forked from OSchip/llvm-project
586 lines
25 KiB
CMake
586 lines
25 KiB
CMake
# This CMake module is responsible for interpreting the user defined LLVM_
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# options and executing the appropriate CMake commands to realize the users'
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# selections.
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# This is commonly needed so make sure it's defined before we include anything
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# else.
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string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE)
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include(HandleLLVMStdlib)
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include(AddLLVMDefinitions)
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include(CheckCCompilerFlag)
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include(CheckCXXCompilerFlag)
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if(NOT LLVM_FORCE_USE_OLD_TOOLCHAIN)
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if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
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if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.7)
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message(FATAL_ERROR "Host GCC version must be at least 4.7!")
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endif()
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elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
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if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.1)
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message(FATAL_ERROR "Host Clang version must be at least 3.1!")
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endif()
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if (CMAKE_CXX_SIMULATE_ID MATCHES "MSVC")
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if (CMAKE_CXX_SIMULATE_VERSION VERSION_LESS 18.0)
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message(FATAL_ERROR "Host Clang must have at least -fms-compatibility-version=18.0")
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endif()
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set(CLANG_CL 1)
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elseif(NOT LLVM_ENABLE_LIBCXX)
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# Otherwise, test that we aren't using too old of a version of libstdc++
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# with the Clang compiler. This is tricky as there is no real way to
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# check the version of libstdc++ directly. Instead we test for a known
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# bug in libstdc++4.6 that is fixed in libstdc++4.7.
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set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
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set(OLD_CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
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set(CMAKE_REQUIRED_FLAGS "-std=c++0x")
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check_cxx_source_compiles("
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#include <atomic>
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std::atomic<float> x(0.0f);
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int main() { return (float)x; }"
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LLVM_NO_OLD_LIBSTDCXX)
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if(NOT LLVM_NO_OLD_LIBSTDCXX)
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message(FATAL_ERROR "Host Clang must be able to find libstdc++4.7 or newer!")
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endif()
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set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
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set(CMAKE_REQUIRED_LIBRARIES ${OLD_CMAKE_REQUIRED_LIBRARIES})
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endif()
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elseif(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
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if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 18.0)
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message(FATAL_ERROR "Host Visual Studio must be at least 2013")
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elseif(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 18.0.31101)
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message(WARNING "Host Visual Studio should at least be 2013 Update 4 (MSVC 18.0.31101)"
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" due to miscompiles from earlier versions")
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endif()
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endif()
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endif()
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if( LLVM_ENABLE_ASSERTIONS )
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# MSVC doesn't like _DEBUG on release builds. See PR 4379.
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if( NOT MSVC )
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add_definitions( -D_DEBUG )
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endif()
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# On non-Debug builds cmake automatically defines NDEBUG, so we
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# explicitly undefine it:
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if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" )
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add_definitions( -UNDEBUG )
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# Also remove /D NDEBUG to avoid MSVC warnings about conflicting defines.
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foreach (flags_var_to_scrub
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CMAKE_CXX_FLAGS_RELEASE
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CMAKE_CXX_FLAGS_RELWITHDEBINFO
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CMAKE_CXX_FLAGS_MINSIZEREL
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CMAKE_C_FLAGS_RELEASE
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CMAKE_C_FLAGS_RELWITHDEBINFO
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CMAKE_C_FLAGS_MINSIZEREL)
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string (REGEX REPLACE "(^| )[/-]D *NDEBUG($| )" " "
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"${flags_var_to_scrub}" "${${flags_var_to_scrub}}")
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endforeach()
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endif()
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endif()
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string(TOUPPER "${LLVM_ABI_BREAKING_CHECKS}" uppercase_LLVM_ABI_BREAKING_CHECKS)
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if( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "WITH_ASSERTS" )
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if( LLVM_ENABLE_ASSERTIONS )
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set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 )
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endif()
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elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_ON" )
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set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 )
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elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_OFF" )
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# We don't need to do anything special to turn off ABI breaking checks.
