tests: simplify `pathhelp.pm`, avoid using external tools

Instead of calling the shell and external tools, rely on Perl functions
like `Cwd::getcwd()`, `Cwd::abs_path()`, `Cygwin::posix_

tests: simplify `pathhelp.pm`, avoid using external tools

Instead of calling the shell and external tools, rely on Perl functions
like `Cwd::getcwd()`, `Cwd::abs_path()`, `Cygwin::posix_to_win_path()`,
`Cygwin::win_to_posix_path()` to retrieve the current directory and
convert between POSIX and Windows formats.

This adds native Windows Perl support, avoids most failure modes and
makes format guessing and other internal functions unnecessary.

Also:
- delete unused `sys_native_path()`.
- delete redundant `normalize_path()` because Perl `abs_path()` already
does it.

Cherry-picked from #14949
Closes #15111

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wolfssl: convert malloc + memcpys to dynbuf for cipher string

Closes #15124

lib: avoid assigning 'result' temporarily

Closes #15122

multi: make multi_handle_timeout use the connect timeout

For all states before MSTATE_DO the connect timeout needs to be
considered.

Regression since #13371 (be659030ba078d6) sh

multi: make multi_handle_timeout use the connect timeout

For all states before MSTATE_DO the connect timeout needs to be
considered.

Regression since #13371 (be659030ba078d6) shipped in 8.8.0

Reported-by: Deniz Sökmen
Fixes #15100
Closes #15119

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GHA/labeler: adjust some docs patterns

Follow-up to 20aa8d8f31527 and 0e06603b23183 that moved and removed some
docs.

Closes #15121

tests: remove debug requirement on 38 tests

For all tests using -O that were previously relying on a debug build and
the CURL_TESTDIR environment variable, use the plain --output-dir opt

tests: remove debug requirement on 38 tests

For all tests using -O that were previously relying on a debug build and
the CURL_TESTDIR environment variable, use the plain --output-dir option
instead so that they can run proper in non-debug builds.

Closes #15114

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vtls: skip a "useless assignment"

Pointed out by CodeSonar

Closes #15117

tool: support --show-headers AND --remote-header-name

By keeping the headers in memory until we know the target file name,
then output them all.

Previously this option combinati

tool: support --show-headers AND --remote-header-name

By keeping the headers in memory until we know the target file name,
then output them all.

Previously this option combination would cause an error.

Add test 1310 and 1492 to verify. Adjusted test 1460 to work in the new
conditions.

Closes #15110

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GHA/macos: update comment with new Xcode default for macos-13 [ci skip]

GHA/macos: drop unsupported Xcode version references

Closes #15115

GHA/macos: delete `macos-12` jobs, update matrix for `macos-14`

- Days of `macos-12` are numbered:
https://github.com/actions/runner-images/issues/10721
Drop 5 affected jobs, rep

GHA/macos: delete `macos-12` jobs, update matrix for `macos-14`

- Days of `macos-12` are numbered:
https://github.com/actions/runner-images/issues/10721
Drop 5 affected jobs, replaced by `macos-15` ones added earlier today.

- Drop Xcode 14 and 16 from `macos-14` jobs.
Following up upstream announcement:
https://github.com/actions/runner-images/issues/10703
(No active jobs are affected by this.)

Follow-up to 4b4ff444dd68308e8938a1e5c33e0c8b9390d1da #15108
Closes #15113

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GHA/macos: Sequoia chores, fixes for llvm 18

- add `macos-15` Sequoia to combinations jobs.

- add `llvm@18` to combinations jobs for `macos-15`.

- fix cmake, autotools conf

GHA/macos: Sequoia chores, fixes for llvm 18

- add `macos-15` Sequoia to combinations jobs.

- add `llvm@18` to combinations jobs for `macos-15`.

- fix cmake, autotools configurations for llvm 18.
It requires `CMAKE_OSX_SYSROOT` for cmake, and `--sysroot` within `CC`
for both cmake and autotools.
(Also add `--target` to `CC` for all jobs.)

- stop `brew update` on `macos-12`.
`macos-12` is Monterey. Homebrew stopped providing binaries for it
after the latest macOS was out. It means newer versions of packages
have to be built from source, which is slow and undesired. Try to
avoid it using this trick. If it doesn't work, `macos-12` jobs will
have to be dropped.

- update Xcode support matrix.

Ref: https://github.com/actions/runner-images/blob/main/images/macos/macos-15-arm64-Readme.md
Closes #15108

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tests: fixup `checkcmd` `PATH` on non-unixy platforms

Do not add unixy system directories to `PATH` when looking up commands
on Windows, MS-DOS or OS/2.

Cherry-picked from #1494

tests: fixup `checkcmd` `PATH` on non-unixy platforms

Do not add unixy system directories to `PATH` when looking up commands
on Windows, MS-DOS or OS/2.

Cherry-picked from #14949
Closes #15106

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tests: fix shell quoting on native Windows Perl

Cherry-picked from #14949
Closes #15105

tests: fix `%POSIX_PWD` on native Windows Perl

Though this variable isn't used in any of the current tests.

