Subversion Repositories QNX 8.QNX8 LLVM/Clang compiler suite

# This CMake module is responsible for interpreting the user defined LLVM_

# options and executing the appropriate CMake commands to realize the users'

# selections.

# This is commonly needed so make sure it's defined before we include anything

# else.

string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE)

include(CheckCompilerVersion)

include(CheckProblematicConfigurations)

include(HandleLLVMStdlib)

include(CheckCCompilerFlag)

include(CheckCXXCompilerFlag)

include(CheckSymbolExists)

include(CMakeDependentOption)

include(LLVMProcessSources)

if(CMAKE_LINKER MATCHES ".*lld" OR (LLVM_USE_LINKER STREQUAL "lld" OR LLVM_ENABLE_LLD))

  set(LINKER_IS_LLD TRUE)

else()

  set(LINKER_IS_LLD FALSE)

endif()

if(CMAKE_LINKER MATCHES "lld-link" OR (MSVC AND (LLVM_USE_LINKER STREQUAL "lld" OR LLVM_ENABLE_LLD)))

  set(LINKER_IS_LLD_LINK TRUE)

else()

  set(LINKER_IS_LLD_LINK FALSE)

endif()

set(LLVM_ENABLE_LTO OFF CACHE STRING "Build LLVM with LTO. May be specified as Thin or Full to use a particular kind of LTO")

string(TOUPPER "${LLVM_ENABLE_LTO}" uppercase_LLVM_ENABLE_LTO)

# Ninja Job Pool support

# The following only works with the Ninja generator in CMake >= 3.0.

set(LLVM_PARALLEL_COMPILE_JOBS "" CACHE STRING

  "Define the maximum number of concurrent compilation jobs (Ninja only).")

if(LLVM_PARALLEL_COMPILE_JOBS)

  if(NOT CMAKE_GENERATOR MATCHES "Ninja")

    message(WARNING "Job pooling is only available with Ninja generators.")

  else()

    set_property(GLOBAL APPEND PROPERTY JOB_POOLS compile_job_pool=${LLVM_PARALLEL_COMPILE_JOBS})

    set(CMAKE_JOB_POOL_COMPILE compile_job_pool)

  endif()

endif()

set(LLVM_PARALLEL_LINK_JOBS "" CACHE STRING

  "Define the maximum number of concurrent link jobs (Ninja only).")

if(CMAKE_GENERATOR MATCHES "Ninja")

  if(NOT LLVM_PARALLEL_LINK_JOBS AND uppercase_LLVM_ENABLE_LTO STREQUAL "THIN")

    message(STATUS "ThinLTO provides its own parallel linking - limiting parallel link jobs to 2.")

    set(LLVM_PARALLEL_LINK_JOBS "2")

  endif()

  if(LLVM_PARALLEL_LINK_JOBS)

    set_property(GLOBAL APPEND PROPERTY JOB_POOLS link_job_pool=${LLVM_PARALLEL_LINK_JOBS})

    set(CMAKE_JOB_POOL_LINK link_job_pool)

  endif()

elseif(LLVM_PARALLEL_LINK_JOBS)

  message(WARNING "Job pooling is only available with Ninja generators.")

endif()

if( LLVM_ENABLE_ASSERTIONS )

  # MSVC doesn't like _DEBUG on release builds. See PR 4379.

  if( NOT MSVC )

    add_compile_definitions(_DEBUG)

  endif()

  # On non-Debug builds cmake automatically defines NDEBUG, so we

  # explicitly undefine it:

  if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" )

    add_compile_options($<$<OR:$<COMPILE_LANGUAGE:C>,$<COMPILE_LANGUAGE:CXX>>:-UNDEBUG>)

    if (MSVC)

