# These flags applies to exiv2lib, the applications, and to the xmp code

if ( MINGW OR UNIX OR MSYS ) # MINGW, Linux, APPLE, CYGWIN
    if (${CMAKE_CXX_COMPILER_ID} STREQUAL GNU)
        set(COMPILER_IS_GCC ON)
    elseif (${CMAKE_CXX_COMPILER_ID} MATCHES "Clang")
        set(COMPILER_IS_CLANG ON)
    endif()

    set (CMAKE_CXX_FLAGS_DEBUG      "-g3 -gstrict-dwarf -O0")

    if (CMAKE_GENERATOR MATCHES "Xcode")
        set(CMAKE_XCODE_ATTRIBUTE_GCC_VERSION "com.apple.compilers.llvm.clang.1_0")
        if (EXIV2_ENABLE_EXTERNAL_XMP)
            # XMP SDK 2016 uses libstdc++ even when it is deprecated in modern versions of the OSX SDK.
            # The only way to make Exiv2 work with the external XMP SDK is to use the same standard library.
            set(CMAKE_XCODE_ATTRIBUTE_CLANG_CXX_LIBRARY "libstdc++")
        else()
            set(CMAKE_XCODE_ATTRIBUTE_CLANG_CXX_LIBRARY "libc++")
        endif()
    endif()

    if (COMPILER_IS_GCC OR COMPILER_IS_CLANG)

        if(BUILD_WITH_COVERAGE)
            set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g ")
            set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O0")
            set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fprofile-arcs")
            set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -ftest-coverage")
            set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} --coverage")
        endif()

        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wcast-align -Wpointer-arith -Wformat-security -Wmissing-format-attribute -Woverloaded-virtual -W")

        if ( EXIV2_TEAM_USE_SANITIZERS )
            # ASAN is available in gcc from 4.8 and UBSAN from 4.9
            # ASAN is available in clang from 3.1 and UBSAN from 3.3
            # UBSAN is not fatal by default, instead it only prints runtime errors to stderr
            # => make it fatal with -fno-sanitize-recover (gcc) or -fno-sanitize-recover=all (clang)
            # add -fno-omit-frame-pointer for better stack traces
            if ( COMPILER_IS_GCC )
                if ( CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 4.9 )
                    set(SANITIZER_FLAGS "-fno-omit-frame-pointer -fsanitize=address,undefined -fno-sanitize-recover")
                elseif( CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 4.8 )
                    set(SANITIZER_FLAGS "-fno-omit-frame-pointer -fsanitize=address")
                endif()
            elseif( COMPILER_IS_CLANG )
                if ( CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 4.9 )
                    set(SANITIZER_FLAGS "-fno-omit-frame-pointer -fsanitize=address,undefined -fno-sanitize-recover=all")
                elseif ( CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 3.4 )
                    set(SANITIZER_FLAGS "-fno-omit-frame-pointer -fsanitize=address,undefined")
                elseif( CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 3.1 )
                    set(SANITIZER_FLAGS "-fno-omit-frame-pointer -fsanitize=address")
                endif()
            endif()

            # sorry, ASAN does not work on Windows
            if ( NOT CYGWIN AND NOT MINGW AND NOT MSYS )
                set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${SANITIZER_FLAGS}")
                set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${SANITIZER_FLAGS}")
                set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${SANITIZER_FLAGS}")
                set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} ${SANITIZER_FLAGS}")
            endif()

        endif()

        if ( EXIV2_TEAM_EXTRA_WARNINGS )
            # Note that this is intended to be used only by Exiv2 developers/contributors.

