add_definitions(-DBUILDING_WITH_CMAKE=1)
add_definitions(-DHAVE_CONFIG_H=1)

# CODE_GENERATOR_PREPROCESSOR_WITH_LINEMARKERS only matters with GCC >= 4.7.0.  Since this
# version, -P does not output empty lines, which currently breaks make_names.pl in
# WebCore. Investigating whether make_names.pl should be changed instead is left as an exercise to
# the reader.
if (MSVC)
    # FIXME: Some codegenerators don't support paths with spaces. So use the executable name only.
    get_filename_component(CODE_GENERATOR_PREPROCESSOR_EXECUTABLE ${CMAKE_CXX_COMPILER} NAME)
    set(CODE_GENERATOR_PREPROCESSOR "${CODE_GENERATOR_PREPROCESSOR_EXECUTABLE} /nologo /EP")
    set(CODE_GENERATOR_PREPROCESSOR_WITH_LINEMARKERS "${CODE_GENERATOR_PREPROCESSOR}")
else ()
    set(CODE_GENERATOR_PREPROCESSOR "${CMAKE_CXX_COMPILER} -E -P -x c++")
    set(CODE_GENERATOR_PREPROCESSOR_WITH_LINEMARKERS "${CMAKE_CXX_COMPILER} -E -x c++")
endif ()

if (${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
    set(CMAKE_CXX_ARCHIVE_CREATE "<CMAKE_AR> cruT <TARGET> <LINK_FLAGS> <OBJECTS>")
    set(CMAKE_C_ARCHIVE_CREATE "<CMAKE_AR> cruT <TARGET> <LINK_FLAGS> <OBJECTS>")
    set(CMAKE_CXX_ARCHIVE_APPEND "<CMAKE_AR> ruT <TARGET> <LINK_FLAGS> <OBJECTS>")
    set(CMAKE_C_ARCHIVE_APPEND "<CMAKE_AR> ruT <TARGET> <LINK_FLAGS> <OBJECTS>")
endif ()

set_property(GLOBAL PROPERTY USE_FOLDERS ON)

if (CMAKE_COMPILER_IS_GNUCXX OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
    set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -fno-exceptions -fno-strict-aliasing")
    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -fno-exceptions -fno-strict-aliasing -fno-rtti")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
endif ()

# Detect Cortex-A53 core if CPU is ARM64 and OS is Linux.
# Query /proc/cpuinfo for each available core and check reported CPU part number: 0xd03 signals Cortex-A53.
# (see Main ID Register in ARM Cortex-A53 MPCore Processor Technical Reference Manual)
set(WTF_CPU_ARM64_CORTEXA53_INITIALVALUE OFF)
if (WTF_CPU_ARM64 AND (${CMAKE_SYSTEM_NAME} STREQUAL "Linux"))
    execute_process(COMMAND nproc OUTPUT_VARIABLE PROC_COUNT)
    math(EXPR PROC_MAX ${PROC_COUNT}-1)
    foreach (PROC_ID RANGE ${PROC_MAX})
        execute_process(COMMAND taskset -c ${PROC_ID} grep "^CPU part" /proc/cpuinfo OUTPUT_VARIABLE PROC_PART)
        if (PROC_PART MATCHES "0xd03")
            set(WTF_CPU_ARM64_CORTEXA53_INITIALVALUE ON)
            break ()
        endif ()
    endforeach ()
endif ()
option(WTF_CPU_ARM64_CORTEXA53 "Enable Cortex-A53-specific code paths" ${WTF_CPU_ARM64_CORTEXA53_INITIALVALUE})

if (WTF_CPU_ARM64_CORTEXA53)
    if (NOT WTF_CPU_ARM64)
        message(FATAL_ERROR "WTF_CPU_ARM64_CORTEXA53 set without WTF_CPU_ARM64")
    endif ()
    include(TestCXXAcceptsFlag)
    CHECK_CXX_ACCEPTS_FLAG(-mfix-cortex-a53-835769 CXX_ACCEPTS_MFIX_CORTEX_A53_835769)
    if (CXX_ACCEPTS_MFIX_CORTEX_A53_835769)
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfix-cortex-a53-835769")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mfix-cortex-a53-835769")
        message(STATUS "Enabling Cortex-A53 workaround for compiler")
    endif ()
endif ()

# Use ld.gold if it is available and isn't disabled explicitly
option(USE_LD_GOLD "Use GNU gold linker" ON)
if (USE_LD_GOLD)
    execute_process(COMMAND ${CMAKE_C_COMPILER} -fuse-ld=gold -Wl,--version ERROR_QUIET OUTPUT_VARIABLE LD_VERSION)
    if ("${LD_VERSION}" MATCHES "GNU gold")
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fuse-ld=gold")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fuse-ld=gold")
        set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--disable-new-dtags")
        set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--disable-new-dtags")
    else ()
        message(WARNING "GNU gold linker isn't available, using the default system linker.")
    endif ()
endif ()

option(DEBUG_FISSION "Use Debug Fission support")
if (DEBUG_FISSION)
    if (NOT USE_LD_GOLD)
        message(FATAL_ERROR "Need GNU gold linker for Debug Fission support")
    endif ()
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -gsplit-dwarf")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -gsplit-dwarf")
    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--gdb-index")
    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--gdb-index")
endif ()

if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Qunused-arguments")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Qunused-arguments")
endif ()

string(TOLOWER ${CMAKE_HOST_SYSTEM_PROCESSOR} LOWERCASE_CMAKE_HOST_SYSTEM_PROCESSOR)
if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" AND "${LOWERCASE_CMAKE_HOST_SYSTEM_PROCESSOR}" MATCHES "(i[3-6]86|x86)")
    # To avoid out of memory when building with debug option in 32bit system.
    # See https://bugs.webkit.org/show_bug.cgi?id=77327
    set(CMAKE_SHARED_LINKER_FLAGS_DEBUG "-Wl,--no-keep-memory ${CMAKE_SHARED_LINKER_FLAGS_DEBUG}")
endif ()

if (UNIX AND NOT APPLE)
    set(CMAKE_SHARED_LINKER_FLAGS "-Wl,--no-undefined ${CMAKE_SHARED_LINKER_FLAGS}")
endif ()

# GTK uses the GNU installation directories as defaults.
if (NOT PORT STREQUAL "GTK")
    set(LIB_INSTALL_DIR "${CMAKE_INSTALL_PREFIX}/lib" CACHE PATH "Absolute path to library installation directory")
    set(EXEC_INSTALL_DIR "${CMAKE_INSTALL_PREFIX}/bin" CACHE PATH "Absolute path to executable installation directory")
    set(LIBEXEC_INSTALL_DIR "${CMAKE_INSTALL_PREFIX}/bin" CACHE PATH "Absolute path to install executables executed by the library")
endif ()

# The Ninja generator does not yet know how to build archives in pieces, and so response
# files must be used to deal with very long linker command lines.
# See https://bugs.webkit.org/show_bug.cgi?id=129771
set(CMAKE_NINJA_FORCE_RESPONSE_FILE 1)