CMake app: add our cmake folder to CMAKE_MODULE_PATH

All files within tools/cmake can now include within tools/cmake. We do not expose
internal folders like core/profiles/toolchains.
They should be included via toolchain file (mbed_toolchain in our case).

Author: 0xc0170

tools/cmake/app.cmake

@@ -1,6 +1,9 @@
 # Copyright (c) 2020 ARM Limited. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 
+# Add our CMake list files to CMake default module path
+set(CMAKE_MODULE_PATH "${CMAKE_MODULE_PATH};${CMAKE_CURRENT_LIST_DIR}")
+
 find_program(CCACHE "ccache")
 if(CCACHE)
     set(CMAKE_C_COMPILER_LAUNCHER ${CCACHE})
@@ -12,11 +15,11 @@ include(${MBED_CONFIG_PATH}/mbed_config.cmake)
 # Load toolchain file
 if(NOT CMAKE_TOOLCHAIN_FILE OR MBED_TOOLCHAIN_FILE_USED)
     set(MBED_TOOLCHAIN_FILE_USED TRUE CACHE INTERNAL "")
-    include(${mbed-os_SOURCE_DIR}/tools/cmake/toolchain.cmake)
+    include(toolchain)
 endif()
 
 # Specify available build profiles and add options for the selected build profile
-include(${mbed-os_SOURCE_DIR}/tools/cmake/profile.cmake)
+include(profile)
 
 enable_language(C CXX ASM)
 
@@ -26,7 +29,7 @@ set(CMAKE_EXECUTABLE_SUFFIX .elf)
 
 # Find Python
 find_package(Python3 COMPONENTS Interpreter)
-include(${CMAKE_CURRENT_LIST_DIR}/CheckPythonPackage.cmake)
+include(CheckPythonPackage)
 
 # Check python packages from requirements.txt
 file(STRINGS ${CMAKE_CURRENT_LIST_DIR}/requirements.txt PYTHON_REQUIREMENTS)

tools/cmake/profile.cmake

@@ -29,4 +29,4 @@ else()
     endif()
 endif()
 
-include(${CMAKE_CURRENT_LIST_DIR}/profiles/${LOWERCASE_CMAKE_BUILD_TYPE}.cmake)
+include(profiles/${LOWERCASE_CMAKE_BUILD_TYPE})

tools/cmake/toolchain.cmake

@@ -100,8 +100,9 @@ set(link_options "")
 set(common_options "")
 set(c_cxx_compile_options "") # compile options only for C/CXX
 set(asm_compile_options "") # compile options only for ASM
-include(${CMAKE_CURRENT_LIST_DIR}/toolchains/${MBED_TOOLCHAIN}.cmake)
-include(${CMAKE_CURRENT_LIST_DIR}/cores/${MBED_CPU_CORE}.cmake)
+
+include(toolchains/${MBED_TOOLCHAIN})
+include(cores/${MBED_CPU_CORE})
 
 #converts a list into a string with each of its elements seperated by a space
 macro(list_to_space_separated OUTPUT_VAR)# 2nd arg: LIST...