shylie/llvm-project
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
llvm-project/llvm/cmake/modules/HandleLLVMOptions.cmake
Thomas Fransham 59f8796aaa
Initial changes for llvm shared library build using explicit visibility annotations 
These are my initial build and code changes to supporting building llvm
as shared library/DLL on windows(without force exporting all symbols)
and making symbol visibility hidden by default on Linux which adding
explicit symbol visibility macros to the whole llvm codebase.

Updated cmake code to allow building llvm-shlib on windows by appending
/WHOLEARCHIVE:lib to the linker options.
Remove the hardcoded CMake error from using LLVM_BUILD_LLVM_DYLIB on
windows.
Updated CMake to define new macros to control conditional export macros
in llvm/Support/Compiler.h
Use /Zc:dllexportInlines- when compiling with clang-cl on windows with a
opt out CMake option to disable using it.
Replace some use of LLVM_EXTERNAL_VISIBILITY with new export macros.

Some of the cmake and code changes are based on @tstellar's earlier PR
https://github.com/llvm/llvm-project/pull/67502.

I have Windows building using clang-cl, while for MSVC its at-least able
to build libllvm, but some tests can't build because llvm iterator
template metaprogramming that doesn't work well with dllexport. Linux
should build without issue. My full branch is here
https://github.com/fsfod/llvm-project/tree/llvm-export-api-20.0 and
including all the auto generated export macros from clang tooling based
system.
2024-09-06 10:51:44 -07:00

1409 lines
62 KiB
CMake
Raw Blame History

# 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 \"${LIBCXX_HARDENING_MODE}\".")
else()
set(LIBCXX_HARDENING_MODE "extensive")
endif()
endif()
# If we are targeting a GPU architecture in a runtimes build we want to ignore
# all the standard flag handling.
if(LLVM_RUNTIMES_GPU_BUILD)
return()
endif()
if(LLVM_ENABLE_EXPENSIVE_CHECKS)
# When LLVM_ENABLE_EXPENSIVE_CHECKS is ON, LLVM will intercept errors
# using assert(). An explicit check is performed here.
if (NOT LLVM_ENABLE_ASSERTIONS)
message(FATAL_ERROR "LLVM_ENABLE_EXPENSIVE_CHECKS requires LLVM_ENABLE_ASSERTIONS \"ON\".")
endif()
add_compile_definitions(EXPENSIVE_CHECKS)
# In libstdc++ 9 and earlier, std::min_element is not constexpr when
# _GLIBCXX_DEBUG is enabled.
CHECK_CXX_SOURCE_COMPILES("
#define _GLIBCXX_DEBUG
#include <algorithm>
int main(int argc, char** argv) {
static constexpr int data[] = {0, 1};
constexpr const int* min_elt = std::min_element(&data[0], &data[2]);
return 0;
}" CXX_SUPPORTS_GLIBCXX_DEBUG)
if(CXX_SUPPORTS_GLIBCXX_DEBUG)
add_compile_definitions(_GLIBCXX_DEBUG)
else()
add_compile_definitions(_GLIBCXX_ASSERTIONS)
endif()
endif()
if (LLVM_ENABLE_STRICT_FIXED_SIZE_VECTORS)
add_compile_definitions(STRICT_FIXED_SIZE_VECTORS)
endif()
string(TOUPPER "${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=${LLVM_USE_LINKER}'.")
endif()
endif()
if( LLVM_ENABLE_PIC )
if( XCODE )
# Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't
# know how to disable this, so just force ENABLE_PIC off for now.
message(WARNING "-fPIC not supported with Xcode.")
