Xcode 4.5: dependencies not updated when using workspaces

I installed Xcode 4.5 today and I have the following problem:

I use workspaces to develop a library and app simultaneously. When I change something in the library and build the app, the library gets rebuilt with the new changes. This works fine in Xcode 4.3/4.4. However, since Xcode 4.5 this doesn't seem to work anymore. I always have to "Clean" the project, otherwise changes are not visible, although the targets are built in correct order (lib, app).

Has anyone experienced the same? Does a workaround exist?

-Alexander

Solution

Here's one possible cause of this (there's probably others):

Make sure the Identity and Type inspector is showing and select the libWhatever.a file in your application's project (not the library). If you see Location: Relative to Project, this is your problem.

Click Relative to Project and change it to Relative to Build Products.
This will change the type of the link, but it will still be broken.
Click the locate button and find the output file.

Honestly, you're probably better off editing the pbxproj directly. Your patch will look something like this:

Index: App.xcodeproj/project.pbxproj
===================================================================
--- App.xcodeproj/project.pbxproj     (revision 28061)
+++ App.xcodeproj/project.pbxproj     (working copy)
@@ -28,7 +28,7 @@

 /* Begin PBXFileReference section */
           A7052F8F1358BFCC00178DAC /* libsqlite3.dylib */ = {isa = PBXFileReference; lastKnownFileType = "compiled.mach-o.dylib"; name = libsqlite3.dylib; path = usr/lib/libsqlite3.dylib; sourceTree = SDKROOT; };
-          A74F787413566130000D0AFC /* libLibrary.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; path = libLibrary.a; sourceTree = SOURCE_ROOT; };
+          A74F787413566130000D0AFC /* libLibrary.a */ = {isa = PBXFileReference; lastKnownFileType = archive.ar; path = libLibrary.a; sourceTree = BUILT_PRODUCTS_DIR; };
           A74F787D135665A3000D0AFC /* Macros.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = Macros.h; path = DslExt/Macros.h; sourceTree = "<group>"; };
           A74F787E135665A3000D0AFC /* Foundation-dsl.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = "Foundation-dsl.m"; path = "DslExt/Foundation-dsl.m"; sourceTree = "<group>"; };
           A74F787F135665A3000D0AFC /* Foundation-dsl.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = "Foundation-dsl.h"; path = "DslExt/Foundation-dsl.h"; sourceTree = "<group>"; };

I found this answer here:

What's the correct way to configure XCode 4 workspaces to build dependencies when needed?