# 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( MSVC ) set(LLVM_COMPILER_IS_GCC_COMPATIBLE OFF) elseif( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" ) set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON) endif() if( LLVM_ENABLE_ASSERTIONS ) # MSVC doesn't like _DEBUG on release builds. See PR 4379. if( NOT MSVC ) add_definitions( -D_DEBUG ) endif() # On non-Debug builds cmake automatically defines NDEBUG, so we # explicitly undefine it: if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" ) add_definitions( -UNDEBUG ) # Also remove /D NDEBUG to avoid MSVC warnings about conflicting defines. set(REGEXP_NDEBUG "(^| )[/-]D *NDEBUG($| )") string (REGEX REPLACE "${REGEXP_NDEBUG}" " " CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}") string (REGEX REPLACE "${REGEXP_NDEBUG}" " " CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}") string (REGEX REPLACE "${REGEXP_NDEBUG}" " " CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL}") 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( NOT (${CMAKE_VERSION} VERSION_LESS 2.8.11) ) # set stack reserved size to ~10MB # CMake previously automatically set this value for MSVC builds, but the # behavior was changed in CMake 2.8.11 (Issue 12437) to use the MSVC default # value (1 MB) which is not enough for us in tasks such as parsing recursive # C++ templates in Clang. set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /STACK:10000000") endif() if( MSVC10 ) # MSVC 10 will complain about headers in the STL not being exported, but # will not complain in MSVC 11. add_llvm_definitions( -wd4275 # Suppress 'An exported class was derived from a class that was not exported.' ) elseif( 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. -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned' -wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored' -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' -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' -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible' -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)' -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception' # 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() # Use -O1 even in debug mode, otherwise sanitizers slowdown is too large. if (uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") add_flag_if_supported("-O1") 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") 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() # Turn on -gsplit-dwarf if requested if(LLVM_USE_SPLIT_DWARF) add_llvm_definitions("-gsplit-dwarf") endif() add_llvm_definitions( -D__STDC_CONSTANT_MACROS ) add_llvm_definitions( -D__STDC_FORMAT_MACROS ) add_llvm_definitions( -D__STDC_LIMIT_MACROS ) # clang doesn't print colored diagnostics when invoked from Ninja if (UNIX AND CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND CMAKE_GENERATOR STREQUAL "Ninja") append("-fcolor-diagnostics" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) endif()