build: add more supported attributes to the IAR compiler

Closes #13744

curl.h: change CURL_SSLVERSION_* from enum to defines

C++20 and later compilers emit a deprecation warning if values from two
different enums are combined with a bitwise operation the wa

curl.h: change CURL_SSLVERSION_* from enum to defines

C++20 and later compilers emit a deprecation warning if values from two
different enums are combined with a bitwise operation the way the
CURL_SSLVERSION_* values were previously created.

Reported-by: Michael Kaufmann
Fixes #13510
Closes #13511

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TLS: add support for ECH (Encrypted Client Hello)

An EXPERIMENTAL feature used with CURLOPT_ECH and --ech.

Closes #11922

curl_version_info: provide librtmp version

Ref: https://github.com/curl/curl/pull/13364#issuecomment-2054151942
Reported-by: talregev on github
Closes #13368

NTLM_WB: drop support

The feature has not worked for months and has been marked as DEPRECATED
for six+ months.

Closes #13249

CURLINFO_USED_PROXY: return bool whether the proxy was used

Adds test536 to verify

Closes #12719

curl.h: CURLOPT_DNS_SERVERS is only available with c-ares

Closes #12695

getinfo: CURLINFO_QUEUE_TIME_T

Returns the time, in microseconds, during which this transfer was held
in a waiting queue before it started "for real". A transfer might be put
in a qu

getinfo: CURLINFO_QUEUE_TIME_T

Returns the time, in microseconds, during which this transfer was held
in a waiting queue before it started "for real". A transfer might be put
in a queue if after getting started, it cannot create a new connection
etc due to set conditions and limits imposed by the application.

Ref: #12293
Closes #12368

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CURLOPT_SERVER_RESPONSE_TIMEOUT_MS: add

Proposed-by: Yifei Kong
Ref: https://curl.se/mail/lib-2023-11/0023.html
Closes #12369

curl.h: add CURLE_TOO_LARGE

A new error code to be used when an internal field grows too large, like
when a dynbuf reaches its maximum. Previously it would return
CURLE_OUT_OF_MEMORY

curl.h: add CURLE_TOO_LARGE

A new error code to be used when an internal field grows too large, like
when a dynbuf reaches its maximum. Previously it would return
CURLE_OUT_OF_MEMORY for this, which is highly misleading.

Ref: #12268
Closes #12269

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docs: make all examples in all libcurl man pages compile

Closes #12448

curl.h: delete Symbian OS references

curl deprecated Symbian OS in 3d64031fa7a80ac4ae3fd09a5939196268b92f81
via #5989. Delete references to it from public headers, because there
is n

curl.h: delete Symbian OS references

curl deprecated Symbian OS in 3d64031fa7a80ac4ae3fd09a5939196268b92f81
via #5989. Delete references to it from public headers, because there
is no fresh release to use those headers with.

Reviewed-by: Dan Fandrich
Reviewed-by: Jay Satiro
Closes #12378

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windows: use built-in `_WIN32` macro to detect Windows

Windows compilers define `_WIN32` automatically. Windows SDK headers
or build env defines `WIN32`, or we have to take care of it. T

windows: use built-in `_WIN32` macro to detect Windows

Windows compilers define `_WIN32` automatically. Windows SDK headers
or build env defines `WIN32`, or we have to take care of it. The
agreement seems to be that `_WIN32` is the preferred practice here.
Make the source code rely on that to detect we're building for Windows.

Public `curl.h` was using `WIN32`, `__WIN32__` and `CURL_WIN32` for
Windows detection, next to the official `_WIN32`. After this patch it
only uses `_WIN32` for this. Also, make it stop defining `CURL_WIN32`.

There is a slight chance these break compatibility with Windows
compilers that fail to define `_WIN32`. I'm not aware of any obsolete
or modern compiler affected, but in case there is one, one possible
solution is to define this macro manually.

grepping for `WIN32` remains useful to discover Windows-specific code.

Also:

- extend `checksrc` to ensure we're not using `WIN32` anymore.

- apply minor formatting here and there.

- delete unnecessary checks for `!MSDOS` when `_WIN32` is present.

Co-authored-by: Jay Satiro
Reviewed-by: Daniel Stenberg

Closes #12376

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curl.h: on FreeBSD include sys/param.h instead of osreldate.h

Should things build on Playstation as well

Fixes #12107
Reported-by: Faraz Fallahi
Closes #12123

spelling: fix codespell 2.2.6 typos

Closes #12019

curl.h: mark CURLSSLBACKEND_NSS as deprecated since 8.3.0

Closes #11905

CURLINFO_CERTINFO.3: better explain curl_certinfo struct

Closes https://github.com/curl/curl/pull/11666

gskit: remove

We remove support for building curl with gskit.

- This is a niche TLS library, only running on some IBM systems
- no regular curl contributors use this backend

gskit: remove

We remove support for building curl with gskit.

- This is a niche TLS library, only running on some IBM systems
- no regular curl contributors use this backend
- no CI builds use or verify this backend
- gskit, or the curl adaption for it, lacks many modern TLS features
making it an inferior solution
- build breakages in this code take weeks or more to get detected
- fixing gskit code is mostly done "flying blind"

This removal has been advertized in DEPRECATED in Jan 2, 2023 and it has
been mentioned on the curl-library mailing list.

It could be brought back, this is not a ban. Given proper effort and
will, gskit support is welcome back into the curl TLS backend family.

Closes #11460

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trace: make tracing available in non-debug builds

Add --trace-config to curl

Add curl_global_trace() to libcurl

Closes #11421

curl.h: include <sys/select.h> for vxworks

Closes #11356

lib: add CURLINFO_CONN_ID and CURLINFO_XFER_ID

- add an `id` long to Curl_easy, -1 on init
- once added to a multi (or its own multi), it gets
a non-negative number assigned by the

lib: add CURLINFO_CONN_ID and CURLINFO_XFER_ID

- add an `id` long to Curl_easy, -1 on init
- once added to a multi (or its own multi), it gets
a non-negative number assigned by the connection cache
- `id` is unique among all transfers using the same
cache until reaching LONG_MAX where it will wrap
around. So, not unique eternally.
- CURLINFO_CONN_ID returns the connection id attached to
data or, if none present, data->state.lastconnect_id
- variables and type declared in tool for write out

Closes #11185

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haproxy: add --haproxy-clientip flag to spoof client IPs

CURLOPT_HAPROXY_CLIENT_IP in the library

Closes #10779

CURLOPT_MAIL_RCPT_ALLOWFAILS: replace CURLOPT_MAIL_RCPT_ALLLOWFAILS

Deprecate the name using three Ls and prefer the name with two.

Replaces #10047
Closes #11218

CURLPROXY_HTTPS2: for HTTPS proxy that may speak HTTP/2

Setting this proxy type allows curl to negotiate and use HTTP/2 with
HTTPS proxies.

Closes #10900

openssl: interop with AWS-LC

* Configure changes to detect AWS-LC
* CMakeLists.txt changes to detect AWS-LC
* Compile-time branches needed to support AWS-LC
* Correctly set OSSL_

openssl: interop with AWS-LC

* Configure changes to detect AWS-LC
* CMakeLists.txt changes to detect AWS-LC
* Compile-time branches needed to support AWS-LC
* Correctly set OSSL_VERSION and report AWS-LC release number
* GitHub Actions script to build with autoconf and cmake against AWS-LC

AWS-LC is a BoringSSL/OpenSSL derivative
For more information see https://github.com/awslabs/aws-lc/

Closes #10320

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