LTO question

[Bingfeng Mei]

Thanks. It works. I thought -fwhole-program was used with --combine and they are replaced
by -flto. Now it seems that -flto is equivalent of --combine, and -fwhole-program is still
important. 

Bingfeng  

> -----Original Message-----
> From: Diego Novillo [mailto:dnovillo@google.com] 
> Sent: 13 October 2009 14:30
> To: Bingfeng Mei
> Cc: gcc@gcc.gnu.org
> Subject: Re: LTO question
> 
> On Tue, Oct 13, 2009 at 08:47, Bingfeng Mei <bmei@broadcom.com> wrote:
> 
> > a.c
> > extern void foo(int);
> > int main()
> > {  foo(20);
> >  return 1;
> > }
> >
> > b.c
> > #include <stdio.h>
> > void foo(int c)
> > {
> >  printf("Hello world: %d\n", c);
> > }
> >
> > compiled with:
> > firepath-elf-gcc -flto a.c b.c -save-temps -O2
> >
> > I expected that foo should be inlined into main, but not.  
> Both functions
> >  of main and foo are present in a.s, while b.s contains the 
> LTO code.
> 
> Try adding -fwhole-program.
> 
> 
> Diego.
> 
>