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SetupCxxFlags.cmake
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SetupCxxFlags.cmake
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# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
# Check if the target architecture and compiler supports some special
# instruction sets that would boost performance.
include(CheckCXXCompilerFlag)
# x86/amd64 compiler flags
check_cxx_compiler_flag("-msse4.2" CXX_SUPPORTS_SSE4_2)
# power compiler flags
check_cxx_compiler_flag("-maltivec" CXX_SUPPORTS_ALTIVEC)
# Arm64 compiler flags
check_cxx_compiler_flag("-march=armv8-a+crc" CXX_SUPPORTS_ARMCRC)
check_cxx_compiler_flag("-march=armv8-a+crc+crypto" CXX_SUPPORTS_ARMV8_CRC_CRYPTO)
# Support C11
set(CMAKE_C_STANDARD 11)
# This ensures that things like gnu++11 get passed correctly
set(CMAKE_CXX_STANDARD 11)
# We require a C++11 compliant compiler
set(CMAKE_CXX_STANDARD_REQUIRED ON)
# Build with -fPIC so that can static link our libraries into other people's
# shared libraries
set(CMAKE_POSITION_INDEPENDENT_CODE ON)
string(TOUPPER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE)
# compiler flags that are common across debug/release builds
if(WIN32)
# TODO(wesm): Change usages of C runtime functions that MSVC says are
# insecure, like std::getenv
add_definitions(-D_CRT_SECURE_NO_WARNINGS)
if(MSVC)
# ARROW-1931 See https://github.com/google/googletest/issues/1318
#
# This is added to CMAKE_CXX_FLAGS instead of CXX_COMMON_FLAGS since only the
# former is passed into the external projects
if(MSVC_VERSION VERSION_GREATER 1900)
set(CMAKE_CXX_FLAGS
"${CMAKE_CXX_FLAGS} /D_SILENCE_TR1_NAMESPACE_DEPRECATION_WARNING")
endif()
if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
# clang-cl
set(CXX_COMMON_FLAGS "-EHsc")
elseif(${CMAKE_CXX_COMPILER_VERSION} VERSION_LESS 19)
message(FATAL_ERROR "Only MSVC 2015 (Version 19.0) and later are supported
by Arrow. Found version ${CMAKE_CXX_COMPILER_VERSION}.")
else()
# Fix annoying D9025 warning
string(REPLACE "/W3" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
# Set desired warning level (e.g. set /W4 for more warnings)
#
# ARROW-2986: Without /EHsc we get C4530 warning
set(CXX_COMMON_FLAGS "/W3 /EHsc")
endif()
if(ARROW_USE_STATIC_CRT)
foreach(c_flag
CMAKE_CXX_FLAGS
CMAKE_CXX_FLAGS_RELEASE
CMAKE_CXX_FLAGS_DEBUG
CMAKE_CXX_FLAGS_MINSIZEREL
CMAKE_CXX_FLAGS_RELWITHDEBINFO
CMAKE_C_FLAGS
CMAKE_C_FLAGS_RELEASE
CMAKE_C_FLAGS_DEBUG
CMAKE_C_FLAGS_MINSIZEREL
CMAKE_C_FLAGS_RELWITHDEBINFO)
string(REPLACE "/MD" "-MT" ${c_flag} "${${c_flag}}")
endforeach()
endif()
# Support large object code
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} /bigobj")
endif(MSVC)
else()
# Common flags set below with warning level
set(CXX_COMMON_FLAGS "")
endif()
