where can I get gcc optimizations information

[John Love-Jensen]

Hi Juan,

> When using "-fverbose-asm" flag in the commmand line to produce the list of
> optimization passes, I suppose you mean adding the "-S" flag to see the
> assemble file, don't you? I say this because using the flag in a common
> compilation doesn't produce any change.

> Anyway, taking a look at the assemble file, I can see the flags employed when
> I compile with -O1 option, but if I introduce them all in the command line
> instead of -O1 (it is supposed that the executable file would be the same),
> optimizations are not performed. What am I doing wrong? I have read source
> code and -O1 flag activates some other flags and it seems it does not any
> more.

-O0 (which is the default if not specified) disables optimizations.

So introducing specific flagged optimizations in the context of
optimizations disabled has no effect.

HTH,
--Eljay