cmake: allow building tests in unity mode

Makes building tests noticeably faster.

Apply changes/fixes/workarounds to make Unity work:
- rename test variables to avoid collisions

cmake: allow building tests in unity mode

Makes building tests noticeably faster.

Apply changes/fixes/workarounds to make Unity work:
- rename test variables to avoid collisions or shadowing each other when
combined into single units.
- add workaround to avoid applying `lib/memdebug.h` overrides to system
headers declaring/defining `getaddrinfo()`/`freeaddrinfo()` for
`tests/server/resolve.c`. This replaces a previous workaround that
worked for that specific source.
- rename test macro `CTRL` clashing with Cygwin `sys/ioctl.h`.
- add include guard to `test.h`.

Also:
- exclude `tests/http/clients` which are all single-source. (like
`docs/examples`.)

Build time improvements for tests:
- AppVeyor CI:
- MSVC 2008, 2010: 1 minute faster (4m8s -> 2m56s, 3m19s -> 2m24s)
- MSVC 2022 arm64: 3.5 minutes faster (10m18s -> 6m48s)
before: https://ci.appveyor.com/project/curlorg/curl/builds/50522785
after: https://ci.appveyor.com/project/curlorg/curl/builds/50522942
- GHA:
- Cygwin: 1.5 minutes faster (3m13s -> 1m43s)
before: https://github.com/curl/curl/actions/runs/10681535327/job/29605384398
after: https://github.com/curl/curl/actions/runs/10680818726/job/29603130637
- Windows:
before: https://github.com/curl/curl/actions/runs/10680818713
after: https://github.com/curl/curl/actions/runs/10683850187
- MSYS2, mingw-w64: 1 minute faster
- MSVC: 30 seconds faster (3m17s -> 2m48s)
- macOS: double speed (39s -> 18s)
before: https://github.com/curl/curl/actions/runs/10680818753/job/29603133447
after: https://github.com/curl/curl/actions/runs/10683850174/job/29612914515
- Linux: almost double speed (30/31s -> 18s)
before: https://github.com/curl/curl/actions/runs/10681535311/job/29605387156
after: https://github.com/curl/curl/actions/runs/10680818721/job/29603133976
- non-native: no obvious effect.
before: https://github.com/curl/curl/actions/runs/10680818722
after: https://github.com/curl/curl/actions/runs/10683850187
- Old Linux: Unity mode not supported by old CMake, no effect.

Closes #14765

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cmake: minor tidy-ups

- show `OpenSSL v3+` when detected (as in `./configure`).
(this string also makes its way to `curl-config`.)
- prefer `unset(VAR)` over `set(VAR)`.
Same

cmake: minor tidy-ups

- show `OpenSSL v3+` when detected (as in `./configure`).
(this string also makes its way to `curl-config`.)
- prefer `unset(VAR)` over `set(VAR)`.
Same effect, but `unset()` tells the intent unambiguously.
https://cmake.org/cmake/help/latest/command/set.html
- drop "implementation" from an `option()` description.
- FindGSS: replace legacy keyword alias with modern alternative.
https://cmake.org/cmake/help/latest/command/get_filename_component.html
- move `CURL_STATIC_CRT` logic next to its `option()`.
- improve order of `libcurl.pc`/`curl-config` variable init lines.
- tests: drop/shorten custom target names.
They inflated generated make files by 550KB.
Keep target name logic for sync between code snippets.
Follow-up to a2ef5d36b3cdec8120a4a9b782d18d58a70d4236 #14660
- clear a variable after use.
- restore `STATUS` for `Features:`/`Protocols:` `message()`s:
Without it the output goes to stderr, and appears in red in CMake GUI.
It doesn't seem possible to show a line on stdout without leading
underscores to match `curl -V` and `./configure` output.
Partial revert of acbc6b703f6b0ee568d053f6f2565fbc107b5fd3 #14197
- WindowsCache: move `HAVE_LINUX_TCP_H` into the header group.
- move strings to the same line as their `STRING` keyword.
- formatting in generated code.
- delete bogus comment.
- unfold lines for readability.
- fix a too long line. (for cmakelint)
- missing quotes, whitespace, comments.

