# Extra preprocessor definitions that will be added to all pcsx2 builds
set(PCSX2_DEFS "")

#-------------------------------------------------------------------------------
# Misc option
#-------------------------------------------------------------------------------
option(DISABLE_BUILD_DATE "Disable including the binary compile date")
option(ENABLE_TESTS "Enables building the unit tests" ON)
set(USE_SYSTEM_LIBS "AUTO" CACHE STRING "Use system libraries instead of bundled libraries.  ON - Always use system and fail if unavailable, OFF - Always use bundled, AUTO - Use system if available, otherwise use bundled.  Default is AUTO")
optional_system_library(fmt)
optional_system_library(ryml)
optional_system_library(zstd)
optional_system_library(libzip)
optional_system_library(SDL2)
option(LTO_PCSX2_CORE "Enable LTO/IPO/LTCG on the subset of pcsx2 that benefits most from it but not anything else")
option(USE_VTUNE "Plug VTUNE to profile GS JIT.")
option(USE_ACHIEVEMENTS "Build with RetroAchievements support" ON)
option(USE_DISCORD_PRESENCE "Enable support for Discord Rich Presence" ON)

#-------------------------------------------------------------------------------
# Graphical option
#-------------------------------------------------------------------------------
option(USE_OPENGL "Enable OpenGL GS renderer" ON)
option(USE_VULKAN "Enable Vulkan GS renderer" ON)

#-------------------------------------------------------------------------------
# Path and lib option
#-------------------------------------------------------------------------------
option(CUBEB_API "Build Cubeb support on SPU2" ON)
option(QT_BUILD "Build Qt frontend" ON)

if(UNIX AND NOT APPLE)
	option(ENABLE_SETCAP "Enable networking capability for DEV9" OFF)
	option(USE_LEGACY_USER_DIRECTORY "Use legacy home/PCSX2 user directory instead of XDG standard" OFF)
	option(X11_API "Enable X11 support" ON)
	option(WAYLAND_API "Enable Wayland support" ON)
endif()

if(APPLE)
	option(OSX_USE_DEFAULT_SEARCH_PATH "Don't prioritize system library paths" OFF)
	option(SKIP_POSTPROCESS_BUNDLE "Skip postprocessing bundle for redistributability" OFF)
endif()

#-------------------------------------------------------------------------------
# Compiler extra
#-------------------------------------------------------------------------------
option(USE_ASAN "Enable address sanitizer")

if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
	set(USE_CLANG TRUE)
	message(STATUS "Building with Clang/LLVM.")
elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Intel")
	set(USE_ICC TRUE)
	message(STATUS "Building with Intel's ICC.")
elseif(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
	set(USE_GCC TRUE)
	message(STATUS "Building with GNU GCC")
elseif(MSVC)
	message(STATUS "Building with MSVC")
else()
	message(FATAL_ERROR "Unknown compiler: ${CMAKE_CXX_COMPILER_ID}")
endif()

#-------------------------------------------------------------------------------
# if no build type is set, use Devel as default
# Note without the CMAKE_BUILD_TYPE options the value is still defined to ""
# Ensure that the value set by the User is correct to avoid some bad behavior later
#-------------------------------------------------------------------------------
if(NOT CMAKE_BUILD_TYPE MATCHES "Debug|Devel|MinSizeRel|RelWithDebInfo|Release")
	set(CMAKE_BUILD_TYPE Devel)
	message(STATUS "BuildType set to ${CMAKE_BUILD_TYPE} by default")
endif()
# Add Devel build type
set(CMAKE_C_FLAGS_DEVEL "${CMAKE_C_FLAGS_RELWITHDEBINFO}"
	CACHE STRING "Flags used by the C compiler during development builds" FORCE)
set(CMAKE_CXX_FLAGS_DEVEL "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}"
	CACHE STRING "Flags used by the C++ compiler during development builds" FORCE)
set(CMAKE_LINKER_FLAGS_DEVEL "${CMAKE_LINKER_FLAGS_RELWITHDEBINFO}"
	CACHE STRING "Flags used for linking binaries during development builds" FORCE)
set(CMAKE_SHARED_LINKER_FLAGS_DEVEL "${CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO}"
	CACHE STRING "Flags used for linking shared libraries during development builds" FORCE)
set(CMAKE_EXE_LINKER_FLAGS_DEVEL "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO}"
	CACHE STRING "Flags used for linking executables during development builds" FORCE)
if(CMAKE_CONFIGURATION_TYPES)
	list(INSERT CMAKE_CONFIGURATION_TYPES 0 Devel)
endif()
mark_as_advanced(CMAKE_C_FLAGS_DEVEL CMAKE_CXX_FLAGS_DEVEL CMAKE_LINKER_FLAGS_DEVEL CMAKE_SHARED_LINKER_FLAGS_DEVEL CMAKE_EXE_LINKER_FLAGS_DEVEL)

#-------------------------------------------------------------------------------
# Select the architecture
#-------------------------------------------------------------------------------
option(DISABLE_ADVANCE_SIMD "Disable advance use of SIMD (SSE2+ & AVX)" OFF)

