[FFmpeg-cvslog] r20101 - trunk/configure

[Måns Rullgård]

Reimar D?ffinger <Reimar.Doeffinger at gmx.de> writes:

> On Wed, Sep 30, 2009 at 06:55:32PM +0200, reimar wrote:
>> Author: reimar
>> Date: Wed Sep 30 18:55:32 2009
>> New Revision: 20101
>> 
>> Log:
>> Use a "b" constraint instead of ebx clobber to detect if EBX is available.
>> The test using clobber incorrectly indicates ebx to be available with the
>> default compilers on OpenBSD 4.5 and Haiku.
>
> Great, now I broken OSX 64 bit.
> This change makes them work both (and no, my original variant with =b
> does not work either for OSX).
> I'm not sure if it has something to do with -mdynamic-no-pic, but it all
> doesn't make much sense.
> Index: configure
> ===================================================================
> --- configure   (revision 20101)
> +++ configure   (working copy)
> @@ -2163,6 +2163,7 @@
>
>      # check whether EBX is available on x86
>      check_asm ebx_available '""::"b"(0)'
> +    enabled ebx_available && check_asm ebx_available '"":::"%ebx"'
>
>      # check whether more than 10 operands are supported
>      check_cc <<EOF && enable ten_operands

This will disable it everywhere, since nothing else ever enables it.

What exactly is happening on OSX?  Did the original test work?
Assuming it did, maybe you can simply put back the ebx clobber in
addition to the "b" operand.

-- 
M?ns Rullg?rd
mans at mansr.com