FLTK and OpenGL projects settings error on Xcode

[Roger]

Hello fellow FLTK fans.

I work on Mac OS 10.8, and I installed my FLTK with brew and set up an Xcode project by following the steps here. To be more specific what I did is the following setting on the project:

Header Search Paths : -I/usr/local/include

Library Search Paths : /usr/local/lib

other linker flags: -L/usr/local/lib -lfltk -lpthread -framework Cocoa

After the above setup, I can compile helloworld.cpp (it draws a fltk box on an fltk window) in attachments without a hitch. But I am unable to compile another source file glwin.cpp (it draw a yellow square on an OpenGL window) that uses the Fl_Gl_window header. The error message is copied into error.txt. Some googling of the error leads me here. So I found out that I could compile correctly with the terminal by the following command

fltk-config --use-gl --compile glwin.cpp

And the option "--use-gl" did all the trick. If without it can only compile helloworld.cpp. 

I am curiously wondering, how do I apply an equivalent of this "use-gl" option to the Xcode project so that it compiles right?

Any comments appreciated.

Roger

[Kevin Ingwersen (Ingwie Phoenix)]

Hey.

Add the OpenGL framework and -lfltk_gl and you are good to go, if brew installs that. :)

Kind regards, Ingwie.

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<glwin.cpp><helloworld.cpp><error.txt>

[Greg Ercolano]

On 03/14/15 14:36, Roger wrote:

> how do I apply an equivalent of this "use-gl" option to the Xcode project
> so that it compiles right?

    Look at the build output from the fltk-config command, it should be showing you what libs + frameworks it links in, so just use those.
    For instance, building the glpuzzle test program:

---

$ cd /usr/local/src/fltk-1.3.x-svn/test
$ ../fltk-config --use-gl --compile glpuzzle.cxx
g++ -I.. -I../png -I../jpeg -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_THREAD_SAFE -D_REENTRANT -o 'glpuzzle' 'glpuzzle.cxx' ../lib/libfltk_gl.a -framework AGL -framework OpenGL -framework ApplicationServices ../lib/libfltk.a -lpthread -framework Cocoa
Creating 'glpuzzle.app' bundle for desktop...

---

    The text in red being the libs + frameworks to link with.

    Also, while I don't use Xcode myself (the GUI IDE anyway), pretty sure we have Xcode projects in the fltk ide/Xcode4 directory that builds FLTK, and if it includes building the opengl test programs (e.g. glpuzzle), you can look there for how to do it.