      # Also remove /D NDEBUG to avoid MSVC warnings about conflicting defines.

      foreach (flags_var_to_scrub

          CMAKE_CXX_FLAGS_RELEASE

          CMAKE_CXX_FLAGS_RELWITHDEBINFO

          CMAKE_CXX_FLAGS_MINSIZEREL

          CMAKE_C_FLAGS_RELEASE

          CMAKE_C_FLAGS_RELWITHDEBINFO

          CMAKE_C_FLAGS_MINSIZEREL)

        string (REGEX REPLACE "(^| )[/-]D *NDEBUG($| )" " "

          "${flags_var_to_scrub}" "${${flags_var_to_scrub}}")

      endforeach()

    endif()

  endif()

endif()

if(LLVM_ENABLE_EXPENSIVE_CHECKS)

  add_compile_definitions(EXPENSIVE_CHECKS)

  # In some libstdc++ versions, std::min_element is not constexpr when

  # _GLIBCXX_DEBUG is enabled.

  CHECK_CXX_SOURCE_COMPILES("

    #define _GLIBCXX_DEBUG

    #include <algorithm>

    int main(int argc, char** argv) {

      static constexpr int data[] = {0, 1};

      constexpr const int* min_elt = std::min_element(&data[0], &data[2]);

      return 0;

    }" CXX_SUPPORTS_GLIBCXX_DEBUG)

  if(CXX_SUPPORTS_GLIBCXX_DEBUG)

    add_compile_definitions(_GLIBCXX_DEBUG)

  else()

    add_compile_definitions(_GLIBCXX_ASSERTIONS)

  endif()

endif()

if (LLVM_ENABLE_STRICT_FIXED_SIZE_VECTORS)

  add_compile_definitions(STRICT_FIXED_SIZE_VECTORS)

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( LLVM_REVERSE_ITERATION )

  set( LLVM_ENABLE_REVERSE_ITERATION 1 )

endif()

if(WIN32)

  set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)

  if(CYGWIN)

    set(LLVM_ON_WIN32 0)

    set(LLVM_ON_UNIX 1)

  else(CYGWIN)

    set(LLVM_ON_WIN32 1)

    set(LLVM_ON_UNIX 0)

  endif(CYGWIN)

else(WIN32)

  if(FUCHSIA OR UNIX)

    set(LLVM_ON_WIN32 0)

    set(LLVM_ON_UNIX 1)

    if(APPLE OR ${CMAKE_SYSTEM_NAME} MATCHES "AIX")

      set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)

    else()

      set(LLVM_HAVE_LINK_VERSION_SCRIPT 1)

    endif()

  else(FUCHSIA OR UNIX)

    MESSAGE(SEND_ERROR "Unable to determine platform")

  endif(FUCHSIA OR UNIX)

endif(WIN32)

if (CMAKE_SYSTEM_NAME MATCHES "OS390")

  set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)

endif()

set(EXEEXT ${CMAKE_EXECUTABLE_SUFFIX})

set(LTDL_SHLIB_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX})

# We use *.dylib rather than *.so on darwin, but we stick with *.so on AIX.

if(${CMAKE_SYSTEM_NAME} MATCHES "AIX")

  set(LLVM_PLUGIN_EXT ${CMAKE_SHARED_MODULE_SUFFIX})

else()

  set(LLVM_PLUGIN_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX})

endif()

if(APPLE)

  # Darwin-specific linker flags for loadable modules.

  set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-flat_namespace -Wl,-undefined -Wl,suppress")

endif()

if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")

  # RHEL7 has ar and ranlib being non-deterministic by default. The D flag forces determinism,

  # however only GNU version of ar and ranlib (2.27) have this option.

  # RHEL DTS7 is also affected by this, which uses GNU binutils 2.28

  execute_process(COMMAND ${CMAKE_AR} rD t.a

                  WORKING_DIRECTORY ${CMAKE_BINARY_DIR}

                  RESULT_VARIABLE AR_RESULT

                  OUTPUT_QUIET

                  ERROR_QUIET

                  )

  if(${AR_RESULT} EQUAL 0)

    execute_process(COMMAND ${CMAKE_RANLIB} -D t.a

                    WORKING_DIRECTORY ${CMAKE_BINARY_DIR}

                    RESULT_VARIABLE RANLIB_RESULT

                    OUTPUT_QUIET

                    ERROR_QUIET

                    )

    if(${RANLIB_RESULT} EQUAL 0)

      set(CMAKE_C_ARCHIVE_CREATE "<CMAKE_AR> Dqc <TARGET> <LINK_FLAGS> <OBJECTS>"

