By passing to clang-tidy the C compiler with `--target` and sysroot
options, if any.
Fixing (GHA/windows, linux-mingw, CM clang-tidy):
```
lib/curl_setup.h:841:10: error: 'io.h' file not found [clang-diagnostic-error]
841 | #include <io.h>
| ^~~~~~
Found compiler error(s).
FAILED: [code=1] tests/server/CMakeFiles/servers-clang-tidy bld/tests/server/CMakeFiles/servers-clang-tidy
cd tests/server && /usr/bin/clang-tidy --config-file=.clang-tidy.yml
--warnings-as-errors=* --checks=-clang-diagnostic-unused-function first.c getpart.c util.c dnsd.c [...]
-- <-D-options> <-I-options> <cflags>
```
For reference, this is CMake's built-in clang-tidy invocation:
```
/usr/local/bin/cmake -E __run_co_compile --tidy="/usr/bin/clang-tidy;--config-file=.clang-tidy.yml;
--warnings-as-errors=*;--extra-arg-before=--driver-mode=gcc" --source=lib/curl_fopen.c
-- /usr/bin/clang --target=x86_64-w64-mingw32 <-D-options> <-I-options> <cflags>
```
Also:
- bump cmakelint `--max-statements`. Needs 59 after this patch.
- use undocumented CMake variables:
- `CMAKE_C_COMPILE_OPTIONS_TARGET` for `--target=`
- `CMAKE_C_COMPILE_OPTIONS_SYSROOT` for `--sysroot=`
Cherry-picked from #20631Closes#20640
- GHA/checksrc: make a step name more accurate.
- cmakelint.sh: make sure to run from project root.
To make it easier to run locally.
- cmakelint.sh: use `set -eu`.
Closes#17915
Add CMake test project consuming curl via these methods:
`FetchContent`, `add_subdirectory()`, `find_package()`.
Also:
- GHA/distcheck: run these tests in CI.
- cmakelint: exclude a warning for calling "wonky-cased" built-in
CMake functions, such as `FetchContent_Declare()`.
Closes#16126
A number of checks don't match our style or are buggy and so are disabled.
Co-authored-by: Viktor Szakats <vszakats@users.noreply.github.com>
Fixes#14580Closes#14665
