cmake: improve clang-tidy test command-line reproduction

- also query `INTERFACE_COMPILE_DEFINITIONS` and
  `INTERFACE_COMPILE_OPTIONS`.
  To further sync clang-tidy manual command-lines with the C compiler
  command-lines generated by CMake. In practice this adds `-I` options
  (via `INTERFACE_COMPILE_OPTIONS`) to the end of the command-line for
  dependency header directories. It does not change the outcome of
  clang-tidy runs.

- limit querying `COMPILE_DEFINITIONS` and `COMPILE_OPTIONS` to the top
  target, the test itself. To not include options such as
  `-DCURL_HIDDEN_SYMBOLS` and `-fvisibility=hidden` (when set) via
  the libcurl shared lib.
  To sync with the actual C compiler command-line.

- drop redundant `unset()`.

- rename local function to be more specific.

Follow-up to d9386a2f8e #20759

Closes #20829

CMake/Macros.cmake

@@ -110,20 +110,16 @@ endmacro()
 
 # Internal: Recurse into target libraries and collect their include directories
 # and macro definitions.
-macro(curl_collect_target_options _target)
+macro(curl_collect_target_compile_options _target)
-  get_target_property(_val ${_target} COMPILE_DEFINITIONS)
+  get_target_property(_val ${_target} INTERFACE_COMPILE_DEFINITIONS)
   if(_val)
     list(APPEND _definitions ${_val})
   endif()
-  get_target_property(_val ${_target} INCLUDE_DIRECTORIES)
-  if(_val)
-    list(APPEND _includes ${_val})
-  endif()
   get_target_property(_val ${_target} INTERFACE_INCLUDE_DIRECTORIES)
   if(_val)
     list(APPEND _incsys ${_val})
   endif()
-  get_target_property(_val ${_target} COMPILE_OPTIONS)
+  get_target_property(_val ${_target} INTERFACE_COMPILE_OPTIONS)
   if(_val)
     list(APPEND _options ${_val})
   endif()
@@ -131,7 +127,7 @@ macro(curl_collect_target_options _target)
   if(_val)
     foreach(_lib IN LISTS _val)
       if(TARGET "${_lib}")
-        curl_collect_target_options(${_lib})
+        curl_collect_target_compile_options(${_lib})
       endif()
     endforeach()
   endif()
@@ -159,7 +155,7 @@ function(curl_add_clang_tidy_test_target _target_clang_tidy _target)
       endif()
     endforeach()
 
-    # Collect macro definitions and header directories applying to the directory
+    # Collect options applying to the directory
     get_directory_property(_val COMPILE_DEFINITIONS)
     if(_val)
       list(APPEND _definitions ${_val})
@@ -172,10 +168,23 @@ function(curl_add_clang_tidy_test_target _target_clang_tidy _target)
     if(_val)
       list(APPEND _options ${_val})
     endif()
-    unset(_val)
+
+    # Collect options applying to the target
+    get_target_property(_val ${_target} COMPILE_DEFINITIONS)
+    if(_val)
+      list(APPEND _definitions ${_val})
+    endif()
+    get_target_property(_val ${_target} INCLUDE_DIRECTORIES)
+    if(_val)
+      list(APPEND _includes ${_val})
+    endif()
+    get_target_property(_val ${_target} COMPILE_OPTIONS)
+    if(_val)
+      list(APPEND _options ${_val})
+    endif()
 
     # Collect header directories and macro definitions from lib dependencies
-    curl_collect_target_options(${_target})
+    curl_collect_target_compile_options(${_target})
 
     list(REMOVE_ITEM _definitions "")
     string(REPLACE ";" ";-D" _definitions ";${_definitions}")

scripts/cmakelint.sh

@@ -72,8 +72,8 @@ cd "$(dirname "$0")"/..
     --min-statement-spacing 1 \
     --max-statement-spacing 2 \
     --max-returns 6 \
-    --max-branches 15 \
+    --max-branches 20 \
     --max-arguments 5 \
     --max-localvars 15 \
-    --max-statements 85 \
+    --max-statements 95 \
     --