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( MSVC ) 12 set(LLVM_COMPILER_IS_GCC_COMPATIBLE OFF) 13elseif( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" ) 14 set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON) 15endif() 16 17if( LLVM_ENABLE_ASSERTIONS ) 18 # MSVC doesn't like _DEBUG on release builds. See PR 4379. 19 if( NOT MSVC ) 20 add_definitions( -D_DEBUG ) 21 endif() 22 # On non-Debug builds cmake automatically defines NDEBUG, so we 23 # explicitly undefine it: 24 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" ) 25 add_definitions( -UNDEBUG ) 26 # Also remove /D NDEBUG to avoid MSVC warnings about conflicting defines. 27 set(REGEXP_NDEBUG "(^| )[/-]D *NDEBUG($| )") 28 string (REGEX REPLACE "${REGEXP_NDEBUG}" " " 29 CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}") 30 string (REGEX REPLACE "${REGEXP_NDEBUG}" " " 31 CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}") 32 string (REGEX REPLACE "${REGEXP_NDEBUG}" " " 33 CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL}") 34 endif() 35else() 36 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" ) 37 if( NOT MSVC_IDE AND NOT XCODE ) 38 add_definitions( -DNDEBUG ) 39 endif() 40 endif() 41endif() 42 43if(WIN32) 44 if(CYGWIN) 45 set(LLVM_ON_WIN32 0) 46 set(LLVM_ON_UNIX 1) 47 else(CYGWIN) 48 set(LLVM_ON_WIN32 1) 49 set(LLVM_ON_UNIX 0) 50 endif(CYGWIN) 51 set(LTDL_SHLIB_EXT ".dll") 52 set(EXEEXT ".exe") 53 # Maximum path length is 160 for non-unicode paths 54 set(MAXPATHLEN 160) 55else(WIN32) 56 if(UNIX) 57 set(LLVM_ON_WIN32 0) 58 set(LLVM_ON_UNIX 1) 59 if(APPLE) 60 set(LTDL_SHLIB_EXT ".dylib") 61 else(APPLE) 62 set(LTDL_SHLIB_EXT ".so") 63 endif(APPLE) 64 set(EXEEXT "") 65 # FIXME: Maximum path length is currently set to 'safe' fixed value 66 set(MAXPATHLEN 2024) 67 else(UNIX) 68 MESSAGE(SEND_ERROR "Unable to determine platform") 69 endif(UNIX) 70endif(WIN32) 71 72function(add_flag_or_print_warning flag) 73 check_c_compiler_flag(${flag} C_SUPPORTS_FLAG) 74 check_cxx_compiler_flag(${flag} CXX_SUPPORTS_FLAG) 75 if (C_SUPPORTS_FLAG AND CXX_SUPPORTS_FLAG) 76 message(STATUS "Building with ${flag}") 77 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE) 78 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE) 79 else() 80 message(WARNING "${flag} is not supported.") 81 endif() 82endfunction() 83 84function(append value) 85 foreach(variable ${ARGN}) 86 set(${variable} "${${variable}} ${value}" PARENT_SCOPE) 87 endforeach(variable) 88endfunction() 89 90function(append_if condition value) 91 if (${condition}) 92 foreach(variable ${ARGN}) 93 set(${variable} "${${variable}} ${value}" PARENT_SCOPE) 94 endforeach(variable) 95 endif() 96endfunction() 97 98macro(add_flag_if_supported flag) 99 check_c_compiler_flag(${flag} C_SUPPORTS_FLAG) 100 append_if(C_SUPPORTS_FLAG "${flag}" CMAKE_C_FLAGS) 101 check_cxx_compiler_flag(${flag} CXX_SUPPORTS_FLAG) 102 append_if(CXX_SUPPORTS_FLAG "${flag}" CMAKE_CXX_FLAGS) 103endmacro() 104 105if( LLVM_ENABLE_PIC ) 106 if( XCODE ) 107 # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't 108 # know how to disable this, so just force ENABLE_PIC off for now. 109 message(WARNING "-fPIC not supported with Xcode.") 110 elseif( WIN32 OR CYGWIN) 111 # On Windows all code is PIC. MinGW warns if -fPIC is used. 112 else() 113 add_flag_or_print_warning("-fPIC") 114 115 if( WIN32 OR CYGWIN) 116 # MinGW warns if -fvisibility-inlines-hidden is used. 117 else() 118 check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG) 119 append_if(SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG "-fvisibility-inlines-hidden" CMAKE_CXX_FLAGS) 120 endif() 121 endif() 122endif() 123 124if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 ) 125 # TODO: support other platforms and toolchains. 