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llvm-mirror/cmake/modules/HandleLLVMOptions.cmake
Tobias Hieta 517e209cb5 [CMake] Properly handle the LTO cache arguments for MinGW 
We want to make sure that LINKER_IS_LLD_LINK is properly set - in
this case it shouldn't be set when building for MinGW.

Then we want to make the test for it correct and finally include
the option to build with thinlto cache since the MinGW driver now
supports that.

Differential Revision: https://reviews.llvm.org/D80493
2020-05-25 10:34:09 +03:00

1094 lines
48 KiB
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 "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE)
include(CheckCompilerVersion)
include(HandleLLVMStdlib)
include(CheckCCompilerFlag)
include(CheckCXXCompilerFlag)
include(CheckSymbolExists)
include(CMakeDependentOption)
if(CMAKE_LINKER MATCHES "lld-link" OR (MSVC AND (LLVM_USE_LINKER STREQUAL "lld" OR LLVM_ENABLE_LLD)))
set(LINKER_IS_LLD_LINK TRUE)
else()
set(LINKER_IS_LLD_LINK FALSE)
endif()
set(LLVM_ENABLE_LTO OFF CACHE STRING "Build LLVM with LTO. May be specified as Thin or Full to use a particular kind of LTO")
string(TOUPPER "${LLVM_ENABLE_LTO}" uppercase_LLVM_ENABLE_LTO)
# 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_PARALLEL_COMPILE_JOBS)
if(NOT CMAKE_MAKE_PROGRAM MATCHES "ninja")
message(WARNING "Job pooling is only available with Ninja generators.")
else()
set_property(GLOBAL APPEND PROPERTY JOB_POOLS compile_job_pool=${LLVM_PARALLEL_COMPILE_JOBS})
set(CMAKE_JOB_POOL_COMPILE compile_job_pool)
endif()
endif()
set(LLVM_PARALLEL_LINK_JOBS "" CACHE STRING
"Define the maximum number of concurrent link jobs (Ninja only).")
if(CMAKE_MAKE_PROGRAM MATCHES "ninja")
if(NOT LLVM_PARALLEL_LINK_JOBS AND uppercase_LLVM_ENABLE_LTO STREQUAL "THIN")
message(STATUS "ThinLTO provides its own parallel linking - limiting parallel link jobs to 2.")
set(LLVM_PARALLEL_LINK_JOBS "2")
endif()
if(LLVM_PARALLEL_LINK_JOBS)
set_property(GLOBAL APPEND PROPERTY JOB_POOLS link_job_pool=${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()
if( LLVM_ENABLE_ASSERTIONS )
# MSVC doesn't like _DEBUG on release builds. See PR 4379.
if( NOT MSVC )
add_definitions( -D_DEBUG )
endif()
# On non-Debug builds cmake automatically defines NDEBUG, so we
# explicitly undefine it:
if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" )
# NOTE: use `add_compile_options` rather than `add_definitions` since
# `add_definitions` does not support generator expressions.
add_compile_options($<$<OR:$<COMPILE_LANGUAGE:C>,$<COMPILE_LANGUAGE:CXX>>:-UNDEBUG>)
# 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()
if(LLVM_ENABLE_EXPENSIVE_CHECKS)
add_definitions(-DEXPENSIVE_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_definitions(-D_GLIBCXX_DEBUG)
else()
add_definitions(-D_GLIBCXX_ASSERTIONS)
endif()
endif()
if (LLVM_ENABLE_STRICT_FIXED_SIZE_VECTORS)
add_definitions(-DSTRICT_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)
else(WIN32)
if(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()
else(FUCHSIA OR UNIX)
MESSAGE(SEND_ERROR "Unable to determine platform")
endif(FUCHSIA OR UNIX)
endif(WIN32)
set(EXEEXT ${CMAKE_EXECUTABLE_SUFFIX})
set(LTDL_SHLIB_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX})
# We use *.dylib rather than *.so on darwin.
set(LLVM_PLUGIN_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX})
if(APPLE)
if(LLVM_ENABLE_LLD AND LLVM_ENABLE_LTO)
message(FATAL_ERROR "lld does not support LTO on Darwin")
endif()
