Optimization options?

Juanma Barranquero jmbarranquero at laley.wke.es
Wed Oct 22 11:07:52 EDT 2003

User's Guide 6.2 says:

"So, when we want very fast code, we use: -O -fvia-C."

but I've seen programs which use the (apparently undocumented) -O2-for-C
flag too.

In fact, generally speaking anyone of:

 -O  -fvia-C
 -O2 -fvia-C
 -O  -fvia-C -O2-for-C
 -O2 -fvia-C -O2-for-C

produces different output... So, which is the best choice?


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