[FFmpeg-devel] [PATCH] Use __clang_version__ when available

[Måns Rullgård]

David Conrad <lessen42 at gmail.com> writes:

> On Jun 29, 2010, at 7:29 AM, M?ns Rullg?rd wrote:
>
>> David Conrad <lessen42 at gmail.com> writes:
>> 
>>> ---
>>> configure |    2 +-
>>> 1 files changed, 1 insertions(+), 1 deletions(-)
>>> 
>>> diff --git a/configure b/configure
>>> index 60775b5..8aebe5a 100755
>>> --- a/configure
>>> +++ b/configure
>>> @@ -1752,7 +1752,7 @@ elif $cc -version 2>/dev/null | grep -q TMS470; then
>>>     }
>>> elif $cc -v 2>&1 | grep -q clang; then
>>>     cc_type=clang
>>> -    cc_version=__VERSION__
>>> +    check_cpp_condition stdlib.h "defined(__clang_version__)" && cc_version=__clang_version__ || cc_version=__VERSION__
>> 
>> Is __clang_version__ ever undefined?
>
> Yes, in any clang older than ~2 months, including all official releases.

You're not allowed to run the compiler at that point since some things
haven't been set up properly yet.  Does the following work?

$cc -dM -E $TMPC | grep -q __clang_version__ && ... || ...

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