# BUILD_WARNING_LEVEL add warning/error compiler flags. The possible values are
# - PRODUCTION: Build with `-Wall` but do not add `-Werror`, so warnings do not
# halt the build.
# - CHECKIN: Imply `-Weverything` with certain pedantic warnings
# disabled. `-Werror` is added in debug builds so that any warnings fail the
# build
# - EVERYTHING: Like `CHECKIN`, but possible extra flags depending on the
# compiler, including `-Wextra`, `-Weverything`, `-pedantic`.
# This is the most aggressive warning level.
# Defaults BUILD_WARNING_LEVEL to `CHECKIN`, unless CMAKE_BUILD_TYPE is
# `RELEASE`, then it will default to `PRODUCTION`. The goal of defaulting to
# `CHECKIN` is to avoid friction with long response time from CI.
if(NOT BUILD_WARNING_LEVEL)
if("${CMAKE_BUILD_TYPE}" STREQUAL "RELEASE")
set(BUILD_WARNING_LEVEL PRODUCTION)
else()
set(BUILD_WARNING_LEVEL CHECKIN)
endif()
endif(NOT BUILD_WARNING_LEVEL)
string(TOUPPER ${BUILD_WARNING_LEVEL} BUILD_WARNING_LEVEL)
message(STATUS "Arrow build warning level: ${BUILD_WARNING_LEVEL}")
macro(arrow_add_werror_if_debug)
if("${CMAKE_BUILD_TYPE}" STREQUAL "DEBUG")
# Treat all compiler warnings as errors
if("${COMPILER_FAMILY}" STREQUAL "msvc")
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} /WX")
else()
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} -Werror")
endif()
endif()
endmacro()
if("${BUILD_WARNING_LEVEL}" STREQUAL "CHECKIN")
# Pre-checkin builds
if("${COMPILER_FAMILY}" STREQUAL "msvc")
# https://docs.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warnings-by-compiler-version
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} /W3 /wd4365 /wd4267 /wd4838")
elseif("${COMPILER_FAMILY}" STREQUAL "clang")
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} -Weverything -Wdocumentation \
-Wno-c++98-compat \
-Wno-c++98-compat-pedantic -Wno-deprecated -Wno-weak-vtables -Wno-padded \
-Wno-comma -Wno-unused-macros -Wno-unused-parameter -Wno-unused-template -Wno-undef \
-Wno-shadow -Wno-switch-enum -Wno-exit-time-destructors \
-Wno-global-constructors -Wno-weak-template-vtables -Wno-undefined-reinterpret-cast \
-Wno-implicit-fallthrough -Wno-unreachable-code -Wno-unreachable-code-return \
-Wno-float-equal -Wno-missing-prototypes -Wno-documentation-unknown-command \
-Wno-old-style-cast -Wno-covered-switch-default \
-Wno-cast-align -Wno-vla-extension -Wno-shift-sign-overflow \
-Wno-used-but-marked-unused -Wno-missing-variable-declarations \
-Wno-gnu-zero-variadic-macro-arguments -Wno-conversion -Wno-sign-conversion \
-Wno-disabled-macro-expansion -Wno-format-nonliteral -Wno-missing-noreturn")
# Version numbers where warnings are introduced
if("${COMPILER_VERSION}" VERSION_GREATER "3.3")
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} -Wno-gnu-folding-constant")
endif()
if("${COMPILER_VERSION}" VERSION_GREATER "3.6")
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} -Wno-reserved-id-macro")
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} -Wno-range-loop-analysis")
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} -Wno-double-promotion")
endif()
if("${COMPILER_VERSION}" VERSION_GREATER "3.8")
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} -Wno-undefined-func-template")
endif()
if("${COMPILER_VERSION}" VERSION_GREATER "3.9")
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} -Wno-zero-as-null-pointer-constant")
endif()
if("${COMPILER_VERSION}" VERSION_GREATER "7.0")
# ARROW-6259: Flatbuffers generates code with superfluous semicolons, so
# we suppress this warning for now. See upstream bug report
# https://github.com/google/flatbuffers/issues/5482
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} -Wno-extra-semi-stmt \
-Wno-shadow-field -Wno-c++2a-compat")
endif()
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} -Wno-unknown-warning-option")
elseif("${COMPILER_FAMILY}" STREQUAL "gcc")
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} -Wall \
-Wno-conversion -Wno-sign-conversion -Wno-unused-variable")
else()
message(FATAL_ERROR "Unknown compiler. Version info:\n${COMPILER_VERSION_FULL}")
endif()
arrow_add_werror_if_debug()
elseif("${BUILD_WARNING_LEVEL}" STREQUAL "EVERYTHING")
# Pedantic builds for fixing warnings
if("${COMPILER_FAMILY}" STREQUAL "msvc")
string(REPLACE "/W3" "" CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS}")
