question on optimization

[Jim Marshall]

Diego Novillo wrote:
> On 10/26/07, Jim Marshall <jim.marshall@wbemsolutions.com> wrote:
> 
>> gcc <options> module1.c module2.c ... moduleN.c?
> 
> With the current version of GCC, there is no difference.  However, if
> you *do* compile all the .c files with a single command and use
> -combine then the compiler will treat all the .c files as a single one
> and the IPA optimizations will work on all the files at once.  This
> option is currently supported on C only.
> 
> For future versions of GCC we are working on link-time optimization
> features which will be more powerful than -combine (See
> http://gcc.gnu.org/wiki/LinkTimeOptimization for some details).  This
> is not likely to be in GCC for at least a couple of releases, though.
> 
Great, thanks.  I never noticed the --combine option, thanks for the tip!

-Jim