xcode Workspaces(2)

Each project in a workspace continues to have its own independent identity. To work on a project without affecting—or being affected by—the other projects in the workspace, you can open the project without opening the workspace, or you can add the project to another workspace. Because a project can belong to more than one workspace, you can work on your projects in any number of combinations without having to reconfigure any of the projects or workspaces.

You can use the workspace’s default build directory or you can specify one. Note that if a project specifies a build directory, that directory is overridden by the build directory of whatever workspace the project is in at the time you build the project.