two as totally different symbols.

I hope that helps a bit to see the works in behind.

--
Greetings,
   Balázs