Make driver tests more resilient to output trees containing symlinks --
the tests are making assertions about the name of the clang binary, so
we should ensure that the name is as stable as possible.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@148767 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Driver/openbsd.c b/test/Driver/openbsd.c
index 65f4574..911c452 100644
--- a/test/Driver/openbsd.c
+++ b/test/Driver/openbsd.c
@@ -1,4 +1,4 @@
-// RUN: %clang -ccc-clang-archs "" -target i686-pc-openbsd %s -### 2> %t.log
+// RUN: %clang -no-canonical-prefixes -ccc-clang-archs "" -target i686-pc-openbsd %s -### 2> %t.log
 // RUN: FileCheck -input-file %t.log %s
 
 // CHECK: clang{{.*}}" "-cc1" "-triple" "i686-pc-openbsd"