Issue #5085 has been reported by Motohiro KOSAKI.

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Backport #5085: Please backport r32647 (workaround for llvm-gcc)
http://redmine.ruby-lang.org/issues/5085

Author: Motohiro KOSAKI
Status: Assigned
Priority: Normal
Assignee: Yuki Sonoda
Category: build
Target version: 


Currently, Xcode4.1 (i.e. Xcode for Lion) makes bad optimization, and then ruby will crash.
Therefore, r32647 changed optflags default to -O0 if the compiler is llvm-gcc.

Please consider backport it. 



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