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