Re: problem building libavcodec59-5.0-shlibs on MacOS 10.11 (El Cap) / Xcode 8.2.1

On 4/28/22 8:03 AM, Scott Hannahs via Fink-users wrote:
>> On Apr 27, 2022, at 05:28, Hanspeter Niederstrasser <[email protected]> wrote:
>>
>> On 4/26/22 9:41 PM, Scott Hannahs via Fink-users wrote:
>>>> On Apr 26, 2022, at 9:06 PM, Hanspeter Niederstrasser <[email protected]> wrote:
>>>>
>>>> Can you selfupdate and try libavcodec59-5.0-shlibs-5.0.1-1 ? I don't know if that was fixed there but might as well try.
>>>>
>>>> Hanspeter
>>> I get the same sort of thing…   My bad not self updating, I had this error and then didn’t get back to it for awhile.  I hadn’t seen an update to that particular library.  Possibly ffmpeg 5.0 can’t be built on Mac OS 10.11??
>>> -Scott
>>> src/libavfilter/metal/utils.h:50:40: error: expected function body after function declarator
>>>                                         API_AVAILABLE(macos(10.11), ios(8.0));
>>>                                         ^
>>> src/libavfilter/metal/utils.h:57:48: error: expected function body after function declarator
>>>                                                 API_AVAILABLE(macos(10.11), ios(8.0));
>>>                                                 ^
>>> src/libavfilter/metal/utils.m:22:6: error: no previous prototype for function 'ff_metal_compute_encoder_dispatch' [-Werror,-Wmissing-prototypes]
>>> void ff_metal_compute_encoder_dispatch(id<MTLDevice> device,
>>>       ^
>>> src/libavfilter/metal/utils.m:50:19: error: no previous prototype for function 'ff_metal_texture_from_pixbuf' [-Werror,-Wmissing-prototypes]
>>> CVMetalTextureRef ff_metal_texture_from_pixbuf(void *ctx,
>>>                    ^
>>> 4 errors generated.
>>> make: *** [/sw/src/fink.build/libavcodec59-5.0-shlibs-5.0.1-1/ffmpeg-5.0.1/ffbuild/common.mak:84: libavfilter/metal/utils.o] Error 1
>>> make: Leaving directory '/sw/src/fink.build/libavcodec59-5.0-shlibs-5.0.1-1/ffmpeg-5.0.1/finkbuild'
>>> ### execution of /tmp/fink.eLCzD failed, exit code 2
>>> ### execution of /tmp/fink.OBhj3 failed, exit code 2
>>
>> Does it work if you add this line to PatchScript?
>>
>> perl -ni -e 'print unless /    check_cflags -Werror=missing-prototypes/‘ configure
> 
> No, I get the same error.
> 
> gcc -I. -Isrc/ -I/sw/include -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -I/sw/src/fink.build/libavcodec59-5.0-shlibs-5.0.1-2/ffmpeg-5.0.1/compat/dispatch_semaphore -DPIC -DZLIB_CONST -DHAVE_AV_CONFIG_H -DBUILDING_avfilter -fno-stack-check -I/sw/lib/libspeex1/include -I/sw/include -I/opt/X11/include -std=c11 -Werror=partial-availability -fomit-frame-pointer -fPIC -I/opt/X11/include -I/opt/X11/include -I/opt/X11/include -pthread -I/sw/include -I/sw/include -I/s                                       ^
> src/libavfilter/metal/utils.h:57:48: error: expected function body after function declarator
>                                                 API_AVAILABLE(macos(10.11), ios(8.0));
>                                                 ^
> src/libavfilter/metal/utils.m:22:6: warning: no previous prototype for function 'ff_metal_compute_encoder_dispatch' [-Wmissing-prototypes]
> void ff_metal_compute_encoder_dispatch(id<MTLDevice> device,
>       ^
> src/libavfilter/metal/utils.m:50:19: warning: no previous prototype for function 'ff_metal_texture_from_pixbuf' [-Wmissing-prototypes]
> CVMetalTextureRef ff_metal_texture_from_pixbuf(void *ctx,
>                    ^
> 2 warnings and 2 errors generated.
> 
> I am unclear on the dependencies here.  I think the main program I installed was ffmpeg.  Now in updating it is trying to update libavcodec59 but in doing so it is building the code from within ffmpeg as a subdirectory.  If I read the error correctly it is not the missing-prototype but the "error: expected function body after function declarator”.

Ffmpeg is the primary end user package. But the parent package is called 
libavcodec59-5.0-shlibs to simplify package maintenance.

As to the errors, there are apparently 2 errors currently in the 5.0.1 
code under macOS 10.11 and earlier. The 2nd error got fixed by not 
erroring out on missing-prototypes (removed by the perl-pie from my 
previous email).

That still leaves the other error around the API_AVAILABLE() function 
declaration. That macro should be available by default via the OS. Do 
you have the file /usr/include/os/availability? It might be 
Availability.h (with a capital A)? If so, does it "#define 
API_AVAILABLE(...)" around line 60?

Lastly, what does `gcc --version` say?

Hanspeter

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