1# This CMake module is responsible for interpreting the user defined LLVM_ 2# options and executing the appropriate CMake commands to realize the users' 3# selections. 4 5include(AddLLVMDefinitions) 6include(CheckCCompilerFlag) 7include(CheckCXXCompilerFlag) 8 9if( CMAKE_COMPILER_IS_GNUCXX ) 10 set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON) 11elseif( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" ) 12 set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON) 13endif() 14 15if( LLVM_ENABLE_ASSERTIONS ) 16 # MSVC doesn't like _DEBUG on release builds. See PR 4379. 17 if( NOT MSVC ) 18 add_definitions( -D_DEBUG ) 19 endif() 20 # On non-Debug builds cmake automatically defines NDEBUG, so we 21 # explicitly undefine it: 22 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" ) 23 add_definitions( -UNDEBUG ) 24 # Also remove /D NDEBUG to avoid MSVC warnings about conflicting defines. 25 string (REGEX REPLACE "(^| )[/-]D *NDEBUG($| )" " " 26 CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}") 27 endif() 28else() 29 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" ) 30 if( NOT MSVC_IDE AND NOT XCODE ) 31 add_definitions( -DNDEBUG ) 32 endif() 33 endif() 34endif() 35 36if(WIN32) 37 if(CYGWIN) 38 set(LLVM_ON_WIN32 0) 39 set(LLVM_ON_UNIX 1) 40 else(CYGWIN) 41 set(LLVM_ON_WIN32 1) 42 set(LLVM_ON_UNIX 0) 43 endif(CYGWIN) 44 set(LTDL_SHLIB_EXT ".dll") 45 set(EXEEXT ".exe") 46 # Maximum path length is 160 for non-unicode paths 47 set(MAXPATHLEN 160) 48else(WIN32) 49 if(UNIX) 50 set(LLVM_ON_WIN32 0) 51 set(LLVM_ON_UNIX 1) 52 if(APPLE) 53 set(LTDL_SHLIB_EXT ".dylib") 54 else(APPLE) 55 set(LTDL_SHLIB_EXT ".so") 56 endif(APPLE) 57 set(EXEEXT "") 58 # FIXME: Maximum path length is currently set to 'safe' fixed value 59 set(MAXPATHLEN 2024) 60 else(UNIX) 61 MESSAGE(SEND_ERROR "Unable to determine platform") 62 endif(UNIX) 63endif(WIN32) 64 65function(add_flag_or_print_warning flag) 66 check_c_compiler_flag(${flag} C_SUPPORTS_FLAG) 67 check_cxx_compiler_flag(${flag} CXX_SUPPORTS_FLAG) 68 if (C_SUPPORTS_FLAG AND CXX_SUPPORTS_FLAG) 69 message(STATUS "Building with ${flag}") 70 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE) 71 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE) 72 else() 73 message(WARNING "${flag} is not supported.") 74 endif() 75endfunction() 76 77function(append value) 78 foreach(variable ${ARGN}) 79 set(${variable} "${${variable}} ${value}" PARENT_SCOPE) 80 endforeach(variable) 81endfunction() 82 83function(append_if condition value) 84 if (${condition}) 85 foreach(variable ${ARGN}) 86 set(${variable} "${${variable}} ${value}" PARENT_SCOPE) 87 endforeach(variable) 88 endif() 89endfunction() 90 91macro(add_flag_if_supported flag) 92 check_c_compiler_flag(${flag} C_SUPPORTS_FLAG) 93 append_if(C_SUPPORTS_FLAG "${flag}" CMAKE_C_FLAGS) 94 check_cxx_compiler_flag(${flag} CXX_SUPPORTS_FLAG) 95 append_if(CXX_SUPPORTS_FLAG "${flag}" CMAKE_CXX_FLAGS) 96endmacro() 97 98if( LLVM_ENABLE_PIC ) 99 if( XCODE ) 100 # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't 101 # know how to disable this, so just force ENABLE_PIC off for now. 102 message(WARNING "-fPIC not supported with Xcode.") 103 elseif( WIN32 OR CYGWIN) 104 # On Windows all code is PIC. MinGW warns if -fPIC is used. 105 else() 106 add_flag_or_print_warning("-fPIC") 107 108 if( WIN32 OR CYGWIN) 109 # MinGW warns if -fvisibility-inlines-hidden is used. 110 else() 111 check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG) 112 append_if(SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG "-fvisibility-inlines-hidden" CMAKE_CXX_FLAGS) 113 endif() 114 endif() 115endif() 116 117if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 ) 118 # TODO: support other platforms and toolchains. 119 if( LLVM_BUILD_32_BITS ) 120 message(STATUS "Building 32 bits executables and libraries.") 121 add_llvm_definitions( -m32 ) 122 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32") 123 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32") 124 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32") 125 endif( LLVM_BUILD_32_BITS ) 126endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 ) 127 128# On Win32 using MS tools, provide an option to set the number of parallel jobs 129# to use. 130if( MSVC_IDE ) 131 set(LLVM_COMPILER_JOBS "0" CACHE STRING 132 "Number of parallel compiler jobs. 0 means use all processors. Default is 0.") 133 if( NOT LLVM_COMPILER_JOBS STREQUAL "1" ) 134 if( LLVM_COMPILER_JOBS STREQUAL "0" ) 135 add_llvm_definitions( /MP ) 136 else() 137 if (MSVC10) 138 message(FATAL_ERROR 139 "Due to a bug in CMake only 0 and 1 is supported for " 140 "LLVM_COMPILER_JOBS when generating for Visual Studio 2010") 141 else() 142 message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS}) 143 add_llvm_definitions( /MP${LLVM_COMPILER_JOBS} ) 144 endif() 145 endif() 146 else() 147 message(STATUS "Parallel compilation disabled") 148 endif() 149endif() 150 151if( MSVC ) 152 include(ChooseMSVCCRT) 153 154 if( MSVC10 ) 155 # MSVC 10 will complain about headers in the STL not being exported, but 156 # will not complain in MSVC 11. 