cpu/avr8_common: model Kconfig

cpu/avr8_common/Kconfig

@@ -11,6 +11,10 @@ config CPU_ARCH_AVR8
     select HAS_ARCH_8BIT
     select HAS_ARCH_AVR8
 
+    select MODULE_MALLOC_THREAD_SAFE if TEST_KCONFIG
+    # static C++ constructors need guards for thread safe initialization
+    select MODULE_CXX_CTOR_GUARDS if MODULE_CPP
+
 ## Common CPU symbols
 config CPU_ARCH
     default "avr8" if CPU_ARCH_AVR8
@@ -23,3 +27,21 @@ config HAS_ARCH_AVR8
     bool
     help
         Indicates that the current architecture is Atmel AVR8.
+
+if CPU_ARCH_AVR8
+
+config MODULE_AVR8_COMMON
+    bool
+    depends on TEST_KCONFIG
+    default y
+    help
+        AVR-8 common code.
+
+# the atmel port uses stdio_uart by default
+choice STDIO_IMPLEMENTATION
+    default MODULE_STDIO_UART
+endchoice
+
+endif # CPU_ARCH_AVR8
+
+rsource "avr_libc_extra/Kconfig"

cpu/avr8_common/avr_libc_extra/Kconfig

@@ -0,0 +1,14 @@
+# Copyright (c) 2021 HAW Hamburg
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+#
+
+config MODULE_AVR_LIBC_EXTRA
+    bool
+    depends on TEST_KCONFIG
+    depends on CPU_ARCH_AVR8
+    default y
+    help
+        AVR libc RIOT-specific support code.