CMakeLists.txt

cmake_minimum_required(VERSION 2.8.6)
if (WIN32)
 option(CMAKE_USE_WIN32_THREADS_INIT "using WIN32 threads" ON)
endif()
set(VERSION "0.1")

if(NOT CMAKE_BUILD_TYPE)
  set(CMAKE_BUILD_TYPE Release CACHE STRING "Build type" FORCE)
  message(STATUS "Setting default build type: ${CMAKE_BUILD_TYPE}")
endif()
string(TOLOWER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE_LOWER)

# ARCH defines the target architecture, either by an explicit identifier or
# one of the following two keywords. By default, ARCH a value of 'native':
# target arch = host arch, binary is not portable. When ARCH is set to the
# string 'default', no -march arg is passed, which creates a binary that is
# portable across processors in the same family as host processor.  In cases
# when ARCH is not set to an explicit identifier, cmake's builtin is used
# to identify the target architecture, to direct logic in this cmake script.
# Since ARCH is a cached variable, it will not be set on first cmake invocation.
if (NOT ARCH OR ARCH STREQUAL "" OR ARCH STREQUAL "native" OR ARCH STREQUAL "default")
  set(ARCH_ID "${CMAKE_SYSTEM_PROCESSOR}")
else()
  set(ARCH_ID "${ARCH}")
endif()
string(TOLOWER "${ARCH_ID}" ARM_ID)
string(SUBSTRING "${ARM_ID}" 0 3 ARM_TEST)
if (ARM_TEST STREQUAL "arm")
  set(ARM 1)
  string(SUBSTRING "${ARM_ID}" 0 5 ARM_TEST)
  if (ARM_TEST STREQUAL "armv6")
    set(ARM6 1)
  endif()
  if (ARM_TEST STREQUAL "armv7")
    set(ARM7 1)
  endif()
endif()

if (ARM_ID STREQUAL "aarch64" OR ARM_ID STREQUAL "arm64" OR ARM_ID STREQUAL "armv8-a")
  set(ARM 1)
  set(ARM8 1)
  set(ARCH "armv8-a")
endif()

if(ARCH_ID STREQUAL "ppc64le")
  set(PPC64LE 1)
endif()

if(WIN32 OR ARM)
  set(OPT_FLAGS_RELEASE "-O2")
else()
  set(OPT_FLAGS_RELEASE "-Ofast")
endif()

# BUILD_TAG is used to select the build type to check for a new version
if(BUILD_TAG)
  message(STATUS "Building build tag ${BUILD_TAG}")
  add_definitions("-DBUILD_TAG=${BUILD_TAG}")
else()
  message(STATUS "Building without build tag")
endif()

set(CMAKE_C_FLAGS_RELEASE "-DNDEBUG ${OPT_FLAGS_RELEASE}")
set(CMAKE_CXX_FLAGS_RELEASE "-DNDEBUG ${OPT_FLAGS_RELEASE}")

list(INSERT CMAKE_MODULE_PATH 0
  "${CMAKE_SOURCE_DIR}/cmake")

if (NOT DEFINED ENV{DEVELOPER_LOCAL_TOOLS})
  message(STATUS "Could not find DEVELOPER_LOCAL_TOOLS in env (not required)")
  set(BOOST_IGNORE_SYSTEM_PATHS_DEFAULT OFF)
elseif ("$ENV{DEVELOPER_LOCAL_TOOLS}" EQUAL 1)
  message(STATUS "Found: env DEVELOPER_LOCAL_TOOLS = 1")
  set(BOOST_IGNORE_SYSTEM_PATHS_DEFAULT ON)
else()
  message(STATUS "Found: env DEVELOPER_LOCAL_TOOLS = 0")
  set(BOOST_IGNORE_SYSTEM_PATHS_DEFAULT OFF)
endif()

message(STATUS "BOOST_IGNORE_SYSTEM_PATHS defaults to ${BOOST_IGNORE_SYSTEM_PATHS_DEFAULT}")
option(BOOST_IGNORE_SYSTEM_PATHS "Ignore boost system paths for local boost installation" ${BOOST_IGNORE_SYSTEM_PATHS_DEFAULT})


