kconfig: Add variables for integer constants

Add a Kconfig.constants file that defines variables for different known
integer minimum and maximum values.

Signed-off-by: Pieter De Gendt <pieter.degendt@basalte.be>

Kconfig.constants

@@ -0,0 +1,19 @@
+# Constant variables to be used across Kconfig options
+
+# Copyright (c) 2024 basalte bv
+# SPDX-License-Identifier: Apache-2.0
+
+INT8_MIN := -128
+INT16_MIN := -32768
+INT32_MIN := -2147483648
+INT64_MIN := -9223372036854775808
+
+INT8_MAX := 127
+INT16_MAX := 32767
+INT32_MAX := 2147483647
+INT64_MAX := 9223372036854775807
+
+UINT8_MAX := 255
+UINT16_MAX := 65535
+UINT32_MAX := 4294967295
+UINT64_MAX := 18446744073709551615

Kconfig.zephyr

@@ -5,6 +5,8 @@
 # Copyright (c) 2023 Nordic Semiconductor ASA
 # SPDX-License-Identifier: Apache-2.0
 
+source "Kconfig.constants"
+
 osource "${APPLICATION_SOURCE_DIR}/VERSION"
 
 # Include Kconfig.defconfig files first so that they can override defaults and