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cmake_minimum_required(VERSION 2.8.8)

project(interface_class_printer)

option(BUILD_INTERFACE_CLASS_PRINTER "Build the tool that converts a C++ interface class into a C struct." ON)
mark_as_advanced(BUILD_INTERFACE_CLASS_PRINTER)
if (BUILD_INTERFACE_CLASS_PRINTER)

    # Find boost
    find_package(Boost COMPONENTS date_time REQUIRED)
    include_directories(${Boost_INCLUDE_DIRS})

    # Find LLVM Config binary for LLVM 3.5
    # If you're on debian, go to http://llvm.org/apt/ and install the development
    # release of LLVM (all packages).
    find_program(LLVM_CONFIG_PATH "llvm-config-3.5")    
    if(NOT LLVM_CONFIG_PATH)
        message(FATAL_ERROR "llvm-config-3.5 not found -- ${LLVM_CONFIG_PATH}")
    endif()    
    message(STATUS "Found LLVM_CONFIG_PATH as ${LLVM_CONFIG_PATH}")

    # This function saves the output of the llvm-config command with the given
    # switch to the variable named VARNAME.
    #
    # Example usage: llvm_config(LLVM_CXXFLAGS "--cxxflags")
    function(llvm_config VARNAME switch)
        set(CONFIG_COMMAND "${LLVM_CONFIG_PATH}" "${switch}")
        
        execute_process(
            COMMAND ${CONFIG_COMMAND}
            RESULT_VARIABLE HAD_ERROR
            OUTPUT_VARIABLE CONFIG_OUTPUT
        )
        
        if (HAD_ERROR)
            string(REPLACE ";" " " CONFIG_COMMAND_STR "${CONFIG_COMMAND}")
            message(STATUS "${CONFIG_COMMAND_STR}")
            message(FATAL_ERROR "llvm-config failed with status ${HAD_ERROR}")
        endif()
        
        # replace linebreaks with semicolon
        string(REGEX REPLACE
            "[ \t]*[\r\n]+[ \t]*" ";"
            CONFIG_OUTPUT ${CONFIG_OUTPUT})
        
        # make result available outside
        set(${VARNAME} ${CONFIG_OUTPUT} PARENT_SCOPE)
        
        # Optionally output the configured value
        message(STATUS "llvm_config(${VARNAME})=>${CONFIG_OUTPUT}")
        
        # cleanup
        unset(CONFIG_COMMAND)
    endfunction(llvm_config)
    
    llvm_config(LLVM_CXXFLAGS "--cxxflags")
    llvm_config(LLVM_LDFLAGS "--ldflags")
    llvm_config(LLVM_LIBS "--libs")
    llvm_config(LLVM_LIBDIR "--libdir")
    llvm_config(LLVM_INCLUDE_DIR "--includedir")
    llvm_config(LLVM_SYSTEM_LIBS "--system-libs")

    add_definitions(${LLVM_CXXFLAGS})
    add_definitions(-fno-rtti)
    include_directories(${LLVM_INCLUDE_DIR})
    link_directories(${LLVM_LIBDIR})

    add_executable(interface-class-printer
        InterfaceClassPrinter.h
        InterfaceClassPrinter.cpp
        InterfaceClassPrinterMain.cpp
        )

    # Libraries migh only be found when building with:
    # LD_LIBRARY_PATH=$(llvm-config-3.5 --libdir):$LD_LIBRARY_PATH make
    target_link_libraries(interface-class-printer
        ${LLVM_LDFLAGS}
        -lLLVM-3.5
        -lclangTooling
        -lclangFrontendTool
        -lclangFrontend
        -lclangDriver
        -lclangSerialization
        -lclangParse
        -lclangSema
        -lclangAnalysis
        -lclangEdit
        -lclangAST
        -lclangLex
        -lclangBasic
        -lclangASTMatchers
        ${LLVM_LIBS}
        ${Boost_LIBRARIES}
    )
endif()