cc - -O3 -march=native

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Ubuntu clang version 3.8.0-svn251449-1~exp1 (trunk) (based on LLVM 3.8.0)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin/.
Found candidate GCC installation: /usr/bin/./../lib/gcc/x86_64-linux-gnu/5.2.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.2.1
Selected GCC installation: /usr/bin/./../lib/gcc/x86_64-linux-gnu/5.2.1
Candidate multilib: .;@m64
Selected multilib: .;@m64

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