set_property(GLOBAL PROPERTY USE_FOLDERS ON)
# set(CMAKE_CONFIGURATION_TYPES "Debug;Release")
set(CMAKE_CONFIGURATION_TYPES Debug RelWithDebInfo Release CACHE TYPE INTERNAL)
set(CMAKE_SKIP_INSTALL_RULES ON)
set(CMAKE_SKIP_PACKAGE_ALL_DEPENDENCY ON)
set(CMAKE_SUPPRESS_REGENERATION ON)
# enable_testing()
# copy CTestCustom.cmake to build dir to disable long running tests in 'make test'
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/CTestCustom.cmake ${CMAKE_CURRENT_BINARY_DIR})

project(Karbowanec)

include_directories(include src external "${CMAKE_CURRENT_BINARY_DIR}/version")  

# Check whether we're on a 32-bit or 64-bit system
if(CMAKE_SIZEOF_VOID_P EQUAL "8")
  set(DEFAULT_BUILD_64 ON)
else()
  set(DEFAULT_BUILD_64 OFF)
endif()
option(BUILD_64 "Build for 64-bit? 'OFF' builds for 32-bit." ${DEFAULT_BUILD_64})

if(BUILD_64)
  set(ARCH_WIDTH "64")
else()
  set(ARCH_WIDTH "32")
endif()
message(STATUS "Building for a ${ARCH_WIDTH}-bit system")

# Check if we're on FreeBSD so we can exclude the local miniupnpc (it should be installed from ports instead)
# CMAKE_SYSTEM_NAME checks are commonly known, but specifically taken from libsdl's CMakeLists
if(CMAKE_SYSTEM_NAME MATCHES "kFreeBSD.*|FreeBSD")
  set(FREEBSD TRUE)
endif()

# Check if we're on DragonFly BSD. See the README.md for build instructions.
if(CMAKE_SYSTEM_NAME MATCHES "DragonFly.*")
  set(DRAGONFLY TRUE)
endif()

# Check if we're on OpenBSD. See the README.md for build instructions.
if(CMAKE_SYSTEM_NAME MATCHES "kOpenBSD.*|OpenBSD.*")
  set(OPENBSD TRUE)
endif()

# TODO: check bsdi, NetBSD, to see if they need the same FreeBSD changes
#
# elseif(CMAKE_SYSTEM_NAME MATCHES "kNetBSD.*|NetBSD.*")
#   set(NETBSD TRUE)
# elseif(CMAKE_SYSTEM_NAME MATCHES ".*BSDI.*")
#   set(BSDI TRUE)

#include_directories(include src contrib/epee/include external "${CMAKE_BINARY_DIR}/version")

if(APPLE)
  include_directories(SYSTEM /usr/include/malloc)
  if(POLICY CMP0042)
    cmake_policy(SET CMP0042 NEW)
  endif()
  enable_language(ASM)
endif()

if(MSVC OR MINGW)
  set(DEFAULT_STATIC true)
else()
  set(DEFAULT_STATIC false)
endif()

if(MSVC)
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/src/Platform/Windows)
elseif(APPLE)
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/src/Platform/OSX)
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/src/Platform/Posix)
elseif(ANDROID)
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/src/Platform/Android)
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/src/Platform/Posix)
else()
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/src/Platform/Linux)
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/src/Platform/Posix)
endif()

option(STATIC "Link libraries statically" ${DEFAULT_STATIC})
set(STATIC ${MSVC} CACHE BOOL "Link libraries statically")

# This is a CMake built-in switch that concerns internal libraries
if (NOT DEFINED BUILD_SHARED_LIBS AND NOT STATIC AND CMAKE_BUILD_TYPE_LOWER STREQUAL "debug")
    set(BUILD_SHARED_LIBS ON)
endif()

if (BUILD_SHARED_LIBS)
  message(STATUS "Building internal libraries with position independent code")
  set(PIC_FLAG "-fPIC")
  add_definitions("-DBUILD_SHARED_LIBS")
else()
  message(STATUS "Building internal libraries as static")
endif()

