1 # This CMake module is responsible for interpreting the user defined LLVM_
2 # options and executing the appropriate CMake commands to realize the users'
5 # This is commonly needed so make sure it's defined before we include anything
7 string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE)
9 include(HandleLLVMStdlib)
10 include(AddLLVMDefinitions)
11 include(CheckCCompilerFlag)
12 include(CheckCXXCompilerFlag)
14 if(NOT LLVM_FORCE_USE_OLD_TOOLCHAIN)
15 if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
16 if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.7)
17 message(FATAL_ERROR "Host GCC version must be at least 4.7!")
19 elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
20 if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.1)
21 message(FATAL_ERROR "Host Clang version must be at least 3.1!")
24 # Also test that we aren't using too old of a version of libstdc++ with the
25 # Clang compiler. This is tricky as there is no real way to check the
26 # version of libstdc++ directly. Instead we test for a known bug in
27 # libstdc++4.6 that is fixed in libstdc++4.7.
28 if(NOT LLVM_ENABLE_LIBCXX)
29 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
30 set(OLD_CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
31 set(CMAKE_REQUIRED_FLAGS "-std=c++0x")
32 check_cxx_source_compiles("
34 std::atomic<float> x(0.0f);
35 int main() { return (float)x; }"
36 LLVM_NO_OLD_LIBSTDCXX)
37 if(NOT LLVM_NO_OLD_LIBSTDCXX)
38 message(FATAL_ERROR "Host Clang must be able to find libstdc++4.7 or newer!")
40 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
41 set(CMAKE_REQUIRED_LIBRARIES ${OLD_CMAKE_REQUIRED_LIBRARIES})
43 elseif(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
44 if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 17.0)
45 message(FATAL_ERROR "Host Visual Studio must be at least 2012 (MSVC 17.0)")
50 if( LLVM_ENABLE_ASSERTIONS )
51 # MSVC doesn't like _DEBUG on release builds. See PR 4379.
53 add_definitions( -D_DEBUG )
55 # On non-Debug builds cmake automatically defines NDEBUG, so we
56 # explicitly undefine it:
57 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" )
58 add_definitions( -UNDEBUG )
59 # Also remove /D NDEBUG to avoid MSVC warnings about conflicting defines.
60 foreach (flags_var_to_scrub
61 CMAKE_CXX_FLAGS_RELEASE
62 CMAKE_CXX_FLAGS_RELWITHDEBINFO
63 CMAKE_CXX_FLAGS_MINSIZEREL
65 CMAKE_C_FLAGS_RELWITHDEBINFO
66 CMAKE_C_FLAGS_MINSIZEREL)
67 string (REGEX REPLACE "(^| )[/-]D *NDEBUG($| )" " "
68 "${flags_var_to_scrub}" "${${flags_var_to_scrub}}")
74 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)
87 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)
89 set(LLVM_HAVE_LINK_VERSION_SCRIPT 1)
92 MESSAGE(SEND_ERROR "Unable to determine platform")
96 set(EXEEXT ${CMAKE_EXECUTABLE_SUFFIX})
97 set(LTDL_SHLIB_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX})
99 # We use *.dylib rather than *.so on darwin.
100 set(LLVM_PLUGIN_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX})
103 # Darwin-specific linker flags for loadable modules.
104 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-flat_namespace -Wl,-undefined -Wl,suppress")
107 # Pass -Wl,-z,defs. This makes sure all symbols are defined. Otherwise a DSO
108 # build might work on ELF but fail on MachO/COFF.
109 if(NOT (${CMAKE_SYSTEM_NAME} MATCHES "Darwin" OR WIN32))
110 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,defs")
114 function(append value)
115 foreach(variable ${ARGN})
116 set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
120 function(append_if condition value)
122 foreach(variable ${ARGN})
123 set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
128 macro(add_flag_if_supported flag name)
129 check_c_compiler_flag("-Werror ${flag}" "C_SUPPORTS_${name}")
130 append_if("C_SUPPORTS_${name}" "${flag}" CMAKE_C_FLAGS)
131 check_cxx_compiler_flag("-Werror ${flag}" "CXX_SUPPORTS_${name}")
132 append_if("CXX_SUPPORTS_${name}" "${flag}" CMAKE_CXX_FLAGS)
135 function(add_flag_or_print_warning flag name)
136 check_c_compiler_flag("-Werror ${flag}" "C_SUPPORTS_${name}")
137 check_cxx_compiler_flag("-Werror ${flag}" "CXX_SUPPORTS_${name}")
138 if (C_SUPPORTS_${name} AND CXX_SUPPORTS_${name})
139 message(STATUS "Building with ${flag}")
140 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE)
141 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE)
143 message(WARNING "${flag} is not supported.")
