Fresh out of the box errors with pico_sdk_init.cmake

Start with external/pico_sdk_import.cmake at the reported get_filename_component call and compare it with the project's CMakeLists.txt, including the PICO_SDK_PATH and cmake_minimum_required settings. Reproduce the Windows configuration using the shown NMake Makefiles command and verify that CMake configures the blink_example_c project without the reported error.

EDIT: This is for a windows 10 build using G++ (without MinGW-w64).
If I can't get G++ to work (without MinGW-w64) then I use MSVC.

Fresh out of the box errors...

I installed VSCode a few days ago.
After having to add the following line ...

# set cmake dir
set (PICO_SDK_PATH "/picosdk/sdk")

... to my CMakeLists.txt

... and ...

#cmake version
cmake_minimum_required(VERSION 4.12 VERSION 3.31.6-msvc6)

... to my CMakeLists.txt.

These are the next errors:

[main] Configuring project: blink_example_c
[proc] Executing command: "C:\Program Files\Microsoft Visual Studio\2022\Community\Common7\IDE\CommonExtensions\Microsoft\CMake\CMake\bin\cmake.exe" -DCMAKE_BUILD_TYPE:STRING=Debug -DCMAKE_EXPORT_COMPILE_COMMANDS:BOOL=TRUE --no-warn-unused-cli -S "C:/Learning Projects/MS Code/blink_example_c" -B "c:/Learning Projects/MS Code/blink_example_c/build" -G "NMake Makefiles"
[cmake] Not searching for unused variables given on the command line.
[cmake] CMake Error at C:/picosdk/sdk/external/pico_sdk_import.cmake:109 (get_filename_component):
[cmake] get_filename_component unknown component BASE_DIR
[cmake] Call Stack (most recent call first):
[cmake] CMakeLists.txt:8 (include)
[cmake]
[cmake]
[cmake] -- Configuring incomplete, errors occurred!
[proc] The command: "C:\Program Files\Microsoft Visual Studio\2022\Community\Common7\IDE\CommonExtensions\Microsoft\CMake\CMake\bin\cmake.exe" -DCMAKE_BUILD_TYPE:STRING=Debug -DCMAKE_EXPORT_COMPILE_COMMANDS:BOOL=TRUE --no-warn-unused-cli -S "C:/Learning Projects/MS Code/blink_example_c" -B "c:/Learning Projects/MS Code/blink_example_c/build" -G "NMake Makefiles" exited with code: 1

MSVCode points to a error in line 9:
`add_library(_pico_sdk_pre_init_marker INTERFACE)

I haven't changed anything to pico_sdk_init.cmake
Below is a copy of the file.

# Pre-initialize the Raspberry Pi Pico SDK, setting up the platform and toolchain and some CMake utility functions
# This file must be included prior to the project() call

# Note: this file is perhaps named badly, as it provides a method pico_sdk_init which
# the enclosing project calls LATER to actually "initialize" the SDK (by including the CMakeLists.txt from this
# same directory)

if (NOT TARGET _pico_sdk_pre_init_marker)
    add_library(_pico_sdk_pre_init_marker INTERFACE)  # Exception has occurred <<<----------

    function(pico_is_top_level_project VAR)
        string(TOLOWER ${CMAKE_CURRENT_LIST_DIR} __list_dir)
        string(TOLOWER ${CMAKE_SOURCE_DIR} __source_dir)
        if (__source_dir STREQUAL __list_dir)
            set(${VAR} 1 PARENT_SCOPE)
        else()
            set(${VAR} 0 PARENT_SCOPE)
        endif()
    endfunction()

    function(pico_message_debug MESSAGE)
        # The log-level system was added in CMake 3.15.
        if(${CMAKE_VERSION} VERSION_LESS "3.15.0")
            message(${MESSAGE})
        else()
            message(DEBUG ${MESSAGE})
        endif()
    endfunction()

    if (NOT PICO_SDK_PATH)
        set(PICO_SDK_PATH ${CMAKE_CURRENT_LIST_DIR})
    endif ()

    get_filename_component(PICO_SDK_PATH "${PICO_SDK_PATH}" REALPATH BASE_DIR "${CMAKE_BINARY_DIR}")

    set(PICO_SDK_PATH ${CMAKE_CURRENT_LIST_DIR} CACHE PATH "Path to the Raspberry Pi Pico SDK" FORCE)

    list(APPEND CMAKE_MODULE_PATH ${PICO_SDK_PATH}/cmake)

    include(${CMAKE_CURRENT_LIST_DIR}/pico_sdk_version.cmake)
    include(pico_utils)

    message("PICO_SDK_PATH is ${CMAKE_CURRENT_LIST_DIR}")
    macro(pico_sdk_init)
        if (NOT CMAKE_PROJECT_NAME)
            message(WARNING "pico_sdk_init() should be called after the project is created (and languages added)")
        endif()
        add_subdirectory(${PICO_SDK_PATH} pico-sdk)
    endmacro()

    macro(add_sub_list_dirs var)
        foreach(LIST_DIR IN LISTS ${var})
            get_filename_component(SHORT_NAME "${LIST_DIR}" NAME)
            pico_message_debug("Including custom CMakeLists.txt ${SHORT_NAME}")
            add_subdirectory(${LIST_DIR} ${SHORT_NAME})
        endforeach()
    endmacro()

    macro(add_sub_list_files var)
        foreach(LIST_FILE IN LISTS ${var})
            pico_message_debug("Including custom CMake file ${LIST_FILE}")
            include(${LIST_FILE})
        endforeach()
    endmacro()

    macro(pico_register_common_scope_var NAME)
        if (NOT ${NAME} IN_LIST PICO_PROMOTE_COMMON_SCOPE_VARS)
            list(APPEND PICO_PROMOTE_COMMON_SCOPE_VARS ${NAME})
        endif()
    endmacro()

    set(PICO_PROMOTE_COMMON_SCOPE_VARS
            PICO_INCLUDE_DIRS
            PICO_SDK_POST_LIST_DIRS
            PICO_SDK_POST_LIST_FILES
            PICO_CONFIG_HEADER_FILES
            PICO_RP2040_CONFIG_HEADER_FILES
            PICO_BOARD_CMAKE_OVERRIDES
    )

    macro(pico_promote_common_scope_vars)
        set(PICO_PROMOTE_COMMON_SCOPE_VARS ${PICO_PROMOTE_COMMON_SCOPE_VARS} PARENT_SCOPE)
        foreach(VAR IN LISTS PICO_PROMOTE_COMMON_SCOPE_VARS)
            SET(${VAR} ${${VAR}} PARENT_SCOPE)
        endforeach()
    endmacro()

    include(pico_pre_load_platform)

    # We want to configure correct toolchain prior to project load
    # todo perhaps this should be included by the platform instead?
    include(pico_pre_load_toolchain)
endif()