#
 #             ORXONOX - the hottest 3D action shooter ever to exist
 #                             > www.orxonox.net <
 #
 #        This program is free software; you can redistribute it and/or
 #         modify it under the terms of the GNU General Public License
 #        as published by the Free Software Foundation; either version 2
 #            of the License, or (at your option) any later version.
 #
 #       This program is distributed in the hope that it will be useful,
 #        but WITHOUT ANY WARRANTY; without even the implied warranty of
 #        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 #                 GNU General Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License along
 #      with this program; if not, write to the Free Software Foundation,
 #     Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #
 #
 #  Author:
 #    Reto Grieder
 #  Description:
 #    Sets the right compiler and linker flags for the Microsoft Compiler.
 #

INCLUDE(FlagUtilities)

################### Compiler Version ####################

# We make use of variadic macros, which is only supported by MSVC 8 and above
IF(MSVC_VERSION LESS 1400)
  MESSAGE(FATAL_ERROR "Microsoft Visual Studio versions below 8 (2005) are not supported because of missing compiler extensions.")
ENDIF()


######################## Options ########################

# Orxonox only supports MSVC 8 and above, which gets asserted above
SET(PCH_COMPILER_SUPPORT TRUE)


#################### Compiler Flags #####################

# -MD    Minimal Rebuild
# -RTC1  Both basic runtime checks
# -MD[d] Multithreaded [debug] DLL
# -Zi    Program Database
# -ZI    Program Database for Edit & Continue
# -WX    General warning Level X
# -wdX   Disable specific warning X
# -wnX   Set warning level of specific warning X to level n

# Only add (not set) some general compiler flags.
# CMake default flags : -DWIN32 -D_WINDOWS -W3 -Zm1000
# additionally for CXX: -EHsc -GR
# -MP is for multiprocessed compiling
ADD_COMPILER_FLAGS("-D__WIN32__ -D_WIN32 -MP"  CACHE)
ADD_COMPILER_FLAGS("-D_CRT_SECURE_NO_WARNINGS" CACHE)
ADD_COMPILER_FLAGS("-D_SCL_SECURE_NO_WARNINGS" CACHE)

# Overwrite CMake default flags here for the individual configurations
SET_COMPILER_FLAGS("-MDd -Od -Oi -Zi -D_DEBUG -RTC1" Debug          CACHE)
SET_COMPILER_FLAGS("-MD  -O2         -DNDEBUG"       Release        CACHE)
SET_COMPILER_FLAGS("-MD  -O2     -Zi -DNDEBUG"       RelWithDebInfo CACHE)
SET_COMPILER_FLAGS("-MD  -O1         -DNDEBUG"       MinSizeRel     CACHE)

# Enable non standard floating point optimisations
ADD_COMPILER_FLAGS("-fp:fast" CACHE)

# Use Link time code generation for Release config if ORXONOX_RELEASE is defined
IF(ORXONOX_RELEASE)
  ADD_COMPILER_FLAGS("-GL" ReleaseAll CACHE)
ENDIF()


####################### Warnings ########################

# Increase warning level if requested
IF(EXTRA_COMPILER_WARNINGS)
  REMOVE_COMPILER_FLAGS("-W1 -W2 -W3" CACHE)
  ADD_COMPILER_FLAGS   ("-W4" CACHE)
ELSE()
  REMOVE_COMPILER_FLAGS("-W1 -W2 -W4" CACHE)
  ADD_COMPILER_FLAGS   ("-W3" CACHE)
ENDIF()

# "<type> needs to have dll-interface to be used by clients'
# Happens on STL member variables which are not public
ADD_COMPILER_FLAGS("-w44251" CACHE)
ADD_COMPILER_FLAGS("-w44275" CACHE) # For inheritance

# Multiple assignment operators specified
ADD_COMPILER_FLAGS("-w44522" CACHE)

# Forcing values to bool
ADD_COMPILER_FLAGS("-w44800" CACHE)

# TODO: Resolve the cause of this warning!
# ('class1' : inherits 'class2::member' via dominance)
ADD_COMPILER_FLAGS("-w44250" CACHE)

# This warns about truncation to 255 characters in debug/browse info
# ADD_COMPILER_FLAGS("-w44786 -w44503" CACHE)

# conversion from 'double' to 'float', possible loss of data
# conversion from 'ogg_int64_t' to 'long', possible loss of data
# ADD_COMPILER_FLAGS("-w44244" CACHE)

# "conversion from 'size_t' to 'unsigned int', possible loss of data
# ADD_COMPILER_FLAGS("-w44267" CACHE)

# "truncation from 'double' to 'float'
# ADD_COMPILER_FLAGS("-w44305" CACHE)

# "non dll-interface class used as base for dll-interface class"
# ADD_COMPILER_FLAGS("-w44275" CACHE)

# "C++ Exception Specification ignored"
# This is because MSVC 6 did not implement all the C++ exception
# specifications in the ANSI C++ draft.
# ADD_COMPILER_FLAGS("-w44290" CACHE)

# "no suitable definition provided for explicit template
# instantiation request" Occurs in VC7 for no justifiable reason.
# ADD_COMPILER_FLAGS("-w44661" CACHE)

# Deprecation warnings when using CRT calls in VC8
# These show up on all C runtime lib code in VC8, disable since they clutter
# the warnings with things we may not be able to do anything about (e.g.
# generated code from nvparse etc). I doubt very much that these calls
# will ever be actually removed from VC anyway, it would break too much code.
# Note: Probably handled by "-DCRT_SECURE_NO_WARNINGS"
# ADD_COMPILER_FLAGS("-w44996" CACHE)

# "conditional expression constant"
# ADD_COMPILER_FLAGS("-w4201" CACHE)


##################### Linker Flags ######################

# CMake default flags: -MANIFEST -STACK:10000000 -machine:I386
# and INCREMENTAL and DEBUG for debug versions
SET_LINKER_FLAGS("-debug -INCREMENTAL:YES" Debug              CACHE)
SET_LINKER_FLAGS("-debug"                  RelWithDebInfo     CACHE)
SET_LINKER_FLAGS(""                        Release MinSizeRel CACHE)

ADD_LINKER_FLAGS("-OPT:NOWIN98" MSVC80 CACHE)

# Use Link time code generation for Release config if ORXONOX_RELEASE is defined
IF(ORXONOX_RELEASE)
  ADD_LINKER_FLAGS("-INCREMENTAL:NO -OPT:ICF -OPT:REF -LTCG" ReleaseAll   CACHE)
  # Static linker flags have to be added manually to a target
  SET(ORXONOX_STATIC_LINKER_FLAGS "/LTCG")
ELSE()
  ADD_LINKER_FLAGS("-INCREMENTAL:YES"                  RelWithDebInfo     CACHE)
  ADD_LINKER_FLAGS("-INCREMENTAL:NO -OPT:ICF -OPT:REF" Release MinSizeRel CACHE)
ENDIF()