elseif( WIN32 OR CYGWIN)
# On Windows all code is PIC. MinGW warns if -fPIC is used.
else()
add_flag_or_print_warning("-fPIC" FPIC)
# Enable interprocedural optimizations for non-inline functions which would
# otherwise be disabled due to GCC -fPIC's default.
# Note: GCC<10.3 has a bug on SystemZ.
#
# Note: Clang allows IPO for -fPIC so this optimization is less effective.
# Clang 13 has a bug related to -fsanitize-coverage
# -fno-semantic-interposition (https://reviews.llvm.org/D117183).
if ((CMAKE_COMPILER_IS_GNUCXX AND
NOT (LLVM_NATIVE_ARCH STREQUAL "SystemZ" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 10.3))
OR (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND CMAKE_CXX_COMPILER_VERSION GREATER_EQUAL 14))
add_flag_if_supported("-fno-semantic-interposition" FNO_SEMANTIC_INTERPOSITION)
endif()
endif()
# GCC for MIPS can miscompile LLVM due to PR37701.
if(CMAKE_COMPILER_IS_GNUCXX AND LLVM_NATIVE_ARCH STREQUAL "Mips" AND
NOT Uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG")
append("-fno-shrink-wrap" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
# gcc with -O3 -fPIC generates TLS sequences that violate the spec on
# Solaris/sparcv9, causing executables created with the system linker
# to SEGV (GCC PR target/96607).
# clang with -O3 -fPIC generates code that SEGVs.
# Both can be worked around by compiling with -O instead.
if(${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 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()
# 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" )
append("-Werror=date-time" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif( LLVM_COMPILER_IS_GCC_COMPATIBLE OR CMAKE_CXX_COMPILER_ID MATCHES "XL" )
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
append("-Werror=unguarded-availability-new" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
# 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.
append("-fno-lifetime-dse" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif ()
# 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()
append("${module_flags}" CMAKE_CXX_FLAGS)
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())'
# This is triggered for every variable that is a template type of a class even
# if there private when the class is dllexport'ed
-wd4251 # Suppress 'needs to have dll-interface to be used by clients'
# We only putting dll export on classes with out of line members so this
# warning gets triggered a lot for bases we haven't exported'
-wd4275 # non dll-interface class used as base for dll-interface class
# 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).
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()
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()
append("-Wimplicit-fallthrough" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
set(CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG 0)
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
set(CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG 1)
append("-Wcovered-switch-default" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
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.
if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 8.1)
append("-Wno-class-memaccess" CMAKE_CXX_FLAGS)
endif()
endif()
# 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")
if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 9.1)
append("-Wno-redundant-move" CMAKE_CXX_FLAGS)
append("-Wno-pessimizing-move" CMAKE_CXX_FLAGS)
endif()
endif()
# The LLVM libraries have no stable C++ API, so -Wnoexcept-type is not useful.
append("-Wno-noexcept-type" CMAKE_CXX_FLAGS)
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
append("-Wnon-virtual-dtor" CMAKE_CXX_FLAGS)
endif()
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.
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
append("-Wstring-conversion" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
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
append("-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.
append("-fno-omit-frame-pointer" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND
NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO" AND
CMAKE_CXX_COMPILER_ID MATCHES "Clang")
append("-gline-tables-only" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
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)
append("-O1" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
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)
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)
else()
message(FATAL_ERROR "This sanitizer not yet supported in a MinGW environment: ${LLVM_USE_SANITIZER}")
endif()
elseif(MSVC)
if (NOT LLVM_USE_SANITIZER MATCHES "^(Address|Undefined|Address;Undefined|Undefined;Address)$")
message(FATAL_ERROR "This sanitizer not yet supported in the MSVC environment: ${LLVM_USE_SANITIZER}")
endif()
append_common_sanitizer_flags()
if (LINKER_IS_LLD_LINK)
if (LLVM_HOST_TRIPLE MATCHES "i[2-6]86-.*")
set(arch "i386")
else()
set(arch "x86_64")
endif()
# Prepare ASAN runtime if needed
if (LLVM_USE_SANITIZER MATCHES ".*Address.*")
# lld string tail merging interacts badly with ASAN on Windows, turn it off here
# See https://github.com/llvm/llvm-project/issues/62078
append("/opt:nolldtailmerge" CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
if (${CMAKE_MSVC_RUNTIME_LIBRARY} MATCHES "^(MultiThreaded|MultiThreadedDebug)$")
append("/wholearchive:clang_rt.asan-${arch}.lib /wholearchive:clang_rt.asan_cxx-${arch}.lib"
CMAKE_EXE_LINKER_FLAGS)
append("/wholearchive:clang_rt.asan_dll_thunk-${arch}.lib"
CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
else()
append("clang_rt.asan_dynamic-${arch}.lib /wholearchive:clang_rt.asan_dynamic_runtime_thunk-${arch}.lib"
CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
endif()
endif()
endif()
if (LLVM_USE_SANITIZER MATCHES ".*Address.*")
if (NOT CLANG_CL)
