From 79674968b616fd04ce893081f57af52ef96fdc04 Mon Sep 17 00:00:00 2001
From: Tanya Lattner
Lastly, you can easily mark a test that is expected to fail on a -specific platform by using the XFAIL keyword. Xfail lines are +specific platform or with a specific version of llvmgcc by using the XFAIL keyword. Xfail lines are specified in the comments of the test program using XFAIL, followed by a colon, and one or more regular expressions (separated by a comma) that will match against the target triplet for the machine. You can use * to match all targets. Here is an example of an XFAIL line:
-; XFAIL: darwin,sun +; XFAIL: darwin,sun,llvmgcc4