[snip]

>> diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
>> index b1b4eef..a53febc 100644
>> --- a/gcc/config/aarch64/aarch64.c
>> +++ b/gcc/config/aarch64/aarch64.c
>> @@ -5187,6 +5187,13 @@ aarch64_override_options (void)
>>         aarch64_parse_tune ();
>>       }
>>
>> +/* Issue error if assembler does not support -mabi and option ilp32
>> +  is selected.  */
>
>I'd prefer the comment to be "The compiler may have been configured
>with 2.23.* binutils, which does not have support for ILP32."


>> +#ifndef HAVE_AS_MABI_OPTION
>> +  if (TARGET_ILP32)
>> +    error ("Assembler does not supprt -mabi=ilp32");
>> +#endif
> 
> supprt/support
> 
[snip]

> I'm not very sure about the indent rules for configury files, but in
> other areas of configure.ac, it seems using a similar indent convention
> as in .c files.
> 

Thanks Yufeng. I have updated the patch based on the comments above.

Marcus, is this OK for trunk now?

Thanks,
Kugan


gcc/

+2013-12-11  Kugan Vivekanandarajah  <kuganv@linaro.org>
+	* configure.ac: Add check for aarch64 assembler -mabi support.
+	* configure: Regenerate.
+	* config.in: Regenerate.
+	* config/aarch64/aarch64-elf.h (ASM_MABI_SPEC): New define.
+	(ASM_SPEC): Update to substitute -mabi with ASM_MABI_SPEC.
+	* config/aarch64/aarch64.h (aarch64_override_options):  Issue error if
+	assembler does not support -mabi and option ilp32 is selected.
+	* doc/install.texi: Added note that building gcc 4.9 and after with pre
+	2.24 binutils will not support -mabi=ilp32.
+