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HandleLLVMOptions.cmake
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HandleLLVMOptions.cmake
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# This CMake module is responsible for interpreting the user defined LLVM_
# options and executing the appropriate CMake commands to realize the users'
# selections.
# This is commonly needed so make sure it's defined before we include anything
# else.
string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE)
include(CheckCompilerVersion)
include(CheckProblematicConfigurations)
include(HandleLLVMStdlib)
include(CheckCCompilerFlag)
include(CheckCSourceCompiles)
include(CheckCXXCompilerFlag)
include(CheckCXXSourceCompiles)
include(CheckSymbolExists)
include(CMakeDependentOption)
include(LLVMProcessSources)
if(CMAKE_LINKER MATCHES ".*lld" OR (LLVM_USE_LINKER STREQUAL "lld" OR LLVM_ENABLE_LLD))
set(LINKER_IS_LLD TRUE)
else()
set(LINKER_IS_LLD FALSE)
endif()
if(CMAKE_LINKER MATCHES "lld-link" OR (MSVC AND (LLVM_USE_LINKER STREQUAL "lld" OR LLVM_ENABLE_LLD)))
set(LINKER_IS_LLD_LINK TRUE)
else()
set(LINKER_IS_LLD_LINK FALSE)
endif()
set(LLVM_ENABLE_LTO OFF CACHE STRING "Build LLVM with LTO. May be specified as Thin or Full to use a particular kind of LTO")
string(TOUPPER "${LLVM_ENABLE_LTO}" uppercase_LLVM_ENABLE_LTO)
option(LLVM_ENABLE_FATLTO "Build LLVM with -ffat-lto-objects." OFF)
# Ninja Job Pool support
# The following only works with the Ninja generator in CMake >= 3.0.
set(LLVM_PARALLEL_COMPILE_JOBS "" CACHE STRING
"Define the maximum number of concurrent compilation jobs (Ninja only).")
if(LLVM_RAM_PER_COMPILE_JOB OR LLVM_RAM_PER_LINK_JOB OR LLVM_RAM_PER_TABLEGEN_JOB)
cmake_host_system_information(RESULT available_physical_memory QUERY AVAILABLE_PHYSICAL_MEMORY)
cmake_host_system_information(RESULT number_of_logical_cores QUERY NUMBER_OF_LOGICAL_CORES)
endif()
if(LLVM_RAM_PER_COMPILE_JOB)
math(EXPR jobs_with_sufficient_memory "${available_physical_memory} / ${LLVM_RAM_PER_COMPILE_JOB}" OUTPUT_FORMAT DECIMAL)
if (jobs_with_sufficient_memory LESS 1)
set(jobs_with_sufficient_memory 1)
endif()
if (jobs_with_sufficient_memory LESS number_of_logical_cores)
set(LLVM_PARALLEL_COMPILE_JOBS "${jobs_with_sufficient_memory}")
else()
set(LLVM_PARALLEL_COMPILE_JOBS "${number_of_logical_cores}")
endif()
endif()
if(LLVM_PARALLEL_COMPILE_JOBS)
if(NOT CMAKE_GENERATOR MATCHES "Ninja")
message(WARNING "Job pooling is only available with Ninja generators.")
else()
set_property(GLOBAL APPEND PROPERTY JOB_POOLS compile_job_pool=${LLVM_PARALLEL_COMPILE_JOBS})
set(CMAKE_JOB_POOL_COMPILE compile_job_pool)
endif()
endif()
set(LLVM_PARALLEL_LINK_JOBS "" CACHE STRING
"Define the maximum number of concurrent link jobs (Ninja only).")
if(LLVM_RAM_PER_LINK_JOB)
math(EXPR jobs_with_sufficient_memory "${available_physical_memory} / ${LLVM_RAM_PER_LINK_JOB}" OUTPUT_FORMAT DECIMAL)
if (jobs_with_sufficient_memory LESS 1)
set(jobs_with_sufficient_memory 1)
endif()
if (jobs_with_sufficient_memory LESS number_of_logical_cores)
set(LLVM_PARALLEL_LINK_JOBS "${jobs_with_sufficient_memory}")
else()
set(LLVM_PARALLEL_LINK_JOBS "${number_of_logical_cores}")
endif()
endif()
if(CMAKE_GENERATOR MATCHES "Ninja")
if(NOT LLVM_PARALLEL_LINK_JOBS AND uppercase_LLVM_ENABLE_LTO STREQUAL "THIN")
message(STATUS "ThinLTO provides its own parallel linking - limiting parallel link jobs to 2.")
set(LLVM_PARALLEL_LINK_JOBS "2")
endif()
if(LLVM_PARALLEL_LINK_JOBS)
set_property(GLOBAL APPEND PROPERTY JOB_POOLS link_job_pool=${LLVM_PARALLEL_LINK_JOBS})
set(CMAKE_JOB_POOL_LINK link_job_pool)
endif()
elseif(LLVM_PARALLEL_LINK_JOBS)
message(WARNING "Job pooling is only available with Ninja generators.")
endif()
set(LLVM_PARALLEL_TABLEGEN_JOBS "" CACHE STRING
"Define the maximum number of concurrent tablegen jobs (Ninja only).")
if(LLVM_RAM_PER_TABLEGEN_JOB)
math(EXPR jobs_with_sufficient_memory "${available_physical_memory} / ${LLVM_RAM_PER_TABLEGEN_JOB}" OUTPUT_FORMAT DECIMAL)
if (jobs_with_sufficient_memory LESS 1)
set(jobs_with_sufficient_memory 1)
endif()
if (jobs_with_sufficient_memory LESS number_of_logical_cores)
set(LLVM_PARALLEL_TABLEGEN_JOBS "${jobs_with_sufficient_memory}")
else()
set(LLVM_PARALLEL_TABLEGEN_JOBS "${number_of_logical_cores}")
endif()
endif()
if(LLVM_PARALLEL_TABLEGEN_JOBS)
if(NOT CMAKE_GENERATOR MATCHES "Ninja")
message(WARNING "Job pooling is only available with Ninja generators.")
