[FFmpeg-devel] ICC version checks

[Måns Rullgård]

Frank Barchard <fbarchard at google.com> writes:

> On Tue, Mar 9, 2010 at 9:43 AM, M?ns Rullg?rd <mans at mansr.com> wrote:
>
>> Frank Barchard <fbarchard at google.com> writes:
>>
>> > This is Intel's response
>> >
>> > "I am not sure if Mans has found something specific but yes some
>> > of the previous versions of icc were not compatible with some of
>> > the versions of gcc.  It was typically a mix and match of the
>> > static libraries between being built with icc an gcc.  Libraries
>> > being called between monolithic .so to executable etc was
>> > typically okay to do.  It just depends on when the code migrates
>> > from one compiler e.g. gcc to icc the other or visa versa.  For
>> > example icc 9.1 was not compatible with gcc 4.2 if I remember
>> > correctly.  We have tried to stay compatible with gcc but it
>> > isn't always possible."
>>
>> That seems to be talking about binary compatibility, probably with
>> libgcc and libstdc++.  I'm talking about frontend compatibility with
>> language extensions such as attributes.  If icc claims to be
>> compatible with whatever random gcc version I happen to have
>> installed, there is no way it can be true in general.  The correct
>> thing for icc to do would be reporting the latest gcc version it is
>> known to be fully compatible with.  That is what most other compilers
>> (try to) do.
>>
>
> I'll pass that along to their compiler team.
>
> But as is, ICC reports the back end gcc libs it will use.
> You can infer the front end compatibility from the __ICC version.
> So maybe the ifdefs should be rewritten
>
> from
> #if (!defined(__ICC) || __ICC > 1110) && AV_GCC_VERSION_AT_LEAST(4,3)
>
> to
> #if __ICC > 1110 || (!defined(__ICC) && AV_GCC_VERSION_AT_LEAST(4,3))
>
> so you'll need either native gcc 4.3 or icc 11.1

So icc 11.1 is compatible with gcc 4.3?  What about other versions?
What minimum icc version is compatible with gcc 3.4?  With 4.1?  Etc.

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