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} /Wall")
# https://docs.microsoft.com/en-us/cpp/build/reference/compiler-option-warning-level
# /wdnnnn disables a warning where "nnnn" is a warning number
elseif("${COMPILER_FAMILY}" STREQUAL "clang")
set(CXX_COMMON_FLAGS
"${CXX_COMMON_FLAGS} -Weverything -Wno-c++98-compat -Wno-c++98-compat-pedantic")
elseif("${COMPILER_FAMILY}" STREQUAL "gcc")
set(CXX_COMMON_FLAGS
"${CXX_COMMON_FLAGS} -Wall -Wpedantic -Wextra -Wno-unused-parameter")
else()
message(FATAL_ERROR "Unknown compiler. Version info:\n${COMPILER_VERSION_FULL}")
endif()
arrow_add_werror_if_debug()
else()
# Production builds (warning are not treated as errors)
if("${COMPILER_FAMILY}" STREQUAL "msvc")
# https://docs.microsoft.com/en-us/cpp/build/reference/compiler-option-warning-level
# TODO: Enable /Wall and disable individual warnings until build compiles without errors
# /wdnnnn disables a warning where "nnnn" is a warning number
string(REPLACE "/W3" "" CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS}")
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} /W3")
elseif(("${COMPILER_FAMILY}" STREQUAL "clang") OR ("${COMPILER_FAMILY}" STREQUAL "gcc"))
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} -Wall")
else()
message(FATAL_ERROR "Unknown compiler. Version info:\n${COMPILER_VERSION_FULL}")
endif()
endif()
if("${COMPILER_FAMILY}" STREQUAL "msvc")
# Disable annoying "performance warning" about int-to-bool conversion
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} /wd4800")
# Disable unchecked iterator warnings, equivalent to /D_SCL_SECURE_NO_WARNINGS
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} /wd4996")
endif()
if("${COMPILER_FAMILY}" STREQUAL "gcc")
if("${COMPILER_VERSION}" VERSION_GREATER "6.0")
# Without this, gcc >= 7 warns related to changes in C++17
set(CXX_ONLY_FLAGS "${CXX_ONLY_FLAGS} -Wno-noexcept-type")
endif()
if("${COMPILER_VERSION}" VERSION_GREATER "4.9")
# Add colors when paired with ninja
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fdiagnostics-color=always")
endif()
if("${COMPILER_VERSION}" VERSION_LESS "6.0")
# Work around https://gcc.gnu.org/bugzilla/show_bug.cgi?id=43407
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} -Wno-attributes")
endif()
endif()
# Clang options for all builds
if("${COMPILER_FAMILY}" STREQUAL "clang")
# Using Clang with ccache causes a bunch of spurious warnings that are
# purportedly fixed in the next version of ccache. See the following for details:
#
# http://petereisentraut.blogspot.com/2011/05/ccache-and-clang.html
# http://petereisentraut.blogspot.com/2011/09/ccache-and-clang-part-2.html
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Qunused-arguments")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Qunused-arguments")
# Avoid clang error when an unknown warning flag is passed
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} -Wno-unknown-warning-option")
# Add colors when paired with ninja
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fcolor-diagnostics")
endif()
# if build warning flags is set, add to CXX_COMMON_FLAGS
if(BUILD_WARNING_FLAGS)
# Use BUILD_WARNING_FLAGS with BUILD_WARNING_LEVEL=everything to disable
# warnings (use with Clang's -Weverything flag to find potential errors)
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} ${BUILD_WARNING_FLAGS}")
endif(BUILD_WARNING_FLAGS)
# Only enable additional instruction sets if they are supported
if(CXX_SUPPORTS_SSE4_2)
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} -msse4.2")
endif()
if(CXX_SUPPORTS_ALTIVEC AND ARROW_ALTIVEC)
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} -maltivec")
endif()
if(CXX_SUPPORTS_ARMCRC)
if(CXX_SUPPORTS_ARMV8_CRC_CRYPTO)
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} -march=armv8-a+crc+crypto")
else()
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} -march=armv8-a+crc")
endif()
endif()
if(ARROW_USE_SIMD)
add_definitions(-DARROW_USE_SIMD)
endif()
if(APPLE)
# Depending on the default OSX_DEPLOYMENT_TARGET (< 10.9), libstdc++ may be
# the default standard library which does not support C++11. libc++ is the
# default from 10.9 onward.
set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} -stdlib=libc++")
endif()