Closes #14610

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cmake: sync code between test/example targets

- reuse local variable names.
- sync `PROJECT_LABEL`, add where missing.
- namespace all target names.
- bind header directories to

cmake: sync code between test/example targets

- reuse local variable names.
- sync `PROJECT_LABEL`, add where missing.
- namespace all target names.
- bind header directories to each target.
- tests/server: limit `CURL_STATICLIB` to Windows (as in autotools.)
- drop functions with a single caller.

Closes #14660

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cmake: fix and tidy up c-ares builds, enable in more CI jobs

- set `CARES_NO_DEPRECATED` to avoid c-ares deprecation warnings.
Like autotools does.

- drop unused c-ares header

cmake: fix and tidy up c-ares builds, enable in more CI jobs

- set `CARES_NO_DEPRECATED` to avoid c-ares deprecation warnings.
Like autotools does.

- drop unused c-ares header directory when building libtests and test
servers.

- disable TrackMemory (aka `CURLDEBUG`) feature for MSVC builds.
It fails on test 558 and 1330, saying that TrackMemory isn't working.
Left a FIXME about it.

- GHA/macos: enable c-ares in a cmake job.

- GHA/windows: enable c-ares in MSVC job.
Fixes #14202

- GHA/windows: add c-ares mingw autotools job with tests.
(move `--with-windows-unicode` option from 'default' job to
this one to keep the former "default".)
Put these tests on ignore for now:
```
FAIL 472: 'aws-sigv4 with query' HTTP, aws-sigv4
FAIL 1299: 'Send "OPTIONS *" with --request-target' HTTP, --request-target
FAIL 1613: 'Send "OPTIONS *" with --request-target to a proxy' HTTP, HTTP proxy, --request-target
```
Ref: https://github.com/curl/curl/actions/runs/10388126947/job/28765761441#step:15:5902

472: fails with mingw despite Unicode enabled.
1299, 1613: seem like a case of expanding '*' to a filename.

- GHA/windows: enable c-ares in mingw cmake job.

Closes #14541

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cmake: sync up result variable names in Find modules

- bearssl, c-ares, gss, libpsl, libssh2, mbedtls:
Before this patch these Find modules returned results via
`<NAME>_INCLUDE_D

cmake: sync up result variable names in Find modules

- bearssl, c-ares, gss, libpsl, libssh2, mbedtls:
Before this patch these Find modules returned results via
`<NAME>_INCLUDE_DIR` and `<NAME>_LIBRARY`.

This patch makes them return `<NAME>_INCLUDE_DIRS` (note the `S`)
and `<NAME>_LIBRARIES` like other modules already did.

- bearssl, mbedtls:
Before this patch these Find modules allowed custom configuration
via `<NAME>_INCLUDE_DIRS` (note the `S`).

This patch makes them accept `<NAME>_INCLUDE_DIR`, like the rest of
the modules did.

Deprecate the old variables, but keep accepting them for
compatibility.

- bearssl: add missing `mark_as_advanced()` call.

Closes #14542

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cmake: more syntax tidy-up

- quote string literals.
In the hope it improves syntax-highlighting and readability.

- use lowercase, underscore-prefixed local var names.
As

cmake: more syntax tidy-up

- quote string literals.
In the hope it improves syntax-highlighting and readability.

- use lowercase, underscore-prefixed local var names.
As a hint for scope, to help readability.

- prefer `pkg_search_module` (over `pkg_check_modules`).
They are the same, but `pkg_search_module` stops searching
at the first hit.

- more `IN LISTS` in `foreach()`.

- OtherTests.cmake: clear `CMAKE_EXTRA_INCLUDE_FILES` after use.

- add `PROJECT_LABEL` for http/client and unit test targets.

- sync `Find*` module comments and formatting.

- drop a few local variables.

