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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)
If (NOT DEFINED VISIBILITY_HIDDEN)
Set(VISIBILITY_HIDDEN "")
If (NOT MINGW AND NOT APPLE)
CHECK_CXX_ACCEPTS_FLAG(-fvisibility=hidden HAS_VISIBILITY_HIDDEN)
If (HAS_VISIBILITY_HIDDEN)
Set(VISIBILITY_HIDDEN "-fvisibility=hidden")
EndIf (HAS_VISIBILITY_HIDDEN)
EndIf (NOT MINGW AND NOT APPLE)
EndIf (NOT DEFINED VISIBILITY_HIDDEN)
If (NOT DEFINED VISIBILITY_INLINES_HIDDEN)
Set(VISIBILITY_INLINES_HIDDEN "")
If (NOT MINGW)
CHECK_CXX_ACCEPTS_FLAG(-fvisibility-inlines-hidden HAS_VISIBILITY_INLINES_HIDDEN)
If (HAS_VISIBILITY_INLINES_HIDDEN)
Set(VISIBILITY_INLINES_HIDDEN "-fvisibility-inlines-hidden")
EndIf (HAS_VISIBILITY_INLINES_HIDDEN)
EndIf (NOT MINGW)
EndIf (NOT DEFINED VISIBILITY_INLINES_HIDDEN)
If (NOT DEFINED SSE_FLAGS)
CHECK_CXX_ACCEPTS_FLAG("-msse -mfpmath=sse" HAS_SSE_FLAGS)
If (HAS_SSE_FLAGS)
Set(SSE_FLAGS "-msse -mfpmath=sse")
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 (NOT DEFINED SSE_FLAGS)
If (NOT DEFINED IEEE_FP_FLAG)
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 (NOT DEFINED IEEE_FP_FLAG)
If (NOT DEFINED LTO_FLAGS)
Set(LTO_FLAGS "")
Set(LTO FALSE CACHE BOOL "Link Time Optimizations (LTO)")
If (LTO)
CHECK_CXX_ACCEPTS_FLAG("-flto" HAS_LTO_FLAG)
If (HAS_LTO_FLAG)
Set(LTO_FLAGS "${LTO_FLAGS} -flto")
Else (HAS_LTO_FLAG)
Set(LTO_FLAGS "${LTO_FLAGS} -flto")
EndIf (HAS_LTO_FLAG)
EndIf (LTO)
Set(LTO_WHOPR FALSE CACHE BOOL "Link Time Optimizations (LTO) - Whole program optimizer (WHOPR)")
If (LTO_WHOPR)
CHECK_CXX_ACCEPTS_FLAG("-fwhopr" HAS_LTO_WHOPR_FLAG)
If (HAS_LTO_WHOPR_FLAG)
Set(LTO_FLAGS "${LTO_FLAGS} -fwhopr")
EndIf (HAS_LTO_WHOPR_FLAG)
EndIf (LTO_WHOPR)
If (LTO AND LTO_WHOPR)
Message( FATAL_ERROR "LTO and LTO_WHOPR are mutually exclusive, please enable only one at a time." )
EndIf (LTO AND LTO_WHOPR)
EndIf (NOT DEFINED LTO_FLAGS)
IF (NOT DEFINED MARCH)
CHECK_CXX_ACCEPTS_FLAG("-march=i686" HAS_I686_FLAG_)
IF (HAS_I686_FLAG_)
Set(MARCH "i686")
Else (HAS_I686_FLAG_)
Message(INFO "-march=i686 flag not accepted")
Set(MARCH "")
EndIf (HAS_I686_FLAG_)
EndIf (NOT DEFINED MARCH)
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