Generate files with detecting changed files in CMake

generate-expectation-files.sh

#!/bin/bash

set -eu
: $1 $2

INPUT_FILE_PATH=$1
OUTPUT_FILE_PATH=$2

printf "std::string(R\"(%s\n)\")" "$(cat "$INPUT_FILE_PATH")" > "$OUTPUT_FILE_PATH"

GenerateFiles.cmake

file(GLOB_RECURSE ExpectationInputFiles CONFIGURE_DEPENDS "*.stdout" "*.stderr")
foreach(InputFilePath ${ExpectationInputFiles})
    get_filename_component(FileBaseDir ${InputFilePath} DIRECTORY)
    get_filename_component(FileName ${InputFilePath} NAME)
    set(OutputFilePath "${FileBaseDir}/gen/${FileName}.gen")

    add_custom_command(
        OUTPUT ${OutputFilePath}
        COMMAND bash ${CMAKE_CURRENT_SOURCE_DIR}/generate-expectation-files.sh ${InputFilePath} ${OutputFilePath}
        DEPENDS ${InputFilePath}
    )
    list(APPEND ExpectationOutputFiles ${OutputFilePath})
endforeach()

add_custom_target(GenerateExpectationFiles ALL DEPENDS ${ExpectationOutputFiles})
add_dependencies(poac GenerateExpectationFiles)