build_time_checks.cmake

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# Copyright (C) 2025 The Qt Company Ltd.

# SPDX-License-Identifier: BSD-3-Clause

include_guard()

# Check whether ${file_path} is generated during the build phase.

# We do this by creating a custom command that creates a copy of the file.

# If the file_path is not known to the build system, ninja will complain.

# If the file_path is known to the build system but not created, the copy command fails.

function(check_file_is_built file_path)

    set(out_file "${file_path}.copy")

    add_custom_command(

        OUTPUT "${out_file}"

        DEPENDS "${file_path}"

        COMMAND "${CMAKE_COMMAND}" -E copy "${file_path}" "${out_file}"

        VERBATIM

    get_filename_component(target "${file_path}" NAME)

    string(REGEX REPLACE "[ .-]" "_" target "${target}")

    string(PREPEND target "copy_")

    while(TARGET "${target}")

        string(APPEND target "_")

    endwhile()

    add_custom_target("${target}" ALL

        DEPENDS "${out_file}"

endfunction()