# ----------------------------------------------------------------------
# Setup Gold linker, if available. Code originally from Apache Kudu
# Interrogates the linker version via the C++ compiler to determine whether
# we're using the gold linker, and if so, extracts its version.
#
# If the gold linker is being used, sets GOLD_VERSION in the parent scope with
# the extracted version.
#
# Any additional arguments are passed verbatim into the C++ compiler invocation.
function(GET_GOLD_VERSION)
# The gold linker is only for ELF binaries, which macOS doesn't use.
execute_process(COMMAND ${CMAKE_CXX_COMPILER} "-Wl,--version" ${ARGN}
ERROR_QUIET
OUTPUT_VARIABLE LINKER_OUTPUT)
# We're expecting LINKER_OUTPUT to look like one of these:
# GNU gold (version 2.24) 1.11
# GNU gold (GNU Binutils for Ubuntu 2.30) 1.15
if(LINKER_OUTPUT MATCHES "GNU gold")
string(REGEX MATCH "GNU gold \\([^\\)]*\\) (([0-9]+\\.?)+)" _ "${LINKER_OUTPUT}")
if(NOT CMAKE_MATCH_1)
message(SEND_ERROR "Could not extract GNU gold version. "
"Linker version output: ${LINKER_OUTPUT}")
endif()
set(GOLD_VERSION "${CMAKE_MATCH_1}" PARENT_SCOPE)
endif()
endfunction()
# Is the compiler hard-wired to use the gold linker?
if(NOT WIN32 AND NOT APPLE)
get_gold_version()
if(GOLD_VERSION)
set(MUST_USE_GOLD 1)
elseif(ARROW_USE_LD_GOLD)
# Can the compiler optionally enable the gold linker?
get_gold_version("-fuse-ld=gold")
# We can't use the gold linker if it's inside devtoolset because the compiler
# won't find it when invoked directly from make/ninja (which is typically
# done outside devtoolset).
execute_process(COMMAND which ld.gold
OUTPUT_VARIABLE GOLD_LOCATION
OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET)
if("${GOLD_LOCATION}" MATCHES "^/opt/rh/devtoolset")
message("Skipping optional gold linker (version ${GOLD_VERSION}) because "
"it's in devtoolset")
set(GOLD_VERSION)
endif()
endif()
if(GOLD_VERSION)
# Older versions of the gold linker are vulnerable to a bug [1] which
# prevents weak symbols from being overridden properly. This leads to
# omitting of dependencies like tcmalloc (used in Kudu, where this
# workaround was written originally)
#
# How we handle this situation depends on other factors:
# - If gold is optional, we won't use it.
# - If gold is required, we'll either:
# - Raise an error in RELEASE builds (we shouldn't release such a product), or
# - Drop tcmalloc in all other builds.
#
# 1. https://sourceware.org/bugzilla/show_bug.cgi?id=16979.
if("${GOLD_VERSION}" VERSION_LESS "1.12")
set(ARROW_BUGGY_GOLD 1)
endif()
if(MUST_USE_GOLD)
message("Using hard-wired gold linker (version ${GOLD_VERSION})")
if(ARROW_BUGGY_GOLD)
if("${ARROW_LINK}" STREQUAL "d" AND "${CMAKE_BUILD_TYPE}" STREQUAL "RELEASE")
message(SEND_ERROR "Configured to use buggy gold with dynamic linking "
"in a RELEASE build")
endif()
endif()
elseif(NOT ARROW_BUGGY_GOLD)
# The Gold linker must be manually enabled.
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fuse-ld=gold")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fuse-ld=gold")
message("Using optional gold linker (version ${GOLD_VERSION})")
else()
message("Optional gold linker is buggy, using ld linker instead")
endif()
else()
message("Using ld linker")
endif()
endif()
