[FFmpeg-devel] [PATCH] configure: check SDL2 function with a header

[KO Myung-Hun]

Hi/2.

Derek Buitenhuis wrote:
> On 12/28/2017 2:44 PM, KO Myung-Hun wrote:
>> On OS/2, '_' is not prepended to a function name.
>> ---
>>  configure | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> It's not immediately clear to be how checking a header instead relates
> to function name mangling (or lack thereof)?

Sorry about that.

SDL2 uses SDLCALL to specify a calling convention. On OS/2, it's defined
to `_System' which is similar to `_cdecl' but does not prepend '_'.

After all, without a header, a function is used without `_System'. And
linker will try to `_func' but fail because the function is `func' not
`_func'.

-- 
KO Myung-Hun

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