else()
set_property(GLOBAL APPEND PROPERTY JOB_POOLS tablegen_job_pool=${LLVM_PARALLEL_TABLEGEN_JOBS})
# Job pool for tablegen is set on the add_custom_command
endif()
endif()
if( LLVM_ENABLE_ASSERTIONS )
# MSVC doesn't like _DEBUG on release builds. See PR 4379.
if( NOT MSVC )
add_compile_definitions(_DEBUG)
endif()
# On non-Debug builds cmake automatically defines NDEBUG, so we
# explicitly undefine it:
if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" )
add_compile_options($<$<OR:$<COMPILE_LANGUAGE:C>,$<COMPILE_LANGUAGE:CXX>>:-UNDEBUG>)
if (MSVC)
# Also remove /D NDEBUG to avoid MSVC warnings about conflicting defines.
foreach (flags_var_to_scrub
CMAKE_CXX_FLAGS_RELEASE
CMAKE_CXX_FLAGS_RELWITHDEBINFO
CMAKE_CXX_FLAGS_MINSIZEREL
CMAKE_C_FLAGS_RELEASE
CMAKE_C_FLAGS_RELWITHDEBINFO
CMAKE_C_FLAGS_MINSIZEREL)
string (REGEX REPLACE "(^| )[/-]D *NDEBUG($| )" " "
"${flags_var_to_scrub}" "${${flags_var_to_scrub}}")
endforeach()
endif()
endif()
# Enable assertions in libstdc++.
add_compile_definitions(_GLIBCXX_ASSERTIONS)
# Cautiously enable the extensive hardening mode in libc++.
if((DEFINED LIBCXX_HARDENING_MODE) AND
(NOT LIBCXX_HARDENING_MODE STREQUAL "extensive"))
message(WARNING "LLVM_ENABLE_ASSERTIONS implies LIBCXX_HARDENING_MODE \"extensive\" but is overriden from command line with value \"${LIBCXX_HARDENING_MODE}\".")
else()
set(LIBCXX_HARDENING_MODE "extensive")
endif()
endif()
# If we are targeting a GPU architecture in a runtimes build we want to ignore
# all the standard flag handling.
if(LLVM_RUNTIMES_GPU_BUILD)
return()
endif()
if(LLVM_ENABLE_EXPENSIVE_CHECKS)
# When LLVM_ENABLE_EXPENSIVE_CHECKS is ON, LLVM will intercept errors
# using assert(). An explicit check is performed here.
if (NOT LLVM_ENABLE_ASSERTIONS)
message(FATAL_ERROR "LLVM_ENABLE_EXPENSIVE_CHECKS requires LLVM_ENABLE_ASSERTIONS \"ON\".")
endif()
add_compile_definitions(EXPENSIVE_CHECKS)
# In some libstdc++ versions, std::min_element is not constexpr when
# _GLIBCXX_DEBUG is enabled.
CHECK_CXX_SOURCE_COMPILES("
#define _GLIBCXX_DEBUG
#include <algorithm>
int main(int argc, char** argv) {
static constexpr int data[] = {0, 1};
constexpr const int* min_elt = std::min_element(&data[0], &data[2]);
return 0;
}" CXX_SUPPORTS_GLIBCXX_DEBUG)
if(CXX_SUPPORTS_GLIBCXX_DEBUG)
add_compile_definitions(_GLIBCXX_DEBUG)
else()
add_compile_definitions(_GLIBCXX_ASSERTIONS)
endif()
endif()
if (LLVM_ENABLE_STRICT_FIXED_SIZE_VECTORS)
add_compile_definitions(STRICT_FIXED_SIZE_VECTORS)
endif()
string(TOUPPER "${LLVM_ABI_BREAKING_CHECKS}" uppercase_LLVM_ABI_BREAKING_CHECKS)
if( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "WITH_ASSERTS" )
if( LLVM_ENABLE_ASSERTIONS )
set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 )
endif()
elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_ON" )
set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 )
elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_OFF" )
# We don't need to do anything special to turn off ABI breaking checks.
elseif( NOT DEFINED LLVM_ABI_BREAKING_CHECKS )
# Treat LLVM_ABI_BREAKING_CHECKS like "FORCE_OFF" when it has not been
# defined.
else()
message(FATAL_ERROR "Unknown value for LLVM_ABI_BREAKING_CHECKS: \"${LLVM_ABI_BREAKING_CHECKS}\"!")
endif()
if( LLVM_REVERSE_ITERATION )
set( LLVM_ENABLE_REVERSE_ITERATION 1 )
endif()
if(WIN32)
set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)
if(CYGWIN)
set(LLVM_ON_WIN32 0)
set(LLVM_ON_UNIX 1)
else(CYGWIN)
set(LLVM_ON_WIN32 1)
set(LLVM_ON_UNIX 0)
endif(CYGWIN)
elseif(FUCHSIA OR UNIX)
set(LLVM_ON_WIN32 0)
set(LLVM_ON_UNIX 1)
if(APPLE OR ${CMAKE_SYSTEM_NAME} MATCHES "AIX")
set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)
else()
set(LLVM_HAVE_LINK_VERSION_SCRIPT 1)
endif()
elseif(CMAKE_SYSTEM_NAME STREQUAL "Generic")
set(LLVM_ON_WIN32 0)
set(LLVM_ON_UNIX 0)
set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)
else()
MESSAGE(SEND_ERROR "Unable to determine platform")
endif()
if (CMAKE_SYSTEM_NAME MATCHES "OS390")
set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)
endif()
set(EXEEXT ${CMAKE_EXECUTABLE_SUFFIX})
set(LTDL_SHLIB_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX})
# We use *.dylib rather than *.so on darwin, but we stick with *.so on AIX.
if(${CMAKE_SYSTEM_NAME} MATCHES "AIX")
set(LLVM_PLUGIN_EXT ${CMAKE_SHARED_MODULE_SUFFIX})
else()
set(LLVM_PLUGIN_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX})
endif()
if(APPLE)
# Darwin-specific linker flags for loadable modules.
set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-flat_namespace -Wl,-undefined -Wl,suppress")
endif()
