I just noticed that since Alpine release 3.16.x the curl option
--dns-server does not work anymore. The following error message is
curl: option --dns-server: the installed libcurl version
doesn't support this
After some investigation I found that Curl (7.83.x) changed how the
build manages c-ares.
configure: remove support for "embedded ares" #8397
Based on the commit comment the option --enable-ares must now be
I'm now wondering how to proceed. Is this something that can be
changed in Alpine? Should a defect be opened? Submit a patch? What
would be the preferred method?
Thank you in advance,
Avis de confidentialité
informations contenues dans le présent
message et dans toute pièce qui
lui est jointe sont confidentielles et
peuvent être protégées par le
secret professionnel. Ces informations sont
à l’usage exclusif de son ou
de ses destinataires. Si vous recevez ce
message par erreur, veuillez
s’il vous plait communiquer immédiatement
avec l’expéditeur et en
détruire tout exemplaire. De plus, il vous est
strictement interdit de
le divulguer, de le distribuer ou de le reproduire
de l’expéditeur. Merci.
e-mail message and any attachment hereto contain confidential
which may be privileged and which is intended for the
exclusive use of its
addressee(s). If you receive this message in error,
please inform sender
immediately and destroy any copy thereof.
Furthermore, any disclosure,
distribution or copying of this message
and/or any attachment hereto
without the consent of the sender is
strictly prohibited. Thank you.
On Fri, Jan 13, 2023 at 12:01:12PM -0500, Frederick Lafleche wrote:
> I just noticed that since Alpine release 3.16.x the curl option
> --dns-server does not work anymore. The following error message is
> curl: option --dns-server: the installed libcurl version
> doesn't support this
> After some investigation I found that Curl (7.83.x) changed how the
> build manages c-ares.
> configure: remove support for "embedded ares" #8397
> Based on the commit comment the option --enable-ares must now be
> explicitly given.
> I'm now wondering how to proceed. Is this something that can be
> changed in Alpine? Should a defect be opened? Submit a patch? What
> would be the preferred method?
> Thank you in advance,
If I look at the buildlogs for curl on 3.15 or 3.14, I see:
> checking whether to enable c-ares for DNS lookups... no
so c-ares was not enabled then either. The pull request that you refer
> In March 2010 (commit 4259d2d) we removed the embedded 'ares'
> directory from the curl source tree
So c-ares was already not embedded for a long time, and hence, could not
have been used.
The history of the curl package also does not show c-ares was ever
pulled in as a dependency. So my conclusion is that whatever has changed
since 3.16, it's not the lack of c-ares that causes the issue.
Comparing the configure output of those buildlogs, I do not see any
obvious differences which could explain why it's no longer supported.
This issue mentions:
> The option --dns-servers only works if libcurl was built to use c-ares
> and it seems your build does not. Previously curl would just silently
> ignore that problem, but it still wouldn't (couldn't) use the option.
So apparently, it would have never worked, curl just didn't complain