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 5 include(AddLLVMDefinitions) 6 include(CheckCCompilerFlag) 7 include(CheckCXXCompilerFlag) 8 9 if( CMAKE_COMPILER_IS_GNUCXX ) 10 set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON) 11 elseif( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" ) 12 set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON) 13 endif() 14 15 if( LLVM_ENABLE_ASSERTIONS ) 16 # MSVC doesn't like _DEBUG on release builds. See PR 4379. 17 if( NOT MSVC ) 18 add_definitions( -D_DEBUG ) 19 endif() 20 # On Release builds cmake automatically defines NDEBUG, so we 21 # explicitly undefine it: 22 if( uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" ) 23 add_definitions( -UNDEBUG ) 24 endif() 25 else() 26 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" ) 27 if( NOT MSVC_IDE AND NOT XCODE ) 28 add_definitions( -DNDEBUG ) 29 endif() 30 endif() 31 endif() 32 33 if(WIN32) 34 if(CYGWIN) 35 set(LLVM_ON_WIN32 0) 36 set(LLVM_ON_UNIX 1) 37 else(CYGWIN) 38 set(LLVM_ON_WIN32 1) 39 set(LLVM_ON_UNIX 0) 40 endif(CYGWIN) 41 set(LTDL_SHLIB_EXT ".dll") 42 set(EXEEXT ".exe") 43 # Maximum path length is 160 for non-unicode paths 44 set(MAXPATHLEN 160) 45 else(WIN32) 46 if(UNIX) 47 set(LLVM_ON_WIN32 0) 48 set(LLVM_ON_UNIX 1) 49 if(APPLE) 50 set(LTDL_SHLIB_EXT ".dylib") 51 else(APPLE) 52 set(LTDL_SHLIB_EXT ".so") 53 endif(APPLE) 54 set(EXEEXT "") 55 # FIXME: Maximum path length is currently set to 'safe' fixed value 56 set(MAXPATHLEN 2024) 57 else(UNIX) 58 MESSAGE(SEND_ERROR "Unable to determine platform") 59 endif(UNIX) 60 endif(WIN32) 61 62 function(add_flag_or_print_warning flag) 63 check_c_compiler_flag(${flag} C_SUPPORTS_${flag}) 64 check_cxx_compiler_flag(${flag} CXX_SUPPORTS_${flag}) 65 if (C_SUPPORTS_${flag} AND CXX_SUPPORTS_${flag}) 66 message(STATUS "Building with ${flag}") 67 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE) 68 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE) 69 else() 70 message(WARNING "${flag} is not supported.") 71 endif() 72 endfunction() 73 74 function(append_if variable value condition) 75 if (${condition}) 76 set(${variable} "${${variable}} ${value}" PARENT_SCOPE) 77 endif() 78 endfunction() 79 80 if( LLVM_ENABLE_PIC ) 81 if( XCODE ) 82 # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't 83 # know how to disable this, so just force ENABLE_PIC off for now. 84 message(WARNING "-fPIC not supported with Xcode.") 85 elseif( WIN32 OR CYGWIN) 86 # On Windows all code is PIC. MinGW warns if -fPIC is used. 87 else() 88 add_flag_or_print_warning("-fPIC") 89 90 if( WIN32 OR CYGWIN) 91 # MinGW warns if -fvisibility-inlines-hidden is used. 92 else() 93 check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG) 94 append_if(CMAKE_CXX_FLAGS "-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG) 95 endif() 96 endif() 97 endif() 98 99 if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 ) 100 # TODO: support other platforms and toolchains. 101 if( LLVM_BUILD_32_BITS ) 102 message(STATUS "Building 32 bits executables and libraries.") 103 add_llvm_definitions( -m32 ) 104 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32") 105 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32") 106 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32") 107 endif( LLVM_BUILD_32_BITS ) 108 endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 ) 109 110 # On Win32 using MS tools, provide an option to set the number of parallel jobs 111 # to use. 112 if( MSVC_IDE ) 113 set(LLVM_COMPILER_JOBS "0" CACHE STRING 114 "Number of parallel compiler jobs. 0 means use all processors. Default is 0.") 115 if( NOT LLVM_COMPILER_JOBS STREQUAL "1" ) 116 if( LLVM_COMPILER_JOBS STREQUAL "0" ) 117 add_llvm_definitions( /MP ) 118 else() 119 if (MSVC10) 120 message(FATAL_ERROR 121 "Due to a bug in CMake only 0 and 1 is supported for " 122 "LLVM_COMPILER_JOBS when generating for Visual Studio 2010") 123 else() 124 message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS}) 125 add_llvm_definitions( /MP${LLVM_COMPILER_JOBS} ) 126 endif() 127 endif() 128 else() 129 message(STATUS "Parallel compilation disabled") 130 endif() 131 endif() 132 133 if( MSVC ) 134 include(ChooseMSVCCRT) 135 136 if( MSVC11 ) 137 add_llvm_definitions(-D_VARIADIC_MAX=10) 138 endif() 139 140 # Add definitions that make MSVC much less annoying. 