Jimmy Tang f86ed1e34d Fix for llvm 4.0.0 on centos (#3904) ... * Fix for llvm 4.0.0 on centos This addresses https://github.com/LLNL/spack/issues/3791 * Only enable this option if on linux * Change condition to satisfy standard		2017-04-21 11:29:41 -05:00
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spack	Fix for llvm 4.0.0 on centos (#3904)	2017-04-21 11:29:41 -05:00