build: add option to delete intermediate files

Add option to remove intermediate files to save space and remove
clutter.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

CMakeLists.txt

@@ -1153,6 +1153,17 @@ if(CONFIG_BUILD_OUTPUT_BIN)
   endif()
 endif()
 
+
+# Cleanup intermediate files
+if(CONFIG_CLEANUP_INTERMEDIATE_FILES)
+    list(APPEND
+      post_build_commands
+      COMMAND
+      # This file can be very large in some cases, delete it as we do not need it.
+      ${CMAKE_COMMAND} -E remove ${ZEPHYR_PREBUILT_EXECUTABLE}.elf
+      )
+endif()
+
 if(CONFIG_BUILD_OUTPUT_S19)
   get_property(elfconvert_formats TARGET bintools PROPERTY elfconvert_formats)
   if(srec IN_LIST elfconvert_formats)

Kconfig.zephyr

@@ -295,6 +295,12 @@ config OUTPUT_PRINT_MEMORY_USAGE
 	  ram_report and
 	  https://sourceware.org/binutils/docs/ld/MEMORY.html
 
+config CLEANUP_INTERMEDIATE_FILES
+	bool "Remove all intermediate files"
+	help
+	  Delete intermediate files to save space and cleanup clutter resulting
+	  from the build process.
+
 config BUILD_NO_GAP_FILL
 	bool "Don't fill gaps in generated hex/bin/s19 files."