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elseif( NOT DEFINED LLVM_ABI_BREAKING_CHECKS )
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# Treat LLVM_ABI_BREAKING_CHECKS like "FORCE_OFF" when it has not been
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# defined.
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else()
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message(FATAL_ERROR "Unknown value for LLVM_ABI_BREAKING_CHECKS: \"${LLVM_ABI_BREAKING_CHECKS}\"!")
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endif()
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if(WIN32)
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set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)
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if(CYGWIN)
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set(LLVM_ON_WIN32 0)
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set(LLVM_ON_UNIX 1)
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else(CYGWIN)
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set(LLVM_ON_WIN32 1)
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set(LLVM_ON_UNIX 0)
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endif(CYGWIN)
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else(WIN32)
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if(UNIX)
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set(LLVM_ON_WIN32 0)
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set(LLVM_ON_UNIX 1)
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if(APPLE)
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set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)
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else(APPLE)
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set(LLVM_HAVE_LINK_VERSION_SCRIPT 1)
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endif(APPLE)
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else(UNIX)
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MESSAGE(SEND_ERROR "Unable to determine platform")
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endif(UNIX)
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endif(WIN32)
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set(EXEEXT ${CMAKE_EXECUTABLE_SUFFIX})
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set(LTDL_SHLIB_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX})
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# We use *.dylib rather than *.so on darwin.
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set(LLVM_PLUGIN_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX})
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if(APPLE)
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# Darwin-specific linker flags for loadable modules.
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set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-flat_namespace -Wl,-undefined -Wl,suppress")
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endif()
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# Pass -Wl,-z,defs. This makes sure all symbols are defined. Otherwise a DSO
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# build might work on ELF but fail on MachO/COFF.
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if(NOT (${CMAKE_SYSTEM_NAME} MATCHES "Darwin" OR WIN32 OR CYGWIN OR
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${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD") AND
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NOT LLVM_USE_SANITIZER)
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set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,defs")
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endif()
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function(append value)
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foreach(variable ${ARGN})
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set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
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endforeach(variable)
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endfunction()
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function(append_if condition value)
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if (${condition})
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foreach(variable ${ARGN})
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set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
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endforeach(variable)
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endif()
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endfunction()
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macro(add_flag_if_supported flag name)
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check_c_compiler_flag("-Werror ${flag}" "C_SUPPORTS_${name}")
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append_if("C_SUPPORTS_${name}" "${flag}" CMAKE_C_FLAGS)
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check_cxx_compiler_flag("-Werror ${flag}" "CXX_SUPPORTS_${name}")
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append_if("CXX_SUPPORTS_${name}" "${flag}" CMAKE_CXX_FLAGS)
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endmacro()
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function(add_flag_or_print_warning flag name)
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check_c_compiler_flag("-Werror ${flag}" "C_SUPPORTS_${name}")
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check_cxx_compiler_flag("-Werror ${flag}" "CXX_SUPPORTS_${name}")
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if (C_SUPPORTS_${name} AND CXX_SUPPORTS_${name})
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message(STATUS "Building with ${flag}")
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE)
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set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE)
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set(CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} ${flag}" PARENT_SCOPE)
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else()
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message(WARNING "${flag} is not supported.")
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endif()
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endfunction()
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if( LLVM_ENABLE_PIC )
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if( XCODE )
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# Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't
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# know how to disable this, so just force ENABLE_PIC off for now.
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message(WARNING "-fPIC not supported with Xcode.")
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elseif( WIN32 OR CYGWIN)
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# On Windows all code is PIC. MinGW warns if -fPIC is used.
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else()
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add_flag_or_print_warning("-fPIC" FPIC)
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if( WIN32 OR CYGWIN)
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# MinGW warns if -fvisibility-inlines-hidden is used.
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else()
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check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG)
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append_if(SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG "-fvisibility-inlines-hidden" CMAKE_CXX_FLAGS)
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endif()
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endif()
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endif()
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if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
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# TODO: support other platforms and toolchains.
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if( LLVM_BUILD_32_BITS )
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message(STATUS "Building 32 bits executables and libraries.")