if(MINGW)
  string(REGEX MATCH "^[^/]:/[^/]*" msys2_install_path "${CMAKE_C_COMPILER}")
  message(STATUS "MSYS location: ${msys2_install_path}")
  set(CMAKE_INCLUDE_PATH "${msys2_install_path}/mingw${ARCH_WIDTH}/include")
  # This is necessary because otherwise CMake will make Boost libraries -lfoo
  # rather than a full path. Unfortunately, this makes the shared libraries get
  # linked due to a bug in CMake which misses putting -static flags around the
  # -lfoo arguments.
  set(DEFLIB ${msys2_install_path}/mingw${ARCH_WIDTH}/lib)
  list(REMOVE_ITEM CMAKE_C_IMPLICIT_LINK_DIRECTORIES ${DEFLIB})
  list(REMOVE_ITEM CMAKE_CXX_IMPLICIT_LINK_DIRECTORIES ${DEFLIB})
endif()

if(STATIC)
  if(MSVC)
    set(CMAKE_FIND_LIBRARY_SUFFIXES .lib .dll.a .a ${CMAKE_FIND_LIBRARY_SUFFIXES})
  else()
    set(CMAKE_FIND_LIBRARY_SUFFIXES .a ${CMAKE_FIND_LIBRARY_SUFFIXES})
  endif()
endif()

if (UNIX AND NOT APPLE)
  # Note that at the time of this writing the -Wstrict-prototypes flag added below will make this fail
  set(THREADS_PREFER_PTHREAD_FLAG ON)
  find_package(Threads)
endif()

add_subdirectory(external)

# Final setup for miniupnpc
if(STATIC OR IOS)
 #if(UPNP_STATIC OR IOS)
  add_definitions("-DUPNP_STATIC")
 else()
  add_definitions("-DUPNP_DYNAMIC")
  include_directories(${UPNP_INCLUDE})
 endif()

if(MSVC)
  add_definitions("/bigobj /MP /W3 /GS- /D_CRT_SECURE_NO_WARNINGS /wd4996 /wd4345 /D_WIN32_WINNT=0x0600 /DWIN32_LEAN_AND_MEAN /DGTEST_HAS_TR1_TUPLE=0 /D_VARIADIC_MAX=8 /D__SSE4_1__")
  #set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /Dinline=__inline")
  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /STACK:10485760")
  if(STATIC)    
	foreach(VAR CMAKE_C_FLAGS_DEBUG CMAKE_CXX_FLAGS_DEBUG CMAKE_C_FLAGS_RELWITHDEBINFO CMAKE_CXX_FLAGS_RELWITHDEBINFO CMAKE_C_FLAGS_RELEASE CMAKE_CXX_FLAGS_RELEASE)
      string(REPLACE "/MD" "/MT" ${VAR} "${${VAR}}")
    endforeach()
  endif()
  include_directories(SYSTEM ${CMAKE_CURRENT_SOURCE_DIR}/src/platform/msc)
else()
  include(TestCXXAcceptsFlag)
  set(ARCH native CACHE STRING "CPU to build for: -march value or default to not pass -march at all")
  message(STATUS "Building on ${CMAKE_SYSTEM_PROCESSOR} for ${ARCH}")
  if("${ARCH}" STREQUAL "default")
    set(ARCH_FLAG "")
  elseif(PPC64LE)
    set(ARCH_FLAG "-mcpu=${ARCH}")
  else()
    set(ARCH_FLAG "-march=${ARCH}")
  endif()
  set(WARNINGS "-Wall -Wextra -Wpointer-arith -Wundef -Wvla -Wwrite-strings -Werror -Wno-error=extra -Wno-error=unused-function -Wno-error=deprecated-declarations -Wno-error=sign-compare -Wno-error=strict-aliasing -Wno-error=type-limits -Wno-unused-parameter -Wno-error=unused-variable -Wno-error=undef -Wno-error=uninitialized -Wno-error=unused-result")
  if(NOT MINGW)
    set(WARNINGS_AS_ERRORS_FLAG "-Werror")
  endif()
  if(CMAKE_C_COMPILER_ID STREQUAL "Clang")
    # maybe remove
    set(WARNINGS "${WARNINGS} -Wno-error=mismatched-tags -Wno-error=null-conversion -Wno-overloaded-shift-op-parentheses -Wno-error=shift-count-overflow -Wno-error=tautological-constant-out-of-range-compare -Wno-error=unused-private-field -Wno-error=unneeded-internal-declaration -Wno-error=unused-function")
	if(NOT APPLE) 
		set(WARNINGS "${WARNINGS} -Wno-unused-lambda-capture")
	endif()
	# this ^
	if(ARM)
      set(WARNINGS "${WARNINGS} -Wno-error=inline-asm")
    endif()
  else()
    set(WARNINGS "${WARNINGS} -Wlogical-op -Wno-error=maybe-uninitialized -Wno-error=clobbered -Wno-error=unused-but-set-variable")
  endif()
  if(MINGW)
    set(WARNINGS "${WARNINGS} -Wno-error=unused-value -Wno-error=unused-but-set-variable")
    set(MINGW_FLAG "-DWIN32_LEAN_AND_MEAN")
	set(Boost_THREADAPI win32)
    include_directories(SYSTEM src/platform/mingw)
	# mingw doesn't support LTO (multiple definition errors at link time)
    set(USE_LTO_DEFAULT false)
    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--stack,10485760")
	if(NOT BUILD_64)
      add_definitions(-DWINVER=0x0501 -D_WIN32_WINNT=0x0501)
    endif()
  else()
    set(MINGW_FLAG "")
  endif()
  set(C_WARNINGS "-Waggregate-return -Wnested-externs -Wold-style-definition -Wstrict-prototypes")
  set(CXX_WARNINGS "-Wno-reorder -Wno-missing-field-initializers")
  try_compile(STATIC_ASSERT_RES "${CMAKE_CURRENT_BINARY_DIR}/static-assert" "${CMAKE_CURRENT_SOURCE_DIR}/utils/test-static-assert.c" COMPILE_DEFINITIONS "-std=c11")
  if(STATIC_ASSERT_RES)
    set(STATIC_ASSERT_FLAG "")
  else()
    set(STATIC_ASSERT_FLAG "-Dstatic_assert=_Static_assert")
  endif()
  