# Print if we are cross compiling.
if(CMAKE_CROSSCOMPILING)
	message(STATUS "Cross compilation is enabled.")
else()
	message(STATUS "Cross compilation is disabled.")
endif()

# Architecture bitness detection
include(TargetArch)
target_architecture(PCSX2_TARGET_ARCHITECTURES)
if(${PCSX2_TARGET_ARCHITECTURES} MATCHES "x86_64")
	message(STATUS "Compiling a ${PCSX2_TARGET_ARCHITECTURES} build on a ${CMAKE_HOST_SYSTEM_PROCESSOR} host.")
else()
	message(FATAL_ERROR "Unsupported architecture: ${PCSX2_TARGET_ARCHITECTURES}")
endif()

if(${PCSX2_TARGET_ARCHITECTURES} MATCHES "x86_64")
	# x86_64 requires -fPIC
	set(CMAKE_POSITION_INDEPENDENT_CODE ON)

	if(NOT DEFINED ARCH_FLAG AND NOT MSVC)
		if (DISABLE_ADVANCE_SIMD)
			if (USE_ICC)
				set(ARCH_FLAG "-msse2 -msse4.1")
			else()
				set(ARCH_FLAG "-msse -msse2 -msse4.1 -mfxsr")
			endif()
		else()
			#set(ARCH_FLAG "-march=native -fabi-version=6")
			set(ARCH_FLAG "-march=native")
		endif()
	endif()
	list(APPEND PCSX2_DEFS _ARCH_64=1 _M_X86=1)
	set(_ARCH_64 1)
	set(_M_X86 1)
else()
	# All but i386 requires -fPIC
	set(CMAKE_POSITION_INDEPENDENT_CODE ON)

	message(FATAL_ERROR "Unsupported architecture: ${PCSX2_TARGET_ARCHITECTURES}")
endif()
string(REPLACE " " ";" ARCH_FLAG_LIST "${ARCH_FLAG}")
add_compile_options("${ARCH_FLAG_LIST}")

#-------------------------------------------------------------------------------
# Set some default compiler flags
#-------------------------------------------------------------------------------
option(USE_PGO_GENERATE "Enable PGO optimization (generate profile)")
option(USE_PGO_OPTIMIZE "Enable PGO optimization (use profile)")

# Note1: Builtin strcmp/memcmp was proved to be slower on Mesa than stdlib version.
# Note2: float operation SSE is impacted by the PCSX2 SSE configuration. In particular, flush to zero denormal.
if(MSVC)
	add_compile_options("$<$<COMPILE_LANGUAGE:CXX>:/Zc:externConstexpr>")
else()
	add_compile_options(-pipe -fvisibility=hidden -pthread -fno-builtin-strcmp -fno-builtin-memcmp -mfpmath=sse)

	# -fno-operator-names should only be for C++ files, not C files.
	add_compile_options($<$<COMPILE_LANGUAGE:CXX>:-fno-operator-names>)
endif()

set(CONFIG_REL_NO_DEB $<OR:$<CONFIG:Release>,$<CONFIG:MinSizeRel>>)
set(CONFIG_ANY_REL $<OR:$<CONFIG:Release>,$<CONFIG:MinSizeRel>,$<CONFIG:RelWithDebInfo>>)

if(WIN32)
	add_compile_definitions(
		$<$<CONFIG:Debug>:_ITERATOR_DEBUG_LEVEL=2>
		$<$<CONFIG:Devel>:_ITERATOR_DEBUG_LEVEL=1>
		$<${CONFIG_ANY_REL}:_ITERATOR_DEBUG_LEVEL=0>
	)
	list(APPEND PCSX2_DEFS TIXML_USE_STL _SCL_SECURE_NO_WARNINGS _UNICODE UNICODE)
endif()

if(MSVC)
	# Enable PDB generation in release builds
	add_compile_options(
		$<${CONFIG_REL_NO_DEB}:/Zi>
	)
	add_link_options(
		$<${CONFIG_REL_NO_DEB}:/DEBUG>
		$<${CONFIG_REL_NO_DEB}:/OPT:REF>
		$<${CONFIG_REL_NO_DEB}:/OPT:ICF>
	)
endif()

if(USE_VTUNE)
	list(APPEND PCSX2_DEFS ENABLE_VTUNE)
endif()

if(USE_OPENGL)
	list(APPEND PCSX2_DEFS ENABLE_OPENGL)
endif()

if(USE_VULKAN)
	list(APPEND PCSX2_DEFS ENABLE_VULKAN)
endif()

if(X11_API)
	list(APPEND PCSX2_DEFS X11_API)
endif()

if(WAYLAND_API)
	list(APPEND PCSX2_DEFS WAYLAND_API)
endif()