if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
# RHEL7 has ar and ranlib being non-deterministic by default. The D flag forces determinism,
# however only GNU version of ar and ranlib (2.27) have this option.
# RHEL DTS7 is also affected by this, which uses GNU binutils 2.28
execute_process(COMMAND ${CMAKE_AR} rD t.a
WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
RESULT_VARIABLE AR_RESULT
OUTPUT_QUIET
ERROR_QUIET
)
if(${AR_RESULT} EQUAL 0)
execute_process(COMMAND ${CMAKE_RANLIB} -D t.a
WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
RESULT_VARIABLE RANLIB_RESULT
OUTPUT_QUIET
ERROR_QUIET
)
if(${RANLIB_RESULT} EQUAL 0)
set(CMAKE_C_ARCHIVE_CREATE "<CMAKE_AR> Dqc <TARGET> <LINK_FLAGS> <OBJECTS>"
CACHE STRING "archive create command")
set(CMAKE_C_ARCHIVE_APPEND "<CMAKE_AR> Dq <TARGET> <LINK_FLAGS> <OBJECTS>")
set(CMAKE_C_ARCHIVE_FINISH "<CMAKE_RANLIB> -D <TARGET>" CACHE STRING "ranlib command")
set(CMAKE_CXX_ARCHIVE_CREATE "<CMAKE_AR> Dqc <TARGET> <LINK_FLAGS> <OBJECTS>"
CACHE STRING "archive create command")
set(CMAKE_CXX_ARCHIVE_APPEND "<CMAKE_AR> Dq <TARGET> <LINK_FLAGS> <OBJECTS>")
set(CMAKE_CXX_ARCHIVE_FINISH "<CMAKE_RANLIB> -D <TARGET>" CACHE STRING "ranlib command")
endif()
file(REMOVE ${CMAKE_BINARY_DIR}/t.a)
endif()
endif()
if(${CMAKE_SYSTEM_NAME} MATCHES "AIX")
# -fPIC does not enable the large code model for GCC on AIX but does for XL.
if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
append("-mcmodel=large" CMAKE_CXX_FLAGS CMAKE_C_FLAGS)
append("-Wl,-bglink=large"
CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
elseif(CMAKE_CXX_COMPILER_ID MATCHES "XL")
# XL generates a small number of relocations not of the large model, -bbigtoc is needed.
append("-Wl,-bbigtoc"
CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
# The default behaviour on AIX processes dynamic initialization of non-local variables with
# static storage duration even for archive members that are otherwise unreferenced.
# Since `--whole-archive` is not used by the LLVM build to keep such initializations for Linux,
# we can limit the processing for archive members to only those that are otherwise referenced.
append("-bcdtors:mbr"
CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
endif()
if(BUILD_SHARED_LIBS)
# See rpath handling in AddLLVM.cmake
# FIXME: Remove this warning if this rpath is no longer hardcoded.
message(WARNING "Build and install environment path info may be exposed; binaries will also be unrelocatable.")
endif()
endif()
# Pass -Wl,-z,defs. This makes sure all symbols are defined. Otherwise a DSO
# build might work on ELF but fail on MachO/COFF.
if(NOT (CMAKE_SYSTEM_NAME MATCHES "Darwin|FreeBSD|OpenBSD|DragonFly|AIX|OS390" OR
WIN32 OR CYGWIN) AND
NOT LLVM_USE_SANITIZER)
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,defs")
endif()
# Pass -Wl,-z,nodelete. This makes sure our shared libraries are not unloaded
# by dlclose(). We need that since the CLI API relies on cross-references
# between global objects which became horribly broken when one of the libraries
# is unloaded.
if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,nodelete")
set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-z,nodelete")
endif()
function(append value)
foreach(variable ${ARGN})
set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
endforeach(variable)
endfunction()
function(append_if condition value)
if (${condition})
foreach(variable ${ARGN})
set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
endforeach(variable)
endif()
endfunction()
macro(add_flag_if_supported flag name)
check_c_compiler_flag("-Werror ${flag}" "C_SUPPORTS_${name}")
append_if("C_SUPPORTS_${name}" "${flag}" CMAKE_C_FLAGS)
check_cxx_compiler_flag("-Werror ${flag}" "CXX_SUPPORTS_${name}")
append_if("CXX_SUPPORTS_${name}" "${flag}" CMAKE_CXX_FLAGS)
endmacro()
function(add_flag_or_print_warning flag name)
check_c_compiler_flag("-Werror ${flag}" "C_SUPPORTS_${name}")
check_cxx_compiler_flag("-Werror ${flag}" "CXX_SUPPORTS_${name}")
if (C_SUPPORTS_${name} AND CXX_SUPPORTS_${name})
message(STATUS "Building with ${flag}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE)
set(CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} ${flag}" PARENT_SCOPE)
else()
message(WARNING "${flag} is not supported.")
endif()
endfunction()
function(has_msvc_incremental_no_flag flags incr_no_flag_on)
set(${incr_no_flag_on} OFF PARENT_SCOPE)
string(FIND "${flags}" "/INCREMENTAL" idx REVERSE)
if (${idx} GREATER -1)
string(SUBSTRING "${flags}" ${idx} 15 no_flag)
if (${no_flag} MATCHES "/INCREMENTAL:NO")
set(${incr_no_flag_on} ON PARENT_SCOPE)
endif()
endif()
endfunction()
if( LLVM_ENABLE_LLD )
if ( LLVM_USE_LINKER )
message(FATAL_ERROR "LLVM_ENABLE_LLD and LLVM_USE_LINKER can't be set at the same time")
endif()
# In case of MSVC cmake always invokes the linker directly, so the linker
# should be specified by CMAKE_LINKER cmake variable instead of by -fuse-ld
# compiler option.
if ( MSVC )
if(NOT CMAKE_LINKER MATCHES "lld-link")
get_filename_component(CXX_COMPILER_DIR ${CMAKE_CXX_COMPILER} DIRECTORY)
get_filename_component(C_COMPILER_DIR ${CMAKE_C_COMPILER} DIRECTORY)
find_program(LLD_LINK NAMES "lld-link" "lld-link.exe" HINTS ${CXX_COMPILER_DIR} ${C_COMPILER_DIR} DOC "lld linker")
if(NOT LLD_LINK)
message(FATAL_ERROR
"LLVM_ENABLE_LLD set, but cannot find lld-link. "
"Consider setting CMAKE_LINKER to lld-link path.")