append("/fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
# Not compatible with /RTC flags.
foreach (flags_opt_to_scrub
CMAKE_CXX_FLAGS_${uppercase_CMAKE_BUILD_TYPE} CMAKE_C_FLAGS_${uppercase_CMAKE_BUILD_TYPE})
string (REGEX REPLACE "(^| )/RTC[1csu]*($| )" " "
"${flags_opt_to_scrub}" "${${flags_opt_to_scrub}}")
endforeach()
else()
append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
endif()
if (LLVM_USE_SANITIZER MATCHES ".*Undefined.*")
if (NOT CLANG_CL)
message(FATAL_ERROR "This sanitizer is only supported by clang-cl: Undefined")
endif()
append(${LLVM_UBSAN_FLAGS} CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
else()
message(FATAL_ERROR "LLVM_USE_SANITIZER is not supported on this platform.")
endif()
if (LLVM_USE_SANITIZE_COVERAGE)
append("-fsanitize=fuzzer-no-link" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
if (LLVM_USE_SANITIZER MATCHES ".*Undefined.*")
set(IGNORELIST_FILE "${PROJECT_SOURCE_DIR}/utils/sanitizers/ubsan_ignorelist.txt")
if (EXISTS "${IGNORELIST_FILE}")
# Use this option name version since -fsanitize-ignorelist is only
# accepted with clang 13.0 or newer.
append("-fsanitize-blacklist=${IGNORELIST_FILE}"
CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
endif()
endif()
# Turn on -gsplit-dwarf if requested in debug builds.
if (LLVM_USE_SPLIT_DWARF AND
((uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") OR
(uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO")))
# Limit to clang and gcc so far. Add compilers supporting this option.
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR
CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
add_compile_options($<$<COMPILE_LANGUAGE:C,CXX>:-gsplit-dwarf>)
include(CheckLinkerFlag)
check_linker_flag(CXX "-Wl,--gdb-index" LINKER_SUPPORTS_GDB_INDEX)
append_if(LINKER_SUPPORTS_GDB_INDEX "-Wl,--gdb-index"
CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
endif()
endif()
add_compile_definitions(__STDC_CONSTANT_MACROS)
add_compile_definitions(__STDC_FORMAT_MACROS)
add_compile_definitions(__STDC_LIMIT_MACROS)
# clang and gcc don't default-print colored diagnostics when invoked from Ninja.
if (UNIX AND
CMAKE_GENERATOR MATCHES "Ninja" AND
(CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR
(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND
NOT (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9))))
append("-fdiagnostics-color" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
# lld doesn't print colored diagnostics when invoked from Ninja
if (UNIX AND CMAKE_GENERATOR MATCHES "Ninja")
include(CheckLinkerFlag)
check_linker_flag(CXX "-Wl,--color-diagnostics" LINKER_SUPPORTS_COLOR_DIAGNOSTICS)
append_if(LINKER_SUPPORTS_COLOR_DIAGNOSTICS "-Wl,--color-diagnostics"
CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
endif()
# Add flags for add_dead_strip().
# FIXME: With MSVS, consider compiling with /Gy and linking with /OPT:REF?
# But MinSizeRel seems to add that automatically, so maybe disable these
# flags instead if LLVM_NO_DEAD_STRIP is set.
if(NOT CYGWIN AND NOT MSVC)
if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin" AND
NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG")
if (CMAKE_CXX_COMPILER_ID MATCHES "XL")
append("-qfuncsect" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
else()
append("-ffunction-sections" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
append("-fdata-sections" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
elseif(MSVC)
if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" )
append("/Gw" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
endif()
if(MSVC)
# Remove flags here, for exceptions and RTTI.
# Each target property or source property should be responsible to control
# them.
# CL.EXE complains to override flags like "/GR /GR-".
string(REGEX REPLACE "(^| ) */EH[-cs]+ *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
string(REGEX REPLACE "(^| ) */GR-? *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
endif()
# Provide public options to globally control RTTI and EH
option(LLVM_ENABLE_EH "Enable Exception handling" OFF)
option(LLVM_ENABLE_RTTI "Enable run time type information" OFF)
if(LLVM_ENABLE_EH AND NOT LLVM_ENABLE_RTTI)
message(FATAL_ERROR "Exception handling requires RTTI. You must set LLVM_ENABLE_RTTI to ON")
endif()
option(LLVM_ENABLE_IR_PGO "Build LLVM and tools with IR PGO instrumentation (deprecated)" Off)
mark_as_advanced(LLVM_ENABLE_IR_PGO)
set(LLVM_BUILD_INSTRUMENTED OFF CACHE STRING "Build LLVM and tools with PGO instrumentation. May be specified as IR or Frontend")
set(LLVM_VP_COUNTERS_PER_SITE "1.5" CACHE STRING "Value profile counters to use per site for IR PGO with Clang")
mark_as_advanced(LLVM_BUILD_INSTRUMENTED LLVM_VP_COUNTERS_PER_SITE)
string(TOUPPER "${LLVM_BUILD_INSTRUMENTED}" uppercase_LLVM_BUILD_INSTRUMENTED)
if (LLVM_BUILD_INSTRUMENTED)
if (LLVM_ENABLE_IR_PGO OR uppercase_LLVM_BUILD_INSTRUMENTED STREQUAL "IR")
append("-fprofile-generate=\"${LLVM_PROFILE_DATA_DIR}\""
CMAKE_CXX_FLAGS
CMAKE_C_FLAGS)
if(NOT LINKER_IS_LLD_LINK)
append("-fprofile-generate=\"${LLVM_PROFILE_DATA_DIR}\""
CMAKE_EXE_LINKER_FLAGS
CMAKE_SHARED_LINKER_FLAGS)
endif()
# Set this to avoid running out of the value profile node section
# under clang in dynamic linking mode.
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND
CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 11 AND
LLVM_LINK_LLVM_DYLIB)
append("-Xclang -mllvm -Xclang -vp-counters-per-site=${LLVM_VP_COUNTERS_PER_SITE}"
CMAKE_CXX_FLAGS
CMAKE_C_FLAGS)
endif()
elseif(uppercase_LLVM_BUILD_INSTRUMENTED STREQUAL "CSIR")
append("-fcs-profile-generate=\"${LLVM_CSPROFILE_DATA_DIR}\""
CMAKE_CXX_FLAGS
CMAKE_C_FLAGS)
if(NOT LINKER_IS_LLD_LINK)
append("-fcs-profile-generate=\"${LLVM_CSPROFILE_DATA_DIR}\""
CMAKE_EXE_LINKER_FLAGS
CMAKE_SHARED_LINKER_FLAGS)
endif()
else()
append("-fprofile-instr-generate=\"${LLVM_PROFILE_FILE_PATTERN}\""
CMAKE_CXX_FLAGS
CMAKE_C_FLAGS)
if(NOT LINKER_IS_LLD_LINK)
append("-fprofile-instr-generate=\"${LLVM_PROFILE_FILE_PATTERN}\""
CMAKE_EXE_LINKER_FLAGS
CMAKE_SHARED_LINKER_FLAGS)
endif()
endif()
endif()
