forked from OSchip/llvm-project
107 lines
3.8 KiB
CMake
107 lines
3.8 KiB
CMake
# The macro choose_msvc_crt() takes a list of possible
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# C runtimes to choose from, in the form of compiler flags,
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# to present to the user. (MTd for /MTd, etc)
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#
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# The macro is invoked at the end of the file.
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#
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# CMake already sets CRT flags in the CMAKE_CXX_FLAGS_* and
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# CMAKE_C_FLAGS_* variables by default. To let the user
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# override that for each build type:
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# 1. Detect which CRT is already selected, and reflect this in
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# LLVM_USE_CRT_* so the user can have a better idea of what
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# changes they're making.
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# 2. Replace the flags in both variables with the new flag via a regex.
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# 3. set() the variables back into the cache so the changes
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# are user-visible.
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### Helper macros: ###
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macro(make_crt_regex regex crts)
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set(${regex} "")
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foreach(crt ${${crts}})
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# Trying to match the beginning or end of the string with stuff
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# like [ ^]+ didn't work, so use a bunch of parentheses instead.
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set(${regex} "${${regex}}|(^| +)/${crt}($| +)")
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endforeach(crt)
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string(REGEX REPLACE "^\\|" "" ${regex} "${${regex}}")
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endmacro(make_crt_regex)
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macro(get_current_crt crt_current regex flagsvar)
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# Find the selected-by-CMake CRT for each build type, if any.
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# Strip off the leading slash and any whitespace.
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string(REGEX MATCH "${${regex}}" ${crt_current} "${${flagsvar}}")
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string(REPLACE "/" " " ${crt_current} "${${crt_current}}")
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string(STRIP "${${crt_current}}" ${crt_current})
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endmacro(get_current_crt)
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# Replaces or adds a flag to a variable.
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# Expects 'flag' to be padded with spaces.
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macro(set_flag_in_var flagsvar regex flag)
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string(REGEX MATCH "${${regex}}" current_flag "${${flagsvar}}")
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if("${current_flag}" STREQUAL "")
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set(${flagsvar} "${${flagsvar}}${${flag}}")
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else()
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string(REGEX REPLACE "${${regex}}" "${${flag}}" ${flagsvar} "${${flagsvar}}")
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endif()
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string(STRIP "${${flagsvar}}" ${flagsvar})
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# Make sure this change gets reflected in the cache/gui.
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# CMake requires the docstring parameter whenever set() touches the cache,
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# so get the existing docstring and re-use that.
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get_property(flagsvar_docs CACHE ${flagsvar} PROPERTY HELPSTRING)
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set(${flagsvar} "${${flagsvar}}" CACHE STRING "${flagsvar_docs}" FORCE)
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endmacro(set_flag_in_var)
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macro(choose_msvc_crt MSVC_CRT)
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if(LLVM_USE_CRT)
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message(FATAL_ERROR
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"LLVM_USE_CRT is deprecated. Use the CMAKE_BUILD_TYPE-specific
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variables (LLVM_USE_CRT_DEBUG, etc) instead.")
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endif()
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make_crt_regex(MSVC_CRT_REGEX ${MSVC_CRT})
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foreach(build_type ${CMAKE_CONFIGURATION_TYPES} ${CMAKE_BUILD_TYPE})
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string(TOUPPER "${build_type}" build)
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if (NOT LLVM_USE_CRT_${build})
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get_current_crt(LLVM_USE_CRT_${build}
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MSVC_CRT_REGEX
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CMAKE_CXX_FLAGS_${build})
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set(LLVM_USE_CRT_${build}
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"${LLVM_USE_CRT_${build}}"
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CACHE STRING "Specify VC++ CRT to use for ${build_type} configurations."
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FORCE)
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set_property(CACHE LLVM_USE_CRT_${build}
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PROPERTY STRINGS ;${${MSVC_CRT}})
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endif(NOT LLVM_USE_CRT_${build})
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endforeach(build_type)
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foreach(build_type ${CMAKE_CONFIGURATION_TYPES} ${CMAKE_BUILD_TYPE})
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string(TOUPPER "${build_type}" build)
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if ("${LLVM_USE_CRT_${build}}" STREQUAL "")
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set(flag_string " ")
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else()
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set(flag_string " /${LLVM_USE_CRT_${build}} ")
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list(FIND ${MSVC_CRT} ${LLVM_USE_CRT_${build}} idx)
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if (idx LESS 0)
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message(FATAL_ERROR
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"Invalid value for LLVM_USE_CRT_${build}: ${LLVM_USE_CRT_${build}}. Valid options are one of: ${${MSVC_CRT}}")
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endif (idx LESS 0)
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message(STATUS "Using ${build_type} VC++ CRT: ${LLVM_USE_CRT_${build}}")
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endif()
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foreach(lang C CXX)
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set_flag_in_var(CMAKE_${lang}_FLAGS_${build} MSVC_CRT_REGEX flag_string)
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endforeach(lang)
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endforeach(build_type)
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endmacro(choose_msvc_crt MSVC_CRT)
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# List of valid CRTs for MSVC
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set(MSVC_CRT
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MD
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MDd
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MT
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MTd)
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choose_msvc_crt(MSVC_CRT)
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