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# This file is part of the Spring engine (GPL v2 or later), see LICENSE.html
# - Test whether the C++ compiler supports certain flags.
# Once done, this will define the following vars.
# They will be empty if the flag is not supported,
# or contain the flag if it is supported.
#
# VISIBILITY_HIDDEN -fvisibility=hidden
# VISIBILITY_INLINES_HIDDEN -fvisibility-inlines-hidden
# SSE_FLAGS -msse -mfpmath=sse
# IEEE_FP_FLAG -fvisibility-inlines-hidden
# LTO_FLAGS -flto -fwhopr
#
# Note: gcc for windows supports these flags, but gives lots of errors when
# compiling, so use them only for linux builds.
Include(TestCXXAcceptsFlag)
# Helper
Macro (CHECK_AND_ADD_FLAGS dest)
FOREACH (flag ${ARGN})
CHECK_CXX_ACCEPTS_FLAG("${flag}" has_${flag})
if (has_${flag})
Set(${dest} "${${dest}} ${flag}")
else (has_${flag})
Message("compiler doesn't support: ${flag}")
endif (has_${flag})
ENDFOREACH (flag ${ARGN})
EndMacro (CHECK_AND_ADD_FLAGS)
If (NOT DEFINED VISIBILITY_HIDDEN)
Set(VISIBILITY_HIDDEN "")
If (NOT WIN32 AND NOT APPLE)
CHECK_AND_ADD_FLAGS(VISIBILITY_HIDDEN -fvisibility=hidden)
EndIf (NOT WIN32 AND NOT APPLE)
EndIf (NOT DEFINED VISIBILITY_HIDDEN)
If (NOT DEFINED VISIBILITY_INLINES_HIDDEN)
Set(VISIBILITY_INLINES_HIDDEN "")
If (NOT WIN32)
CHECK_AND_ADD_FLAGS(VISIBILITY_INLINES_HIDDEN -fvisibility-inlines-hidden)
EndIf (NOT WIN32)
EndIf (NOT DEFINED VISIBILITY_INLINES_HIDDEN)
If (NOT DEFINED SSE_FLAGS)
If (MSVC)
#Set(SSE_FLAGS "/arch:SSE2")
Else (MSVC)
CHECK_CXX_ACCEPTS_FLAG("-msse -mfpmath=sse" HAS_SSE_FLAGS)
If (HAS_SSE_FLAGS)
# activate SSE1 only
Set(SSE_FLAGS "-msse -mfpmath=sse")
#Set(SSE_FLAGS "${SSE_FLAGS} -mmmx")
# worth to test if sync
#Set(SSE_FLAGS "${SSE_FLAGS} -mpopcnt -mlzcnt -mabm")
# disable rest
#Set(SSE_FLAGS "${SSE_FLAGS} -mno-3dnow") tests showed it might sync
CHECK_AND_ADD_FLAGS(SSE_FLAGS -mno-sse2 -mno-sse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -mno-sse4 -mno-sse4a)
CHECK_AND_ADD_FLAGS(SSE_FLAGS -mno-avx -mno-fma -mno-fma4 -mno-xop -mno-lwp)
CHECK_AND_ADD_FLAGS(SSE_FLAGS -mno-avx2)
Else (HAS_SSE_FLAGS)
Set(SSE_FLAGS "-DDEDICATED_NOSSE")
Message(WARNING "SSE1 support is missing, online play is highly discouraged with this build")
EndIf (HAS_SSE_FLAGS)
Endif (MSVC)
EndIf (NOT DEFINED SSE_FLAGS)
If (NOT DEFINED IEEE_FP_FLAG)
If (MSVC)
Set(IEEE_FP_FLAG "/fp:strict")
elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
Message(WARNING "Clang detected, disabled IEEE-FP")
Else (MSVC)
CHECK_CXX_ACCEPTS_FLAG("-mieee-fp" HAS_IEEE_FP_FLAG)
If (HAS_IEEE_FP_FLAG)
Set(IEEE_FP_FLAG "-mieee-fp")
Else (HAS_IEEE_FP_FLAG)
