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    <p>To be pedantic, there are 8 different valid -O options you can give to gcc, though there are some that mean the same thing. </p> <p>The original version of this answer stated there were 7 options. GCC has since added <code>-Og</code> to bring the total to 8</p> <p>From the <a href="http://linux.die.net/man/1/gcc" rel="noreferrer">man page:</a></p> <ul> <li><code>-O</code> (Same as <code>-O1</code>) </li> <li><code>-O0</code> (do no optimization, the default if no optimization level is specified)</li> <li><code>-O1</code> (optimize minimally)</li> <li><code>-O2</code> (optimize more)</li> <li><code>-O3</code> (optimize even more)</li> <li><code>-Ofast</code> (optimize very aggressively to the point of breaking standard compliance)</li> <li><code>-Og</code> (Optimize debugging experience. -Og enables optimizations that do not interfere with debugging. It should be the optimization level of choice for the standard edit-compile-debug cycle, offering a reasonable level of optimization while maintaining fast compilation and a good debugging experience.)</li> <li><code>-Os</code> (Optimize for size. <code>-Os</code> enables all <code>-O2</code> optimizations that do not typically increase code size. It also performs further optimizations designed to reduce code size. <code>-Os</code> disables the following optimization flags: <code>-falign-functions -falign-jumps -falign-loops -falign-labels -freorder-blocks -freorder-blocks-and-partition -fprefetch-loop-arrays -ftree-vect-loop-version</code>)</li> </ul> <p>There may also be platform specific optimizations, as @pauldoo notes, OS X has <code>-Oz</code></p>
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    1. POHow many GCC optimization levels are there?
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    1. POHow many GCC optimization levels are there?
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    1. COIf you're developing on Mac OS X there's an additional `-Oz` setting which is "optimize for size more aggressively than `-Os`": http://developer.apple.com/mac/library/DOCUMENTATION/DeveloperTools/gcc-4.0.1/gcc/Optimize-Options.html
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    2. CONote : O3 is not necessarily better than O2 even if the name suggest so. Try both.
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