llvm - add upgrade caveat

1 files changed, 8 insertions, 0 deletions

diff --git a/Library/Formula/llvm.rb b/Library/Formula/llvm.rb
index 29b6db52c..cce6a3c8d 100644
--- a/Library/Formula/llvm.rb
+++ b/Library/Formula/llvm.rb
@@ -37,4 +37,12 @@ class Llvm <Formula
       end
     end
   end
+
+  def caveats; <<-EOS
+    If you already have LLVM installed, then "brew upgrade llvm" might not
+    work. Instead, try:
+        $ brew rm llvm
+        $ brew install llvm
+    EOS
+  end
 end