Creating a static library with XCode cross-project references.

I have a project and am trying to move a lot of the code into a static shared library, and added a cross project reference to this library in my app.
However, when I moved a file from my app to the library (removing the reference in my app and moving the file to the library's project directory), and try building my app, I get compiler error messages as if the file I have moved doesn't exist.
When I build my library project, it says the build has succeeded, but the library.a file remains red. It is also red in the my referencing app project.
If anybody has any experience setting up cross-project references in XCode, I'd appreciate any help.
If it helps identify where the problem is, I've performed the following steps to setup the library and cross-project reference:
1. I created a new Cocoa Touch static library project in XCode which would house the shared code.
2. I changed the global settings in XCode to place the build products in a shared build directory (rather that the project directory), and made sure the intermediate build files are placed with the build products.
I changed this using the Preferences menu, but have also gone into the project info for both my app project and the library project and made made sure it is set to place the build projects in the custom shared build directory.
3. I then added a Source Tree, and made sure that the Path of the project directory of the library project.
4. I added a project reference to the library project's .xcodeproj file in my application project. I changed the library project reference so that it was relative to JIGSAW24LIBRARY.
5. I configured the library dependencies by going to my app's target's info, and adding a direct dependency to the library project.
6. In my app's info build tab, I changed the user header search paths so that it uses the search tree I setup (I used the $(SEARCHTREE_NAME) notation, but checked that this resolves to a valid path). I also made sure that the Always Search User Paths checkbox is checked, and that the Library Search Paths is blank.
7. I click-dragged the library.a file under the library project so that it was under the Link Binary With Library sub folder of my app's target.
For step 5, I've also tried adding the reference to the other project as a linked library, rather than a direct dependency, but this doesn't seem to work either.

I managed to fix the problem. The steps above seem to be correct. The problem seems to be related to the source trees that are defined...
I was previously using an absolute path for the source tree which pointed at the folder containing the library project. I changed this to a relative path to the same folder (relative from the calling project) and this seems to fix it.
I'd double checked that the absolute path specified was correct, so it looks like the user header search paths specified must be relative to the current project.

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Message was edited by: sinfoni12345
Message was edited by: sinfoni12345

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