126 if( LLVM_BUILD_32_BITS ) 127 message(STATUS "Building 32 bits executables and libraries.") 128 add_llvm_definitions( -m32 ) 129 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32") 130 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32") 131 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32") 132 endif( LLVM_BUILD_32_BITS ) 133endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 ) 134 135# On Win32 using MS tools, provide an option to set the number of parallel jobs 136# to use. 137if( MSVC_IDE ) 138 set(LLVM_COMPILER_JOBS "0" CACHE STRING 139 "Number of parallel compiler jobs. 0 means use all processors. Default is 0.") 140 if( NOT LLVM_COMPILER_JOBS STREQUAL "1" ) 141 if( LLVM_COMPILER_JOBS STREQUAL "0" ) 142 add_llvm_definitions( /MP ) 143 else() 144 if (MSVC10) 145 message(FATAL_ERROR 146 "Due to a bug in CMake only 0 and 1 is supported for " 147 "LLVM_COMPILER_JOBS when generating for Visual Studio 2010") 148 else() 149 message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS}) 150 add_llvm_definitions( /MP${LLVM_COMPILER_JOBS} ) 151 endif() 152 endif() 153 else() 154 message(STATUS "Parallel compilation disabled") 155 endif() 156endif() 157 158if( MSVC ) 159 include(ChooseMSVCCRT) 160 161 if( NOT (${CMAKE_VERSION} VERSION_LESS 2.8.11) ) 162 # set stack reserved size to ~10MB 163 # CMake previously automatically set this value for MSVC builds, but the 164 # behavior was changed in CMake 2.8.11 (Issue 12437) to use the MSVC default 165 # value (1 MB) which is not enough for us in tasks such as parsing recursive 166 # C++ templates in Clang. 167 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /STACK:10000000") 168 endif() 169 170 if( MSVC10 ) 171 # MSVC 10 will complain about headers in the STL not being exported, but 172 # will not complain in MSVC 11. 173 add_llvm_definitions( 174 -wd4275 # Suppress 'An exported class was derived from a class that was not exported.' 175 ) 176 elseif( MSVC11 ) 177 add_llvm_definitions(-D_VARIADIC_MAX=10) 178 endif() 179 180 # Add definitions that make MSVC much less annoying. 181 add_llvm_definitions( 182 # For some reason MS wants to deprecate a bunch of standard functions... 183 -D_CRT_SECURE_NO_DEPRECATE 184 -D_CRT_SECURE_NO_WARNINGS 185 -D_CRT_NONSTDC_NO_DEPRECATE 186 -D_CRT_NONSTDC_NO_WARNINGS 187 -D_SCL_SECURE_NO_DEPRECATE 188 -D_SCL_SECURE_NO_WARNINGS 189 190 # Disabled warnings. 191 -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned' 192 -wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored' 193 -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data' 194 -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data' 195 -wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized' 196 -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized' 197 -wd4355 # Suppress ''this' : used in base member initializer list' 198 -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated' 199 -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible' 200 -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)' 201 -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception' 202 203 # Promoted warnings. 204 -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning. 205 206 # Promoted warnings to errors. 207 -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error. 