Apple LLVM similar to GCC has some major optimization flags: O1, O2, O3 etc. For GCC I can watch exactly command-line flags here and some of them are the same for LLVM.
How to know all the flags for LLVM?
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The [LLVM](http://llvm.org/) C and C++ frontend is [CLang](http://clang.llvm.org/) which has a [user manual](http://clang.llvm.org/docs/UsersManual.html). – Some programmer dude Dec 01 '16 at 15:15
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@Someprogrammerdude, saw that - no information about optimization options. And besides, I'm expecting that someone know kind of console command which shows that options for exactly version of LLVM. – Dec 01 '16 at 15:23
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1`clang -help` provides a list of all switches. – Frank C. Dec 02 '16 at 09:34