AARCH64 configure check for gas -mabi support

[Kugan]

Hi,

gcc trunk aarch64 bootstrapping fails with gas version 2.23.2 (with
error message similar to cannot compute suffix of object files) as this
particular version does not support -mabi=lp64. It succeeds with later
versions of gas that supports -mabi.

Attached patch add checking for -mabi=lp64 and prompts upgradation. Is
this Ok?

Thanks,
Kugan

+2013-12-05  Kugan Vivekanandarajah  <address@hidden>
+       * configure.ac: Add checks for aarch64 assembler -mabi support.
+       * configure: Regenerate.
+

p.txt
Description: Text document