# 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(HandleLLVMStdlib) include(AddLLVMDefinitions) include(CheckCCompilerFlag) include(CheckCXXCompilerFlag) if(NOT LLVM_FORCE_USE_OLD_TOOLCHAIN) if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU") if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.7) message(FATAL_ERROR "Host GCC version must be at least 4.7!") endif() elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang") if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.1) message(FATAL_ERROR "Host Clang version must be at least 3.1!") endif() if (CMAKE_CXX_SIMULATE_ID MATCHES "MSVC") if (CMAKE_CXX_SIMULATE_VERSION VERSION_LESS 18.0) message(FATAL_ERROR "Host Clang must have at least -fms-compatibility-version=18.0") endif() set(CLANG_CL 1) elseif(NOT LLVM_ENABLE_LIBCXX) # Otherwise, test that we aren't using too old of a version of libstdc++ # with the Clang compiler. 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Default is 0.") if( NOT LLVM_COMPILER_JOBS STREQUAL "1" ) if( LLVM_COMPILER_JOBS STREQUAL "0" ) add_llvm_definitions( /MP ) else() message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS}) add_llvm_definitions( /MP${LLVM_COMPILER_JOBS} ) 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( 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 ) set(msvc_warning_flags # 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' -wd4258 # Suppress ''var' : definition from the for loop is ignored; the definition from the enclosing scope is used' -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' -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' -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 -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)' -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 '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' # 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) append("/W4" msvc_warning_flags) if (LLVM_ENABLE_PEDANTIC) # No MSVC equivalent available endif (LLVM_ENABLE_PEDANTIC) endif (LLVM_ENABLE_WARNINGS) if (LLVM_ENABLE_WERROR) append("/WX" msvc_warning_flags) endif (LLVM_ENABLE_WERROR) foreach(flag ${msvc_warning_flags}) append("${flag}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) endforeach(flag) elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE ) if (LLVM_ENABLE_WARNINGS) append("-Wall -W -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() append_if(LLVM_ENABLE_PEDANTIC "-pedantic -Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 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) # 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. 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) # 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() endif (LLVM_ENABLE_WARNINGS) append_if(LLVM_ENABLE_WERROR "-Werror" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) if (NOT LLVM_ENABLE_TIMESTAMPS) add_flag_if_supported("-Werror=date-time" WERROR_DATE_TIME) endif () if (LLVM_ENABLE_CXX1Y) check_cxx_compiler_flag("-std=c++1y" CXX_SUPPORTS_CXX1Y) append_if(CXX_SUPPORTS_CXX1Y "-std=c++1y" CMAKE_CXX_FLAGS) else() check_cxx_compiler_flag("-std=c++11" CXX_SUPPORTS_CXX11) if (CXX_SUPPORTS_CXX11) if (CYGWIN OR MINGW) # MinGW and Cygwin are a bit stricter and lack things like # 'strdup', 'stricmp', etc in c++11 mode. append("-std=gnu++11" CMAKE_CXX_FLAGS) else() append("-std=c++11" CMAKE_CXX_FLAGS) endif() else() message(FATAL_ERROR "LLVM requires C++11 support but the '-std=c++11' flag isn't supported.") endif() endif() if (LLVM_ENABLE_MODULES) set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fmodules -fcxx-modules") # 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_if(CXX_SUPPORTS_MODULES "-fmodules" CMAKE_C_FLAGS) append_if(CXX_SUPPORTS_MODULES "-fmodules -fcxx-modules" CMAKE_CXX_FLAGS) else() message(FATAL_ERROR "LLVM_ENABLE_MODULES is not supported by this compiler") endif() endif(LLVM_ENABLE_MODULES) 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" 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") add_flag_if_supported("-O1" 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() append("-fsanitize=address" 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" 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 "Address;Undefined" OR LLVM_USE_SANITIZER STREQUAL "Undefined;Address") append_common_sanitizer_flags() append("-fsanitize=address,undefined -fno-sanitize=vptr,function -fno-sanitize-recover" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 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() if (LLVM_USE_SANITIZE_COVERAGE) append("-fsanitize-coverage=4 -mllvm -sanitizer-coverage-8bit-counters=1" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) endif() endif() # Turn on -gsplit-dwarf if requested if(LLVM_USE_SPLIT_DWARF) add_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() # 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 ${CMAKE_SYSTEM_NAME} MATCHES "Darwin") check_c_compiler_flag("-Werror -fno-function-sections" C_SUPPORTS_FNO_FUNCTION_SECTIONS) if (C_SUPPORTS_FNO_FUNCTION_SECTIONS) # Don't add -ffunction-section if it can be disabled with -fno-function-sections. # Doing so will break sanitizers. add_flag_if_supported("-ffunction-sections" FFUNCTION_SECTIONS) endif() add_flag_if_supported("-fdata-sections" FDATA_SECTIONS) endif() endif() if(CYGWIN OR MINGW) # Prune --out-implib from executables. It doesn't make sense even # with --export-all-symbols. string(REGEX REPLACE "-Wl,--out-implib,[^ ]+ " " " CMAKE_C_LINK_EXECUTABLE "${CMAKE_C_LINK_EXECUTABLE}") string(REGEX REPLACE "-Wl,--out-implib,[^ ]+ " " " CMAKE_CXX_LINK_EXECUTABLE "${CMAKE_CXX_LINK_EXECUTABLE}") endif() if(MSVC) # Remove flags here, for exceptions and RTTI. # Each target property or source property should be responsible to control # them. # CL.EXE complains to override flags like "/GR /GR-". string(REGEX REPLACE "(^| ) */EH[-cs]+ *( |$)" "\\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. 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