  try_compile(STATIC_ASSERT_CPP_RES "${CMAKE_CURRENT_BINARY_DIR}/static-assert" "${CMAKE_CURRENT_SOURCE_DIR}/cmake/test-static-assert.cpp" COMPILE_DEFINITIONS "-std=c++11")
  if(STATIC_ASSERT_CPP_RES)
    set(STATIC_ASSERT_CPP_FLAG "")
  else()
    set(STATIC_ASSERT_CPP_FLAG "-Dstatic_assert=_Static_assert")
  endif()
  
  # With GCC 6.1.1 the compiled binary malfunctions due to aliasing. Until that
  # is fixed in the code (Issue #847), force compiler to be conservative.
  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fno-strict-aliasing")
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-strict-aliasing")
  
  option(NO_AES "Explicitly disable AES support" ${NO_AES})
  
  if(NOT NO_AES AND NOT ARM AND NOT PPC64LE)
    message(STATUS "AES support enabled")
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -maes")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -maes")
  elseif(PPC64LE)
    message(STATUS "AES support not available on ppc64le")
  elseif(ARM6)
    message(STATUS "AES support not available on ARMv6")
  elseif(ARM7)
    message(STATUS "AES support not available on ARMv7")
  elseif(ARM8)
    CHECK_CXX_ACCEPTS_FLAG("-march=${ARCH}+crypto" ARCH_PLUS_CRYPTO)
    if(ARCH_PLUS_CRYPTO)
      message(STATUS "Crypto extensions enabled for ARMv8")
      set(ARCH_FLAG "-march=${ARCH}+crypto")
    else()
      message(STATUS "Crypto extensions unavailable on your ARMv8 device")
    endif()
  else()
    message(STATUS "AES support disabled")
  endif()
  
