cmake: expand build components before generating config

!4452 had config generation first before building the component list
to be used in the build. This proved to be detrimental when a new target
is added as config generation would consider configs from both targets.

tools/cmake/build.cmake

@@ -365,12 +365,6 @@ macro(idf_build_process target)
     # Check for required Python modules
     __build_check_python()
 
-    # Generate config values in different formats
-    idf_build_get_property(sdkconfig SDKCONFIG)
-    idf_build_get_property(sdkconfig_defaults SDKCONFIG_DEFAULTS)
-    __kconfig_generate_config("${sdkconfig}" "${sdkconfig_defaults}")
-    __build_import_configs()
-
     # Write the partial build properties to a temporary file.
     # The path to this generated file is set to a short-lived build
     # property BUILD_PROPERTIES_FILE.
@@ -416,6 +410,7 @@ macro(idf_build_process target)
     idf_build_unset_property(BUILD_PROPERTIES_FILE)
     file(REMOVE ${build_properties_file})
 
+
     # Finally, do component expansion. In this case it simply means getting a final list
     # of build component targets given the requirements set by each component.
     if(__COMPONENTS)
@@ -442,6 +437,12 @@ macro(idf_build_process target)
         idf_build_set_property(___COMPONENT_REQUIRES_COMMON ${lib} APPEND)
     endforeach()
 
+    # Generate config values in different formats
+    idf_build_get_property(sdkconfig SDKCONFIG)
+    idf_build_get_property(sdkconfig_defaults SDKCONFIG_DEFAULTS)
+    __kconfig_generate_config("${sdkconfig}" "${sdkconfig_defaults}")
+    __build_import_configs()
+
     # Temporary trick to support both gcc5 and gcc8 builds
     if(CMAKE_C_COMPILER_VERSION VERSION_EQUAL 5.2.0)
         set(GCC_NOT_5_2_0 0 CACHE STRING "GCC is 5.2.0 version")

tools/cmake/kconfig.cmake

@@ -88,14 +88,17 @@ endfunction()
 function(__kconfig_generate_config sdkconfig sdkconfig_defaults)
     # List all Kconfig and Kconfig.projbuild in known components
     idf_build_get_property(component_targets __COMPONENT_TARGETS)
+    idf_build_get_property(build_component_targets __BUILD_COMPONENT_TARGETS)
     foreach(component_target ${component_targets})
-        __component_get_property(kconfig ${component_target} KCONFIG)
-        __component_get_property(kconfig_projbuild ${component_target} KCONFIG_PROJBUILD)
-        if(kconfig)
-            list(APPEND kconfigs ${kconfig})
-        endif()
-        if(kconfig_projbuild)
-            list(APPEND kconfig_projbuilds ${kconfig_projbuild})
+        if(component_target IN_LIST build_component_targets)
+            __component_get_property(kconfig ${component_target} KCONFIG)
+            __component_get_property(kconfig_projbuild ${component_target} KCONFIG_PROJBUILD)
+            if(kconfig)
+                list(APPEND kconfigs ${kconfig})
+            endif()
+            if(kconfig_projbuild)
+                list(APPEND kconfig_projbuilds ${kconfig_projbuild})
+            endif()
         endif()
     endforeach()