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add_llvm_definitions( -m32 )
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set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32")
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set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32")
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set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32")
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endif( LLVM_BUILD_32_BITS )
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endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
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if (LLVM_BUILD_STATIC)
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set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -static")
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endif()
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if( XCODE )
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# For Xcode enable several build settings that correspond to
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# many warnings that are on by default in Clang but are
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# not enabled for historical reasons. For versions of Xcode
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# that do not support these options they will simply
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# be ignored.
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set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_RETURN_TYPE "YES")
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set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_MISSING_NEWLINE "YES")
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set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VALUE "YES")
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set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VARIABLE "YES")
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set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_SIGN_COMPARE "YES")
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set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_FUNCTION "YES")
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set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED "YES")
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set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_HIDDEN_VIRTUAL_FUNCTIONS "YES")
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set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNINITIALIZED_AUTOS "YES")
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set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_BOOL_CONVERSION "YES")
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set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_EMPTY_BODY "YES")
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set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_ENUM_CONVERSION "YES")
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set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_INT_CONVERSION "YES")
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set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_CONSTANT_CONVERSION "YES")
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set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_NON_VIRTUAL_DESTRUCTOR "YES")
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endif()
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# On Win32 using MS tools, provide an option to set the number of parallel jobs
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# to use.
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if( MSVC_IDE )
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set(LLVM_COMPILER_JOBS "0" CACHE STRING
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"Number of parallel compiler jobs. 0 means use all processors. Default is 0.")
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if( NOT LLVM_COMPILER_JOBS STREQUAL "1" )
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if( LLVM_COMPILER_JOBS STREQUAL "0" )
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add_llvm_definitions( /MP )
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else()
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message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS})
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add_llvm_definitions( /MP${LLVM_COMPILER_JOBS} )
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endif()
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else()
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message(STATUS "Parallel compilation disabled")
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endif()
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endif()
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if( MSVC )
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include(ChooseMSVCCRT)
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if( NOT (${CMAKE_VERSION} VERSION_LESS 2.8.11) )
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# set stack reserved size to ~10MB
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# CMake previously automatically set this value for MSVC builds, but the
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# behavior was changed in CMake 2.8.11 (Issue 12437) to use the MSVC default
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# value (1 MB) which is not enough for us in tasks such as parsing recursive
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# C++ templates in Clang.
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set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /STACK:10000000")
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endif()
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if( MSVC11 )
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add_llvm_definitions(-D_VARIADIC_MAX=10)
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endif()
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# Add definitions that make MSVC much less annoying.
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add_llvm_definitions(
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# For some reason MS wants to deprecate a bunch of standard functions...
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-D_CRT_SECURE_NO_DEPRECATE
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-D_CRT_SECURE_NO_WARNINGS
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-D_CRT_NONSTDC_NO_DEPRECATE
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-D_CRT_NONSTDC_NO_WARNINGS
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-D_SCL_SECURE_NO_DEPRECATE
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-D_SCL_SECURE_NO_WARNINGS
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)
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set(msvc_warning_flags
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# Disabled warnings.
