Description of problem:

When we run gcc with "-O2",
the following message is shown. 
------------------------------------
/tmp/ccQQ3lnD.o(.text+0x10): In function `geta':
: undefined reference to `a'
collect2: ld returned 1 exit status
------------------------------------

Our test program is as follows.(smp.c)
------------------------------------
<smp.c>
#include<stdio.h>


typedef unsigned int UINT32;

UINT32 geta(void);


static UINT32 a=3;
/* UINT32 a=5; */


UINT32 geta(void){
  __asm (
       "{alloc r19 = ar.pfs, 0,0,0,0;;\n\t"
       "nop.m 0\n\t"
       "nop.i 0};;\n\t"
       "{addl r18 = @ltoff(a#), r1\n\t"
       "nop.m 0\n\t"
       "nop.i 0};;\n\t"
       "{ld8 r18 = [r18]\n\t"
       "nop.m 0\n\t"
       "nop.i 0};;\n\t"
       "{ld4 r8 = [r18]\n\t"
       "nop.m 0\n\t"
       "nop.i 0};;\n\t"
       "br.ret.sptk.many b0;;\n\t"
       );
}

main(){
   UINT32 out;

   out = geta();
   printf("%08X\n",out);
}
------------------------------------

This compile error is caused by gcc's bug ?
Or it's feature of option "-O2" ? 

Temporarily, we run "# gcc -O2 -fno-unit-at-a-time smp.c", 
in order to avoid the error. 
Our act is right ?

[Having tried]
 (1) When we run gcc without option,
     there is no error.
     (# gcc smp.c)

 (2) We changed
     "static UINT32 a=3" in test program(smp.c) into "UINT32 a=5".
     There is no error.

Version-Release number of selected component (if applicable):
gcc-3.4.2-6.fc3

How reproducible:
Always

Steps to Reproduce:
1. # gcc -O2 smp.c
  
Actual results:

# gcc -O2 smp.c
/tmp/ccQQ3lnD.o(.text+0x10): In function `geta':
: undefined reference to `a'
collect2: ld returned 1 exit status

Expected results:

(1) This compile error is caused by gcc's bug ?
    Or it's feature of option "-O2" ? 
    ("a" is referred to only at inline assembler.)

(2) When is corrected gcc released ? (if gcc is bug) 

(3) Our act is right ?
    (avoid error by option "-fno-unit-at-a-time")

Additional info: