X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=cmake%2Fmodules%2FHandleLLVMOptions.cmake;h=6db258ff66a156f6c611380dcdf693e14a42dd91;hb=12d60e9e7c149a7d333e277dfbe25a720c88c585;hp=87c3b8501422c5d34e5497099d6dba20f8899523;hpb=96c8ba61cb135274da1f6f4a5c71c7638d97f668;p=oota-llvm.git diff --git a/cmake/modules/HandleLLVMOptions.cmake b/cmake/modules/HandleLLVMOptions.cmake index 87c3b850142..6db258ff66a 100644 --- a/cmake/modules/HandleLLVMOptions.cmake +++ b/cmake/modules/HandleLLVMOptions.cmake @@ -21,11 +21,16 @@ if(NOT LLVM_FORCE_USE_OLD_TOOLCHAIN) message(FATAL_ERROR "Host Clang version must be at least 3.1!") endif() - # Also test that we aren't using too old of a version of libstdc++ with the - # Clang compiler. This is tricky as there is no real way to check the - # version of libstdc++ directly. Instead we test for a known bug in - # libstdc++4.6 that is fixed in libstdc++4.7. - if(NOT LLVM_ENABLE_LIBCXX) + 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. This is tricky as there is no real way to + # check the version of libstdc++ directly. Instead we test for a known + # bug in libstdc++4.6 that is fixed in libstdc++4.7. set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) set(OLD_CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES}) set(CMAKE_REQUIRED_FLAGS "-std=c++0x") @@ -41,8 +46,11 @@ int main() { return (float)x; }" set(CMAKE_REQUIRED_LIBRARIES ${OLD_CMAKE_REQUIRED_LIBRARIES}) endif() elseif(CMAKE_CXX_COMPILER_ID MATCHES "MSVC") - if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 17.0) - message(FATAL_ERROR "Host Visual Studio must be at least 2012 (MSVC 17.0)") + if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 18.0) + message(FATAL_ERROR "Host Visual Studio must be at least 2013") + elseif(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 18.0.31101) + message(WARNING "Host Visual Studio should at least be 2013 Update 4 (MSVC 18.0.31101)" + " due to miscompiles from earlier versions") endif() endif() endif() @@ -70,6 +78,23 @@ if( LLVM_ENABLE_ASSERTIONS ) endif() endif() +string(TOUPPER "${LLVM_ABI_BREAKING_CHECKS}" uppercase_LLVM_ABI_BREAKING_CHECKS) + +if( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "WITH_ASSERTS" ) + if( LLVM_ENABLE_ASSERTIONS ) + set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 ) + endif() +elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_ON" ) + set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 ) +elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_OFF" ) + # We don't need to do anything special to turn off ABI breaking checks. +elseif( NOT DEFINED LLVM_ABI_BREAKING_CHECKS ) + # Treat LLVM_ABI_BREAKING_CHECKS like "FORCE_OFF" when it has not been + # defined. +else() + message(FATAL_ERROR "Unknown value for LLVM_ABI_BREAKING_CHECKS: \"${LLVM_ABI_BREAKING_CHECKS}\"!") +endif() + if(WIN32) set(LLVM_HAVE_LINK_VERSION_SCRIPT 0) if(CYGWIN) @@ -79,8 +104,6 @@ if(WIN32) set(LLVM_ON_WIN32 1) set(LLVM_ON_UNIX 0) endif(CYGWIN) - # Maximum path length is 160 for non-unicode paths - set(MAXPATHLEN 160) else(WIN32) if(UNIX) set(LLVM_ON_WIN32 0) @@ -90,8 +113,6 @@ else(WIN32) else(APPLE) set(LLVM_HAVE_LINK_VERSION_SCRIPT 1) endif(APPLE) - # FIXME: Maximum path length is currently set to 'safe' fixed value - set(MAXPATHLEN 2024) else(UNIX) MESSAGE(SEND_ERROR "Unable to determine platform") endif(UNIX) @@ -108,6 +129,16 @@ if(APPLE) set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-flat_namespace -Wl,-undefined -Wl,suppress") endif() +# Pass -Wl,-z,defs. This makes sure all symbols are defined. Otherwise a DSO +# build might work on ELF but fail on MachO/COFF. +if(NOT (${CMAKE_SYSTEM_NAME} MATCHES "Darwin" OR WIN32 OR CYGWIN OR + ${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD" OR + ${CMAKE_SYSTEM_NAME} MATCHES "OpenBSD") AND + NOT LLVM_USE_SANITIZER) + set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,defs") +endif() + + function(append value) foreach(variable ${ARGN}) set(${variable} "${${variable}} ${value}" PARENT_SCOPE) @@ -136,6 +167,7 @@ function(add_flag_or_print_warning flag name) message(STATUS "Building with ${flag}") set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE) set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE) + set(CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} ${flag}" PARENT_SCOPE) else() message(WARNING "${flag} is not supported.") endif() @@ -150,16 +182,15 @@ if( LLVM_ENABLE_PIC ) # On Windows all code is PIC. MinGW warns if -fPIC is used. else() add_flag_or_print_warning("-fPIC" FPIC) - - if( WIN32 OR CYGWIN) - # MinGW warns if -fvisibility-inlines-hidden is used. - else() - check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG) - append_if(SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG "-fvisibility-inlines-hidden" CMAKE_CXX_FLAGS) - endif() endif() endif() +if(NOT WIN32 AND NOT CYGWIN) + # MinGW warns if -fvisibility-inlines-hidden is