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llvm-project/llvm/cmake/modules/HandleLLVMOptions.cmake

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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.
include(AddLLVMDefinitions)
include(CheckCCompilerFlag)
include(CheckCXXCompilerFlag)
if( CMAKE_COMPILER_IS_GNUCXX )
set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
elseif( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" )
set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
endif()
if( LLVM_ENABLE_ASSERTIONS )
# MSVC doesn't like _DEBUG on release builds. See PR 4379.
if( NOT MSVC )
add_definitions( -D_DEBUG )
endif()
# On Release builds cmake automatically defines NDEBUG, so we
# explicitly undefine it:
if( uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" )
add_definitions( -UNDEBUG )
endif()
else()
if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" )
if( NOT MSVC_IDE AND NOT XCODE )
add_definitions( -DNDEBUG )
endif()
endif()
endif()
if(WIN32)
if(CYGWIN)
set(LLVM_ON_WIN32 0)
set(LLVM_ON_UNIX 1)
else(CYGWIN)
set(LLVM_ON_WIN32 1)
set(LLVM_ON_UNIX 0)
endif(CYGWIN)
set(LTDL_SHLIB_EXT ".dll")
set(EXEEXT ".exe")
# Maximum path length is 160 for non-unicode paths
set(MAXPATHLEN 160)
else(WIN32)
if(UNIX)
set(LLVM_ON_WIN32 0)
set(LLVM_ON_UNIX 1)
if(APPLE)
set(LTDL_SHLIB_EXT ".dylib")
else(APPLE)
set(LTDL_SHLIB_EXT ".so")
endif(APPLE)
set(EXEEXT "")
# FIXME: Maximum path length is currently set to 'safe' fixed value
set(MAXPATHLEN 2024)
else(UNIX)
MESSAGE(SEND_ERROR "Unable to determine platform")
endif(UNIX)
endif(WIN32)
function(add_flag_or_print_warning flag)
check_c_compiler_flag(${flag} C_SUPPORTS_FLAG)
check_cxx_compiler_flag(${flag} CXX_SUPPORTS_FLAG)
if (C_SUPPORTS_FLAG AND CXX_SUPPORTS_FLAG)
message(STATUS "Building with ${flag}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE)
else()
message(WARNING "${flag} is not supported.")
endif()
endfunction()
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}} ${value}" PARENT_SCOPE)
endforeach(variable)
endif()
endfunction()
macro(add_flag_if_supported flag)
check_c_compiler_flag(${flag} C_SUPPORTS_FLAG)
append_if(C_SUPPORTS_FLAG "${flag}" CMAKE_C_FLAGS)
check_cxx_compiler_flag(${flag} CXX_SUPPORTS_FLAG)
append_if(CXX_SUPPORTS_FLAG "${flag}" CMAKE_CXX_FLAGS)
endmacro()
if( LLVM_ENABLE_PIC )
if( XCODE )
# Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't
# know how to disable this, so just force ENABLE_PIC off for now.
message(WARNING "-fPIC not supported with Xcode.")
elseif( WIN32 OR CYGWIN)
# On Windows all code is PIC. MinGW warns if -fPIC is used.
else()
add_flag_or_print_warning("-fPIC")
if( WIN32 OR CYGWIN)
# MinGW warns if -fvisibility-inlines-hidden is used.
else()
check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG)
append_if(SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG "-fvisibility-inlines-hidden" CMAKE_CXX_FLAGS)
endif()
endif()
endif()
if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
# TODO: support other platforms and toolchains.
if( LLVM_BUILD_32_BITS )
message(STATUS "Building 32 bits executables and libraries.")