147 if( LLVM_ENABLE_PIC )
149 # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't
150 # know how to disable this, so just force ENABLE_PIC off for now.
151 message(WARNING "-fPIC not supported with Xcode.")
152 elseif( WIN32 OR CYGWIN)
153 # On Windows all code is PIC. MinGW warns if -fPIC is used.
155 add_flag_or_print_warning("-fPIC" FPIC)
158 # MinGW warns if -fvisibility-inlines-hidden is used.
160 check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG)
161 append_if(SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG "-fvisibility-inlines-hidden" CMAKE_CXX_FLAGS)
166 if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
167 # TODO: support other platforms and toolchains.
168 if( LLVM_BUILD_32_BITS )
169 message(STATUS "Building 32 bits executables and libraries.")
170 add_llvm_definitions( -m32 )
171 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32")
172 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32")
173 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32")
174 endif( LLVM_BUILD_32_BITS )
175 endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
177 if (LLVM_BUILD_STATIC)
178 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -static")
182 # For Xcode enable several build settings that correspond to
183 # many warnings that are on by default in Clang but are
184 # not enabled for historical reasons. For versions of Xcode
185 # that do not support these options they will simply
187 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_RETURN_TYPE "YES")
188 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_MISSING_NEWLINE "YES")
189 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VALUE "YES")
190 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VARIABLE "YES")
191 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_SIGN_COMPARE "YES")
192 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_FUNCTION "YES")
193 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED "YES")
194 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_HIDDEN_VIRTUAL_FUNCTIONS "YES")
195 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNINITIALIZED_AUTOS "YES")
196 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_BOOL_CONVERSION "YES")
197 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_EMPTY_BODY "YES")
198 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_ENUM_CONVERSION "YES")
199 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_INT_CONVERSION "YES")
200 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_CONSTANT_CONVERSION "YES")
201 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_NON_VIRTUAL_DESTRUCTOR "YES")
204 # On Win32 using MS tools, provide an option to set the number of parallel jobs
207 set(LLVM_COMPILER_JOBS "0" CACHE STRING
208 "Number of parallel compiler jobs. 0 means use all processors. Default is 0.")
209 if( NOT LLVM_COMPILER_JOBS STREQUAL "1" )
210 if( LLVM_COMPILER_JOBS STREQUAL "0" )
211 add_llvm_definitions( /MP )
213 message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS})
214 add_llvm_definitions( /MP${LLVM_COMPILER_JOBS} )
217 message(STATUS "Parallel compilation disabled")
222 include(ChooseMSVCCRT)
224 if( NOT (${CMAKE_VERSION} VERSION_LESS 2.8.11) )
225 # set stack reserved size to ~10MB
226 # CMake previously automatically set this value for MSVC builds, but the
227 # behavior was changed in CMake 2.8.11 (Issue 12437) to use the MSVC default
228 # value (1 MB) which is not enough for us in tasks such as parsing recursive
229 # C++ templates in Clang.
230 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /STACK:10000000")
234 add_llvm_definitions(-D_VARIADIC_MAX=10)
237 # Add definitions that make MSVC much less annoying.
238 add_llvm_definitions(
239 # For some reason MS wants to deprecate a bunch of standard functions...
240 -D_CRT_SECURE_NO_DEPRECATE
241 -D_CRT_SECURE_NO_WARNINGS
242 -D_CRT_NONSTDC_NO_DEPRECATE
243 -D_CRT_NONSTDC_NO_WARNINGS
244 -D_SCL_SECURE_NO_DEPRECATE
245 -D_SCL_SECURE_NO_WARNINGS
248 -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned'
249 -wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored'
250 -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data'
251 -wd4258 # Suppress ''var' : definition from the for loop is ignored; the definition from the enclosing scope is used'
252 -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data'
253 -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception'
254 -wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized'
255 -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized'
256 -wd4355 # Suppress ''this' : used in base member initializer list'
257 -wd4456 # Suppress 'declaration of 'var' hides local variable'
258 -wd4457 # Suppress 'declaration of 'var' hides function parameter'
259 -wd4458 # Suppress 'declaration of 'var' hides class member'
260 -wd4459 # Suppress 'declaration of 'var' hides global declaration'
261 -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated'
262 -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible'
263 -wd4722 # Suppress 'function' : destructor never returns, potential memory leak
264 -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)'
267 -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning.
269 # Promoted warnings to errors.
270 -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error.