endif()
set(CMAKE_LINKER ${LLD_LINK})
endif()
else()
set(LLVM_USE_LINKER "lld")
endif()
endif()
if( LLVM_USE_LINKER )
append("-fuse-ld=${LLVM_USE_LINKER}"
CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
check_cxx_source_compiles("int main() { return 0; }" CXX_SUPPORTS_CUSTOM_LINKER)
if ( NOT CXX_SUPPORTS_CUSTOM_LINKER )
message(FATAL_ERROR "Host compiler does not support '-fuse-ld=${LLVM_USE_LINKER}'. "
"Please make sure that '${LLVM_USE_LINKER}' is installed and "
"that your host compiler can compile a simple program when "
"given the option '-fuse-ld=${LLVM_USE_LINKER}'.")
endif()
endif()
if( LLVM_ENABLE_PIC )
if( XCODE )
# Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't
# know how to disable this, so just force ENABLE_PIC off for now.
message(WARNING "-fPIC not supported with Xcode.")
elseif( WIN32 OR CYGWIN)
# On Windows all code is PIC. MinGW warns if -fPIC is used.
else()
add_flag_or_print_warning("-fPIC" FPIC)
# Enable interprocedural optimizations for non-inline functions which would
# otherwise be disabled due to GCC -fPIC's default.
# Note: GCC<10.3 has a bug on SystemZ.
#
# Note: Clang allows IPO for -fPIC so this optimization is less effective.
# Clang 13 has a bug related to -fsanitize-coverage
# -fno-semantic-interposition (https://reviews.llvm.org/D117183).
if ((CMAKE_COMPILER_IS_GNUCXX AND
NOT (LLVM_NATIVE_ARCH STREQUAL "SystemZ" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 10.3))
OR (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND CMAKE_CXX_COMPILER_VERSION GREATER_EQUAL 14))
add_flag_if_supported("-fno-semantic-interposition" FNO_SEMANTIC_INTERPOSITION)
endif()
endif()
# GCC for MIPS can miscompile LLVM due to PR37701.
if(CMAKE_COMPILER_IS_GNUCXX AND LLVM_NATIVE_ARCH STREQUAL "Mips" AND
NOT Uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG")
add_flag_or_print_warning("-fno-shrink-wrap" FNO_SHRINK_WRAP)
endif()
# gcc with -O3 -fPIC generates TLS sequences that violate the spec on
# Solaris/sparcv9, causing executables created with the system linker
# to SEGV (GCC PR target/96607).
# clang with -O3 -fPIC generates code that SEGVs.
# Both can be worked around by compiling with -O instead.
if(${CMAKE_SYSTEM_NAME} STREQUAL "SunOS" AND LLVM_NATIVE_ARCH STREQUAL "Sparc")
llvm_replace_compiler_option(CMAKE_CXX_FLAGS_RELEASE "-O[23]" "-O")
llvm_replace_compiler_option(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O[23]" "-O")
endif()
endif()
if((NOT (${CMAKE_SYSTEM_NAME} MATCHES "AIX")) AND
(NOT (WIN32 OR CYGWIN) OR (MINGW AND CMAKE_CXX_COMPILER_ID MATCHES "Clang")))
# GCC for MinGW does nothing about -fvisibility-inlines-hidden, but warns
# about use of the attributes. As long as we don't use the attributes (to
# override the default) we shouldn't set the command line options either.
# GCC on AIX warns if -fvisibility-inlines-hidden is used and Clang on AIX doesn't currently support visibility.
check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG)
append_if(SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG "-fvisibility-inlines-hidden" CMAKE_CXX_FLAGS)
endif()
if(CMAKE_SIZEOF_VOID_P EQUAL 8 AND MINGW)
add_compile_definitions(_FILE_OFFSET_BITS=64)
endif()
if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
# TODO: support other platforms and toolchains.
if( LLVM_BUILD_32_BITS )
message(STATUS "Building 32 bits executables and libraries.")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32")
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32")
set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32")
# FIXME: CMAKE_SIZEOF_VOID_P is still 8
add_compile_definitions(_LARGEFILE_SOURCE)
add_compile_definitions(_FILE_OFFSET_BITS=64)
endif( LLVM_BUILD_32_BITS )
endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
# If building on a GNU specific 32-bit system, make sure off_t is 64 bits
# so that off_t can stored offset > 2GB.
# Android until version N (API 24) doesn't support it.
if (ANDROID AND (ANDROID_NATIVE_API_LEVEL LESS 24))
set(LLVM_FORCE_SMALLFILE_FOR_ANDROID TRUE)
endif()
if( CMAKE_SIZEOF_VOID_P EQUAL 4 AND NOT LLVM_FORCE_SMALLFILE_FOR_ANDROID)
# FIXME: It isn't handled in LLVM_BUILD_32_BITS.
add_compile_definitions(_LARGEFILE_SOURCE)
add_compile_definitions(_FILE_OFFSET_BITS=64)
endif()
if( XCODE )
# For Xcode enable several build settings that correspond to
# many warnings that are on by default in Clang but are
# not enabled for historical reasons. For versions of Xcode
# that do not support these options they will simply
# be ignored.
set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_RETURN_TYPE "YES")
set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_MISSING_NEWLINE "YES")
set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VALUE "YES")
set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VARIABLE "YES")
set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_SIGN_COMPARE "YES")
set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_FUNCTION "YES")
set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED "YES")
set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_HIDDEN_VIRTUAL_FUNCTIONS "YES")
set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNINITIALIZED_AUTOS "YES")
set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_BOOL_CONVERSION "YES")
set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_EMPTY_BODY "YES")
set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_ENUM_CONVERSION "YES")
set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_INT_CONVERSION "YES")
set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_CONSTANT_CONVERSION "YES")
set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_NON_VIRTUAL_DESTRUCTOR "YES")
endif()
# On Win32 using MS tools, provide an option to set the number of parallel jobs
# to use.
if( MSVC_IDE )
set(LLVM_COMPILER_JOBS "0" CACHE STRING
"Number of parallel compiler jobs. 0 means use all processors. Default is 0.")