add_llvm_definitions( -m32 )
set(CMAKE_EXE_LINKER_FLAGS "${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")
endif( LLVM_BUILD_32_BITS )
endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
# 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_llvm_definitions( /MP )
else()
if (MSVC10)
message(FATAL_ERROR
"Due to a bug in CMake only 0 and 1 is supported for "
"LLVM_COMPILER_JOBS when generating for Visual Studio 2010")
else()
message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS})
add_llvm_definitions( /MP${LLVM_COMPILER_JOBS} )
endif()
endif()
else()
message(STATUS "Parallel compilation disabled")
endif()
endif()
if( MSVC )
include(ChooseMSVCCRT)
if( MSVC11 )
add_llvm_definitions(-D_VARIADIC_MAX=10)
endif()
# Add definitions that make MSVC much less annoying.
add_llvm_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
# Disabled warnings.
-wd4065 # Suppress 'switch statement contains 'default' but no 'case' labels'
-wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned'
-wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored'
-wd4181 # Suppress 'qualifier applied to reference type; ignored'
-wd4224 # Suppress 'nonstandard extension used : formal parameter 'identifier' was previously defined as a type'
-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'
-wd4275 # Suppress 'An exported class was derived from a class that was not exported.'
-wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception'
-wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized'
-wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized'
-wd4355 # Suppress ''this' : used in base member initializer list'
-wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated'
-wd4551 # Suppress 'function call missing argument list'
-wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible'
-wd4715 # Suppress ''function' : not all control paths return a value'
-wd4722 # Suppress ''function' : destructor never returns, potential memory leak'
-wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)'
# 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.
)
# Enable warnings
if (LLVM_ENABLE_WARNINGS)
add_llvm_definitions( /W4 )
if (LLVM_ENABLE_PEDANTIC)
# No MSVC equivalent available
endif (LLVM_ENABLE_PEDANTIC)
endif (LLVM_ENABLE_WARNINGS)
if (LLVM_ENABLE_WERROR)
add_llvm_definitions( /WX )
endif (LLVM_ENABLE_WERROR)
elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
if (LLVM_ENABLE_WARNINGS)
append("-Wall -W -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
# Turn off missing field initializer warnings for gcc to avoid noise from
# false positives with empty {}. Turn them on otherwise (they're off by
# default for clang).
check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
if (CMAKE_COMPILER_IS_GNUCXX)
append("-Wno-missing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
else()
append("-Wmissing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
endif()
append_if(LLVM_ENABLE_PEDANTIC "-pedantic -Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
check_cxx_compiler_flag("-Werror -Wcovered-switch-default" CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
append_if(CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG "-Wcovered-switch-default" CMAKE_CXX_FLAGS)
check_c_compiler_flag("-Werror -Wcovered-switch-default" C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
append_if(C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG "-Wcovered-switch-default" CMAKE_C_FLAGS)
append_if(USE_NO_UNINITIALIZED "-Wno-uninitialized" CMAKE_CXX_FLAGS)
append_if(USE_NO_MAYBE_UNINITIALIZED "-Wno-maybe-uninitialized" CMAKE_CXX_FLAGS)
check_cxx_compiler_flag("-Werror -Wnon-virtual-dtor" CXX_SUPPORTS_NON_VIRTUAL_DTOR_FLAG)
append_if(CXX_SUPPORTS_NON_VIRTUAL_DTOR_FLAG "-Wnon-virtual-dtor" CMAKE_CXX_FLAGS)
endif (LLVM_ENABLE_WARNINGS)
if (LLVM_ENABLE_WERROR)
add_llvm_definitions( -Werror )
endif (LLVM_ENABLE_WERROR)
endif( MSVC )
macro(append_common_sanitizer_flags)
# Append -fno-omit-frame-pointer and turn on debug info to get better
# stack traces.
add_flag_if_supported("-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")
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()
add_flag_or_print_warning("-fsanitize=address")
elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?")
append_common_sanitizer_flags()
add_flag_or_print_warning("-fsanitize=memory")
# -pie is required for MSan.
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -pie")
if(LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins")
add_flag_or_print_warning("-fsanitize-memory-track-origins")
endif()
else()
message(WARNING "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}")
endif()
else()
message(WARNING "LLVM_USE_SANITIZER is not supported on this platform.")
endif()
endif()
add_llvm_definitions( -D__STDC_CONSTANT_MACROS )
add_llvm_definitions( -D__STDC_FORMAT_MACROS )
add_llvm_definitions( -D__STDC_LIMIT_MACROS )
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