274 if (LLVM_ENABLE_WARNINGS)
275 add_llvm_definitions( /W4 )
276 if (LLVM_ENABLE_PEDANTIC)
277 # No MSVC equivalent available
278 endif (LLVM_ENABLE_PEDANTIC)
279 endif (LLVM_ENABLE_WARNINGS)
280 if (LLVM_ENABLE_WERROR)
281 add_llvm_definitions( /WX )
282 endif (LLVM_ENABLE_WERROR)
283 elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
284 if (LLVM_ENABLE_WARNINGS)
285 append("-Wall -W -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
286 append("-Wcast-qual" CMAKE_CXX_FLAGS)
288 # Turn off missing field initializer warnings for gcc to avoid noise from
289 # false positives with empty {}. Turn them on otherwise (they're off by
290 # default for clang).
291 check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
292 if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
293 if (CMAKE_COMPILER_IS_GNUCXX)
294 append("-Wno-missing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
296 append("-Wmissing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
300 append_if(LLVM_ENABLE_PEDANTIC "-pedantic -Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
301 add_flag_if_supported("-Wcovered-switch-default" COVERED_SWITCH_DEFAULT_FLAG)
302 append_if(USE_NO_UNINITIALIZED "-Wno-uninitialized" CMAKE_CXX_FLAGS)
303 append_if(USE_NO_MAYBE_UNINITIALIZED "-Wno-maybe-uninitialized" CMAKE_CXX_FLAGS)
305 # Check if -Wnon-virtual-dtor warns even though the class is marked final.
306 # If it does, don't add it. So it won't be added on clang 3.4 and older.
307 # This also catches cases when -Wnon-virtual-dtor isn't supported by
308 # the compiler at all.
309 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
310 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++11 -Werror=non-virtual-dtor")
311 CHECK_CXX_SOURCE_COMPILES("class base {public: virtual void anchor();protected: ~base();};
312 class derived final : public base { public: ~derived();};
313 int main() { return 0; }"
314 CXX_WONT_WARN_ON_FINAL_NONVIRTUALDTOR)
315 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
316 append_if(CXX_WONT_WARN_ON_FINAL_NONVIRTUALDTOR
317 "-Wnon-virtual-dtor" CMAKE_CXX_FLAGS)
319 # Check if -Wcomment is OK with an // comment ending with '\' if the next
320 # line is also a // comment.
321 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
322 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror -Wcomment")
323 CHECK_C_SOURCE_COMPILES("// \\\\\\n//\\nint main() {return 0;}"
324 C_WCOMMENT_ALLOWS_LINE_WRAP)
325 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
326 if (NOT C_WCOMMENT_ALLOWS_LINE_WRAP)
327 append("-Wno-comment" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
329 endif (LLVM_ENABLE_WARNINGS)
330 append_if(LLVM_ENABLE_WERROR "-Werror" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
331 if (NOT LLVM_ENABLE_TIMESTAMPS)
332 add_flag_if_supported("-Werror=date-time" WERROR_DATE_TIME)
334 if (LLVM_ENABLE_CXX1Y)
335 check_cxx_compiler_flag("-std=c++1y" CXX_SUPPORTS_CXX1Y)
336 append_if(CXX_SUPPORTS_CXX1Y "-std=c++1y" CMAKE_CXX_FLAGS)
338 check_cxx_compiler_flag("-std=c++11" CXX_SUPPORTS_CXX11)
339 if (CXX_SUPPORTS_CXX11)
341 # MinGW and Cygwin are a bit stricter and lack things like
342 # 'strdup', 'stricmp', etc in c++11 mode.
343 append("-std=gnu++11" CMAKE_CXX_FLAGS)
345 append("-std=c++11" CMAKE_CXX_FLAGS)
348 message(FATAL_ERROR "LLVM requires C++11 support but the '-std=c++11' flag isn't supported.")
351 if (LLVM_ENABLE_MODULES)
352 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
353 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fmodules -fcxx-modules")
354 # Check that we can build code with modules enabled, and that repeatedly
355 # including <cassert> still manages to respect NDEBUG properly.
