[PATCH] Also disallow global alias of common symbol

[Nick Clifton]

Hi H.J. 

> gas/
> 
> 	PR gas/21667
> 	* read.c (pseudo_set): Update error message for alias of common
> 	symbol.
> 	* write.c (write_object_file): Disallow both local and global
> 	aliases of common symbol.
> 	* testsuite/gas/elf/common5a.d: New file.
> 	* testsuite/gas/elf/common5a.l: Likewise.
> 	* testsuite/gas/elf/common5a.s: Likewise.
> 	* testsuite/gas/elf/common5b.d: Likewise.
> 	* testsuite/gas/elf/common5b.l: Likewise.
> 	* testsuite/gas/elf/common5b.s: Likewise.
> 	* testsuite/gas/elf/common5c.d: Likewise.
> 	* testsuite/gas/elf/common5c.s: Likewise.
> 	* testsuite/gas/elf/common5d.d: Likewise.
> 	* testsuite/gas/elf/common5d.s: Likewise.
> 	* testsuite/gas/elf/elf.exp: Run common5a, common5b, common5c
> 	and common5d.
 
Approved - please apply.

Cheers
  Nick