  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c11 -D_GNU_SOURCE ${MINGW_FLAG} ${STATIC_ASSERT_FLAG} ${WARNINGS} ${C_WARNINGS} ${ARCH_FLAG} ${PIC_FLAG}")
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -D_GNU_SOURCE ${MINGW_FLAG} ${STATIC_ASSERT_CPP_FLAG} ${WARNINGS} ${CXX_WARNINGS} ${ARCH_FLAG} ${PIC_FLAG}")

  # With GCC 6.1.1 the compiled binary malfunctions due to aliasing. Until that
  # is fixed in the code (Issue #847), force compiler to be conservative.
  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fno-strict-aliasing")
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-strict-aliasing")
  
  
  if(ARM)
    message(STATUS "Setting FPU Flags for ARM Processors")

    #NB NEON hardware does not fully implement the IEEE 754 standard for floating-point arithmetic
    #Need custom assembly code to take full advantage of NEON SIMD

    #Cortex-A5/9  -mfpu=neon-fp16
    #Cortex-A7/15 -mfpu=neon-vfpv4
    #Cortex-A8    -mfpu=neon
    #ARMv8  	  -FP and SIMD on by default for all ARM8v-A series, NO -mfpu setting needed

    #For custom -mtune, processor IDs for ARMv8-A series:
    #0xd04 - Cortex-A35
    #0xd07 - Cortex-A57
    #0xd08 - Cortex-A72
    #0xd03 - Cortex-A73

    if(NOT ARM8)
      CHECK_CXX_ACCEPTS_FLAG(-mfpu=vfp3-d16 CXX_ACCEPTS_VFP3_D16)
      CHECK_CXX_ACCEPTS_FLAG(-mfpu=vfp4 CXX_ACCEPTS_VFP4)
      CHECK_CXX_ACCEPTS_FLAG(-mfloat-abi=hard CXX_ACCEPTS_MFLOAT_HARD)
      CHECK_CXX_ACCEPTS_FLAG(-mfloat-abi=softfp CXX_ACCEPTS_MFLOAT_SOFTFP)
    endif()

    if(ARM8)
      CHECK_CXX_ACCEPTS_FLAG(-mfix-cortex-a53-835769 CXX_ACCEPTS_MFIX_CORTEX_A53_835769)
      CHECK_CXX_ACCEPTS_FLAG(-mfix-cortex-a53-843419 CXX_ACCEPTS_MFIX_CORTEX_A53_843419)
    endif()

    if(ARM6)
      message(STATUS "Selecting VFP for ARMv6")
      set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfpu=vfp")
      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mfpu=vfp")
    endif(ARM6)

    if(ARM7)
      if(CXX_ACCEPTS_VFP3_D16 AND NOT CXX_ACCEPTS_VFP4)
        message(STATUS "Selecting VFP3 for ARMv7")
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfpu=vfp3-d16")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mfpu=vfp3-d16")
      endif()

      if(CXX_ACCEPTS_VFP4)
        message(STATUS "Selecting VFP4 for ARMv7")
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfpu=vfp4")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mfpu=vfp4")
      endif()

      if(CXX_ACCEPTS_MFLOAT_HARD)
        message(STATUS "Setting Hardware ABI for Floating Point")
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfloat-abi=hard")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mfloat-abi=hard")
      endif()

      if(CXX_ACCEPTS_MFLOAT_SOFTFP AND NOT CXX_ACCEPTS_MFLOAT_HARD)
        message(STATUS "Setting Software ABI for Floating Point")
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfloat-abi=softfp")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mfloat-abi=softfp")
      endif()
    endif(ARM7)

    if(ARM8)
      if(CXX_ACCEPTS_MFIX_CORTEX_A53_835769)
        message(STATUS "Enabling Cortex-A53 workaround 835769")
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfix-cortex-a53-835769")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mfix-cortex-a53-835769")
      endif()

      if(CXX_ACCEPTS_MFIX_CORTEX_A53_843419)
        message(STATUS "Enabling Cortex-A53 workaround 843419")
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfix-cortex-a53-843419")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mfix-cortex-a53-843419")
      endif()
    endif(ARM8)

  endif(ARM)

  if(ANDROID AND NOT BUILD_GUI_DEPS STREQUAL "ON" OR IOS)
    #From Android 5: "only position independent executables (PIE) are supported" 
    message(STATUS "Enabling PIE executable")
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIE")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIE -DANDROID -DBOOST_COROUTINES_NO_DEPRECATION_WARNING")
    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_CXX_FLAGS} -fPIE -pie -ldl -pthread")
  endif()