# When using clang-cl with an instrumentation-based tool, add clang's library
# resource directory to the library search path. Because cmake invokes the
# linker directly, it isn't sufficient to pass -fsanitize=* to the linker.
if (CLANG_CL AND (LLVM_BUILD_INSTRUMENTED OR LLVM_USE_SANITIZER))
execute_process(
COMMAND ${CMAKE_CXX_COMPILER} /clang:-print-libgcc-file-name /clang:--rtlib=compiler-rt
OUTPUT_VARIABLE clang_compiler_rt_file
ERROR_VARIABLE clang_cl_stderr
OUTPUT_STRIP_TRAILING_WHITESPACE
ERROR_STRIP_TRAILING_WHITESPACE
RESULT_VARIABLE clang_cl_exit_code)
if (NOT "${clang_cl_exit_code}" STREQUAL "0")
message(FATAL_ERROR
"Unable to invoke clang-cl to find resource dir: ${clang_cl_stderr}")
endif()
file(TO_CMAKE_PATH "${clang_compiler_rt_file}" clang_compiler_rt_file)
get_filename_component(clang_runtime_dir "${clang_compiler_rt_file}" DIRECTORY)
append("/libpath:\"${clang_runtime_dir}\""
CMAKE_EXE_LINKER_FLAGS
CMAKE_MODULE_LINKER_FLAGS
CMAKE_SHARED_LINKER_FLAGS)
endif()
if(LLVM_PROFDATA_FILE AND EXISTS ${LLVM_PROFDATA_FILE})
if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" )
append("-fprofile-instr-use=\"${LLVM_PROFDATA_FILE}\""
CMAKE_CXX_FLAGS
CMAKE_C_FLAGS)
if(NOT LINKER_IS_LLD_LINK)
append("-fprofile-instr-use=\"${LLVM_PROFDATA_FILE}\""
CMAKE_EXE_LINKER_FLAGS
CMAKE_SHARED_LINKER_FLAGS)
endif()
else()
message(FATAL_ERROR "LLVM_PROFDATA_FILE can only be specified when compiling with clang")
endif()
endif()
option(LLVM_BUILD_INSTRUMENTED_COVERAGE "Build LLVM and tools with Code Coverage instrumentation" Off)
option(LLVM_INDIVIDUAL_TEST_COVERAGE "Emit individual coverage file for each test case." OFF)
mark_as_advanced(LLVM_BUILD_INSTRUMENTED_COVERAGE)
append_if(LLVM_BUILD_INSTRUMENTED_COVERAGE "-fprofile-instr-generate=\"${LLVM_PROFILE_FILE_PATTERN}\" -fcoverage-mapping"
CMAKE_CXX_FLAGS
CMAKE_C_FLAGS
CMAKE_EXE_LINKER_FLAGS
CMAKE_SHARED_LINKER_FLAGS)
if (LLVM_BUILD_INSTRUMENTED AND LLVM_BUILD_INSTRUMENTED_COVERAGE)
message(FATAL_ERROR "LLVM_BUILD_INSTRUMENTED and LLVM_BUILD_INSTRUMENTED_COVERAGE cannot both be specified")
endif()
set(LLVM_THINLTO_CACHE_PATH "${PROJECT_BINARY_DIR}/lto.cache" CACHE STRING "Set ThinLTO cache path. This can be used when building LLVM from several different directiories.")
if(LLVM_ENABLE_LTO AND LLVM_ON_WIN32 AND NOT LINKER_IS_LLD_LINK AND NOT MINGW)
message(FATAL_ERROR "When compiling for Windows, LLVM_ENABLE_LTO requires using lld as the linker (point CMAKE_LINKER at lld-link.exe)")
endif()
if(uppercase_LLVM_ENABLE_LTO STREQUAL "THIN")
append("-flto=thin" CMAKE_CXX_FLAGS CMAKE_C_FLAGS)
if(NOT LINKER_IS_LLD_LINK)
append("-flto=thin" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
endif()