- drop bogus `CARES_LIBRARIES` from comment.

- unquote numeric literal.

Follow-up to acbc6b703f6b0ee568d053f6f2565fbc107b5fd3 #14197
Closes #14388

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cmake: delete MSVC warning suppression for tests/server

Server code no longer produces this warning.

Closes #14428

cmake: cleanup header paths

- sync build-dir/source-dir header path order with autotools, by
including build-dir first, then source-dir.
This prevents out-of-tree builds breaking

cmake: cleanup header paths

- sync build-dir/source-dir header path order with autotools, by
including build-dir first, then source-dir.
This prevents out-of-tree builds breaking due to leftover generated
headers in the source tree.

- tests/unit: move `src` ahead of `libtest` in header path, syncing with
autotools.

- stop adding non-existing generated `include` dir to header path.
There are no generated `include` headers and this directory is either
missing in out-of-tree builds or the same as the one already added
globally via the root `CMakeLists.txt`.

- lib: stop adding a duplicate source include directory to the header
path.
It's already added globally via the root `CMakeLists.txt`.

- lib: stop adding the project root to the header path.

- docs/examples: drop internal header paths.
Examples do not and should not use internal headers.

- replace `curl_setup_once.h` in comments with `curl_setup.h`,
the header actually used, and also referred to in autotools comments.

- add comment why we need `src` in include path for `tests/server`.

- add quotes around header directories.

Closes #14416

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cmake: tidy-ups

- tidy-up comments.
- use lowercase, underscore prefixed names for internal variables.
- use `IN LISTS` and `IN ITEMS` in `foreach()` loops.
- rename variable nam

cmake: tidy-ups

- tidy-up comments.
- use lowercase, underscore prefixed names for internal variables.
- use `IN LISTS` and `IN ITEMS` in `foreach()` loops.
- rename variable name `OUTPUT` to a more distinctive one.
- tidy-up `STREQUAL` syntax.
- delete commented code.
- indent/whitespace.

Closes #14197

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cmake: drop unused internal variable

Closes #14361

cmake: whitespace, formatting/tidy-up in comments

Also correct casing in a few option descriptions.

Closes #13711

cmake: support building static and shared libcurl in one go

This patch adds the ability to build a static and shared libcurl library
in a single build session. It also adds an option to

cmake: support building static and shared libcurl in one go

This patch adds the ability to build a static and shared libcurl library
in a single build session. It also adds an option to select which one to
use when building the curl executable.

New build options:
- `BUILD_STATIC_LIBS`. Default: `OFF`.
Enabled automatically if `BUILD_SHARED_LIBS` is `OFF`.
- `BUILD_STATIC_CURL`. Default: `OFF`.
Requires `BUILD_STATIC_LIBS` enabled.
Enabled automatically if building static libcurl only.
- `STATIC_LIB_SUFFIX`. Default: empty.
- `IMPORT_LIB_SUFFIX`. Default: `_imp` if implib filename would collide
with static lib name (typically with MSVC) in Windows builds.
Otherwise empty.

Also:

- Stop setting the `CURL_STATICLIB` macro via `curl_config.h`, and pass
it directly to the compiler. This also allows to delete a condition
from `tests/server/CMakeLists.txt`.

- Complete a TODO by following the logic used in autotools (also for
`LIBCURL_NO_SHARED`), and set `-DCURL_STATICLIB` in `Cflags:` of
`libcurl.pc` for _static-only_ curl builds.

- Convert an existing CI test to build both shared and static libcurl.

Closes #11505

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copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- save

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING

checksrc is updated to allow non-year using copyright statements

Closes #10205

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test644: verify --xattr (with redirect)

copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the

copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the file
`.reuse/dep5`.

This commit also adds a Github workflow to check pull requests and adapts
copyright.pl to the changes.

Closes #8869

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curl.se: new home

Closes #6172

CMake: do not build test programs by default

The default target should only build libcurl and curl. Add a dedicated
'testdeps' target which will be used later when running tests. Note th

CMake: do not build test programs by default

The default target should only build libcurl and curl. Add a dedicated
'testdeps' target which will be used later when running tests. Note that
unittests are currently broken in CMake and already excluded.

