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asyn-thread: use c-ares to resolve HTTPS RR

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Allow building with c-ares and yet use threaded resolver for the main
host A/AAAA resolving:

  `--with-ares` provides the c-ares install path and defaults to use
  c-ares for name resolving

  `--with-threaded-resolver` still uses c-ares in the build (for HTTPS)
  but uses the threaded resolver for "normal" resolves.

It works similarly for cmake: ENABLE_ARES enables ares, and if
ENABLE_THREADED_RESOLVER also is set, c-ares is used for HTTPS RR and
the threaded resolver for "normal" resolves.

HTTPSRR and c-ares-rr are new features return by curl_version_info() and
thus shown by curl -V.

The c-ares-rr feature bit is there to make it possible to distinguish
between builds using c-ares for all name resolves and builds that use
the threaded resolves for the regular name resolves and c-ares for
HTTPSRR only. "c-ares-rr" means it does not use c-ares for "plain" name
resolves.

HTTPSRR support is EXPERIMENTAL only.

Closes #16054
This commit is contained in:
Daniel Stenberg 2025-01-21 11:42:20 +01:00
parent 520e67dd39
commit 0d4fdbf15d
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18 changed files with 470 additions and 421 deletions
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2
tests/data/test1014
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@ -28,7 +28,7 @@ Compare curl --version with curl-config --features
# Verify data after the test has been "shot"
<verify>
<postcheck>
%SRCDIR/libtest/test1013.pl ../curl-config %LOGDIR/stdout%TESTNUMBER features
%SRCDIR/libtest/test1013.pl ../curl-config %LOGDIR/stdout%TESTNUMBER features > %LOGDIR/result%TESTNUMBER
</postcheck>
<errorcode>
0