used. + check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG) + append_if(SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG "-fvisibility-inlines-hidden" CMAKE_CXX_FLAGS) +endif() + if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 ) # TODO: support other platforms and toolchains. if( LLVM_BUILD_32_BITS ) @@ -216,6 +247,12 @@ if( MSVC_IDE ) endif() if( MSVC ) + if( CMAKE_CXX_COMPILER_VERSION VERSION_LESS 19.0 ) + # For MSVC 2013, disable iterator null pointer checking in debug mode, + # especially so std::equal(nullptr, nullptr, nullptr) will not assert. + add_llvm_definitions("-D_DEBUG_POINTER_IMPL=") + endif() + include(ChooseMSVCCRT) if( NOT (${CMAKE_VERSION} VERSION_LESS 2.8.11) ) @@ -240,8 +277,11 @@ if( MSVC ) -D_CRT_NONSTDC_NO_WARNINGS -D_SCL_SECURE_NO_DEPRECATE -D_SCL_SECURE_NO_WARNINGS + ) + set(msvc_warning_flags # Disabled warnings. + -wd4141 # Suppress ''modifier' : used more than once' (because of __forceinline combined with inline) -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' @@ -259,7 +299,36 @@ if( MSVC ) -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 ' 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 and type in operation' + -wd4204 # Suppress 'nonstandard extension used : non-constant aggregate initializer' + -wd4577 # Suppress 'noexcept used with no exception handling mode specified; termination on exception is not guaranteed' + -wd4091 # Suppress 'typedef: ignored on left of '' when no variable is declared' + # C4592 is disabled because of false positives in Visual Studio 2015 + # Update 1. Re-evaluate the usefulness of this diagnostic with Update 2. + -wd4592 # Suppress ''var': symbol will be dynamically initialized (implementation limitation) + + # Ideally, we'd like this warning to be enabled, but MSVC 2013 doesn't + # support the 'aligned' attribute in the way that clang sources requires (for + # any code that uses the LLVM_ALIGNAS macro), so this is must be disabled to + # avoid unwanted alignment warnings. + # When we switch to requiring a version of MSVC that supports the 'alignas' + # specifier (MSVC 2015?) this warning can be re-enabled. + -wd4324 # Suppress 'structure was padded due to __declspec(align())' + # Promoted warnings. -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning. @@ -269,14 +338,66 @@ if( MSVC ) # Enable warnings if (LLVM_ENABLE_WARNINGS) - add_llvm_definitions( /W4 ) + # Put /W4 in front of all the -we flags. cl.exe doesn't care, but for + # clang-cl having /W4 after the -we flags will re-enable the warnings + # disabled by -we. + set(msvc_warning_flags "/W4 ${msvc_warning_flags}") + # CMake appends /W3 by default, and having /W3 followed by /W4 will result in + # cl : Command line warning D9025 : overriding '/W3' with '/W4'. Since this is + # a command line warning and not a compiler warning, it cannot be suppressed except + # by fixing the command line. + string(REGEX REPLACE " /W[0-4]" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}") + string(REGEX REPLACE " /W[0-4]" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") + if (LLVM_ENABLE_PEDANTIC) # No MSVC equivalent available endif (LLVM_ENABLE_PEDANTIC) endif (LLVM_ENABLE_WARNINGS) if (LLVM_ENABLE_WERROR) - add_llvm_definitions( /WX ) + append("/WX" msvc_warning_flags) endif (LLVM_ENABLE_WERROR) + + foreach(flag ${msvc_warning_flags}) + append("${flag}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) + endforeach(flag) + + append("/Zc:inline" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) + + if (NOT LLVM_ENABLE_TIMESTAMPS AND CMAKE_CXX_COMPILER_ID MATCHES "Clang") + # clang-cl and cl by default produce non-deterministic binaries because + # link.exe /incremental requires a timestamp in the .obj file. clang-cl + # has the flag /Brepro to force deterministic binaries, so pass that when + # LLVM_ENABLE_TIMESTAMPS is turned off. + # This checks CMAKE_CXX_COMPILER_ID in addition to check_cxx_compiler_flag() + # because cl.exe does not emit an error on flags it doesn't understand, + # letting check_cxx_compiler_flag() claim it understands all flags. + check_cxx_compiler_flag("/Brepro" SUPPORTS_BREPRO) + append_if(SUPPORTS_BREPRO "/Brepro" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) + + if (SUPPORTS_BREPRO) + # Check if /INCREMENTAL is passed to the linker and complain that it + # won't work with /Brepro. + string(TOUPPER "${CMAKE_EXE_LINKER_FLAGS}" upper_exe_flags) + string(TOUPPER "${CMAKE_MODULE_LINKER_FLAGS}" upper_module_flags) + string(TOUPPER "${CMAKE_SHARED_LINKER_FLAGS}" upper_shared_flags) + + string(FIND "${upper_exe_flags}" "/INCREMENTAL" exe_index) + string(FIND "${upper_module_flags}" "/INCREMENTAL" module_index) + string(FIND "${upper_shared_flags}" "/INCREMENTAL" shared_index) + + if (${exe_index} GREATER -1 OR + ${module_index} GREATER -1 OR + ${shared_index} GREATER -1) + message(FATAL_ERROR "LLVM_ENABLE_TIMESTAMPS not compatible with /INCREMENTAL linking") + endif() + endif() + endif() + + # Disable sized