Cache.cmake

# https://github.com/cpp-best-practices/project_options/blob/main/src/Cache.cmake
set(CACHE_OPTION
    "ccache"
    CACHE STRING "Compiler cache to be used")
set(CACHE_OPTION_VALUES "ccache" "sccache")
set_property(CACHE CACHE_OPTION PROPERTY STRINGS ${CACHE_OPTION_VALUES})
list(
    FIND
    CACHE_OPTION_VALUES
    ${CACHE_OPTION}
    CACHE_OPTION_INDEX)

if(${CACHE_OPTION_INDEX} EQUAL -1)
    message(
        STATUS
        "Using custom compiler cache system: '${CACHE_OPTION}', explicitly supported entries are ${CACHE_OPTION_VALUES}"
    )
endif()

find_program(CACHE_BINARY NAMES ${CACHE_OPTION_VALUES})
if(CACHE_BINARY)
    message(STATUS "${CACHE_BINARY} found and enabled")
    set(CMAKE_CXX_COMPILER_LAUNCHER
        ${CACHE_BINARY}
        CACHE FILEPATH "CXX compiler cache used")
    set(CMAKE_C_COMPILER_LAUNCHER
        ${CACHE_BINARY}
        CACHE FILEPATH "C compiler cache used")
    else()
endif()