          CACHE STRING "archive create command")

      set(CMAKE_C_ARCHIVE_APPEND "<CMAKE_AR> Dq  <TARGET> <LINK_FLAGS> <OBJECTS>")

      set(CMAKE_C_ARCHIVE_FINISH "<CMAKE_RANLIB> -D <TARGET>" CACHE STRING "ranlib command")

      set(CMAKE_CXX_ARCHIVE_CREATE "<CMAKE_AR> Dqc <TARGET> <LINK_FLAGS> <OBJECTS>"

          CACHE STRING "archive create command")

      set(CMAKE_CXX_ARCHIVE_APPEND "<CMAKE_AR> Dq  <TARGET> <LINK_FLAGS> <OBJECTS>")

      set(CMAKE_CXX_ARCHIVE_FINISH "<CMAKE_RANLIB> -D <TARGET>" CACHE STRING "ranlib command")

    endif()

    file(REMOVE ${CMAKE_BINARY_DIR}/t.a)

  endif()

endif()

if(${CMAKE_SYSTEM_NAME} MATCHES "AIX")

  # -fPIC does not enable the large code model for GCC on AIX but does for XL.

  if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")

    append("-mcmodel=large" CMAKE_CXX_FLAGS CMAKE_C_FLAGS)

  elseif(CMAKE_CXX_COMPILER_ID MATCHES "XL")

    # XL generates a small number of relocations not of the large model, -bbigtoc is needed.

    append("-Wl,-bbigtoc"

           CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)

    # The default behaviour on AIX processes dynamic initialization of non-local variables with

    # static storage duration even for archive members that are otherwise unreferenced.

    # Since `--whole-archive` is not used by the LLVM build to keep such initializations for Linux,

    # we can limit the processing for archive members to only those that are otherwise referenced.

    append("-bcdtors:mbr"

           CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)

  endif()

  if(BUILD_SHARED_LIBS)

    # See rpath handling in AddLLVM.cmake

    # FIXME: Remove this warning if this rpath is no longer hardcoded.

    message(WARNING "Build and install environment path info may be exposed; binaries will also be unrelocatable.")

  endif()

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|FreeBSD|OpenBSD|DragonFly|AIX|OS390" OR

        WIN32 OR CYGWIN) AND

   NOT LLVM_USE_SANITIZER)

  set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,defs")

endif()

# Pass -Wl,-z,nodelete. This makes sure our shared libraries are not unloaded

# by dlclose(). We need that since the CLI API relies on cross-references

# between global objects which became horribly broken when one of the libraries

# is unloaded.

if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")

  set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,nodelete")

  set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-z,nodelete")

endif()

function(append value)

  foreach(variable ${ARGN})

    set(${variable} "${${variable}} ${value}" PARENT_SCOPE)

  endforeach(variable)

endfunction()

function(append_if condition value)

  if (${condition})

    foreach(variable ${ARGN})

      set(${variable} "${${variable}} ${value}" PARENT_SCOPE)

    endforeach(variable)

  endif()

endfunction()

macro(add_flag_if_supported flag name)

  check_c_compiler_flag("-Werror ${flag}" "C_SUPPORTS_${name}")

  append_if("C_SUPPORTS_${name}" "${flag}" CMAKE_C_FLAGS)

  check_cxx_compiler_flag("-Werror ${flag}" "CXX_SUPPORTS_${name}")

  append_if("CXX_SUPPORTS_${name}" "${flag}" CMAKE_CXX_FLAGS)

endmacro()

function(add_flag_or_print_warning flag name)

  check_c_compiler_flag("-Werror ${flag}" "C_SUPPORTS_${name}")