# -Wno-attributes: "always_inline function might not be inlinable" <= real spam (thousand of warnings!!!)
# -Wno-missing-field-initializers: standard allow to init only the begin of struct/array in static init. Just a silly warning.
# Note: future GCC (aka GCC 5.1.1) has less false positive so warning could maybe put back
# -Wno-unused-function: warn for function not used in release build
# -Wno-unused-value: lots of warning for this kind of statements "0 && ...". There are used to disable some parts of code in release/dev build.
# -Wno-format*: Yeah, these need to be taken care of, but...
# -Wno-stringop-truncation: Who comes up with these compiler warnings, anyways?
# -Wno-stringop-overflow: Probably the same people as this one...
# -Wno-maybe-uninitialized: Lots of gcc warnings like "‘test.GSVector8i::<anonymous>.GSVector8i::<unnamed union>::m’ may be used uninitialized" if this is removed.

if (MSVC)
	set(DEFAULT_WARNINGS)
else()
	set(DEFAULT_WARNINGS -Wall -Wextra -Wno-maybe-uninitialized -Wno-attributes -Wno-unused-function -Wno-unused-parameter -Wno-missing-field-initializers -Wno-format -Wno-format-security)
	if (NOT USE_ICC)
		list(APPEND DEFAULT_WARNINGS -Wno-unused-value)
	endif()
endif()

if (USE_GCC)
	list(APPEND DEFAULT_WARNINGS -Wno-stringop-truncation -Wno-stringop-overflow)
endif()


# -Wstrict-aliasing=n: to fix one day aliasing issue. n=1/2/3
if (USE_ICC)
	set(AGGRESSIVE_WARNING -Wstrict-aliasing)
elseif(NOT MSVC)
	set(AGGRESSIVE_WARNING -Wstrict-aliasing -Wstrict-overflow=1)
endif()

if (USE_CLANG)
	# -Wno-deprecated-register: glib issue...
	list(APPEND DEFAULT_WARNINGS -Wno-deprecated-register -Wno-c++14-extensions)
endif()

if (USE_PGO_GENERATE OR USE_PGO_OPTIMIZE)
	add_compile_options("-fprofile-dir=${CMAKE_SOURCE_DIR}/profile")
endif()

if (USE_PGO_GENERATE)
	add_compile_options(-fprofile-generate)
endif()

if(USE_PGO_OPTIMIZE)
	add_compile_options(-fprofile-use)
endif()

list(APPEND PCSX2_DEFS
	"$<$<CONFIG:Debug>:PCSX2_DEVBUILD;PCSX2_DEBUG;_DEBUG>"
	"$<$<CONFIG:Devel>:PCSX2_DEVBUILD;_DEVEL>")

if (USE_ASAN)
	add_compile_options(-fsanitize=address)
	add_link_options(-fsanitize=address)
	list(APPEND PCSX2_DEFS ASAN_WORKAROUND)
endif()

if(USE_CLANG AND TIMETRACE)
	add_compile_options(-ftime-trace)
endif()

set(PCSX2_WARNINGS ${DEFAULT_WARNINGS} ${AGGRESSIVE_WARNING})

if(DISABLE_BUILD_DATE)
	message(STATUS "Disabling the inclusion of the binary compile date.")
	list(APPEND PCSX2_DEFS DISABLE_BUILD_DATE)
endif()

#-------------------------------------------------------------------------------
# MacOS-specific things
#-------------------------------------------------------------------------------

if(NOT CMAKE_GENERATOR MATCHES "Xcode")
	# Assume Xcode builds aren't being used for distribution
	# Helpful because Xcode builds don't build multiple metallibs for different macOS versions
	# Also helpful because Xcode's interactive shader debugger requires apps be built for the latest macOS
	if (QT_BUILD)
		set(CMAKE_OSX_DEPLOYMENT_TARGET 10.14)
	else()
		set(CMAKE_OSX_DEPLOYMENT_TARGET 10.13)
	endif()
endif()

if (APPLE AND CMAKE_OSX_DEPLOYMENT_TARGET AND "${CMAKE_OSX_DEPLOYMENT_TARGET}" VERSION_LESS 10.14 AND NOT ${CMAKE_CXX_COMPILER_VERSION} VERSION_LESS 9)
	# Older versions of the macOS stdlib don't have operator new(size_t, align_val_t)
	# Disable use of them with this flag
	# Not great, but also no worse that what we were getting before we turned on C++17
	add_compile_options(-fno-aligned-allocation)
endif()

# CMake defaults the suffix for modules to .so on macOS but wx tells us that the
# extension is .dylib (so that's what we search for)
if(APPLE)
	set(CMAKE_SHARED_MODULE_SUFFIX ".dylib")
endif()

if(CMAKE_SYSTEM_NAME MATCHES "Darwin")
	if(NOT OSX_USE_DEFAULT_SEARCH_PATH)
		# Hack up the path to prioritize the path to built-in OS libraries to
		# increase the chance of not depending on a bunch of copies of them
		# installed by MacPorts, Fink, Homebrew, etc, and ending up copying
		# them into the bundle.  Since we depend on libraries which are not
		# part of OS X (wx, etc.), however, don't remove the default path
		# entirely.  This is still kinda evil, since it defeats the user's
		# path settings...
		# See http://www.cmake.org/cmake/help/v3.0/command/find_program.html
		list(APPEND CMAKE_PREFIX_PATH "/usr")
	endif()

	add_link_options(-Wl,-dead_strip,-dead_strip_dylibs)
endif()