# If the linker supports it, enable the lto cache. This improves initial build
# time a little since we re-link a lot of the same objects, and significantly
# improves incremental build time.
# FIXME: We should move all this logic into the clang driver.
if(APPLE)
append("-Wl,-cache_path_lto,${LLVM_THINLTO_CACHE_PATH}"
CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
elseif((UNIX OR MINGW) AND LLVM_USE_LINKER STREQUAL "lld")
append("-Wl,--thinlto-cache-dir=${LLVM_THINLTO_CACHE_PATH}"
CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
elseif(LLVM_USE_LINKER STREQUAL "gold")
append("-Wl,--plugin-opt,cache-dir=${LLVM_THINLTO_CACHE_PATH}"
CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
elseif(LINKER_IS_LLD_LINK)
append("/lldltocache:${LLVM_THINLTO_CACHE_PATH}"
CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
endif()
elseif(uppercase_LLVM_ENABLE_LTO STREQUAL "FULL")
append("-flto=full" CMAKE_CXX_FLAGS CMAKE_C_FLAGS)
if(NOT LINKER_IS_LLD_LINK)
append("-flto=full" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
endif()
elseif(LLVM_ENABLE_LTO)
append("-flto" CMAKE_CXX_FLAGS CMAKE_C_FLAGS)
if(NOT LINKER_IS_LLD_LINK)
append("-flto" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
endif()
endif()
if(LLVM_ENABLE_FATLTO AND UNIX AND NOT APPLE)
append("-ffat-lto-objects" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
if(NOT LINKER_IS_LLD_LINK)
append("-ffat-lto-objects" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS)
endif()
endif()
# Set an AIX default for LLVM_EXPORT_SYMBOLS_FOR_PLUGINS based on whether we are
# doing dynamic linking (see below).
set(LLVM_EXPORT_SYMBOLS_FOR_PLUGINS_AIX_default OFF)
if (NOT (BUILD_SHARED_LIBS OR LLVM_LINK_LLVM_DYLIB))
set(LLVM_EXPORT_SYMBOLS_FOR_PLUGINS_AIX_default ON)
endif()
# This option makes utils/extract_symbols.py be used to determine the list of
# symbols to export from LLVM tools. This is necessary when on AIX or when using
# MSVC if you want to allow plugins. On AIX we don't show this option, and we
# enable it by default except when the LLVM libraries are set up for dynamic
# linking (due to incompatibility). With MSVC, note that the plugin has to
# explicitly link against (exactly one) tool so we can't unilaterally turn on
# LLVM_ENABLE_PLUGINS when it's enabled.
CMAKE_DEPENDENT_OPTION(LLVM_EXPORT_SYMBOLS_FOR_PLUGINS
"Export symbols from LLVM tools so that plugins can import them" OFF
"NOT ${CMAKE_SYSTEM_NAME} MATCHES AIX" ${LLVM_EXPORT_SYMBOLS_FOR_PLUGINS_AIX_default})
if(BUILD_SHARED_LIBS AND LLVM_EXPORT_SYMBOLS_FOR_PLUGINS)
message(FATAL_ERROR "BUILD_SHARED_LIBS not compatible with LLVM_EXPORT_SYMBOLS_FOR_PLUGINS")
endif()
if(LLVM_LINK_LLVM_DYLIB AND LLVM_EXPORT_SYMBOLS_FOR_PLUGINS)
message(FATAL_ERROR "LLVM_LINK_LLVM_DYLIB not compatible with LLVM_EXPORT_SYMBOLS_FOR_PLUGINS")
endif()
# By default we should enable LLVM_ENABLE_IDE only for multi-configuration
# generators. This option disables optional build system features that make IDEs
# less usable.
set(LLVM_ENABLE_IDE_default OFF)
if (CMAKE_CONFIGURATION_TYPES)
set(LLVM_ENABLE_IDE_default ON)
endif()
option(LLVM_ENABLE_IDE
"Disable optional build system features that cause problems for IDE generators"
${LLVM_ENABLE_IDE_default})
if (CMAKE_CONFIGURATION_TYPES AND NOT LLVM_ENABLE_IDE)
message(WARNING "Disabling LLVM_ENABLE_IDE on multi-configuration generators is not recommended.")
endif()
function(get_compile_definitions)
get_directory_property(top_dir_definitions DIRECTORY ${CMAKE_SOURCE_DIR} COMPILE_DEFINITIONS)
foreach(definition ${top_dir_definitions})
if(DEFINED result)
string(APPEND result " -D${definition}")
else()
set(result "-D${definition}")
endif()
endforeach()
set(LLVM_DEFINITIONS "${result}" PARENT_SCOPE)
endfunction()
get_compile_definitions()
option(LLVM_FORCE_ENABLE_STATS "Enable statistics collection for builds that wouldn't normally enable it" OFF)
check_symbol_exists(os_signpost_interval_begin "os/signpost.h" macos_signposts_available)
if(macos_signposts_available)
check_cxx_source_compiles(
"#include <os/signpost.h>
int main() { os_signpost_interval_begin(nullptr, 0, \"\", \"\"); return 0; }"
macos_signposts_usable)
if(macos_signposts_usable)
set(LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS "WITH_ASSERTS" CACHE STRING
"Enable support for Xcode signposts. Can be WITH_ASSERTS, FORCE_ON, FORCE_OFF")
string(TOUPPER "${LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS}"
uppercase_LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS)
if( uppercase_LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS STREQUAL "WITH_ASSERTS" )
if( LLVM_ENABLE_ASSERTIONS )
set( LLVM_SUPPORT_XCODE_SIGNPOSTS 1 )
endif()
elseif( uppercase_LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS STREQUAL "FORCE_ON" )
set( LLVM_SUPPORT_XCODE_SIGNPOSTS 1 )
elseif( uppercase_LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS STREQUAL "FORCE_OFF" )
