LTO question

Bingfeng Mei bmei@broadcom.com
Tue Oct 13 12:51:00 GMT 2009


Hello,
I just had the first taste with the latest LTO merge on our port.  
Compiler is configured with LTO enabled and built correctly. 
I tried the following example: 
 
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. 
 
Did I miss something here? Are there new hooks I should specify or tune for 
LTO? I checked the up-to-date internal manual and found nothing.
 
Thanks,
Bingfeng Mei
 



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