Adding support for 0.18 zephyr sdk

* Changes have been partly taken from here:
zephyrproject-rtos/zephyr@15c3776#diff-529decabf18d860968a987c34f75a7102c007194f1ee3a845fd6016b9b7538f7
* This is needed because of change to the folder structure:

Old: opt/zephyr-sdk/arm-zephyr-eabi
New: opt/zephyr-sdk/gnu/arm-zephyr-eabi
     opt/zephyr-sdk/llvm/arm-zephyr-eabi

This structure has been adapet from the zephyr toolchain install script.

Signed-off-by: Sebastian Wezel <[email protected]>

Author: DatGizmo

cmake/modules/FindHostTools.cmake

@@ -96,7 +96,7 @@ zephyr_file(APPLICATION_ROOT TOOLCHAIN_ROOT)
 
 # Host-tools don't unconditionally set TOOLCHAIN_HOME anymore,
 # but in case Zephyr's SDK toolchain is used, set TOOLCHAIN_HOME
-if("${ZEPHYR_TOOLCHAIN_VARIANT}" STREQUAL "zephyr")
+if("${ZEPHYR_TOOLCHAIN_VARIANT}" STREQUAL "zephyr-gnu")
   set(TOOLCHAIN_HOME ${HOST_TOOLS_HOME})
 endif()
 

cmake/modules/FindZephyr-sdk.cmake

@@ -54,7 +54,7 @@ endif()
 # 1) Zephyr specified as toolchain (ZEPHYR_SDK_INSTALL_DIR still used if defined)
 # 2) No toolchain specified == Default to Zephyr toolchain
 # Until we completely deprecate it
-if(("zephyr" STREQUAL ${ZEPHYR_TOOLCHAIN_VARIANT}) OR
+if(("zephyr-gnu" STREQUAL ${ZEPHYR_TOOLCHAIN_VARIANT}) OR
    (NOT DEFINED ZEPHYR_TOOLCHAIN_VARIANT) OR
    (DEFINED ZEPHYR_SDK_INSTALL_DIR) OR
    (Zephyr-sdk_FIND_REQUIRED))

cmake/toolchain/zephyr/generic.cmake renamed to cmake/toolchain/zephyr-gnu/generic.cmake

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: Apache-2.0
 
-include(${ZEPHYR_SDK_INSTALL_DIR}/cmake/zephyr/generic.cmake)
+include(${ZEPHYR_SDK_INSTALL_DIR}/cmake/zephyr/gnu/generic.cmake)
 
 set(TOOLCHAIN_KCONFIG_DIR ${ZEPHYR_SDK_INSTALL_DIR}/cmake/zephyr)
 

cmake/toolchain/zephyr-gnu/target.cmake

@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: Apache-2.0
+
+include(${ZEPHYR_SDK_INSTALL_DIR}/cmake/zephyr/gnu/target.cmake)

cmake/toolchain/zephyr-llvm/generic.cmake

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: Apache-2.0
+
+include(${ZEPHYR_SDK_INSTALL_DIR}/cmake/zephyr/llvm/generic.cmake)
+
+set(TOOLCHAIN_KCONFIG_DIR ${ZEPHYR_SDK_INSTALL_DIR}/cmake/zephyr)
+
+message(STATUS "Found toolchain: zephyr ${SDK_VERSION} (${ZEPHYR_SDK_INSTALL_DIR})")

cmake/toolchain/zephyr-llvm/target.cmake

@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: Apache-2.0
+
+include(${ZEPHYR_SDK_INSTALL_DIR}/cmake/zephyr/llvm/target.cmake)