Section attribute to local external variable

[chandrakala chavva <cchavva at yahoo dot com>]

I configured the toolchain for mips64-elf target and
when i compiled the following testcases, the compiler
generates relocation truncated to fix error message.

def.c

int abc __attribute__ ((section (".ABC")));
main()
{
   printf ("main: value of abc is %d\n", abc = 10);
   foo ();
 
   return 0;
}

use.c

foo ()
{
  int abc;
 
   abc = 20;
  
   printf ("foo: The initial value of abc is %d\n",
abc);
 
   {
     extern int abc;
 
     printf ("foo: The value of abc has been changed
%d\n", abc);
 
   }
 
   printf ("foo: The final value of abc is %d\n",
abc);
}

$ mips64-elf-gcc def.c use.c -Tidt.ld 

generates this error message

/tmp/ccSaSWo0.o(.text+0x30): In function `foo':
: relocation truncated to fit: R_MIPS_GPREL16 abc
collect2: ld returned 1 exit status

The compiler generates gp_rel code for the local
external variable in use.c. But to use gp_rel
optimized code i need to add section attribute to
local external variable as defined in the definition. 

If i change the testcase use.c to 

foo ()
{
  int abc;
 
   abc = 20;
  
   printf ("foo: The initial value of abc is %d\n",
abc);
 
   {
     extern int abc __attribute__ ((section
(".ABC")));
 
     printf ("foo: The value of abc has been changed
%d\n", abc);
 
   }
 
   printf ("foo: The final value of abc is %d\n",
abc);
}

The compiler generate the following error message.

use.c: In function `foo':
use.c:10: error: section attribute cannot be specified
for local variables

Here is the patch to fix this problem. Please let me
know it is okay to apply or not.



Thanks
Chandra





		
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