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   Linux FAQ > 6. Porting, Compiling and Obtaining Programs
Question: 6.8. What Does ``gcc -O6'' Do?
Answer:

Currently, the same as -O2 (GCC 2.5) or -O3 (GCC 2.6, 2.7). Any number greater than that does the same thing. The Makefiles of newer kernels use -O2, and you should probably do the same.
This FAQ is from Linux Frequently Asked Questions with Answers, maintained by Robert Kiesling

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