# Darwin-specific linker flags for loadable modules.
set(CMAKE_MODULE_LINKER_FLAGS "${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>")
set(CMAKE_C_ARCHIVE_APPEND "<CMAKE_AR> Dq <TARGET> <LINK_FLAGS> <OBJECTS>")
set(CMAKE_C_ARCHIVE_FINISH "<CMAKE_RANLIB> -D <TARGET>")
set(CMAKE_CXX_ARCHIVE_CREATE "<CMAKE_AR> Dqc <TARGET> <LINK_FLAGS> <OBJECTS>")
set(CMAKE_CXX_ARCHIVE_APPEND "<CMAKE_AR> Dq <TARGET> <LINK_FLAGS> <OBJECTS>")
set(CMAKE_CXX_ARCHIVE_FINISH "<CMAKE_RANLIB> -D <TARGET>")
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 STREQUAL "GNU")
append("-mcmodel=large" CMAKE_CXX_FLAGS CMAKE_C_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()
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 (${CMAKE_SYSTEM_NAME} MATCHES "Darwin|FreeBSD|OpenBSD|DragonFly|AIX|SunOS" OR
WIN32 OR CYGWIN) AND
NOT LLVM_USE_SANITIZER)
set(CMAKE_SHARED_LINKER_FLAGS "${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()
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()
set(LLVM_USE_LINKER "lld")
endif()
if( LLVM_USE_LINKER )
set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fuse-ld=${LLVM_USE_LINKER}")
check_cxx_source_compiles("int main() { return 0; }" CXX_SUPPORTS_CUSTOM_LINKER)
if ( NOT CXX_SUPPORTS_CUSTOM_LINKER )
message(FATAL_ERROR "Host compiler does not support '-fuse-ld=${LLVM_USE_LINKER}'")
endif()
set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
append("-fuse-ld=${LLVM_USE_LINKER}"
CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
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)
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()
endif()
if(NOT WIN32 AND NOT CYGWIN AND NOT (${CMAKE_SYSTEM_NAME} MATCHES "AIX" AND CMAKE_CXX_COMPILER_ID STREQUAL "GNU"))
# MinGW warns if -fvisibility-inlines-hidden is used.
# GCC on AIX warns if -fvisibility-inlines-hidden is used.
check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG)
append_if(SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG "-fvisibility-inlines-hidden" CMAKE_CXX_FLAGS)
endif()
if(CMAKE_SIZEOF_VOID_P EQUAL 8 AND MINGW)
add_definitions( -D_FILE_OFFSET_BITS=64 )
endif()
if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
# TODO: support other platforms and toolchains.
if( LLVM_BUILD_32_BITS )
message(STATUS "Building 32 bits executables and libraries.")
set(CMAKE_CXX_FLAGS "${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_definitions(-D_LARGEFILE_SOURCE)
add_definitions(-D_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_definitions( -D_LARGEFILE_SOURCE )
add_definitions( -D_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_definitions( /MP )
else()
message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS})
add_definitions( /MP${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 "${CMAKE_EXE_LINKER_FLAGS} /STACK:10000000")
elseif(MINGW) # FIXME: Also cygwin?
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--stack,16777216")
# Pass -mbig-obj to mingw gas on Win64. COFF has a 2**16 section limit, and
# on Win64, every COMDAT function creates at least 3 sections: .text, .pdata,
# and .xdata.
if (CMAKE_SIZEOF_VOID_P EQUAL 8)
append("-Wa,-mbig-obj" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
endif()
if( MSVC )
include(ChooseMSVCCRT)
# Add definitions that make MSVC much less annoying.
add_definitions(
# For some reason MS wants to deprecate a bunch of standard functions...
-D_CRT_SECURE_NO_DEPRECATE
-D_CRT_SECURE_NO_WARNINGS
-D_CRT_NONSTDC_NO_DEPRECATE
-D_CRT_NONSTDC_NO_WARNINGS
-D_SCL_SECURE_NO_DEPRECATE
-D_SCL_SECURE_NO_WARNINGS
)
# Tell MSVC to use the Unicode version of the Win32 APIs instead of ANSI.
add_definitions(
-DUNICODE
-D_UNICODE
)
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)
# 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()
# Disable string literal const->non-const type conversion.
# "When specified, the compiler requires strict const-qualification
# conformance for pointers initialized by using string literals."
append("/Zc:strictStrings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
# "Generate Intrinsic Functions".
append("/Oi" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
# "Enforce type conversion rules".
append("/Zc:rvalueCast" 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.
string(TOUPPER "${CMAKE_EXE_LINKER_FLAGS}" upper_exe_flags)
string(TOUPPER "${CMAKE_MODULE_LINKER_FLAGS}" upper_module_flags)
string(TOUPPER "${CMAKE_SHARED_LINKER_FLAGS}" upper_shared_flags)
string(FIND "${upper_exe_flags} ${upper_module_flags} ${upper_shared_flags}"
"/INCREMENTAL" linker_flag_idx)
if (${linker_flag_idx} GREATER -1)
message(WARNING "/Brepro not compatible with /INCREMENTAL linking - builds will be non-deterministic")
else()
append("/Brepro" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
endif()
endif()
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" )
# 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
# 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_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)
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 -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 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, but it only fires when the types match exactly, so
# we can keep it 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)
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 even though the class is marked final.
