project(qemu)

# Avoid Warning About DOWNLOAD_EXTRACT_TIMESTAMP
if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.24.0)
    cmake_policy(SET CMP0135 NEW)
endif()

# Archive
set(RUNTIME_QEMU_ARCHIVE "" CACHE FILEPATH "QEMU Path")
if(NOT EXISTS "${RUNTIME_QEMU_ARCHIVE}")
    message(FATAL_ERROR "Missing QEMU Archive!")
endif()

# Library
set(QEMU_LIBRARY "/lib/libqemu-arm.so")

# Build
include(ExternalProject)
set(PKGCONFIG_ENV "")
if(DEFINED ENV{PKG_CONFIG_LIBDIR})
    set(PKGCONFIG_ENV "PKG_CONFIG_LIBDIR=$ENV{PKG_CONFIG_LIBDIR}")
endif()
ExternalProject_Add(qemu
    URL "${RUNTIME_QEMU_ARCHIVE}"
    # Configure Build
    CONFIGURE_COMMAND
        "${CMAKE_COMMAND}" "-E" "env"
        ${PKGCONFIG_ENV}
        "<SOURCE_DIR>/configure"
        "--prefix=<INSTALL_DIR>"
        "--cross-prefix="
        "--cc=${CMAKE_C_COMPILER}"
        "--cxx=${CMAKE_CXX_COMPILER}"
        "--disable-debug-info"
        "--enable-strip"
        "--enable-pie"
        "-Db_staticpic=true"
        "-Db_lundef=false"
        "--target-list=arm-linux-user"
        "--without-default-features"
    USES_TERMINAL_CONFIGURE TRUE
    # Build Command
    BUILD_COMMAND "ninja"
    COMMAND "ninja" "install"
    BUILD_BYPRODUCTS "<INSTALL_DIR>${QEMU_LIBRARY}"
    USES_TERMINAL_BUILD TRUE
    # Patch Command
    PATCH_COMMAND "patch" "-p1" "<" "${CMAKE_CURRENT_SOURCE_DIR}/runtime.patch"
    # Disable Install Command
    INSTALL_COMMAND ""
)

# Get Full Library Path
ExternalProject_Get_Property(qemu INSTALL_DIR)
string(PREPEND QEMU_LIBRARY "${INSTALL_DIR}")

# Link
target_link_libraries(runtime "${QEMU_LIBRARY}")
target_compile_definitions(trampoline-headers INTERFACE MCPI_HAS_QEMU)

# Install
if(DEFINED MCPI_LIB_DIR)
    install(PROGRAMS "${QEMU_LIBRARY}" DESTINATION "${MCPI_LIB_DIR}")
    # License
    ExternalProject_Get_Property(qemu SOURCE_DIR)
    install(FILES "${SOURCE_DIR}/COPYING" DESTINATION "${MCPI_LEGAL_DIR}/qemu")
endif()