[FFmpeg-devel] [PATCH] Enable building 64bit FFmpeg on MacOSX

Måns Rullgård mans
Mon Mar 17 11:34:12 CET 2008

Diego Biurrun wrote:
> On Mon, Mar 17, 2008 at 11:28:30AM +0200, ?smail D?nmez wrote:
>> On Mon, Mar 17, 2008 at 11:25 AM, Diego Biurrun <diego at biurrun.de> wrote:
>> > On Sat, Mar 15, 2008 at 05:03:22PM +0200, ?smail D?nmez wrote:
>> >  > To workaround this attached patch checks if CFLAGS contains -m64 and
>> >  > then sets 64bit flags. This is similar to already existing -m32 check
>> >  > in configure.
>> >
>> >  I'd rather have you find a proper solution, this is quite ugly...
>> Suggestions welcome.
> Mans?
> I have no better solutions available, so I'll apply your patch if you
> update it to match HEAD again.  Unless somebody has better ideas...

The correct way would be to try compiling something that will fail on
one arch or the other.  It's a trivial bit of assembler (use %rax or so),
but there is plain C code using the HAVE_FAST_64BIT flag, which would
get the wrong value if inline asm is not supported.  Another possibility
might be to check the size of long and/or pointer types (using nm).

M?ns Rullg?rd
mans at mansr.com

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