# If it does, don't add it. So it won't be added on clang 3.4 and older.
# This also catches cases when -Wnon-virtual-dtor isn't supported by
# the compiler at all. This flag is not activated for gcc since it will
# incorrectly identify a protected non-virtual base when there is a friend
# declaration. Don't activate this in general on Windows as this warning has
# too many false positives on COM-style classes, which are destroyed with
# Release() (PR32286).
if (NOT CMAKE_COMPILER_IS_GNUCXX AND NOT WIN32)
set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++11 -Werror=non-virtual-dtor")
CHECK_CXX_SOURCE_COMPILES("class base {public: virtual void anchor();protected: ~base();};
class derived final : public base { public: ~derived();};
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)
endif()
# Enable -Wdelete-non-virtual-dtor if available.
add_flag_if_supported("-Wdelete-non-virtual-dtor" DELETE_NON_VIRTUAL_DTOR_FLAG)
# 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() {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)
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)
# 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()
elseif (CLANG_CL)
# Keep frame pointers around.
append("/Oy-" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
# 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)
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("-fsanitize=undefined -fno-sanitize=vptr,function -fno-sanitize-recover=all"
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,undefined -fno-sanitize=vptr,function -fno-sanitize-recover=all"
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(MSVC)
if (LLVM_USE_SANITIZER STREQUAL "Address")
append_common_sanitizer_flags()
append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
else()
message(FATAL_ERROR "This sanitizer not yet supported in the MSVC environment: ${LLVM_USE_SANITIZER}")
endif()
else()
message(FATAL_ERROR "LLVM_USE_SANITIZER is not supported on this platform.")
endif()
if (LLVM_USE_SANITIZER MATCHES "(Undefined;)?Address(;Undefined)?")
add_flag_if_supported("-fsanitize-address-use-after-scope"
FSANITIZE_USE_AFTER_SCOPE_FLAG)
endif()
if (LLVM_USE_SANITIZE_COVERAGE)
append("-fsanitize=fuzzer-no-link" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
if (LLVM_USE_SANITIZER MATCHES ".*Undefined.*")
set(BLACKLIST_FILE "${CMAKE_SOURCE_DIR}/utils/sanitizers/ubsan_blacklist.txt")
if (EXISTS "${BLACKLIST_FILE}")
append("-fsanitize-blacklist=${BLACKLIST_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(-gsplit-dwarf)
endif()
endif()
add_definitions( -D__STDC_CONSTANT_MACROS )
add_definitions( -D__STDC_FORMAT_MACROS )
add_definitions( -D__STDC_LIMIT_MACROS )
# clang and gcc don't default-print colored diagnostics when invoked from Ninja.
if (UNIX AND
CMAKE_GENERATOR STREQUAL "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 STREQUAL "Ninja")
include(CheckLinkerFlag)
check_linker_flag("-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 WIN32)
if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin" AND
NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG")
check_c_compiler_flag("-Werror -fno-function-sections" C_SUPPORTS_FNO_FUNCTION_SECTIONS)
if (C_SUPPORTS_FNO_FUNCTION_SECTIONS)
# Don't add -ffunction-sections if it can't be disabled with -fno-function-sections.
# Doing so will break sanitizers.
add_flag_if_supported("-ffunction-sections" FFUNCTION_SECTIONS)
elseif (CMAKE_CXX_COMPILER_ID MATCHES "XL")
append("-qfuncsect" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
add_flag_if_supported("-fdata-sections" FDATA_SECTIONS)
endif()
elseif(MSVC)
if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" )
append("/Gw" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
endif()
if(MSVC)
