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[CMake] Default options for faster executables on MSVC
Differential Revision: https://reviews.llvm.org/D55056 llvm-svn: 361826
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@ -435,6 +435,10 @@ option(LLVM_ENABLE_LLD "Use lld as C and C++ linker." OFF)
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option(LLVM_ENABLE_PEDANTIC "Compile with pedantic enabled." ON)
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option(LLVM_ENABLE_WERROR "Fail and stop if a warning is triggered." OFF)
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if (MSVC)
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option(LLVM_ENABLE_INCREMENTAL_LINK "Link incrementally. Enabling it might produce slower executables." OFF)
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endif()
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option(LLVM_ENABLE_DUMP "Enable dump functions even when assertions are disabled" OFF)
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if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" )
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@ -50,6 +50,17 @@ macro(set_flag_in_var flagsvar regex flag)
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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(disable_MT_if_LLDB build message)
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if (LLVM_TOOL_LLDB_BUILD)
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if ((NOT ${build} STREQUAL "DEBUG") AND (LLVM_USE_CRT_${build} STREQUAL "MT"))
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if (LLVM_TOOL_CLANG_BUILD OR LLVM_TOOL_LLD_BUILD)
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set(performance " This might impact runtime performance for Clang or LLD. Preferably build them separately.")
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endif()
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message(WARNING "${message}.${performance}")
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set(LLVM_USE_CRT_${build} "MD")
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endif()
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endif()
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endmacro(disable_MT_if_LLDB)
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macro(choose_msvc_crt MSVC_CRT)
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if(LLVM_USE_CRT)
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@ -66,13 +77,26 @@ variables (LLVM_USE_CRT_DEBUG, etc) instead.")
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get_current_crt(LLVM_USE_CRT_${build}
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MSVC_CRT_REGEX
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CMAKE_CXX_FLAGS_${build})
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# Make /MT the default in Release builds to make them faster
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# and avoid the DLL function thunking.
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if ((${build} STREQUAL "MINSIZEREL") OR
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(${build} STREQUAL "RELEASE") OR
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(${build} STREQUAL "RELWITHDEBINFO"))
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set(LLVM_USE_CRT_${build} "MT")
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endif()
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disable_MT_if_LLDB(${build} "Using /MD as required by LLDB")
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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_${build})
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else()
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disable_MT_if_LLDB(${build} "Disabling /MT as required by LLDB")
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endif()
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endforeach(build_type)
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foreach(build_type ${CMAKE_CONFIGURATION_TYPES} ${CMAKE_BUILD_TYPE})
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@ -418,6 +418,14 @@ if( MSVC )
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# "Enforce type conversion rules".
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append("/Zc:rvalueCast" CMAKE_CXX_FLAGS)
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if (CMAKE_CXX_COMPILER_ID MATCHES "MSVC" AND NOT LLVM_ENABLE_INCREMENTAL_LINK)
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foreach(CONFIG RELEASE RELWITHDEBINFO MINSIZEREL)
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foreach(FLAG EXE MODULE SHARED STATIC)
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string(REGEX REPLACE "[-/](INCREMENTAL:YES|INCREMENTAL:NO|INCREMENTAL)" "/INCREMENTAL:NO" CMAKE_${FLAG}_LINKER_FLAGS_${CONFIG} "${CMAKE_${FLAG}_LINKER_FLAGS_${CONFIG}}")
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endforeach()
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endforeach()
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endif()
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if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND NOT LLVM_ENABLE_LTO)
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# clang-cl and cl by default produce non-deterministic binaries because
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# link.exe /incremental requires a timestamp in the .obj file. clang-cl
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