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-wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned'
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-wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored'
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-wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data'
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-wd4258 # Suppress ''var' : definition from the for loop is ignored; the definition from the enclosing scope is used'
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-wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data'
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-wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception'
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-wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized'
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-wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized'
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-wd4355 # Suppress ''this' : used in base member initializer list'
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-wd4456 # Suppress 'declaration of 'var' hides local variable'
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-wd4457 # Suppress 'declaration of 'var' hides function parameter'
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-wd4458 # Suppress 'declaration of 'var' hides class member'
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-wd4459 # Suppress 'declaration of 'var' hides global declaration'
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-wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated'
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-wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible'
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-wd4722 # Suppress 'function' : destructor never returns, potential memory leak
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-wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)'
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-wd4100 # Suppress 'unreferenced formal parameter'
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-wd4127 # Suppress 'conditional expression is constant'
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-wd4512 # Suppress 'assignment operator could not be generated'
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-wd4505 # Suppress 'unreferenced local function has been removed'
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-wd4610 # Suppress '<class> can never be instantiated'
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-wd4510 # Suppress 'default constructor could not be generated'
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-wd4702 # Suppress 'unreachable code'
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-wd4245 # Suppress 'signed/unsigned mismatch'
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-wd4706 # Suppress 'assignment within conditional expression'
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-wd4310 # Suppress 'cast truncates constant value'
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-wd4701 # Suppress 'potentially uninitialized local variable'
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-wd4703 # Suppress 'potentially uninitialized local pointer variable'
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-wd4389 # Suppress 'signed/unsigned mismatch'
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-wd4611 # Suppress 'interaction between '_setjmp' and C++ object destruction is non-portable'
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-wd4805 # Suppress 'unsafe mix of type <type> and type <type> in operation'
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-wd4204 # Suppress 'nonstandard extension used : non-constant aggregate initializer'
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-wd4577 # Suppress 'noexcept used with no exception handling mode specified; termination on exception is not guaranteed'
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-wd4091 # Suppress 'typedef: ignored on left of '' when no variable is declared'
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# Ideally, we'd like this warning to be enabled, but MSVC 2013 doesn't
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# support the 'aligned' attribute in the way that clang sources requires (for
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# any code that uses the LLVM_ALIGNAS macro), so this is must be disabled to
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# avoid unwanted alignment warnings.
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# When we switch to requiring a version of MSVC that supports the 'alignas'
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# specifier (MSVC 2015?) this warning can be re-enabled.
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-wd4324 # Suppress 'structure was padded due to __declspec(align())'
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# Promoted warnings.
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-w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning.
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# Promoted warnings to errors.
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-we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error.
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)
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# Enable warnings
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if (LLVM_ENABLE_WARNINGS)
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append("/W4" msvc_warning_flags)
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# CMake appends /W3 by default, and having /W3 followed by /W4 will result in
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# cl : Command line warning D9025 : overriding '/W3' with '/W4'. Since this is
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# a command line warning and not a compiler warning, it cannot be suppressed except
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# by fixing the command line.
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string(REGEX REPLACE " /W[0-4]" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
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string(REGEX REPLACE " /W[0-4]" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
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if (LLVM_ENABLE_PEDANTIC)
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# No MSVC equivalent available
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endif (LLVM_ENABLE_PEDANTIC)
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endif (LLVM_ENABLE_WARNINGS)
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if (LLVM_ENABLE_WERROR)
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append("/WX" msvc_warning_flags)
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endif (LLVM_ENABLE_WERROR)
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foreach(flag ${msvc_warning_flags})
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append("${flag}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
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endforeach(flag)
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append("/Zc:inline" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
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# Disable sized deallocation if the flag is supported. MSVC fails to compile
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# the operator new overload in User otherwise.
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check_c_compiler_flag("/WX /Zc:sizedDealloc-" SUPPORTS_SIZED_DEALLOC)
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append_if(SUPPORTS_SIZED_DEALLOC "/Zc:sizedDealloc-" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
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elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
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if (LLVM_ENABLE_WARNINGS)
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append("-Wall -W -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
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append("-Wcast-qual" CMAKE_CXX_FLAGS)
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# Turn off missing field initializer warnings for gcc to avoid noise from
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# false positives with empty {}. Turn them on otherwise (they're off by
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# default for clang).
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check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
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if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
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if (CMAKE_COMPILER_IS_GNUCXX)
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append("-Wno-missing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
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else()
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append("-Wmissing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
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endif()
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endif()
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append_if(LLVM_ENABLE_PEDANTIC "-pedantic -Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
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add_flag_if_supported("-Wcovered-switch-default" COVERED_SWITCH_DEFAULT_FLAG)
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append_if(USE_NO_UNINITIALIZED "-Wno-uninitialized" CMAKE_CXX_FLAGS)
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append_if(USE_NO_MAYBE_UNINITIALIZED "-Wno-maybe-uninitialized" CMAKE_CXX_FLAGS)
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# Check if -Wnon-virtual-dtor warns even though the class is marked final.