            if ( COMPILER_IS_GCC )
                if ( CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 4.0 )
                    string(CONCAT EXTRA_COMPILE_FLAGS ${EXTRA_COMPILE_FLAGS}
                        " -Wextra"
                        " -Wlogical-op"
                        " -Wdouble-promotion"
                        " -Wshadow"
                        " -Wuseless-cast"
                        " -Wpointer-arith" # This warning is also enabled by -Wpedantic
                        " -Wformat=2"
                        #" -Wold-style-cast"
                    )
                endif ()

                if ( CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 5.0 )
                  string(CONCAT EXTRA_COMPILE_FLAGS ${EXTRA_COMPILE_FLAGS}
                    " -Warray-bounds=2"
                    )
                endif ()

                if ( CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 6.0 )
                    string(CONCAT EXTRA_COMPILE_FLAGS ${EXTRA_COMPILE_FLAGS}
                        " -Wduplicated-cond"
                    )
                endif ()

                if ( CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 7.0 )
                    string(CONCAT EXTRA_COMPILE_FLAGS ${EXTRA_COMPILE_FLAGS}
                        " -Wduplicated-branches"
                        " -Wrestrict"
                    )
                endif ()
            endif ()

            if ( COMPILER_IS_CLANG )
                # https://clang.llvm.org/docs/DiagnosticsReference.html
                # These variables are at least available since clang 3.9.1
                string(CONCAT EXTRA_COMPILE_FLAGS "-Wextra"
                    " -Wshadow"
                    " -Wassign-enum"
                    " -Wmicrosoft"
                    " -Wcomments"
                    " -Wconditional-uninitialized"
                    " -Wdirect-ivar-access"
                    " -Weffc++"
                    " -Wpointer-arith"
                    " -Wformat=2"
                    #" -Warray-bounds" # Enabled by default
                    # These two raises lot of warnings. Use them wisely
                    #" -Wconversion"
                    #" -Wold-style-cast"
                )
                # -Wdouble-promotion flag is not available in clang 3.4.2
                if ( CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 3.4.2 )
                    string(CONCAT EXTRA_COMPILE_FLAGS ${EXTRA_COMPILE_FLAGS}
                        " -Wdouble-promotion"
                    )
                endif ()
                # -Wcomma flag is not available in clang 3.8.1
                if ( CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 3.8.1 )
                    string(CONCAT EXTRA_COMPILE_FLAGS ${EXTRA_COMPILE_FLAGS}
                        " -Wcomma"
                    )
                endif ()
            endif ()


        endif ()
    endif()

endif ()

# http://stackoverflow.com/questions/10113017/setting-the-msvc-runtime-in-cmake
if(MSVC)
    find_program(CLCACHE name clcache.exe
        PATHS ENV CLCACHE_PATH
        PATH_SUFFIXES Scripts clcache-4.1.0
    )
    if (CLCACHE)
        message(STATUS "clcache found in ${CLCACHE}")
        if (CMAKE_BUILD_TYPE STREQUAL "Debug")
            message(WARNING "clcache only works for Release builds")
        else()
            set(CMAKE_CXX_COMPILER ${CLCACHE})
        endif()
    endif()

    set(variables
      CMAKE_CXX_FLAGS_DEBUG
      CMAKE_CXX_FLAGS_MINSIZEREL
      CMAKE_CXX_FLAGS_RELEASE
      CMAKE_CXX_FLAGS_RELWITHDEBINFO
    )

    if (NOT BUILD_SHARED_LIBS AND NOT EXIV2_ENABLE_DYNAMIC_RUNTIME)
         message(STATUS "MSVC -> forcing use of statically-linked runtime." )
         foreach(variable ${variables})
             if(${variable} MATCHES "/MD")
                 string(REGEX REPLACE "/MD" "/MT" ${variable} "${${variable}}")
             endif()
         endforeach()
    endif()

    # remove /Ob2 and /Ob1 - they cause linker issues
    set(obs /Ob2 /Ob1)
    foreach(ob ${obs})
        foreach(variable ${variables})
            if(${variable} MATCHES ${ob} )
                string(REGEX REPLACE ${ob} "" ${variable} "${${variable}}")
            endif()
      endforeach()
    endforeach()

    if ( EXIV2_EXTRA_WARNINGS )
        string(REGEX REPLACE "/W[0-4]" "/W4" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
    endif ()

    # Object Level Parallelism
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP")

    add_definitions(-DNOMINMAX -DWIN32_LEAN_AND_MEAN)

endif()