# compiler flags for different build types (run 'cmake -DCMAKE_BUILD_TYPE=<type> .')
# For all builds:
# For CMAKE_BUILD_TYPE=Debug
# -ggdb: Enable gdb debugging
# For CMAKE_BUILD_TYPE=FastDebug
# Same as DEBUG, except with some optimizations on.
# For CMAKE_BUILD_TYPE=Release
# -O3: Enable all compiler optimizations
# Debug symbols are stripped for reduced binary size. Add
# -DARROW_CXXFLAGS="-g" to add them
if(NOT MSVC)
if(ARROW_GGDB_DEBUG)
set(ARROW_DEBUG_SYMBOL_TYPE "gdb")
set(C_FLAGS_DEBUG "-g${ARROW_DEBUG_SYMBOL_TYPE} -O0")
set(C_FLAGS_FASTDEBUG "-g${ARROW_DEBUG_SYMBOL_TYPE} -O1")
set(CXX_FLAGS_DEBUG "-g${ARROW_DEBUG_SYMBOL_TYPE} -O0")
set(CXX_FLAGS_FASTDEBUG "-g${ARROW_DEBUG_SYMBOL_TYPE} -O1")
else()
set(C_FLAGS_DEBUG "-g -O0")
set(C_FLAGS_FASTDEBUG "-g -O1")
set(CXX_FLAGS_DEBUG "-g -O0")
set(CXX_FLAGS_FASTDEBUG "-g -O1")
endif()
set(C_FLAGS_RELEASE "-O3 -DNDEBUG")
set(CXX_FLAGS_RELEASE "-O3 -DNDEBUG")
endif()
set(C_FLAGS_PROFILE_GEN "${CXX_FLAGS_RELEASE} -fprofile-generate")
set(C_FLAGS_PROFILE_BUILD "${CXX_FLAGS_RELEASE} -fprofile-use")
set(CXX_FLAGS_PROFILE_GEN "${CXX_FLAGS_RELEASE} -fprofile-generate")
set(CXX_FLAGS_PROFILE_BUILD "${CXX_FLAGS_RELEASE} -fprofile-use")
# Set compile flags based on the build type.
message(
"Configured for ${CMAKE_BUILD_TYPE} build (set with cmake -DCMAKE_BUILD_TYPE={release,debug,...})"
)
if("${CMAKE_BUILD_TYPE}" STREQUAL "DEBUG")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${C_FLAGS_DEBUG}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CXX_FLAGS_DEBUG}")
elseif("${CMAKE_BUILD_TYPE}" STREQUAL "RELWITHDEBINFO")
elseif("${CMAKE_BUILD_TYPE}" STREQUAL "FASTDEBUG")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${C_FLAGS_FASTDEBUG}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CXX_FLAGS_FASTDEBUG}")
elseif("${CMAKE_BUILD_TYPE}" STREQUAL "RELEASE")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${C_FLAGS_RELEASE}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CXX_FLAGS_RELEASE}")
elseif("${CMAKE_BUILD_TYPE}" STREQUAL "PROFILE_GEN")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${C_FLAGS_PROFILE_GEN}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CXX_FLAGS_PROFILE_GEN}")
elseif("${CMAKE_BUILD_TYPE}" STREQUAL "PROFILE_BUILD")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${C_FLAGS_PROFILE_BUILD}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CXX_FLAGS_PROFILE_BUILD}")
else()
message(FATAL_ERROR "Unknown build type: ${CMAKE_BUILD_TYPE}")
endif()
if("${CMAKE_CXX_FLAGS}" MATCHES "-DNDEBUG")
set(ARROW_DEFINITION_FLAGS "-DNDEBUG")
else()
set(ARROW_DEFINITION_FLAGS "")
endif()
message(STATUS "Build Type: ${CMAKE_BUILD_TYPE}")
# ----------------------------------------------------------------------
# MSVC-specific linker options
if(MSVC)
set(MSVC_LINKER_FLAGS)
if(MSVC_LINK_VERBOSE)
set(MSVC_LINKER_FLAGS "${MSVC_LINKER_FLAGS} /VERBOSE:LIB")
endif()
if(NOT ARROW_USE_STATIC_CRT)
set(MSVC_LINKER_FLAGS "${MSVC_LINKER_FLAGS} /NODEFAULTLIB:LIBCMT")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${MSVC_LINKER_FLAGS}")
set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} ${MSVC_LINKER_FLAGS}")
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${MSVC_LINKER_FLAGS}")
endif()
endif()