157 add_llvm_definitions( 158 -wd4275 # Suppress 'An exported class was derived from a class that was not exported.' 159 ) 160 elseif( MSVC11 ) 161 add_llvm_definitions(-D_VARIADIC_MAX=10) 162 endif() 163 164 # Add definitions that make MSVC much less annoying. 165 add_llvm_definitions( 166 # For some reason MS wants to deprecate a bunch of standard functions... 167 -D_CRT_SECURE_NO_DEPRECATE 168 -D_CRT_SECURE_NO_WARNINGS 169 -D_CRT_NONSTDC_NO_DEPRECATE 170 -D_CRT_NONSTDC_NO_WARNINGS 171 -D_SCL_SECURE_NO_DEPRECATE 172 -D_SCL_SECURE_NO_WARNINGS 173 174 # Disabled warnings. 175 -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned' 176 -wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored' 177 -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data' 178 -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data' 179 -wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized' 180 -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized' 181 -wd4355 # Suppress ''this' : used in base member initializer list' 182 -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated' 183 -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible' 184 -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)' 185 186 # Promoted warnings. 187 -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning. 188 189 # Promoted warnings to errors. 190 -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error. 191 ) 192 193 # Enable warnings 194 if (LLVM_ENABLE_WARNINGS) 195 add_llvm_definitions( /W4 ) 196 if (LLVM_ENABLE_PEDANTIC) 197 # No MSVC equivalent available 198 endif (LLVM_ENABLE_PEDANTIC) 199 endif (LLVM_ENABLE_WARNINGS) 200 if (LLVM_ENABLE_WERROR) 201 add_llvm_definitions( /WX ) 202 endif (LLVM_ENABLE_WERROR) 203elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE ) 204 if (LLVM_ENABLE_WARNINGS) 205 append("-Wall -W -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 206 207 # Turn off missing field initializer warnings for gcc to avoid noise from 208 # false positives with empty {}. Turn them on otherwise (they're off by 209 # default for clang). 210 check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG) 211 if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG) 212 if (CMAKE_COMPILER_IS_GNUCXX) 213 append("-Wno-missing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 214 else() 215 append("-Wmissing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 216 endif() 217 endif() 218 219 append_if(LLVM_ENABLE_PEDANTIC "-pedantic -Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 220 check_cxx_compiler_flag("-Werror -Wcovered-switch-default" CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG) 221 append_if(CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG "-Wcovered-switch-default" CMAKE_CXX_FLAGS) 222 check_c_compiler_flag("-Werror -Wcovered-switch-default" C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG) 223 append_if(C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG "-Wcovered-switch-default" CMAKE_C_FLAGS) 224 append_if(USE_NO_UNINITIALIZED "-Wno-uninitialized" CMAKE_CXX_FLAGS) 225 append_if(USE_NO_MAYBE_UNINITIALIZED "-Wno-maybe-uninitialized" CMAKE_CXX_FLAGS) 226 check_cxx_compiler_flag("-Werror -Wnon-virtual-dtor" CXX_SUPPORTS_NON_VIRTUAL_DTOR_FLAG) 227 append_if(CXX_SUPPORTS_NON_VIRTUAL_DTOR_FLAG "-Wnon-virtual-dtor" CMAKE_CXX_FLAGS) 228 endif (LLVM_ENABLE_WARNINGS) 229 if (LLVM_ENABLE_WERROR) 230 add_llvm_definitions( -Werror ) 231 endif (LLVM_ENABLE_WERROR) 232endif( MSVC ) 233 234macro(append_common_sanitizer_flags) 235 # Append -fno-omit-frame-pointer and turn on debug info to get better 236 # stack traces. 237 add_flag_if_supported("-fno-omit-frame-pointer") 238 if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND 239 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO") 240 add_flag_if_supported("-gline-tables-only") 241 endif() 242endmacro() 243 244# Turn on sanitizers if necessary. 245if(LLVM_USE_SANITIZER) 246 if (LLVM_ON_UNIX) 247 if (LLVM_USE_SANITIZER STREQUAL "Address") 248 append_common_sanitizer_flags() 249 add_flag_or_print_warning("-fsanitize=address") 250 elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?") 251 append_common_sanitizer_flags() 252 add_flag_or_print_warning("-fsanitize=memory") 253 if(LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins") 254 add_flag_or_print_warning("-fsanitize-memory-track-origins") 255 endif() 256 else() 257 message(WARNING "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}") 258 endif() 259 else() 260 message(WARNING "LLVM_USE_SANITIZER is not supported on this platform.") 261 endif() 262endif() 263 264# Turn on -gsplit-dwarf if requested 265if(LLVM_USE_SPLIT_DWARF) 266 add_llvm_definitions("-gsplit-dwarf") 267endif() 268 269add_llvm_definitions( -D__STDC_CONSTANT_MACROS ) 270add_llvm_definitions( -D__STDC_FORMAT_MACROS ) 271add_llvm_definitions( -D__STDC_LIMIT_MACROS ) 272 273# clang doesn't print colored diagnostics when invoked from Ninja 274if (UNIX AND 275 CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND 276 CMAKE_GENERATOR STREQUAL "Ninja") 277 append("-fcolor-diagnostics" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 278endif() 279