[Gold] Question about the incorrect variable alignment if the alignment is greater than the page size

[Alexander Ivchenko]

Hi,

I'm trying to compile and link (with Gold) the code for elf_i386,
which looks something like that:

__attribute__((aligned(8192))) int 8k_aligned_var;

int main()
{
  if( ( (((int)&8k_aligned_var) & 8191) == 0) {
       printf("passed\n");
    }
  else {
       printf("failed\n");
       return 1;
    }
    return 0;
}

And gold does not align "8k_aligned_var" correctly:

++ readelf -a test_gold.exe
++ grep 8k_aligned_var
    31: 0804d000     4 OBJECT  GLOBAL DEFAULT   19 8k_aligned_var

However, if we increase the page size using "-z max-page-size=0x4000"
then the test works:

++ readelf -a test_gold.exe
++ grep 8k_aligned_var
    31: 08052000     4 OBJECT  GLOBAL DEFAULT   19 8k_aligned_var

Also please note that the test works for bfd:

++ readelf -a test_bfd.exe
++ grep 8k_aligned_var
    34: 0804c000     4 OBJECT  GLOBAL DEFAULT   17 8k_aligned_var

Was that behavior made intentionally or it's just a bug?
I know that it's a pretty big alignment and that could be suspicious,
but we can at least warn the user that his code won't be linked the
way it was written.


thanks,
Alexander