cmake: check include directories

tools/cmake/component.cmake

@@ -233,10 +233,10 @@ function(__component_get_requirements)
     file(REMOVE ${component_requires_file})
 endfunction()
 
-# __component_add_sources, __component_check_target
+# __component_add_sources, __component_check_target, __component_add_include_dirs
 #
-# Utility macros for component registration. Adds source files and checks target requirements
-# respectively.
+# Utility macros for component registration. Adds source files and checks target requirements,
+# and adds include directories respectively.
 macro(__component_add_sources sources)
     set(sources "")
     if(__SRCS)
@@ -280,6 +280,16 @@ macro(__component_add_sources sources)
     list(REMOVE_DUPLICATES sources)
 endmacro()
 
+macro(__component_add_include_dirs lib dirs type)
+    foreach(dir ${dirs})
+        get_filename_component(_dir ${dir} ABSOLUTE BASE_DIR ${CMAKE_CURRENT_LIST_DIR})
+        if(NOT IS_DIRECTORY ${_dir})
+            message(FATAL_ERROR "Include directory '${_dir}' is not a directory.")
+        endif()
+        target_include_directories(${lib} ${type} ${_dir})
+    endforeach()
+endmacro()
+
 macro(__component_check_target)
     if(__REQUIRED_IDF_TARGETS)
         idf_build_get_property(idf_target IDF_TARGET)
@@ -325,6 +335,7 @@ macro(__component_set_all_dependencies)
     endif()
 endmacro()
 
+
 # idf_component_get_property
 #
 # @brief Retrieve the value of the specified component property
@@ -437,16 +448,16 @@ function(idf_component_register)
     if(sources OR __EMBED_FILES OR __EMBED_TXTFILES)
         add_library(${component_lib} STATIC ${sources})
         __component_set_property(${component_target} COMPONENT_TYPE LIBRARY)
-        target_include_directories(${component_lib} PUBLIC ${__INCLUDE_DIRS})
-        target_include_directories(${component_lib} PRIVATE ${__PRIV_INCLUDE_DIRS})
-        target_include_directories(${component_lib} PUBLIC ${config_dir})
+        __component_add_include_dirs(${component_lib} "${__INCLUDE_DIRS}" PUBLIC)
+        __component_add_include_dirs(${component_lib} "${__PRIV_INCLUDE_DIRS}" PRIVATE)
+        __component_add_include_dirs(${component_lib} "${config_dir}" PUBLIC)
         set_target_properties(${component_lib} PROPERTIES OUTPUT_NAME ${COMPONENT_NAME})
         __ldgen_add_component(${component_lib})
     else()
         add_library(${component_lib} INTERFACE)
         __component_set_property(${component_target} COMPONENT_TYPE CONFIG_ONLY)
-        target_include_directories(${component_lib} INTERFACE ${__INCLUDE_DIRS})
-        target_include_directories(${component_lib} INTERFACE ${config_dir})
+        __component_add_include_dirs(${component_lib} "${__INCLUDE_DIRS}" INTERFACE)
+        __component_add_include_dirs(${component_lib} "${config_dir}" INTERFACE)
     endif()
 
     # Alias the static/interface library created for linking to external targets.