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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 14 | pmbaty | 1 | # The macro choose_msvc_crt() takes a list of possible |
| 2 | # C runtimes to choose from, in the form of compiler flags, |
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| 3 | # to present to the user. (MTd for /MTd, etc) |
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| 4 | # |
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| 5 | # The macro is invoked at the end of the file. |
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| 6 | # |
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| 7 | # CMake already sets CRT flags in the CMAKE_CXX_FLAGS_* and |
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| 8 | # CMAKE_C_FLAGS_* variables by default. To let the user |
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| 9 | # override that for each build type: |
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| 10 | # 1. Detect which CRT is already selected, and reflect this in |
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| 11 | # LLVM_USE_CRT_* so the user can have a better idea of what |
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| 12 | # changes they're making. |
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| 13 | # 2. Replace the flags in both variables with the new flag via a regex. |
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| 14 | # 3. set() the variables back into the cache so the changes |
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| 15 | # are user-visible. |
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| 16 | |||
| 17 | ### Helper macros: ### |
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| 18 | macro(make_crt_regex regex crts) |
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| 19 | set(${regex} "") |
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| 20 | foreach(crt ${${crts}}) |
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| 21 | # Trying to match the beginning or end of the string with stuff |
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| 22 | # like [ ^]+ didn't work, so use a bunch of parentheses instead. |
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| 23 | set(${regex} "${${regex}}|(^| +)/${crt}($| +)") |
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| 24 | endforeach(crt) |
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| 25 | string(REGEX REPLACE "^\\|" "" ${regex} "${${regex}}") |
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| 26 | endmacro(make_crt_regex) |
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| 27 | |||
| 28 | macro(get_current_crt crt_current regex flagsvar) |
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| 29 | # Find the selected-by-CMake CRT for each build type, if any. |
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| 30 | # Strip off the leading slash and any whitespace. |
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| 31 | string(REGEX MATCH "${${regex}}" ${crt_current} "${${flagsvar}}") |
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| 32 | string(REPLACE "/" " " ${crt_current} "${${crt_current}}") |
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| 33 | string(STRIP "${${crt_current}}" ${crt_current}) |
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| 34 | endmacro(get_current_crt) |
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| 35 | |||
| 36 | # Replaces or adds a flag to a variable. |
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| 37 | # Expects 'flag' to be padded with spaces. |
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| 38 | macro(set_flag_in_var flagsvar regex flag) |
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| 39 | string(REGEX MATCH "${${regex}}" current_flag "${${flagsvar}}") |
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| 40 | if("${current_flag}" STREQUAL "") |
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| 41 | set(${flagsvar} "${${flagsvar}}${${flag}}") |
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| 42 | else() |
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| 43 | string(REGEX REPLACE "${${regex}}" "${${flag}}" ${flagsvar} "${${flagsvar}}") |
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| 44 | endif() |
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| 45 | string(STRIP "${${flagsvar}}" ${flagsvar}) |
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| 46 | # Make sure this change gets reflected in the cache/gui. |
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| 47 | # CMake requires the docstring parameter whenever set() touches the cache, |
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| 48 | # so get the existing docstring and re-use that. |
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| 49 | get_property(flagsvar_docs CACHE ${flagsvar} PROPERTY HELPSTRING) |
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| 50 | set(${flagsvar} "${${flagsvar}}" CACHE STRING "${flagsvar_docs}" FORCE) |
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| 51 | endmacro(set_flag_in_var) |
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| 52 | |||
| 53 | |||
| 54 | macro(choose_msvc_crt MSVC_CRT) |
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| 55 | if(LLVM_USE_CRT) |
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| 56 | message(FATAL_ERROR |
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| 57 | "LLVM_USE_CRT is deprecated. Use the CMAKE_BUILD_TYPE-specific |
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| 58 | variables (LLVM_USE_CRT_DEBUG, etc) instead.") |
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| 59 | endif() |
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| 60 | |||
| 61 | make_crt_regex(MSVC_CRT_REGEX ${MSVC_CRT}) |
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| 62 | |||
| 63 | foreach(build_type ${CMAKE_CONFIGURATION_TYPES} ${CMAKE_BUILD_TYPE}) |
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| 64 | string(TOUPPER "${build_type}" build) |
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| 65 | if (NOT LLVM_USE_CRT_${build}) |
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| 66 | get_current_crt(LLVM_USE_CRT_${build} |
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| 67 | MSVC_CRT_REGEX |
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| 68 | CMAKE_CXX_FLAGS_${build}) |
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| 69 | set(LLVM_USE_CRT_${build} |
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| 70 | "${LLVM_USE_CRT_${build}}" |
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| 71 | CACHE STRING "Specify VC++ CRT to use for ${build_type} configurations." |
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| 72 | FORCE) |
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| 73 | set_property(CACHE LLVM_USE_CRT_${build} |
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| 74 | PROPERTY STRINGS ;${${MSVC_CRT}}) |
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| 75 | endif(NOT LLVM_USE_CRT_${build}) |
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| 76 | endforeach(build_type) |
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| 77 | |||
| 78 | foreach(build_type ${CMAKE_CONFIGURATION_TYPES} ${CMAKE_BUILD_TYPE}) |
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| 79 | string(TOUPPER "${build_type}" build) |
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| 80 | if ("${LLVM_USE_CRT_${build}}" STREQUAL "") |
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| 81 | set(flag_string " ") |
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| 82 | else() |
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| 83 | set(flag_string " /${LLVM_USE_CRT_${build}} ") |
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| 84 | if (NOT ${LLVM_USE_CRT_${build}} IN_LIST ${MSVC_CRT}) |
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| 85 | message(FATAL_ERROR |
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| 86 | "Invalid value for LLVM_USE_CRT_${build}: ${LLVM_USE_CRT_${build}}. Valid options are one of: ${${MSVC_CRT}}") |
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| 87 | endif() |
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| 88 | message(STATUS "Using ${build_type} VC++ CRT: ${LLVM_USE_CRT_${build}}") |
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| 89 | endif() |
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| 90 | foreach(lang C CXX) |
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| 91 | set_flag_in_var(CMAKE_${lang}_FLAGS_${build} MSVC_CRT_REGEX flag_string) |
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| 92 | endforeach(lang) |
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| 93 | endforeach(build_type) |
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| 94 | endmacro(choose_msvc_crt MSVC_CRT) |
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| 95 | |||
| 96 | |||
| 97 | # List of valid CRTs for MSVC |
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| 98 | set(MSVC_CRT |
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| 99 | MD |
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| 100 | MDd |
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| 101 | MT |
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| 102 | MTd) |
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| 103 | |||
| 104 | choose_msvc_crt(MSVC_CRT) |
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| 105 |