IPO over multiple source files

[sroy]

Does gcc (4.2 and above) have the capability to perform interprocedural
analyses and optimizations over multiple source files? For example, there
are two files a.c and b.c (shown below)

File a.c:
------------
#include<stdio.h>
static int foo (int i, int j) {return i*j;}
int main (void) {printf ("%d\n", foo (10, foo1 ()));return 0;}

File b.c:
------------
int foo1 (void) {return 10;}

What options, if any, will enable inlining of the body of foo1 () into
main()?

regards,
Soumyaroop
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