cmake: propagating zephyr base to west

West utilizes Zephyr base when invoked out-of-tree in order to determine
west topdir.

This commit ensures that zephyr base when invoking west from CMake is
set to current zephyr base.

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

cmake/host-tools.cmake

@@ -38,11 +38,12 @@ else()
   # even after output is one line.
   message(STATUS "Found west: ${WEST} (found suitable version \"${west_version}\", minimum required is \"${MIN_WEST_VERSION}\")")
 
-  execute_process(
-    COMMAND ${WEST}  topdir
-    OUTPUT_VARIABLE  WEST_TOPDIR
-    OUTPUT_STRIP_TRAILING_WHITESPACE
-    )
+    execute_process(
+      COMMAND ${WEST}  topdir
+      OUTPUT_VARIABLE  WEST_TOPDIR
+      OUTPUT_STRIP_TRAILING_WHITESPACE
+      WORKING_DIRECTORY ${ZEPHYR_BASE}
+      )
 endif()
 
 # dtc is an optional dependency. Search for it on PATH and in

cmake/zephyr_module.cmake

@@ -21,7 +21,7 @@ endif()
 set(KCONFIG_MODULES_FILE ${CMAKE_BINARY_DIR}/Kconfig.modules)
 
 if(WEST)
-  set(WEST_ARG "--west-path" ${WEST})
+  set(WEST_ARG "--west-path" ${WEST} "--zephyr-base" ${ZEPHYR_BASE})
 endif()
 
 if(WEST OR ZEPHYR_MODULES)

scripts/zephyr_module.py

@@ -178,10 +178,13 @@ def main():
                         help='List of extra modules to parse')
     parser.add_argument('-w', '--west-path', default='west',
                         help='Path to west executable')
+    parser.add_argument('-z', '--zephyr-base',
+                        help='Path to zephyr repository')
     args = parser.parse_args()
 
     if args.modules is None:
         p = subprocess.Popen([args.west_path, 'list', '--format={posixpath}'],
+                             cwd=args.zephyr_base,
                              stdout=subprocess.PIPE,
                              stderr=subprocess.PIPE)
         out, err = p.communicate()