Message(WARNING "IEEE-FP support is missing, online play is highly discouraged with this build")
Set(IEEE_FP_FLAG "")
EndIf (HAS_IEEE_FP_FLAG)
Endif(MSVC)
EndIf (NOT DEFINED IEEE_FP_FLAG)
If (NOT DEFINED CXX11_FLAGS)
If (MSVC)
# Nothing needed
Set(CXX11_FLAGS "")
ElseIf ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
CHECK_AND_ADD_FLAGS(CXX11_FLAGS "-std=c++11")
Else (MSVC)
CHECK_AND_ADD_FLAGS(CXX11_FLAGS "-std=gnu++11")
If (NOT CXX11_FLAGS)
CHECK_AND_ADD_FLAGS(CXX11_FLAGS "-std=gnu++0x")
EndIf (NOT CXX11_FLAGS)
If (NOT CXX11_FLAGS)
# xcode
CHECK_AND_ADD_FLAGS(CXX11_FLAGS "-std=c++11")
EndIf (NOT CXX11_FLAGS)
If (NOT CXX11_FLAGS)
# xcode 2
CHECK_AND_ADD_FLAGS(CXX11_FLAGS "-std=c++0x")
EndIf (NOT CXX11_FLAGS)
If (NOT CXX11_FLAGS)
Message(WARNING "C++11 support missing")
EndIf (NOT CXX11_FLAGS)
Endif(MSVC)
EndIf (NOT DEFINED CXX11_FLAGS)
If (NOT MSVC AND NOT DEFINED LTO_FLAGS)
Set(LTO_FLAGS "")
Set(LTO FALSE CACHE BOOL "Link Time Optimizations (LTO)")
If (LTO)
CHECK_AND_ADD_FLAGS(LTO_FLAGS -flto)
if (NOT LTO_FLAGS)
Message(WARNING "Tried to enable LTO, but compiler doesn't support it!")
endif (NOT LTO_FLAGS)
EndIf (LTO)
EndIf (NOT MSVC AND NOT DEFINED LTO_FLAGS)
IF (NOT MSVC AND NOT DEFINED MARCH)
Set(MARCH "")
# 32bit
CHECK_CXX_ACCEPTS_FLAG("-march=i686" HAS_I686_FLAG_)
IF (HAS_I686_FLAG_)
Set(MARCH "i686")
EndIf (HAS_I686_FLAG_)
# 64bit
if ((CMAKE_SIZEOF_VOID_P EQUAL 8) AND (NOT MARCH))
# always syncs with 32bit
CHECK_CXX_ACCEPTS_FLAG("-march=x86_64" HAS_X86_64_FLAG_)
IF (HAS_X86_64_FLAG_)
Set(MARCH "x86_64")
EndIf (HAS_X86_64_FLAG_)
endif ((CMAKE_SIZEOF_VOID_P EQUAL 8) AND (NOT MARCH))
EndIf (NOT MSVC AND NOT DEFINED MARCH)
if (NOT MSVC)
if(NOT "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
CHECK_CXX_ACCEPTS_FLAG("-mno-tls-direct-seg-refs" HAS_NO_TLS_DIRECT_SEG_REFS_FLAG)
if (HAS_NO_TLS_DIRECT_SEG_REFS_FLAG)
set(NO_TLS_DIRECT_SEG_REFS -mno-tls-direct-seg-refs)
endif()
endif()
endif()
if (CMAKE_COMPILER_IS_GNUCXX)
# check if default linker is ld.gold
execute_process(COMMAND ${CMAKE_LINKER} "-v" COMMAND "grep" "-iq" "gold" RESULT_VARIABLE hasGold)
if (NOT hasGold EQUAL 0)
# since gcc 4.8 it is possible to switch the linker via that argument
CHECK_CXX_ACCEPTS_FLAG("-fuse-ld=gold" HAS_USE_LD)
IF (HAS_USE_LD)
FIND_PROGRAM(LD_GOLD ld.gold)
if (LD_GOLD)
set(hasGold 0)
set(LDGOLD_CXX_FLAGS "-fuse-ld=gold")
endif (LD_GOLD)
EndIf (HAS_USE_LD)
endif (NOT hasGold EQUAL 0)
if (hasGold EQUAL 0)
set(LDGOLD_FOUND TRUE)
set(LDGOLD_LINKER_FLAGS " -Wl,--compress-debug-sections=zlib")
endif (hasGold EQUAL 0)
mark_as_advanced(LDGOLD_FOUND LDGOLD_LINKER_FLAGS LDGOLD_CXX_FLAGS)
endif(CMAKE_COMPILER_IS_GNUCXX)
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