208 ) 209 210 # Enable warnings 211 if (LLVM_ENABLE_WARNINGS) 212 add_llvm_definitions( /W4 ) 213 if (LLVM_ENABLE_PEDANTIC) 214 # No MSVC equivalent available 215 endif (LLVM_ENABLE_PEDANTIC) 216 endif (LLVM_ENABLE_WARNINGS) 217 if (LLVM_ENABLE_WERROR) 218 add_llvm_definitions( /WX ) 219 endif (LLVM_ENABLE_WERROR) 220elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE ) 221 if (LLVM_ENABLE_WARNINGS) 222 append("-Wall -W -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 223 224 # Turn off missing field initializer warnings for gcc to avoid noise from 225 # false positives with empty {}. Turn them on otherwise (they're off by 226 # default for clang). 227 check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG) 228 if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG) 229 if (CMAKE_COMPILER_IS_GNUCXX) 230 append("-Wno-missing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 231 else() 232 append("-Wmissing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 233 endif() 234 endif() 235 236 append_if(LLVM_ENABLE_PEDANTIC "-pedantic -Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 237 check_cxx_compiler_flag("-Werror -Wcovered-switch-default" CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG) 238 append_if(CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG "-Wcovered-switch-default" CMAKE_CXX_FLAGS) 239 check_c_compiler_flag("-Werror -Wcovered-switch-default" C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG) 240 append_if(C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG "-Wcovered-switch-default" CMAKE_C_FLAGS) 241 append_if(USE_NO_UNINITIALIZED "-Wno-uninitialized" CMAKE_CXX_FLAGS) 242 append_if(USE_NO_MAYBE_UNINITIALIZED "-Wno-maybe-uninitialized" CMAKE_CXX_FLAGS) 243 check_cxx_compiler_flag("-Werror -Wnon-virtual-dtor" CXX_SUPPORTS_NON_VIRTUAL_DTOR_FLAG) 244 append_if(CXX_SUPPORTS_NON_VIRTUAL_DTOR_FLAG "-Wnon-virtual-dtor" CMAKE_CXX_FLAGS) 245 endif (LLVM_ENABLE_WARNINGS) 246 if (LLVM_ENABLE_WERROR) 247 add_llvm_definitions( -Werror ) 248 endif (LLVM_ENABLE_WERROR) 249endif( MSVC ) 250 251macro(append_common_sanitizer_flags) 252 # Append -fno-omit-frame-pointer and turn on debug info to get better 253 # stack traces. 254 add_flag_if_supported("-fno-omit-frame-pointer") 255 if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND 256 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO") 257 add_flag_if_supported("-gline-tables-only") 258 endif() 259 # Use -O1 even in debug mode, otherwise sanitizers slowdown is too large. 260 if (uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") 261 add_flag_if_supported("-O1") 262 endif() 263endmacro() 264 265# Turn on sanitizers if necessary. 266if(LLVM_USE_SANITIZER) 267 if (LLVM_ON_UNIX) 268 if (LLVM_USE_SANITIZER STREQUAL "Address") 269 append_common_sanitizer_flags() 270 add_flag_or_print_warning("-fsanitize=address") 271 elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?") 272 append_common_sanitizer_flags() 273 add_flag_or_print_warning("-fsanitize=memory") 274 if(LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins") 275 add_flag_or_print_warning("-fsanitize-memory-track-origins") 276 endif() 277 else() 278 message(WARNING "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}") 279 endif() 280 else() 281 message(WARNING "LLVM_USE_SANITIZER is not supported on this platform.") 282 endif() 283endif() 284 285# Turn on -gsplit-dwarf if requested 286if(LLVM_USE_SPLIT_DWARF) 287 add_llvm_definitions("-gsplit-dwarf") 288endif() 289 290add_llvm_definitions( -D__STDC_CONSTANT_MACROS ) 291add_llvm_definitions( -D__STDC_FORMAT_MACROS ) 292add_llvm_definitions( -D__STDC_LIMIT_MACROS ) 293 294# clang doesn't print colored diagnostics when invoked from Ninja 295if (UNIX AND 296 CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND 297 CMAKE_GENERATOR STREQUAL "Ninja") 298 append("-fcolor-diagnostics" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 299endif() 300