if( NOT LLVM_COMPILER_JOBS STREQUAL "1" )
if( LLVM_COMPILER_JOBS STREQUAL "0" )
add_compile_options(/MP)
else()
message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS})
add_compile_options(/MP${LLVM_COMPILER_JOBS})
endif()
else()
message(STATUS "Parallel compilation disabled")
endif()
endif()
# set stack reserved size to ~10MB
if(MSVC)
# CMake previously automatically set this value for MSVC builds, but the
# behavior was changed in CMake 2.8.11 (Issue 12437) to use the MSVC default
# value (1 MB) which is not enough for us in tasks such as parsing recursive
# C++ templates in Clang.
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /STACK:10000000")
elseif(MINGW OR CYGWIN)
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--stack,16777216")
# Pass -mbig-obj to mingw gas to avoid COFF 2**16 section limit.
if (NOT CMAKE_CXX_COMPILER_ID MATCHES "Clang")
append("-Wa,-mbig-obj" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
endif()
option(LLVM_ENABLE_WARNINGS "Enable compiler warnings." ON)
if( MSVC )
# Add definitions that make MSVC much less annoying.
add_compile_definitions(
# For some reason MS wants to deprecate a bunch of standard functions...
_CRT_SECURE_NO_DEPRECATE
_CRT_SECURE_NO_WARNINGS
_CRT_NONSTDC_NO_DEPRECATE
_CRT_NONSTDC_NO_WARNINGS
_SCL_SECURE_NO_DEPRECATE
_SCL_SECURE_NO_WARNINGS
)
# Tell MSVC to use the Unicode version of the Win32 APIs instead of ANSI.
add_compile_definitions(
UNICODE
_UNICODE
)
if (LLVM_WINSYSROOT)
if (NOT CLANG_CL)
message(ERROR "LLVM_WINSYSROOT requires clang-cl")
endif()
append("/winsysroot${LLVM_WINSYSROOT}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
if (LINKER_IS_LLD_LINK)
append("/winsysroot:${LLVM_WINSYSROOT}"
CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS
CMAKE_SHARED_LINKER_FLAGS)
endif()
endif()
if (LLVM_ENABLE_WERROR)
append("/WX" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif (LLVM_ENABLE_WERROR)
append("/Zc:inline" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
if (NOT CMAKE_CXX_COMPILER_ID MATCHES "Clang")
# Enable standards-conforming preprocessor.
# https://learn.microsoft.com/en-us/cpp/build/reference/zc-preprocessor
append("/Zc:preprocessor" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif ()
# Some projects use the __cplusplus preprocessor macro to check support for
# a particular version of the C++ standard. When this option is not specified
# explicitly, macro's value is "199711L" that implies C++98 Standard.
# https://devblogs.microsoft.com/cppblog/msvc-now-correctly-reports-__cplusplus/
append("/Zc:__cplusplus" CMAKE_CXX_FLAGS)
# Allow users to request PDBs in release mode. CMake offeres the
# RelWithDebInfo configuration, but it uses different optimization settings
# (/Ob1 vs /Ob2 or -O2 vs -O3). LLVM provides this flag so that users can get
# PDBs without changing codegen.
option(LLVM_ENABLE_PDB OFF)
if (LLVM_ENABLE_PDB AND uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE")
append("/Zi" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
# /DEBUG disables linker GC and ICF, but we want those in Release mode.
append("/DEBUG /OPT:REF /OPT:ICF"
CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS
CMAKE_SHARED_LINKER_FLAGS)
endif()
# Get all linker flags in upper case form so we can search them.
string(CONCAT all_linker_flags_uppercase
${CMAKE_EXE_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} " "
${CMAKE_EXE_LINKER_FLAGS} " "
${CMAKE_MODULE_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} " "
${CMAKE_MODULE_LINKER_FLAGS} " "
${CMAKE_SHARED_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} " "
${CMAKE_SHARED_LINKER_FLAGS})
string(TOUPPER "${all_linker_flags_uppercase}" all_linker_flags_uppercase)
if (CLANG_CL AND LINKER_IS_LLD)
# If we are using clang-cl with lld-link and /debug is present in any of the
# linker flag variables, pass -gcodeview-ghash to the compiler to speed up
# linking. This flag is orthogonal from /Zi, /Z7, and other flags that
# enable debug info emission, and only has an effect if those are also in
# use.
string(FIND "${all_linker_flags_uppercase}" "/DEBUG" linker_flag_idx)
if (${linker_flag_idx} GREATER -1)
add_flag_if_supported("-gcodeview-ghash" GCODEVIEW_GHASH)
endif()
endif()
# "Generate Intrinsic Functions".
append("/Oi" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND NOT LLVM_ENABLE_LTO)
