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The SDK now contains 32 and 64 bit version of SWT. DDMS and Traceview use the archquery java app to check the architecture of the VM to decide which version of SWT should be used to run the apps.
Using the Eclipse projects for traceview. traceview requires SWT to compile. SWT is available in the depot under //device/prebuild/<platform>/swt Because the build path cannot contain relative path that are not inside the project directory, the .classpath file references a user library called ANDROID_SWT. In order to compile the project, make a user library called ANDROID_SWT containing the jar available at //device/prebuild/<platform>/swt.