  if(APPLE)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DGTEST_HAS_TR1_TUPLE=0")
  endif()
  
  set(DEBUG_FLAGS "-g3")
  if(CMAKE_C_COMPILER_ID STREQUAL "GNU" AND NOT (CMAKE_C_COMPILER_VERSION VERSION_LESS 4.8))
    set(DEBUG_FLAGS "-g3 -Og")
  else()
    set(DEBUG_FLAGS "-g3 -O0")
  endif()
  
  if(NOT DEFINED USE_LTO_DEFAULT)
    set(USE_LTO_DEFAULT false)
  endif()
  set(USE_LTO ${USE_LTO_DEFAULT} CACHE BOOL "Use Link-Time Optimization (Release mode only)")

  if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
    # There is a clang bug that does not allow to compile code that uses AES-NI intrinsics if -flto is enabled, so explicitly disable
    set(USE_LTO false)
  endif()

  if(USE_LTO)
    set(RELEASE_FLAGS "${RELEASE_FLAGS} -flto")
    if(STATIC)
      set(RELEASE_FLAGS "${RELEASE_FLAGS} -ffat-lto-objects")
    endif()
    # Since gcc 4.9 the LTO format is non-standard (slim), so we need the gcc-specific ar and ranlib binaries
    if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND NOT (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9.0) AND NOT OPENBSD AND NOT DRAGONFLY)
      # When invoking cmake on distributions on which gcc's binaries are prefixed
      # with an arch-specific triplet, the user must specify -DCHOST=<prefix>
      if (DEFINED CHOST)
        set(CMAKE_AR "${CHOST}-gcc-ar")
        set(CMAKE_RANLIB "${CHOST}-gcc-ranlib")
      else()
        set(CMAKE_AR "gcc-ar")
        set(CMAKE_RANLIB "gcc-ranlib")
      endif()
    endif()
  endif()

  set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} ${DEBUG_FLAGS}")
  set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} ${DEBUG_FLAGS}")
  set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} ${RELEASE_FLAGS}")
  set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${RELEASE_FLAGS}")

  if(STATIC)
    # STATIC already configures most deps to be linked in statically,
    # here we make more deps static if the platform permits it
    if (MINGW)
      # On Windows, this is as close to fully-static as we get:
      # this leaves only deps on /c/Windows/system32/*.dll
      set(STATIC_FLAGS "-static")
    elseif (NOT (APPLE OR FREEBSD OR OPENBSD OR DRAGONFLY))
      # On Linux, we don't support fully static build, but these can be static
      set(STATIC_FLAGS "-static-libgcc -static-libstdc++")
    endif()
    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${STATIC_FLAGS} ")
  endif()
endif()

if(${CMAKE_SYSTEM_NAME} STREQUAL "Linux" AND NOT ANDROID)
    set(CMAKE_EXE_LINKER_FLAGS "-pthread")
endif()

if (${BOOST_IGNORE_SYSTEM_PATHS} STREQUAL "ON")
  set(Boost_NO_SYSTEM_PATHS TRUE)
endif()

set(OLD_LIB_SUFFIXES ${CMAKE_FIND_LIBRARY_SUFFIXES})
if(STATIC)
  if(MINGW)
    set(CMAKE_FIND_LIBRARY_SUFFIXES .a)
  endif()

  set(Boost_USE_STATIC_LIBS ON)
  set(Boost_USE_STATIC_RUNTIME ON)
endif()
find_package(Boost 1.57 QUIET REQUIRED COMPONENTS system filesystem thread date_time chrono regex serialization program_options coroutine context atomic)

set(CMAKE_FIND_LIBRARY_SUFFIXES ${OLD_LIB_SUFFIXES})
if(NOT Boost_FOUND)
  die("Could not find Boost libraries, please make sure you have installed Boost or libboost-all-dev (1.58) or the equivalent")
elseif(Boost_FOUND)
  message(STATUS "Found Boost Version: ${Boost_VERSION}")
endif()

