[FFmpeg-devel] [PATCH] Update configure file to fix a build failure with gcc-11 on Ubuntu 21.10

[Gianfranco Costamagna]

Hello Timo

Il giorno sab 18 set 2021 alle ore 13:15 Timo Rothenpieler <
timo at rothenpieler.org> ha scritto:

> On 18.09.2021 11:06, Gianfranco Costamagna wrote:
> > New gcc changed the way it exposes armhf build flags.
> > "the architecture now has to include the cpu features, see the man page,
> arM options"
> >
> > example of build failure:
> >
> https://launchpad.net/ubuntu/+source/ffmpeg/7:4.4-6ubuntu1/+build/22070856
> >
> > Note: this syntax was introduced in GCC 8
> https://gcc.gnu.org/gcc-8/changes.html
> > ---
> >   configure | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/configure b/configure
> > index 7ac23123c7..571b70208c 100755
> > --- a/configure
> > +++ b/configure
> > @@ -5000,7 +5000,7 @@ elif enabled arm; then
> >           elif check_arm_arch 6ZK;      then echo armv6zk
> >           elif check_arm_arch 6T2;      then echo armv6t2
> >           elif check_arm_arch 7;        then echo armv7
> > -        elif check_arm_arch 7A  7_A;  then echo armv7-a
> > +        elif check_arm_arch 7A  7_A;  then echo armv7-a+fp
> >           elif check_arm_arch 7S;       then echo armv7-a
> >           elif check_arm_arch 7R  7_R;  then echo armv7-r
> >           elif check_arm_arch 7M  7_M;  then echo armv7-m
> >
>
> Does this still work with older gccs, or will those be broken after this?
>

I checked gcc-10 and it works too.
The new naming has been introduced in gcc-8, so there should be no issues
even for backporting the package to old systems.

What is the oldest supported compiler for ffmpeg?

BTW this is just an idea of a patch, other people might want to patch all
the arms for the new gcc-11, but I don't know how to change them because I
don't have the hardware
so I just patched the Debian/Ubuntu used one.

Feel free to change it if you like, or just take it as reference for people
experiencing build failures with gcc-11. Hopefully somebody with the
required hw will patch it in a better way once the gcc-11 becomes default
on more systems.

I sent a new patch version with different commit message.
Gianfranco


> ________________
>
_______________________________
> ffmpeg-devel mailing list
> ffmpeg-devel at ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request at ffmpeg.org with subject "unsubscribe".
>