Blame cmake/MSVCRuntime.cmake

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macro(configure_msvc_runtime)
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	if(MSVC)
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		# Default to statically-linked runtime.
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		if("${MSVC_RUNTIME}" STREQUAL "")
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			set(MSVC_RUNTIME "dynamic")
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		endif()
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		# Set compiler options.
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		set(variables
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			CMAKE_C_FLAGS
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			CMAKE_C_FLAGS_DEBUG
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			CMAKE_C_FLAGS_MINSIZEREL
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			CMAKE_C_FLAGS_RELEASE
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			CMAKE_C_FLAGS_RELWITHDEBINFO
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			CMAKE_CXX_FLAGS
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			CMAKE_CXX_FLAGS_DEBUG
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			CMAKE_CXX_FLAGS_MINSIZEREL
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			CMAKE_CXX_FLAGS_RELEASE
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			CMAKE_CXX_FLAGS_RELWITHDEBINFO)
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		if(${MSVC_RUNTIME} STREQUAL "static")
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			message(STATUS "MSVC: using statically-linked runtime (/MT and /MTd).")
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			foreach(variable ${variables})
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				if(${variable} MATCHES "/MD")
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					string(REGEX REPLACE "/MD" "/MT" ${variable} "${${variable}}")
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				endif()
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			endforeach()
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		else()
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			message(STATUS "MSVC: using dynamically-linked runtime (/MD and /MDd).")
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			foreach(variable ${variables})
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				if(${variable} MATCHES "/MT")
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					string(REGEX REPLACE "/MT" "/MD" ${variable} "${${variable}}")
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				endif()
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			endforeach()
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		endif()
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		foreach(variable ${variables})
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			if(${variable} MATCHES "/Ob0")
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				string(REGEX REPLACE "/Ob0" "/Ob2" ${variable} "${${variable}}")
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			endif()
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		endforeach()
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		foreach(variable ${variables})
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			if(${variable} MATCHES "/W3")
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				string(REGEX REPLACE "/W3" "/W2" ${variable} "${${variable}}")
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			endif()
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		endforeach()
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		set(CMAKE_CXX_FLAGS "${CMAKE_C_FLAGS}")
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		set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG}")
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		set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE}")
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		set(CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_C_FLAGS_MINSIZEREL}")
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		set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO}")
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		foreach(variable ${variables})
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			set(${variable} "${${variable}}" CACHE STRING "MSVC_${variable}" FORCE)
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		endforeach()
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	endif()
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endmacro(configure_msvc_runtime)