356 CHECK_CXX_SOURCE_COMPILES("#undef NDEBUG
360 int main() { assert(this code is not compiled); }"
361 CXX_SUPPORTS_MODULES)
362 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
363 if (CXX_SUPPORTS_MODULES)
364 append_if(CXX_SUPPORTS_MODULES "-fmodules" CMAKE_C_FLAGS)
365 append_if(CXX_SUPPORTS_MODULES "-fmodules -fcxx-modules" CMAKE_CXX_FLAGS)
367 message(FATAL_ERROR "LLVM_ENABLE_MODULES is not supported by this compiler")
369 endif(LLVM_ENABLE_MODULES)
372 macro(append_common_sanitizer_flags)
373 # Append -fno-omit-frame-pointer and turn on debug info to get better
375 add_flag_if_supported("-fno-omit-frame-pointer" FNO_OMIT_FRAME_POINTER)
376 if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND
377 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO")
378 add_flag_if_supported("-gline-tables-only" GLINE_TABLES_ONLY)
380 # Use -O1 even in debug mode, otherwise sanitizers slowdown is too large.
381 if (uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG")
382 add_flag_if_supported("-O1" O1)
386 # Turn on sanitizers if necessary.
387 if(LLVM_USE_SANITIZER)
389 if (LLVM_USE_SANITIZER STREQUAL "Address")
390 append_common_sanitizer_flags()
391 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
392 elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?")
393 append_common_sanitizer_flags()
394 append("-fsanitize=memory" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
395 if(LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins")
396 append("-fsanitize-memory-track-origins" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
398 elseif (LLVM_USE_SANITIZER STREQUAL "Undefined")
399 append_common_sanitizer_flags()
400 append("-fsanitize=undefined -fno-sanitize=vptr,function -fno-sanitize-recover"
401 CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
402 elseif (LLVM_USE_SANITIZER STREQUAL "Thread")
403 append_common_sanitizer_flags()
404 append("-fsanitize=thread" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
406 message(WARNING "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}")
409 message(WARNING "LLVM_USE_SANITIZER is not supported on this platform.")
413 # Turn on -gsplit-dwarf if requested
414 if(LLVM_USE_SPLIT_DWARF)
415 add_definitions("-gsplit-dwarf")
418 add_llvm_definitions( -D__STDC_CONSTANT_MACROS )
419 add_llvm_definitions( -D__STDC_FORMAT_MACROS )
420 add_llvm_definitions( -D__STDC_LIMIT_MACROS )
422 # clang doesn't print colored diagnostics when invoked from Ninja
424 CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND
425 CMAKE_GENERATOR STREQUAL "Ninja")
426 append("-fcolor-diagnostics" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
429 # Add flags for add_dead_strip().
430 # FIXME: With MSVS, consider compiling with /Gy and linking with /OPT:REF?
431 # But MinSizeRel seems to add that automatically, so maybe disable these
432 # flags instead if LLVM_NO_DEAD_STRIP is set.
433 if(NOT CYGWIN AND NOT WIN32)
434 if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
435 check_c_compiler_flag("-Werror -fno-function-sections" C_SUPPORTS_FNO_FUNCTION_SECTIONS)
436 if (C_SUPPORTS_FNO_FUNCTION_SECTIONS)
437 # Don't add -ffunction-section if it can be disabled with -fno-function-sections.
438 # Doing so will break sanitizers.
439 add_flag_if_supported("-ffunction-sections" FFUNCTION_SECTIONS)
441 add_flag_if_supported("-fdata-sections" FDATA_SECTIONS)
446 # Prune --out-implib from executables. It doesn't make sense even
447 # with --export-all-symbols.
448 string(REGEX REPLACE "-Wl,--out-implib,[^ ]+ " " "
449 CMAKE_C_LINK_EXECUTABLE "${CMAKE_C_LINK_EXECUTABLE}")
450 string(REGEX REPLACE "-Wl,--out-implib,[^ ]+ " " "
451 CMAKE_CXX_LINK_EXECUTABLE "${CMAKE_CXX_LINK_EXECUTABLE}")
455 # Remove flags here, for exceptions and RTTI.
456 # Each target property or source property should be responsible to control
458 # CL.EXE complains to override flags like "/GR /GR-".
459 string(REGEX REPLACE "(^| ) */EH[-cs]+ *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
460 string(REGEX REPLACE "(^| ) */GR-? *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
463 # Provide public options to globally control RTTI and EH
464 option(LLVM_ENABLE_EH "Enable Exception handling" OFF)
465 option(LLVM_ENABLE_RTTI "Enable run time type information" OFF)
466 if(LLVM_ENABLE_EH AND NOT LLVM_ENABLE_RTTI)
467 message(FATAL_ERROR "Exception handling requires RTTI. You must set LLVM_ENABLE_RTTI to ON")
471 # FIXME: Make this configurable.
473 if(BUILD_SHARED_LIBS)
474 set(LLVM_ENABLE_PLUGINS ON)
476 set(LLVM_ENABLE_PLUGINS OFF)
479 set(LLVM_ENABLE_PLUGINS ON)