Building 1.8 from on MacOSX - Cg problems

[d000hg]

I am getting errors that <Cg/cg.h> doesn't exist when CgProgramManager is built. But I do have the Cg toolkit installed and things appear to be correct:

On disk: ls /Library/Frameworks/Cg.framework/Headers => cg.h cgGL.h
CMake automatically detected: Cg_INCLUDE_DIR = /Library/Frameworks/Cg.framework/Headers
In XCode, Plugin_CgProgramManager Header Search Paths: /usr/local/ogre/ogre1.8/src/OgreMain/include /Library/Frameworks/Cg.framework/Headers

And yet:

/usr/local/ogre/ogre1.8/src/PlugIns/CgProgramManager/include/OgreCgPrerequisites.h:32:19: error: Cg/cg.h: No such file or directory

I don't get what's wrong, even XCode seems to think it knows the path! This is a clean build using default CMake for 1.8.

[d000hg]

bump.

[masterfalcon]

How are you configuring the project with CMake? It works fine for me.

[d000hg]

I finally came back to this and I can at least see why it's not working.

OgreCgPrerequisites.h #includes <Cg/cg.h> but the Plugin_CgProgramManager project has a header search path /Library/Frameworks/Cg.framework/Headers, which is where Cg is installed. So the path to cg.h on my Mac is actually /Library/Frameworks/Cg.framework/Headers/cg.h, there is no 'Cg' dir.

To those of you running on Mac, I'd appreciate knowing how your systems differ from mine or any extra step you had to do.

[masterfalcon]

Actually, Cg/cg.h should work as long as the framework search path is set. See Cocoa/Cocoa.h, AppKit/AppKit.h, etc.

[d000hg]

I was looking at my filesystem and it seemed a bit odd what I saw:

Screen shot 2012-05-09 at 21.19.31.png

The only stuff in the Cg.framework dir seems to be the headers... I re-installed Cg3.1 (Feb2012) on my Snow Leopard Mac and this stays the same. Shouldn't there be some binaries somewhere - how does it comare to yours?

[masterfalcon]

That's correct. The item named Cg is the binary. This is how frameworks are laid out on OS X. Apple's docs on bundles can give you more in depth info.

[d000hg]

OK so it is installed right, good.

I tested changing <Cg/cg.h> => <cg.h> and now it compiles OK. But on linking I get "Framework not found Cg". It's almost like it doesn't realise Cg is a framework and is treating it as a regular dir. Does that even make sense?

[masterfalcon]

yeah, you'll need to add /Library/Frameworks to your framework search paths. It should pick it up.

[d000hg]

Oh I have that already - CMake added that. As I say, it seems somehow like it is not being recognised AS a framework but I don't know if frameworks are special at all.

I assume you're running XCode 4 with Ogre 1.8? Has anyone tried 1.8 with 3.2.x?

Anyway I'll do a full clean CMake build just to be safe, but I wonder if this is it: http://stackoverflow.com/questions/5293 ... frameworks

[d000hg]

Clean build yields same issues. Here are my settings fresh from CMake:
Framework Search Paths: /Library/Frameworks /Applications

Header Search Paths: /usr/local/ogre/ogre1.8/src/OgreMain/include /usr/local/ogre/ogre1.8/build/mac/include /usr/local/ogre/ogre1.8/src/OgreMain/include/OSX /usr/local/ogre/ogre1.8/Dependencies/include /usr/local/ogre/ogre1.8/Dependencies/include/OIS /Library/Frameworks/Cg.framework/Headers /System/Library/Frameworks/Carbon.framework/Headers /System/Library/Frameworks/Cocoa.framework/Headers /System/Library/Frameworks/CoreVideo.framework/Headers /usr/local/ogre/ogre1.8/src /usr/local/ogre/ogre1.8/src/PlugIns/CgProgramManager/include

Other Linker Flags: -dynamiclib -Wl,-headerpad_max_install_names /usr/local/ogre/ogre1.8/build/mac/lib/Debug/Ogre.framework/Versions/1.8.0/Ogre -framework Cg /usr/local/ogre/ogre1.8/Dependencies/lib/debug/libfreetype.a -framework Carbon -framework Cocoa /opt/local/lib/libboost_thread-mt.a /opt/local/lib/libboost_date_time-mt.a /usr/local/ogre/ogre1.8/Dependencies/lib/debug/libfreeimage.a /usr/local/ogre/ogre1.8/Dependencies/lib/debug/libzzip.a /usr/lib/libz.dylib

[d000hg]

Well, after a lot of messing about I seem to have found the cause - but not the underlying reason.

I am using a MacBook with clean install of OSX10.6, and the CMake-generated Ogre project was set to use 10.6 (SDK_ROOT). The same when I created a brand new test C++ console project in XCode.
BUT, when I changed SDK to 10.5, suddenly it works!

I checked on disk and both SDKs have a link to /Library/Frameworks:

Screen shot 2012-05-15 at 12.15.12.png

So I don't know what the issue is - if I upgraded from 10.5 -> 10.6 or something it would make some sense but everything looks perfect. Any ideas... I suppose I can just build for 10.5 but would like to understand what's happening.