141 add_llvm_definitions( 142 # For some reason MS wants to deprecate a bunch of standard functions... 143 -D_CRT_SECURE_NO_DEPRECATE 144 -D_CRT_SECURE_NO_WARNINGS 145 -D_CRT_NONSTDC_NO_DEPRECATE 146 -D_CRT_NONSTDC_NO_WARNINGS 147 -D_SCL_SECURE_NO_DEPRECATE 148 -D_SCL_SECURE_NO_WARNINGS 149 150 # Disabled warnings. 151 -wd4065 # Suppress 'switch statement contains 'default' but no 'case' labels' 152 -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned' 153 -wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored' 154 -wd4181 # Suppress 'qualifier applied to reference type; ignored' 155 -wd4224 # Suppress 'nonstandard extension used : formal parameter 'identifier' was previously defined as a type' 156 -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data' 157 -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data' 158 -wd4275 # Suppress 'An exported class was derived from a class that was not exported.' 159 -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception' 160 -wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized' 161 -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized' 162 -wd4355 # Suppress ''this' : used in base member initializer list' 163 -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated' 164 -wd4551 # Suppress 'function call missing argument list' 165 -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible' 166 -wd4715 # Suppress ''function' : not all control paths return a value' 167 -wd4722 # Suppress ''function' : destructor never returns, potential memory leak' 168 -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)' 169 170 # Promoted warnings. 171 -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning. 172 173 # Promoted warnings to errors. 174 -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error. 175 ) 176 177 # Enable warnings 178 if (LLVM_ENABLE_WARNINGS) 179 add_llvm_definitions( /W4 ) 180 if (LLVM_ENABLE_PEDANTIC) 181 # No MSVC equivalent available 182 endif (LLVM_ENABLE_PEDANTIC) 183 endif (LLVM_ENABLE_WARNINGS) 184 if (LLVM_ENABLE_WERROR) 185 add_llvm_definitions( /WX ) 186 endif (LLVM_ENABLE_WERROR) 187 elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE ) 188 if (LLVM_ENABLE_WARNINGS) 189 add_llvm_definitions( -Wall -W -Wno-unused-parameter -Wwrite-strings ) 190 191 # Turn off missing field initializer warnings for gcc to avoid noise from 192 # false positives with empty {}. Turn them on otherwise (they're off by 193 # default for clang). 194 check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG) 195 if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG) 196 if (CMAKE_COMPILER_IS_GNUCXX) 197 add_llvm_definitions( -Wno-missing-field-initializers ) 198 else() 199 add_llvm_definitions( -Wmissing-field-initializers ) 200 endif() 201 endif() 202 203 if (LLVM_ENABLE_PEDANTIC) 204 add_llvm_definitions( -pedantic -Wno-long-long ) 205 endif (LLVM_ENABLE_PEDANTIC) 206 check_cxx_compiler_flag("-Werror -Wcovered-switch-default" CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG) 207 append_if(CMAKE_CXX_FLAGS "-Wcovered-switch-default" CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG) 208 check_c_compiler_flag("-Werror -Wcovered-switch-default" C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG) 209 append_if(CMAKE_C_FLAGS "-Wcovered-switch-default" C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG) 210 append_if(CMAKE_CXX_FLAGS "-Wno-uninitialized" USE_NO_UNINITIALIZED) 211 append_if(CMAKE_CXX_FLAGS "-Wno-maybe-uninitialized" USE_NO_MAYBE_UNINITIALIZED) 212 endif (LLVM_ENABLE_WARNINGS) 213 if (LLVM_ENABLE_WERROR) 214 add_llvm_definitions( -Werror ) 215 endif (LLVM_ENABLE_WERROR) 216 endif( MSVC ) 217 218 add_llvm_definitions( -D__STDC_CONSTANT_MACROS ) 219 add_llvm_definitions( -D__STDC_FORMAT_MACROS ) 220 add_llvm_definitions( -D__STDC_LIMIT_MACROS ) 221