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+// RUN: %clang -### -g %s -c 2>&1 | grep '"-fdebug-compilation-dir" "'%S'"'
+// RUN: PWD=/foo %clang -### -g %s -c 2>&1 | grep '"-fdebug-compilation-dir" "/foo"'
+
+// This test uses grep instead of FileCheck so that we get %S -> dirname
+// substitution.
+
+// "PWD=/foo gcc" wouldn't necessarily work. You would need to pick a different
+// path to the same directory (try a symlink).