if(MINGW)
  set(Boost_LIBRARIES "${Boost_LIBRARIES};ws2_32;mswsock;iphlpapi")
elseif(APPLE OR OPENBSD OR ANDROID)
  set(Boost_LIBRARIES "${Boost_LIBRARIES}")
elseif(NOT MSVC)
  set(Boost_LIBRARIES "${Boost_LIBRARIES};rt")
endif()

include_directories(SYSTEM ${Boost_INCLUDE_DIRS})
if(MINGW)
  set(EXTRA_LIBRARIES mswsock;ws2_32;iphlpapi)
elseif(APPLE OR OPENBSD OR ANDROID)
  set(EXTRA_LIBRARIES "")
elseif(FREEBSD)
  set(EXTRA_LIBRARIES execinfo)
elseif(DRAGONFLY)
  find_library(COMPAT compat)
  set(EXTRA_LIBRARIES execinfo ${COMPAT})
elseif(NOT MSVC)
  find_library(RT rt)
  set(EXTRA_LIBRARIES ${RT})
endif()

list(APPEND EXTRA_LIBRARIES ${CMAKE_DL_LIBS})

if(ANDROID)
  set(ATOMIC /opt/android/boost_1_65_1/android32/lib/libboost_atomic.a)
  set(THREAD /opt/android/boost_1_65_1/android32/lib/libboost_thread.a)
endif()
if(CMAKE_C_COMPILER_ID STREQUAL "Clang" AND ARCH_WIDTH EQUAL "32" AND NOT IOS)
  find_library(ATOMIC atomic)
  find_library(THREAD thread)
  list(APPEND EXTRA_LIBRARIES ${ATOMIC})
  list(APPEND EXTRA_LIBRARIES ${THREAD})
endif()

include("${CMAKE_CURRENT_SOURCE_DIR}/src/version.cmake")

function (treat_warnings_as_errors dirs)
  foreach(dir ${ARGV})
    set_property(DIRECTORY ${dir}
      APPEND PROPERTY COMPILE_FLAGS "-Werror")
  endforeach()
endfunction()

add_subdirectory(src)

treat_warnings_as_errors(src)

option(BUILD_TESTS "Build tests." OFF)

if(BUILD_TESTS)
  add_subdirectory(tests)
endif()



set(COMMIT_ID_IN_VERSION ON CACHE BOOL "Include commit ID in version")
file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/version")
if (NOT COMMIT_ID_IN_VERSION)
  set(VERSION "${VERSION}-unknown")
  configure_file("${CMAKE_CURRENT_SOURCE_DIR}/src/version.h.in" "${CMAKE_CURRENT_BINARY_DIR}/version/version.h")
  add_custom_target(version ALL)
elseif(DEFINED COMMIT)
  string(REPLACE "." "\\." VERSION_RE "${VERSION}")
  if(NOT REFS MATCHES "(\\(|, )tag: v${VERSION_RE}(\\)|, )")
    set(VERSION "${VERSION}-g${COMMIT}")
  endif()
  configure_file("${CMAKE_CURRENT_SOURCE_DIR}/src/version.h.in" "${CMAKE_CURRENT_BINARY_DIR}/version/version.h")
  add_custom_target(version ALL)
else()
  find_package(Git QUIET)
  if(Git_FOUND OR GIT_FOUND)
    message(STATUS "Found Git: ${GIT_EXECUTABLE}")
    add_custom_target(version ALL "${CMAKE_COMMAND}" "-D" "VERSION=${VERSION}" "-D" "GIT=${GIT_EXECUTABLE}" "-D" "TO=${CMAKE_CURRENT_BINARY_DIR}/version/version.h" "-P" "${CMAKE_CURRENT_SOURCE_DIR}/src/version.cmake" WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}")
  else()
    message(STATUS "WARNING: Git was not found!")
    set(VERSION "${VERSION}-unknown")
    configure_file("${CMAKE_CURRENT_SOURCE_DIR}/src/version.h.in" "${CMAKE_CURRENT_BINARY_DIR}/version/version.h")
    add_custom_target(version ALL)
  endif()
endif()