# clang-cl and cl by default produce non-deterministic binaries because
# link.exe /incremental requires a timestamp in the .obj file. clang-cl
# has the flag /Brepro to force deterministic binaries. We want to pass that
# whenever you're building with clang unless you're passing /incremental
# or using LTO (/Brepro with LTO would result in a warning about the flag
# being unused, because we're not generating object files).
# This checks CMAKE_CXX_COMPILER_ID in addition to check_cxx_compiler_flag()
# because cl.exe does not emit an error on flags it doesn't understand,
# letting check_cxx_compiler_flag() claim it understands all flags.
check_cxx_compiler_flag("/Brepro" SUPPORTS_BREPRO)
if (SUPPORTS_BREPRO)
# Check if /INCREMENTAL is passed to the linker and complain that it
# won't work with /Brepro.
has_msvc_incremental_no_flag("${CMAKE_EXE_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${CMAKE_EXE_LINKER_FLAGS}" NO_INCR_EXE)
has_msvc_incremental_no_flag("${CMAKE_MODULE_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${CMAKE_MODULE_LINKER_FLAGS}" NO_INCR_MODULE)
has_msvc_incremental_no_flag("${CMAKE_SHARED_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${CMAKE_SHARED_LINKER_FLAGS}" NO_INCR_SHARED)
if (NO_INCR_EXE AND NO_INCR_MODULE AND NO_INCR_SHARED)
append("/Brepro" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
else()
message(WARNING "/Brepro not compatible with /INCREMENTAL linking - builds will be non-deterministic")
endif()
endif()
endif()
# By default MSVC has a 2^16 limit on the number of sections in an object file,
# but in many objects files need more than that. This flag is to increase the
# number of sections.
append("/bigobj" CMAKE_CXX_FLAGS)
# Enable standards conformance mode.
# This ensures handling of various C/C++ constructs is more similar to other compilers.
append("/permissive-" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif( MSVC )
# Warnings-as-errors handling for GCC-compatible compilers:
if ( LLVM_COMPILER_IS_GCC_COMPATIBLE )
append_if(LLVM_ENABLE_WERROR "-Werror" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
append_if(LLVM_ENABLE_WERROR "-Wno-error" CMAKE_REQUIRED_FLAGS)
endif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
# Specific default warnings-as-errors for compilers accepting GCC-compatible warning flags:
if ( LLVM_COMPILER_IS_GCC_COMPATIBLE OR CMAKE_CXX_COMPILER_ID MATCHES "XL" )
add_flag_if_supported("-Werror=date-time" WERROR_DATE_TIME)
add_flag_if_supported("-Werror=unguarded-availability-new" WERROR_UNGUARDED_AVAILABILITY_NEW)
endif( LLVM_COMPILER_IS_GCC_COMPATIBLE OR CMAKE_CXX_COMPILER_ID MATCHES "XL" )
if ( LLVM_COMPILER_IS_GCC_COMPATIBLE )
# LLVM data structures like llvm::User and llvm::MDNode rely on
# the value of object storage persisting beyond the lifetime of the
# object (#24952). This is not standard compliant and causes a runtime
# crash if LLVM is built with GCC and LTO enabled (#57740). Until
# these bugs are fixed, we need to disable dead store eliminations
# based on object lifetime.
add_flag_if_supported("-fno-lifetime-dse" CMAKE_CXX_FLAGS)
endif ( LLVM_COMPILER_IS_GCC_COMPATIBLE )
# Modules enablement for GCC-compatible compilers:
if ( LLVM_COMPILER_IS_GCC_COMPATIBLE AND LLVM_ENABLE_MODULES )
set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
set(module_flags "-fmodules -fmodules-cache-path=${PROJECT_BINARY_DIR}/module.cache")
if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
# On Darwin -fmodules does not imply -fcxx-modules.
set(module_flags "${module_flags} -fcxx-modules")
endif()
if (LLVM_ENABLE_LOCAL_SUBMODULE_VISIBILITY)
set(module_flags "${module_flags} -Xclang -fmodules-local-submodule-visibility")
endif()
if (LLVM_ENABLE_MODULE_DEBUGGING AND
((uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") OR
(uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO")))
set(module_flags "${module_flags} -gmodules")
endif()
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${module_flags}")
# Check that we can build code with modules enabled, and that repeatedly
# including <cassert> still manages to respect NDEBUG properly.
CHECK_CXX_SOURCE_COMPILES("#undef NDEBUG
#include <cassert>
#define NDEBUG
#include <cassert>
int main() { assert(this code is not compiled); }"
CXX_SUPPORTS_MODULES)
set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
if (CXX_SUPPORTS_MODULES)
append("${module_flags}" CMAKE_CXX_FLAGS)
else()
message(FATAL_ERROR "LLVM_ENABLE_MODULES is not supported by this compiler")
endif()
endif( LLVM_COMPILER_IS_GCC_COMPATIBLE AND LLVM_ENABLE_MODULES )
if (MSVC)
if (NOT CLANG_CL)
set(msvc_warning_flags
# Disabled warnings.
-wd4141 # Suppress ''modifier' : used more than once' (because of __forceinline combined with inline)
-wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned'
-wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data'
-wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data'
-wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception'
-wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized'
-wd4456 # Suppress 'declaration of 'var' hides local variable'
-wd4457 # Suppress 'declaration of 'var' hides function parameter'
-wd4458 # Suppress 'declaration of 'var' hides class member'
-wd4459 # Suppress 'declaration of 'var' hides global declaration'
-wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated'
-wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible'
-wd4722 # Suppress 'function' : destructor never returns, potential memory leak
-wd4100 # Suppress 'unreferenced formal parameter'
-wd4127 # Suppress 'conditional expression is constant'
-wd4512 # Suppress 'assignment operator could not be generated'
-wd4505 # Suppress 'unreferenced local function has been removed'
-wd4610 # Suppress '<class> can never be instantiated'
-wd4510 # Suppress 'default constructor could not be generated'
-wd4702 # Suppress 'unreachable code'
-wd4245 # Suppress ''conversion' : conversion from 'type1' to 'type2', signed/unsigned mismatch'
-wd4706 # Suppress 'assignment within conditional expression'
-wd4310 # Suppress 'cast truncates constant value'
-wd4701 # Suppress 'potentially uninitialized local variable'
-wd4703 # Suppress 'potentially uninitialized local pointer variable'
-wd4389 # Suppress 'signed/unsigned mismatch'
-wd4611 # Suppress 'interaction between '_setjmp' and C++ object destruction is non-portable'
-wd4805 # Suppress 'unsafe mix of type <type> and type <type> in operation'
-wd4204 # Suppress 'nonstandard extension used : non-constant aggregate initializer'
-wd4577 # Suppress 'noexcept used with no exception handling mode specified; termination on exception is not guaranteed'
-wd4091 # Suppress 'typedef: ignored on left of '' when no variable is declared'