# We don't need to do anything special to turn off signposts.
elseif( NOT DEFINED LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS )
# Treat LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS like "FORCE_OFF" when it has not been
# defined.
else()
message(FATAL_ERROR "Unknown value for LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS:"
" \"${LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS}\"!")
endif()
endif()
endif()
set(LLVM_SOURCE_PREFIX "" CACHE STRING "Use prefix for sources")
option(LLVM_USE_RELATIVE_PATHS_IN_DEBUG_INFO "Use relative paths in debug info" OFF)
if(LLVM_USE_RELATIVE_PATHS_IN_DEBUG_INFO)
check_c_compiler_flag("-fdebug-prefix-map=foo=bar" SUPPORTS_FDEBUG_PREFIX_MAP)
if(LLVM_ENABLE_PROJECTS_USED)
get_filename_component(source_root "${LLVM_MAIN_SRC_DIR}/.." ABSOLUTE)
else()
set(source_root "${LLVM_MAIN_SRC_DIR}")
endif()
file(RELATIVE_PATH relative_root "${CMAKE_BINARY_DIR}" "${source_root}")
append_if(SUPPORTS_FDEBUG_PREFIX_MAP "-fdebug-prefix-map=${CMAKE_BINARY_DIR}=${relative_root}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
append_if(SUPPORTS_FDEBUG_PREFIX_MAP "-fdebug-prefix-map=${source_root}/=${LLVM_SOURCE_PREFIX}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
if (LLVM_COMPILER_IS_GCC_COMPATIBLE)
append("-no-canonical-prefixes" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
endif()
option(LLVM_USE_RELATIVE_PATHS_IN_FILES "Use relative paths in sources and debug info" OFF)
if(LLVM_USE_RELATIVE_PATHS_IN_FILES)
check_c_compiler_flag("-ffile-prefix-map=foo=bar" SUPPORTS_FFILE_PREFIX_MAP)
if(LLVM_ENABLE_PROJECTS_USED)
get_filename_component(source_root "${LLVM_MAIN_SRC_DIR}/.." ABSOLUTE)
else()
set(source_root "${LLVM_MAIN_SRC_DIR}")
endif()
file(RELATIVE_PATH relative_root "${CMAKE_BINARY_DIR}" "${source_root}")
append_if(SUPPORTS_FFILE_PREFIX_MAP "-ffile-prefix-map=${CMAKE_BINARY_DIR}=${relative_root}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
append_if(SUPPORTS_FFILE_PREFIX_MAP "-ffile-prefix-map=${source_root}/=${LLVM_SOURCE_PREFIX}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
if (LLVM_COMPILER_IS_GCC_COMPATIBLE)
append("-no-canonical-prefixes" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
endif()
set(LLVM_THIRD_PARTY_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../third-party CACHE STRING
"Directory containing third party software used by LLVM (e.g. googletest)")
set(LLVM_UNITTEST_LINK_FLAGS "" CACHE STRING
"Additional linker flags for unit tests")
if(LLVM_ENABLE_LLVM_LIBC)
check_library_exists(llvmlibc printf "" HAVE_LLVM_LIBC)
if(NOT HAVE_LLVM_LIBC)
message(WARNING "Unable to link against LLVM libc. LLVM will be built without linking against the LLVM libc overlay.")
endif()
endif()
Reference in New Issue View Git Blame Copy Permalink