Closes #5368

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copyright: fix out-of-date copyright ranges and missing headers

Reported by the new script 'scripts/copyright.pl'. The script has a
regex whitelist for the files that don't need copyrigh

copyright: fix out-of-date copyright ranges and missing headers

Reported by the new script 'scripts/copyright.pl'. The script has a
regex whitelist for the files that don't need copyright headers.

Removed three (mostly usesless) README files from docs/

Closes #5141

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build: Disable Visual Studio warning "conditional expression is constant"

- Disable warning C4127 "conditional expression is constant" globally
in curl_setup.h for when building with M

build: Disable Visual Studio warning "conditional expression is constant"

- Disable warning C4127 "conditional expression is constant" globally
in curl_setup.h for when building with Microsoft's compiler.

This mainly affects building with the Visual Studio project files found
in the projects dir.

Prior to this change the cmake and winbuild build systems already
disabled 4127 globally for when building with Microsoft's compiler.
Also, 4127 was already disabled for all build systems in the limited
circumstance of the WHILE_FALSE macro which disabled the warning
specifically for while(0). This commit removes the WHILE_FALSE macro and
all other cruft in favor of disabling globally in curl_setup.

Background:

We have various macros that cause 0 or 1 to be evaluated, which would
cause warning C4127 in Visual Studio. For example this causes it:

#define Curl_resolver_asynch() 1

Full behavior is not clearly defined and inconsistent across versions.
However it is documented that since VS 2015 Update 3 Microsoft has
addressed this somewhat but not entirely, not warning on while(true) for
example.

Prior to this change some C4127 warnings occurred when I built with
Visual Studio using the generated projects in the projects dir.

Closes https://github.com/curl/curl/pull/4658

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whitespace fixes

- replace tabs with spaces where possible
- remove line ending spaces
- remove double/triple newlines at EOF
- fix a non-UTF-8 character
- cleanup a few inde

whitespace fixes

- replace tabs with spaces where possible
- remove line ending spaces
- remove double/triple newlines at EOF
- fix a non-UTF-8 character
- cleanup a few indentations/line continuations
in manual examples

Closes https://github.com/curl/curl/pull/3037

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CMake: Respect BUILD_SHARED_LIBS

Use standard CMake variable BUILD_SHARED_LIBS instead of introducing
custom option CURL_STATICLIB.

Use '-DBUILD_SHARED_LIBS=%SHARED%' in appveyo

CMake: Respect BUILD_SHARED_LIBS

Use standard CMake variable BUILD_SHARED_LIBS instead of introducing
custom option CURL_STATICLIB.

Use '-DBUILD_SHARED_LIBS=%SHARED%' in appveyor.yml.

Reviewed-by: Sergei Nikulov
Closes #2755

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CMake: Update scripts to use consistent style

Closes #2727
Reviewed-by: Sergei Nikulov

cmake: set -d postfix for debug builds if not specified
using -DCMAKE_DEBUG_POSTFIX explicitly

fixes #2121, obsoletes #2384

spelling fixes

Detected using the `codespell` tool.

Also contains one URL protocol upgrade.

Closes https://github.com/curl/curl/pull/2334

CMake: set MSVC warning level to 4

The MSVC warning level defaults to 3 in CMake. Change it to 4, which is
consistent with the Visual Studio and NMake builds. Disable level 4
warning

CMake: set MSVC warning level to 4

The MSVC warning level defaults to 3 in CMake. Change it to 4, which is
consistent with the Visual Studio and NMake builds. Disable level 4
warning C4127 for the library and additionally C4306 for the test
servers to get a clean CURL_WERROR build as that warning is raised in
some macros in older Visual Studio versions.

Ref: https://github.com/curl/curl/pull/1667#issuecomment-314082794
Closes https://github.com/curl/curl/pull/1711

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