# C4592 is disabled because of false positives in Visual Studio 2015
# Update 1. Re-evaluate the usefulness of this diagnostic with Update 2.
-wd4592 # Suppress ''var': symbol will be dynamically initialized (implementation limitation)
-wd4319 # Suppress ''operator' : zero extending 'type' to 'type' of greater size'
# C4709 is disabled because of a bug with Visual Studio 2017 as of
# v15.8.8. Re-evaluate the usefulness of this diagnostic when the bug
# is fixed.
-wd4709 # Suppress comma operator within array index expression
# We'd like this warning to be enabled, but it triggers from code in
# WinBase.h that we don't have control over.
-wd5105 # Suppress macro expansion producing 'defined' has undefined behavior
# Ideally, we'd like this warning to be enabled, but even MSVC 2019 doesn't
# support the 'aligned' attribute in the way that clang sources requires (for
# any code that uses the LLVM_ALIGNAS macro), so this is must be disabled to
# avoid unwanted alignment warnings.
-wd4324 # Suppress 'structure was padded due to __declspec(align())'
# Promoted warnings.
-w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning.
# Promoted warnings to errors.
-we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error.
)
endif(NOT CLANG_CL)
# Enable warnings
if (LLVM_ENABLE_WARNINGS)
# Put /W4 in front of all the -we flags. cl.exe doesn't care, but for
# clang-cl having /W4 after the -we flags will re-enable the warnings
# disabled by -we.
set(msvc_warning_flags "/W4 ${msvc_warning_flags}")
# CMake appends /W3 by default, and having /W3 followed by /W4 will result in
# cl : Command line warning D9025 : overriding '/W3' with '/W4'. Since this is
# a command line warning and not a compiler warning, it cannot be suppressed except
# by fixing the command line.
string(REGEX REPLACE " /W[0-4]" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
string(REGEX REPLACE " /W[0-4]" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
if (LLVM_ENABLE_PEDANTIC)
# No MSVC equivalent available
endif (LLVM_ENABLE_PEDANTIC)
endif (LLVM_ENABLE_WARNINGS)
foreach(flag ${msvc_warning_flags})
append("${flag}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endforeach(flag)
endif (MSVC)
if (LLVM_ENABLE_WARNINGS AND (LLVM_COMPILER_IS_GCC_COMPATIBLE OR CLANG_CL))
# Don't add -Wall for clang-cl, because it maps -Wall to -Weverything for
# MSVC compatibility. /W4 is added above instead.
if (NOT CLANG_CL)
append("-Wall" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
append("-Wextra -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
append("-Wcast-qual" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
# Turn off missing field initializer warnings for gcc to avoid noise from
# false positives with empty {}. Turn them on otherwise (they're off by
# default for clang).
check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
if (CMAKE_COMPILER_IS_GNUCXX)
append("-Wno-missing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
else()
append("-Wmissing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
endif()
if (LLVM_ENABLE_PEDANTIC AND LLVM_COMPILER_IS_GCC_COMPATIBLE)
append("-pedantic" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
append("-Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
# GCC warns about redundant toplevel semicolons (enabled by -pedantic
# above), while Clang doesn't. Enable the corresponding Clang option to
# pick up on these even in builds with Clang.
add_flag_if_supported("-Wc++98-compat-extra-semi" CXX98_COMPAT_EXTRA_SEMI_FLAG)
endif()
add_flag_if_supported("-Wimplicit-fallthrough" IMPLICIT_FALLTHROUGH_FLAG)
add_flag_if_supported("-Wcovered-switch-default" COVERED_SWITCH_DEFAULT_FLAG)
append_if(USE_NO_UNINITIALIZED "-Wno-uninitialized" CMAKE_CXX_FLAGS)
append_if(USE_NO_MAYBE_UNINITIALIZED "-Wno-maybe-uninitialized" CMAKE_CXX_FLAGS)
# Disable -Wnonnull for GCC warning as it is emitting a lot of false positives.
if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
append("-Wno-nonnull" CMAKE_CXX_FLAGS)
endif()
# Disable -Wclass-memaccess, a C++-only warning from GCC 8 that fires on
# LLVM's ADT classes.
check_cxx_compiler_flag("-Wclass-memaccess" CXX_SUPPORTS_CLASS_MEMACCESS_FLAG)
append_if(CXX_SUPPORTS_CLASS_MEMACCESS_FLAG "-Wno-class-memaccess" CMAKE_CXX_FLAGS)
# Disable -Wredundant-move and -Wpessimizing-move on GCC>=9. GCC wants to
# remove std::move in code like "A foo(ConvertibleToA a) {
# return std::move(a); }", but this code does not compile (or uses the copy
# constructor instead) on clang<=3.8. Clang also has a -Wredundant-move and
# -Wpessimizing-move, but they only fire when the types match exactly, so we
# can keep them here.
if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
check_cxx_compiler_flag("-Wredundant-move" CXX_SUPPORTS_REDUNDANT_MOVE_FLAG)
append_if(CXX_SUPPORTS_REDUNDANT_MOVE_FLAG "-Wno-redundant-move" CMAKE_CXX_FLAGS)
check_cxx_compiler_flag("-Wpessimizing-move" CXX_SUPPORTS_PESSIMIZING_MOVE_FLAG)
append_if(CXX_SUPPORTS_PESSIMIZING_MOVE_FLAG "-Wno-pessimizing-move" CMAKE_CXX_FLAGS)
endif()
# The LLVM libraries have no stable C++ API, so -Wnoexcept-type is not useful.
check_cxx_compiler_flag("-Wnoexcept-type" CXX_SUPPORTS_NOEXCEPT_TYPE_FLAG)
append_if(CXX_SUPPORTS_NOEXCEPT_TYPE_FLAG "-Wno-noexcept-type" CMAKE_CXX_FLAGS)