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# If it does, don't add it. So it won't be added on clang 3.4 and older.
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# This also catches cases when -Wnon-virtual-dtor isn't supported by
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# the compiler at all.
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|
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)
|
|
|
|
# Check if -Wcomment is OK with an // comment ending with '\' if the next
|
|
# line is also a // comment.
|
|
set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
|
|
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror -Wcomment")
|
|
CHECK_C_SOURCE_COMPILES("// \\\\\\n//\\nint main() {return 0;}"
|
|
C_WCOMMENT_ALLOWS_LINE_WRAP)
|
|
set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
|
|
if (NOT C_WCOMMENT_ALLOWS_LINE_WRAP)
|
|
append("-Wno-comment" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
|
|
endif()
|
|
endif (LLVM_ENABLE_WARNINGS)
|
|
append_if(LLVM_ENABLE_WERROR "-Werror" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
|
|
if (NOT LLVM_ENABLE_TIMESTAMPS)
|
|
add_flag_if_supported("-Werror=date-time" WERROR_DATE_TIME)
|
|
endif ()
|
|
if (LLVM_ENABLE_CXX1Y)
|
|
check_cxx_compiler_flag("-std=c++1y" CXX_SUPPORTS_CXX1Y)
|
|
append_if(CXX_SUPPORTS_CXX1Y "-std=c++1y" CMAKE_CXX_FLAGS)
|
|
else()
|
|
check_cxx_compiler_flag("-std=c++11" CXX_SUPPORTS_CXX11)
|
|
if (CXX_SUPPORTS_CXX11)
|
|
if (CYGWIN OR MINGW)
|
|
# MinGW and Cygwin are a bit stricter and lack things like
|
|
# 'strdup', 'stricmp', etc in c++11 mode.
|
|
append("-std=gnu++11" CMAKE_CXX_FLAGS)
|
|
else()
|
|
append("-std=c++11" CMAKE_CXX_FLAGS)
|
|
endif()
|
|
else()
|
|
message(FATAL_ERROR "LLVM requires C++11 support but the '-std=c++11' flag isn't supported.")
|
|
endif()
|
|
endif()
|
|
if (LLVM_ENABLE_MODULES)
|
|
set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
|
|
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fmodules -fcxx-modules")
|
|
# Check that we can build code with modules enabled, and that repeatedly
|
|
# including <cassert> still manages to respect NDEBUG properly.
|
|
CHECK_CXX_SOURCE_COMPILES("#undef NDEBUG
|
|
#include <cassert>
|
|
#define NDEBUG
|
|
#include <cassert>
|
|
int main() { assert(this code is not compiled); }"
|
|
CXX_SUPPORTS_MODULES)
|
|
set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
|
|
if (CXX_SUPPORTS_MODULES)
|
|
append_if(CXX_SUPPORTS_MODULES "-fmodules" CMAKE_C_FLAGS)
|
|
append_if(CXX_SUPPORTS_MODULES "-fmodules -fcxx-modules" CMAKE_CXX_FLAGS)
|
|
else()
|
|
message(FATAL_ERROR "LLVM_ENABLE_MODULES is not supported by this compiler")
|
|
endif()
|
|
endif(LLVM_ENABLE_MODULES)
|
|
endif( MSVC )
|
|
|
|
macro(append_common_sanitizer_flags)
|
|
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)
|
|
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()
|
|
|
|
# Turn on sanitizers if necessary.
|
|
if(LLVM_USE_SANITIZER)
|
|
if (LLVM_ON_UNIX)
|
|
if (LLVM_USE_SANITIZER STREQUAL "Address")
|
|
append_common_sanitizer_flags()
|
|
append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
|
|
elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?")
