cmake: zephyr module processing improvements.

This commit improves Zephyr modules support in CMake.
All Zephyr modules will now have a corresponding
`ZEPHYR_${module_name}_MODULE_DIR` set, regardless of whether they
define a cmake folder in module.yml.

This results in:
`ZEPHYR_${module_name}_MODULE_DIR` defined for all modules and refers to
the root of the modle.
`ZEPHYR_${module_name}_CMAKE_DIR` defined for modules that specifies
cmake in module.yml, or is having both a CMakeLists.txt and Kconfig file
in the zephyr folder.

Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>

CMakeLists.txt

@@ -470,11 +470,15 @@ foreach(module_name ${ZEPHYR_MODULE_NAMES})
   # the main binary dir instead.
   # https://cmake.org/pipermail/cmake/2019-June/069547.html
   string(TOUPPER ${module_name} MODULE_NAME_UPPER)
-  set(ZEPHYR_CURRENT_MODULE_DIR ${ZEPHYR_${MODULE_NAME_UPPER}_MODULE_DIR})
-  add_subdirectory(${ZEPHYR_CURRENT_MODULE_DIR} ${CMAKE_BINARY_DIR}/modules/${module_name})
+  if(NOT ${ZEPHYR_${MODULE_NAME_UPPER}_CMAKE_DIR} STREQUAL "")
+    set(ZEPHYR_CURRENT_MODULE_DIR ${ZEPHYR_${MODULE_NAME_UPPER}_MODULE_DIR})
+    set(ZEPHYR_CURRENT_CMAKE_DIR ${ZEPHYR_${MODULE_NAME_UPPER}_CMAKE_DIR})
+    add_subdirectory(${ZEPHYR_CURRENT_CMAKE_DIR} ${CMAKE_BINARY_DIR}/modules/${module_name})
+  endif()
 endforeach()
-# Done processing modules, clear ZEPHYR_CURRENT_MODULE_DIR.
+# Done processing modules, clear ZEPHYR_CURRENT_MODULE_DIR and ZEPHYR_CURRENT_CMAKE_DIR.
 set(ZEPHYR_CURRENT_MODULE_DIR)
+set(ZEPHYR_CURRENT_CMAKE_DIR)
 
 set(syscall_list_h   ${CMAKE_CURRENT_BINARY_DIR}/include/generated/syscall_list.h)
 set(syscalls_json    ${CMAKE_CURRENT_BINARY_DIR}/misc/generated/syscalls.json)

cmake/zephyr_module.cmake

@@ -69,13 +69,15 @@ if(WEST OR ZEPHYR_MODULES)
       # Match "<name>":"<path>" for each line of file, each corresponding to
       # one module. The use of quotes is required due to CMake not supporting
       # lazy regexes (it supports greedy only).
-      string(REGEX REPLACE "\"(.*)\":\".*\"" "\\1" module_name ${module})
-      string(REGEX REPLACE "\".*\":\"(.*)\"" "\\1" module_path ${module})
+      string(REGEX REPLACE "\"(.*)\":\".*\":\".*\"" "\\1" module_name ${module})
+      string(REGEX REPLACE "\".*\":\"(.*)\":\".*\"" "\\1" module_path ${module})
+      string(REGEX REPLACE "\".*\":\".*\":\"(.*)\"" "\\1" cmake_path ${module})
 
       list(APPEND ZEPHYR_MODULE_NAMES ${module_name})
 
       string(TOUPPER ${module_name} MODULE_NAME_UPPER)
       set(ZEPHYR_${MODULE_NAME_UPPER}_MODULE_DIR ${module_path})
+      set(ZEPHYR_${MODULE_NAME_UPPER}_CMAKE_DIR ${cmake_path})
     endforeach()
   endif()
 else()

scripts/zephyr_module.py

@@ -135,12 +135,14 @@ def process_cmake(module, meta):
     cmake_path = os.path.join(module, cmake_setting or 'zephyr')
     cmake_file = os.path.join(cmake_path, 'CMakeLists.txt')
     if os.path.isfile(cmake_file):
-        return('\"{}\":\"{}\"\n'
+        return('\"{}\":\"{}\":\"{}\"\n'
                .format(module_path.name,
+                       module_path.as_posix(),
                        Path(cmake_path).resolve().as_posix()))
     else:
-        return ""
-
+        return('\"{}\":\"{}\":\"\"\n'
+               .format(module_path.name,
+                       module_path.as_posix()))
 
 def process_settings(module, meta):
     section = meta.get('build', dict())
@@ -175,7 +177,6 @@ def process_kconfig(module, meta):
     else:
         return ""
 
-
 def process_sanitycheck(module, meta):
 
     out = ""