# Check if -Wnon-virtual-dtor warns for a class marked final, when it has a
# friend declaration. If it does, don't add -Wnon-virtual-dtor. The case is
# considered unhelpful (https://gcc.gnu.org/PR102168).
set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror=non-virtual-dtor")
CHECK_CXX_SOURCE_COMPILES("class f {};
class base {friend f; public: virtual void anchor();protected: ~base();};
int main() { return 0; }"
CXX_WONT_WARN_ON_FINAL_NONVIRTUALDTOR)
set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
append_if(CXX_WONT_WARN_ON_FINAL_NONVIRTUALDTOR "-Wnon-virtual-dtor" CMAKE_CXX_FLAGS)
append("-Wdelete-non-virtual-dtor" CMAKE_CXX_FLAGS)
# Enable -Wsuggest-override if it's available, and only if it doesn't
# suggest adding 'override' to functions that are already marked 'final'
# (which means it is disabled for GCC < 9.2).
check_cxx_compiler_flag("-Wsuggest-override" CXX_SUPPORTS_SUGGEST_OVERRIDE_FLAG)
if (CXX_SUPPORTS_SUGGEST_OVERRIDE_FLAG)
set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror=suggest-override")
CHECK_CXX_SOURCE_COMPILES("class base {public: virtual void anchor();};
class derived : base {public: void anchor() final;};
int main() { return 0; }"
CXX_WSUGGEST_OVERRIDE_ALLOWS_ONLY_FINAL)
set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
append_if(CXX_WSUGGEST_OVERRIDE_ALLOWS_ONLY_FINAL "-Wsuggest-override" CMAKE_CXX_FLAGS)
endif()
# Check if -Wcomment is OK with an // comment ending with '\' if the next
# line is also a // comment.
set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror -Wcomment")
CHECK_C_SOURCE_COMPILES("// \\\\\\n//\\nint main(void) {return 0;}"
C_WCOMMENT_ALLOWS_LINE_WRAP)
set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
if (NOT C_WCOMMENT_ALLOWS_LINE_WRAP)
append("-Wno-comment" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
# Enable -Wstring-conversion to catch misuse of string literals.
add_flag_if_supported("-Wstring-conversion" STRING_CONVERSION_FLAG)
if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
# Disable the misleading indentation warning with GCC; GCC can
# produce noisy notes about this getting disabled in large files.
# See e.g. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89549
check_cxx_compiler_flag("-Wmisleading-indentation" CXX_SUPPORTS_MISLEADING_INDENTATION_FLAG)
append_if(CXX_SUPPORTS_MISLEADING_INDENTATION_FLAG "-Wno-misleading-indentation" CMAKE_CXX_FLAGS)
else()
# Prevent bugs that can happen with llvm's brace style.
add_flag_if_supported("-Wmisleading-indentation" MISLEADING_INDENTATION_FLAG)
endif()
# Enable -Wctad-maybe-unsupported to catch unintended use of CTAD.
add_flag_if_supported("-Wctad-maybe-unsupported" CTAD_MAYBE_UNSPPORTED_FLAG)
endif (LLVM_ENABLE_WARNINGS AND (LLVM_COMPILER_IS_GCC_COMPATIBLE OR CLANG_CL))
if (LLVM_COMPILER_IS_GCC_COMPATIBLE AND NOT LLVM_ENABLE_WARNINGS)
append("-w" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
macro(append_common_sanitizer_flags)
if (NOT MSVC OR CLANG_CL)
# Append -fno-omit-frame-pointer and turn on debug info to get better
# stack traces.
add_flag_if_supported("-fno-omit-frame-pointer" FNO_OMIT_FRAME_POINTER)
if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND
NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO")
add_flag_if_supported("-gline-tables-only" GLINE_TABLES_ONLY)
endif()
# Use -O1 even in debug mode, otherwise sanitizers slowdown is too large.
if (uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND LLVM_OPTIMIZE_SANITIZED_BUILDS)
add_flag_if_supported("-O1" O1)
endif()
else()
# Always ask the linker to produce symbols with asan.
append("/Z7" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
append("/debug" CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
# Not compatible with /INCREMENTAL link.
foreach (flags_opt_to_scrub
CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
string (REGEX REPLACE "(^| )/INCREMENTAL($| )" " /INCREMENTAL:NO "
"${flags_opt_to_scrub}" "${${flags_opt_to_scrub}}")
endforeach()
if (LLVM_HOST_TRIPLE MATCHES "i[2-6]86-.*")
# Keep frame pointers around.
append("/Oy-" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
endif()
endmacro()
# Turn on sanitizers if necessary.
if(LLVM_USE_SANITIZER)
if (LLVM_ON_UNIX)
if (LLVM_USE_SANITIZER STREQUAL "Address")
append_common_sanitizer_flags()
append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
elseif (LLVM_USE_SANITIZER STREQUAL "HWAddress")
append_common_sanitizer_flags()
append("-fsanitize=hwaddress" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?")
append_common_sanitizer_flags()
append("-fsanitize=memory" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
if(LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins")
append("-fsanitize-memory-track-origins" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
elseif (LLVM_USE_SANITIZER STREQUAL "Undefined")
append_common_sanitizer_flags()
append("${LLVM_UBSAN_FLAGS}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
elseif (LLVM_USE_SANITIZER STREQUAL "Thread")
append_common_sanitizer_flags()
append("-fsanitize=thread" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
elseif (LLVM_USE_SANITIZER STREQUAL "DataFlow")
append("-fsanitize=dataflow" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
elseif (LLVM_USE_SANITIZER STREQUAL "Address;Undefined" OR
LLVM_USE_SANITIZER STREQUAL "Undefined;Address")
append_common_sanitizer_flags()
append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
append("${LLVM_UBSAN_FLAGS}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
elseif (LLVM_USE_SANITIZER STREQUAL "Leaks")
append_common_sanitizer_flags()
append("-fsanitize=leak" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
else()
message(FATAL_ERROR "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}")
endif()
elseif(MINGW)
if (LLVM_USE_SANITIZER STREQUAL "Address")
append_common_sanitizer_flags()
append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
elseif (LLVM_USE_SANITIZER STREQUAL "Undefined")
append_common_sanitizer_flags()
append("${LLVM_UBSAN_FLAGS}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)