|
|
append_common_sanitizer_flags()
|
|
append("-fsanitize=memory" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
|
|
if(LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins")
|
|
append("-fsanitize-memory-track-origins" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
|
|
endif()
|
|
elseif (LLVM_USE_SANITIZER STREQUAL "Undefined")
|
|
append_common_sanitizer_flags()
|
|
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}")
|
|
endif()
|
|
elseif(MSVC)
|
|
if (LLVM_USE_SANITIZER STREQUAL "Address")
|
|
append_common_sanitizer_flags()
|
|
append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
|
|
else()
|
|
message(WARNING "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.")
|
|
endif()
|
|
if (LLVM_USE_SANITIZE_COVERAGE)
|
|
append("-fsanitize-coverage=edge,indirect-calls,8bit-counters,trace-cmp" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
|
|
endif()
|
|
endif()
|
|
|
|
# Turn on -gsplit-dwarf if requested
|
|
if(LLVM_USE_SPLIT_DWARF)
|
|
add_definitions("-gsplit-dwarf")
|
|
endif()
|
|
|
|
add_llvm_definitions( -D__STDC_CONSTANT_MACROS )
|
|
add_llvm_definitions( -D__STDC_FORMAT_MACROS )
|
|
add_llvm_definitions( -D__STDC_LIMIT_MACROS )
|
|
|
|
# clang doesn't print colored diagnostics when invoked from Ninja
|
|
if (UNIX AND
|
|
CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND
|
|
CMAKE_GENERATOR STREQUAL "Ninja")
|
|
append("-fcolor-diagnostics" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
|
|
endif()
|
|
|
|
# Add flags for add_dead_strip().
|
|
# FIXME: With MSVS, consider compiling with /Gy and linking with /OPT:REF?
|
|
# 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 ${CMAKE_SYSTEM_NAME} MATCHES "Darwin" AND
|
|
NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG")
|
|
check_c_compiler_flag("-Werror -fno-function-sections" C_SUPPORTS_FNO_FUNCTION_SECTIONS)
|
|
if (C_SUPPORTS_FNO_FUNCTION_SECTIONS)
|
|
# Don't add -ffunction-section if it can be disabled with -fno-function-sections.
|
|
# Doing so will break sanitizers.
|
|
add_flag_if_supported("-ffunction-sections" FFUNCTION_SECTIONS)
|
|
endif()
|
|
add_flag_if_supported("-fdata-sections" FDATA_SECTIONS)
|
|
endif()
|
|
endif()
|
|
|
|
if(CYGWIN OR MINGW)
|
|
# Prune --out-implib from executables. It doesn't make sense even
|
|
# with --export-all-symbols.
|
|
string(REGEX REPLACE "-Wl,--out-implib,[^ ]+ " " "
|
|
CMAKE_C_LINK_EXECUTABLE "${CMAKE_C_LINK_EXECUTABLE}")
|
|
string(REGEX REPLACE "-Wl,--out-implib,[^ ]+ " " "
|
|
CMAKE_CXX_LINK_EXECUTABLE "${CMAKE_CXX_LINK_EXECUTABLE}")
|
|
endif()
|
|
|
|
if(MSVC)
|
|
# Remove flags here, for exceptions and RTTI.
|
|
# Each target property or source property should be responsible to control
|
|
# them.
|
|
# CL.EXE complains to override flags like "/GR /GR-".
|
|
string(REGEX REPLACE "(^| ) */EH[-cs]+ *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
|
|
string(REGEX REPLACE "(^| ) */GR-? *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
|
|
endif()
|
|
|
|
# Provide public options to globally control RTTI and EH
|
|
option(LLVM_ENABLE_EH "Enable Exception handling" OFF)
|
|
option(LLVM_ENABLE_RTTI "Enable run time type information" OFF)
|
|
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()
|
|
|
|
# Plugin support
|
|
# FIXME: Make this configurable.
|
|
if(WIN32 OR CYGWIN)
|
|
if(BUILD_SHARED_LIBS)
|
|
set(LLVM_ENABLE_PLUGINS ON)
|
|
else()
|
|
set(LLVM_ENABLE_PLUGINS OFF)
|
|
endif()
|
|
else()
|
|
set(LLVM_ENABLE_PLUGINS ON)
|
|
endif()
|