Hello!
I've benn writing some special tool for making search through obective-c source code.
And now, I've got a problem with compilaton stages.
There is need to preprocess whole source code at the first time, and only modified modules aftewards.

Well, it's like to run my own script instead gcc, where I can insert -E flag in gcc calling.
Thank you!
Sorry for my English.

I cannot answer your question and after a bit of aditional research I am not sure what you are asking could you please clarify?

I alerted Jon to this post as he could probably answer your question but being a holiday it may be a while.

Xcode should only compile modified files when compiling though if that is what you are asking. Could you clarify your question at all? I might be able to offer some more advice with a few more details.

Also, if you do a clean build and clean all your targets before you compile does this resolve your problem? I find that it can often fix strange linking errors when compiling after adding certain code because it will force it to recompile all code regardless of it has been modified.

Xcode uses Apple's own modified version of gcc so their should be a way to apply the -E flag you want in the settings for your project.