deallocation if the flag is supported. MSVC fails to compile + # the operator new overload in User otherwise. + check_c_compiler_flag("/WX /Zc:sizedDealloc-" SUPPORTS_SIZED_DEALLOC) + append_if(SUPPORTS_SIZED_DEALLOC "/Zc:sizedDealloc-" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) + elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE ) if (LLVM_ENABLE_WARNINGS) append("-Wall -W -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) @@ -294,7 +415,8 @@ elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE ) endif() endif() - append_if(LLVM_ENABLE_PEDANTIC "-pedantic -Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) + append_if(LLVM_ENABLE_PEDANTIC "-pedantic" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) + append_if(LLVM_ENABLE_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) @@ -302,16 +424,23 @@ elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE ) # 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) + # the compiler at all. This flag is not activated for gcc since it will + # incorrectly identify a protected non-virtual base when there is a friend + # declaration. + if (NOT CMAKE_COMPILER_IS_GNUCXX) + 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) + endif() + + # Enable -Wdelete-non-virtual-dtor if available. + add_flag_if_supported("-Wdelete-non-virtual-dtor" DELETE_NON_VIRTUAL_DTOR_FLAG) # Check if -Wcomment is OK with an // comment ending with '\' if the next # line is also a // comment. @@ -347,7 +476,7 @@ elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE ) endif() if (LLVM_ENABLE_MODULES) set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) - set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fmodules -fcxx-modules") + set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fmodules") # Check that we can build code with modules enabled, and that repeatedly # including still manages to respect NDEBUG properly. CHECK_CXX_SOURCE_COMPILES("#undef NDEBUG @@ -367,16 +496,34 @@ elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE ) 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) + if (NOT MSVC) + # 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() + elseif (CLANG_CL) + # Keep frame pointers around. + append("/Oy-" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) + if (CMAKE_LINKER MATCHES "lld-link.exe") + # Use DWARF debug info with LLD. + append("-gdwarf" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) + # Pass /MANIFEST:NO so that CMake doesn't run mt.exe on our binaries. + # Adding manifests with mt.exe breaks LLD's symbol tables. See PR24476. + append("/MANIFEST:NO" + CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) + else() + # Enable codeview otherwise. + append("/Z7" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) + endif() + # Always ask the linker to produce symbols with asan. + append("-debug" CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) endif() endmacro() @@ -394,13 +541,31 @@ if(LLVM_USE_SANITIZER) endif() elseif (LLVM_USE_SANITIZER STREQUAL "Undefined") append_common_sanitizer_flags() - append("-fsanitize=undefined -fno-sanitize=vptr,function -fno-sanitize-recover" + append("-fsanitize=undefined -fno-sanitize=vptr,function -fno-sanitize-recover=all" + 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=all" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) else() - message(WARNING "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}") + message(FATAL_ERROR "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}") + endif() + elseif(MSVC) + if (LLVM_USE_SANITIZER STREQUAL "Address") + append_common_sanitizer_flags() + append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) + else() + message(FATAL_ERROR "This sanitizer not yet supported in the MSVC environment: ${LLVM_USE_SANITIZER}") endif() else() - message(WARNING "LLVM_USE_SANITIZER is not supported on this platform.") + message(FATAL_ERROR "LLVM_USE_SANITIZER is not supported on this platform.") + endif() + if (LLVM_USE_SANITIZE_COVERAGE) + append("-fsanitize-coverage=edge,indirect-calls,8bit-counters,trace-cmp" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) endif() endif() @@ -425,7 +590,8 @@ endif() # 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") + if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin" AND + NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") 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. @@ -461,6 +627,14 @@ if(LLVM_ENABLE_EH AND NOT LLVM_ENABLE_RTTI) message(FATAL_ERROR "Exception handling requires RTTI. You must set LLVM_ENABLE_RTTI to ON") endif() +option(LLVM_BUILD_INSTRUMENTED "Build LLVM and tools with PGO instrumentation (experimental)" Off) +mark_as_advanced(LLVM_BUILD_INSTRUMENTED) +append_if(LLVM_BUILD_INSTRUMENTED "-fprofile-instr-generate" + CMAKE_CXX_FLAGS + CMAKE_C_FLAGS + CMAKE_EXE_LINKER_FLAGS + CMAKE_SHARED_LINKER_FLAGS) + # Plugin support # FIXME: Make this configurable. if(WIN32 OR CYGWIN)