# Core compile arguments used for the whole server
# TODO: This currently assumes libstdc++, later on we should *probably* set this with some detection
# to check the current c++ standard library (but we only will compile and run with libstdc++ anyways since libc++ is a bit lacking with even c++17, so..)
# also TODO: Use a list so that this isn't one giant line (list JOIN should help.)

set(LOBBYSERVER_CORE_COMPILE_ARGS "-Wall -Wformat=2 -Wimplicit-fallthrough -fstrict-flex-arrays=3 -fstack-clash-protection -fstack-protector-strong ")
set(LOBBYSERVER_CORE_LINKER_ARGS "-fuse-ld=${LOBBYSERVER_LINKER}")

if("${CMAKE_BUILD_TYPE}" STREQUAL "Release") # OR "${CMAKE_BUILD_TYPE}" STREQUAL "RelWithDebInfo"

set(LOBBYSERVER_CORE_COMPILE_ARGS "${LOBBYSERVER_CORE_COMPILE_ARGS} -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3")

# If on Release use link-time optimizations.
# On clang we use ThinLTO for even better build performance.
if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
	set(LOBBYSERVER_CORE_COMPILE_ARGS "${LOBBYSERVER_CORE_COMPILE_ARGS} -flto=thin")
	set(LOBBYSERVER_CORE_LINKER_ARGS "${LOBBYSERVER_CORE_LINKER_ARGS} -flto=thin")
else()
	set(LOBBYSERVER_CORE_COMPILE_ARGS "${LOBBYSERVER_CORE_COMPILE_ARGS} -flto")
	set(LOBBYSERVER_CORE_LINKER_ARGS "${LOBBYSERVER_CORE_LINKER_ARGS} -flto")
endif()

endif()

set(_LOBBYSERVER_CORE_WANTED_SANITIZERS "")

if("asan" IN_LIST LOBBYSERVER_BUILD_FEATURES)
	# Error if someone's trying to mix asan and tsan together,
	# they aren't compatible.
	if("tsan" IN_LIST LOBBYSERVER_BUILD_FEATURES)
		message(FATAL_ERROR "ASAN and TSAN cannot be used together.")
	endif()

	message(STATUS "Enabling ASAN because it was in LOBBYSERVER_BUILD_FEATURES")
	list(APPEND _LOBBYSERVER_CORE_WANTED_SANITIZERS "address")
endif()

if("tsan" IN_LIST LOBBYSERVER_BUILD_FEATURES)
	if("asan" IN_LIST LOBBYSERVER_BUILD_FEATURES)
		message(FATAL_ERROR "ASAN and TSAN cannot be used together.")
	endif()

	message(STATUS "Enabling TSAN because it was in LOBBYSERVER_BUILD_FEATURES")
	list(APPEND _LOBBYSERVER_CORE_WANTED_SANITIZERS "thread")
endif()

if("ubsan" IN_LIST LOBBYSERVER_BUILD_FEATURES)
	message(STATUS "Enabling UBSAN because it was in LOBBYSERVER_BUILD_FEATURES")
	list(APPEND _LOBBYSERVER_CORE_WANTED_SANITIZERS "undefined")
endif()

list(LENGTH _LOBBYSERVER_CORE_WANTED_SANITIZERS _LOBBYSERVER_CORE_WANTED_SANITIZERS_LENGTH)
if(NOT _LOBBYSERVER_CORE_WANTED_SANITIZERS_LENGTH  EQUAL 0)
	list(JOIN _LOBBYSERVER_CORE_WANTED_SANITIZERS "," _LOBBYSERVER_CORE_WANTED_SANITIZERS_ARG)
	message(STATUS "Enabled sanitizers: ${_LOBBYSERVER_CORE_WANTED_SANITIZERS_ARG}")
	set(LOBBYSERVER_CORE_COMPILE_ARGS "${LOBBYSERVER_CORE_COMPILE_ARGS} -fsanitize=${_COLLABVM_CORE_WANTED_SANITIZERS_ARG}")
	set(LOBBYSERVER_CORE_LINKER_ARGS "${LOBBYSERVER_CORE_LINKER_ARGS} -fsanitize=${_COLLABVM_CORE_WANTED_SANITIZERS_ARG}")
endif()

# Set core CMake toolchain variables so that they get applied to all projects.
# A bit nasty, but /shrug, this way our third party libraries can be mostly sanitized/etc as well.
# -g3 is temporary for release build deployment testing

set(CMAKE_C_FLAGS "${LOBBYSERVER_CORE_COMPILE_ARGS}")
set(CMAKE_CXX_FLAGS "${LOBBYSERVER_CORE_COMPILE_ARGS}")

set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS} -O0 -g3")
set(CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS} -O3 -g3")
set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS} -O3 -g3")

set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS} -O0 -g3")
set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS} -O3 -g3")
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS} -O3 -g3")

set(CMAKE_EXE_LINKER_FLAGS "${LOBBYSERVER_CORE_LINKER_ARGS} -Wl,-z,noexecstack,-z,relro,-z,now")