Cherry-picked from #14949
Closes #15104

tests: replace `%PWD` with `%SSH_PWD` in SCP/SFTP tests

Cherry-picked from #14949
Closes #15103

RELEASE-NOTES: synced

CI: bump actions/checkout from 4.1.7 to 4.2.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.1.7 to 4.2.0.
- [Release notes](https://github.com/actions/checkout/rel

CI: bump actions/checkout from 4.1.7 to 4.2.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.1.7 to 4.2.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/692973e3d937129bcbf40652eb9f2f61becf3332...d632683dd7b4114ad314bca15554477dd762a938)

---
updated-dependencies:
- dependency-name: actions/checkout
dependency-type: direct:production
update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Closes #15095

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CI: bump github/codeql-action from 3.26.8 to 3.26.10

Bumps [github/codeql-action](https://github.com/github/codeql-action) from 3.26.8 to 3.26.10.
- [Release notes](https://github.com/gi

CI: bump github/codeql-action from 3.26.8 to 3.26.10

Bumps [github/codeql-action](https://github.com/github/codeql-action) from 3.26.8 to 3.26.10.
- [Release notes](https://github.com/github/codeql-action/releases)
- [Changelog](https://github.com/github/codeql-action/blob/main/CHANGELOG.md)
- [Commits](https://github.com/github/codeql-action/compare/294a9d92911152fe08befb9ec03e240add280cb3...e2b3eafc8d227b0241d48be5f425d47c2d750a13)

---
updated-dependencies:
- dependency-name: github/codeql-action
dependency-type: direct:production
update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Closes #15094

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docs/libcurl: expand multi documentation

curl_multi_init - mention the caches held by the handle

curl_multi_cleanup - mention that the socket callback might be invoked
by this f

docs/libcurl: expand multi documentation

curl_multi_init - mention the caches held by the handle

curl_multi_cleanup - mention that the socket callback might be invoked
by this function

Closes #15109

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select: use poll() if existing, avoid poll() with no sockets

poll() on macOS 10.12 was deemed broken in 2016 when we discovered that
it misbehaves when provided with no sockets to wait f

select: use poll() if existing, avoid poll() with no sockets

poll() on macOS 10.12 was deemed broken in 2016 when we discovered that
it misbehaves when provided with no sockets to wait for. The
HAVE_POLL_FINE is used to mark a poll() implementation that behaves
correctly: it *should* still wait the timeout time.

curl has therefore opted to use select() on Apple operating systems ever
since. To avoid the risk that this or other breakage cause problems.

However, using select() internally is also bad because it suffers from
problems when using file descriptors beyond 1024.

This change makes poll() used if it is present, but if there is no
sockets to wait for it avoids using poll() and instead falls back to
select() - but without any sockets to wait for there is no 1024 problem.

This removes all previous special-handling involving HAVE_POLL_FINE.

ref: https://daniel.haxx.se/blog/2016/10/11/poll-on-mac-10-12-is-broken/

Closes #15096

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ftp: fix 0-length last write on upload from stdin

When uploading FTP with unknown length, we write a last 0-length chunk
with the EOS flag set. OpenSSL's SSL_write() errors on such a wri

ftp: fix 0-length last write on upload from stdin

When uploading FTP with unknown length, we write a last 0-length chunk
with the EOS flag set. OpenSSL's SSL_write() errors on such a write.
Skip writing 0-length data to TLS backends instead.

Add test in FTPS for such uploads to verify.

Fixes #15101
Reported-by: Denis Goleshchikhin
Closes #15102

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tests: replace hard-coded `/dev/null` with variable

- add variable for the null device filename and use that in Perl code.
- initialize this variable with `NUL` on native Windows.
-

tests: replace hard-coded `/dev/null` with variable

- add variable for the null device filename and use that in Perl code.
- initialize this variable with `NUL` on native Windows.
- add `%DEV_NULL` variable and use it in tests.

Fixes `The system cannot find the path specified.` messages seen when
running `runtests.pl` with native Windows Perl.

Also adjust code to not break mcedit syntax highlighting.

Cherry-picked from #14949
Closes #15098

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tests: add and use `%PERL` variable to refer to the Perl binary

To ensure Perl invocations within tests call the same Perl binary used
for running the tests, as specified or auto-detecte

tests: add and use `%PERL` variable to refer to the Perl binary

To ensure Perl invocations within tests call the same Perl binary used
for running the tests, as specified or auto-detected via `PERL` env
(autotools) or `PERL_EXECUTABLE` setting (cmake). Instead of the first
`perl` executable found in `PATH`.)

Cherry-picked from #14949
Closes #15097

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tests: replace `%PWD` with `%FILE_PWD` for `file://`

Before this patch not all tests used `%FILE_PWD` with the `file://`
protocol.

Keep `%PWD` for test1145, to keep it fail on W

tests: replace `%PWD` with `%FILE_PWD` for `file://`

Before this patch not all tests used `%FILE_PWD` with the `file://`
protocol.

Keep `%PWD` for test1145, to keep it fail on Windows like the test
expects.

Cherry-picked from #14949

Closes #15090

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