# Remove flags here, for exceptions and RTTI.
# Each target property or source property should be responsible to control
# them.
# CL.EXE complains to override flags like "/GR /GR-".
string(REGEX REPLACE "(^| ) */EH[-cs]+ *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
string(REGEX REPLACE "(^| ) */GR-? *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
endif()
# Provide public options to globally control RTTI and EH
option(LLVM_ENABLE_EH "Enable Exception handling" OFF)
option(LLVM_ENABLE_RTTI "Enable run time type information" OFF)
if(LLVM_ENABLE_EH AND NOT LLVM_ENABLE_RTTI)
message(FATAL_ERROR "Exception handling requires RTTI. You must set LLVM_ENABLE_RTTI to ON")
endif()
option(LLVM_USE_NEWPM "Build LLVM using the experimental new pass manager" Off)
mark_as_advanced(LLVM_USE_NEWPM)
if (LLVM_USE_NEWPM)
append("-fexperimental-new-pass-manager"
CMAKE_CXX_FLAGS
CMAKE_C_FLAGS
CMAKE_EXE_LINKER_FLAGS
CMAKE_SHARED_LINKER_FLAGS)
endif()
option(LLVM_ENABLE_IR_PGO "Build LLVM and tools with IR PGO instrumentation (deprecated)" Off)
mark_as_advanced(LLVM_ENABLE_IR_PGO)
set(LLVM_BUILD_INSTRUMENTED OFF CACHE STRING "Build LLVM and tools with PGO instrumentation. May be specified as IR or Frontend")
mark_as_advanced(LLVM_BUILD_INSTRUMENTED)
string(TOUPPER "${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()
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 ${CMAKE_CXX_COMPILER} /clang:-print-resource-dir
OUTPUT_VARIABLE clang_resource_dir
ERROR_VARIABLE clang_cl_stderr
OUTPUT_STRIP_TRAILING_WHITESPACE
ERROR_STRIP_TRAILING_WHITESPACE
RESULT_VARIABLE clang_cl_exit_code)
if (NOT "${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_resource_dir}" clang_resource_dir)
append("/libpath:${clang_resource_dir}/lib/windows"
CMAKE_EXE_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)
mark_as_advanced(LLVM_BUILD_INSTRUMENTED_COVERAGE)
append_if(LLVM_BUILD_INSTRUMENTED_COVERAGE "-fprofile-instr-generate=\"${LLVM_PROFILE_FILE_PATTERN}\" -fcoverage-mapping"
CMAKE_CXX_FLAGS
CMAKE_C_FLAGS
CMAKE_EXE_LINKER_FLAGS
CMAKE_SHARED_LINKER_FLAGS)
if (LLVM_BUILD_INSTRUMENTED AND LLVM_BUILD_INSTRUMENTED_COVERAGE)
message(FATAL_ERROR "LLVM_BUILD_INSTRUMENTED and LLVM_BUILD_INSTRUMENTED_COVERAGE cannot both be specified")
endif()
if(LLVM_ENABLE_LTO AND LLVM_ON_WIN32 AND NOT LINKER_IS_LLD_LINK AND NOT MINGW)
message(FATAL_ERROR "When compiling for Windows, LLVM_ENABLE_LTO requires using lld as the linker (point CMAKE_LINKER at lld-link.exe)")
endif()
if(uppercase_LLVM_ENABLE_LTO STREQUAL "THIN")
append("-flto=thin" CMAKE_CXX_FLAGS CMAKE_C_FLAGS)
if(NOT LINKER_IS_LLD_LINK)
append("-flto=thin" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
endif()
# If the linker supports it, enable the lto cache. This improves initial build
# time a little since we re-link a lot of the same objects, and significantly
# improves incremental build time.
# FIXME: We should move all this logic into the clang driver.
if(APPLE)
append("-Wl,-cache_path_lto,${PROJECT_BINARY_DIR}/lto.cache"
CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
elseif((UNIX OR MINGW) AND LLVM_USE_LINKER STREQUAL "lld")
append("-Wl,--thinlto-cache-dir=${PROJECT_BINARY_DIR}/lto.cache"
CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
elseif(LLVM_USE_LINKER STREQUAL "gold")
append("-Wl,--plugin-opt,cache-dir=${PROJECT_BINARY_DIR}/lto.cache"
CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
elseif(LINKER_IS_LLD_LINK)
append("/lldltocache:${PROJECT_BINARY_DIR}/lto.cache"
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()
# 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 "${source_root}" "${CMAKE_BINARY_DIR}")
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)
add_flag_if_supported("-no-canonical-prefixes" NO_CANONICAL_PREFIXES)
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 "${source_root}" "${CMAKE_BINARY_DIR}")
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)
add_flag_if_supported("-no-canonical-prefixes" NO_CANONICAL_PREFIXES)
endif()
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