MIPS -gc-sections broken?

[Hiroki Kaminaga <kaminaga at sm dot sony dot co dot jp>]

Hi,

While using -gc-sections option on MIPS ld, it seems that symbol which
are in .bss section and is referenced by function that are to be removed
by -gc-sections is not handled properly. Here is a sample. Binutils
version used is 2.17.50.0.17, but I believe this happens in latest
binutils too.


    *    *    *    *    *    *    *    *

$ cat foo.c
int gbl_common[1800];

int func_not_called(void)
{
  return gbl_common[0];
}

int foo(void) {
  return 42;
}

$ cat main.c 
extern int foo(void);
int main(void){
  return foo();
}

$ mips-unknown-linux-dev-gcc -ffunction-sections -fdata-sections -Wl,-gc-sections -o test foo.c main.c

(executing on MIPS target)
# ./test 
./test: symbol lookup error: ./test: undefined symbol: gbl_common


    *    *    *    *    *    *    *    *

Looking symbols by readelf gives

$ mips-unknown-linux-dev-readelf -s test | grep gbl_common
     4: 00000000  7200 OBJECT  GLOBAL DEFAULT  ABS gbl_common

and does not belong to any section... gbl_common symbol should be
removed, or at least have its entry in .bss section.
Any hints, comments are appreciated!

Thanks in Advance,


----
(Hiroki Kaminaga)
t