  check_cxx_compiler_flag("-Werror ${flag}" "CXX_SUPPORTS_${name}")

  if (C_SUPPORTS_${name} AND CXX_SUPPORTS_${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()

endfunction()

function(has_msvc_incremental_no_flag flags incr_no_flag_on)

  set(${incr_no_flag_on} OFF PARENT_SCOPE)

  string(FIND "${flags}" "/INCREMENTAL" idx REVERSE)

  if (${idx} GREATER -1)

    string(SUBSTRING "${flags}" ${idx} 15 no_flag)

    if (${no_flag} MATCHES "/INCREMENTAL:NO")

      set(${incr_no_flag_on} ON PARENT_SCOPE)

    endif()

  endif()

endfunction()

if( LLVM_ENABLE_LLD )

  if ( LLVM_USE_LINKER )

    message(FATAL_ERROR "LLVM_ENABLE_LLD and LLVM_USE_LINKER can't be set at the same time")

  endif()

  # In case of MSVC cmake always invokes the linker directly, so the linker

  # should be specified by CMAKE_LINKER cmake variable instead of by -fuse-ld

  # compiler option.

  if ( MSVC )

    if(NOT CMAKE_LINKER MATCHES "lld-link")

      get_filename_component(CXX_COMPILER_DIR ${CMAKE_CXX_COMPILER} DIRECTORY)

      get_filename_component(C_COMPILER_DIR ${CMAKE_C_COMPILER} DIRECTORY)

      find_program(LLD_LINK NAMES "lld-link" "lld-link.exe" HINTS ${CXX_COMPILER_DIR} ${C_COMPILER_DIR} DOC "lld linker")

      if(NOT LLD_LINK)

        message(FATAL_ERROR

          "LLVM_ENABLE_LLD set, but cannot find lld-link. "

          "Consider setting CMAKE_LINKER to lld-link path.")

      endif()

      set(CMAKE_LINKER ${LLD_LINK})

    endif()

  else()

    set(LLVM_USE_LINKER "lld")

  endif()

endif()

if( LLVM_USE_LINKER )

  append("-fuse-ld=${LLVM_USE_LINKER}"

    CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)

  check_cxx_source_compiles("int main() { return 0; }" CXX_SUPPORTS_CUSTOM_LINKER)

  if ( NOT CXX_SUPPORTS_CUSTOM_LINKER )

    message(FATAL_ERROR "Host compiler does not support '-fuse-ld=${LLVM_USE_LINKER}'")

  endif()

endif()

if( LLVM_ENABLE_PIC )

  if( XCODE )

    # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't

    # know how to disable this, so just force ENABLE_PIC off for now.

    message(WARNING "-fPIC not supported with Xcode.")

  elseif( WIN32 OR CYGWIN)

    # On Windows all code is PIC. MinGW warns if -fPIC is used.

  else()

    add_flag_or_print_warning("-fPIC" FPIC)

    # Enable interprocedural optimizations for non-inline functions which would

    # otherwise be disabled due to GCC -fPIC's default.

    # Note: GCC<10.3 has a bug on SystemZ.

    #

    # Note: Clang allows IPO for -fPIC so this optimization is less effective.

    # Clang 13 has a bug related to -fsanitize-coverage

    # -fno-semantic-interposition (https://reviews.llvm.org/D117183).

    if ((CMAKE_COMPILER_IS_GNUCXX AND

         NOT (LLVM_NATIVE_ARCH STREQUAL "SystemZ" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 10.3))

       OR (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND CMAKE_CXX_COMPILER_VERSION GREATER_EQUAL 14))

      add_flag_if_supported("-fno-semantic-interposition" FNO_SEMANTIC_INTERPOSITION)

    endif()

  endif()

  # GCC for MIPS can miscompile LLVM due to PR37701.

  if(CMAKE_COMPILER_IS_GNUCXX AND LLVM_NATIVE_ARCH STREQUAL "Mips" AND

         NOT Uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG")

    add_flag_or_print_warning("-fno-shrink-wrap" FNO_SHRINK_WRAP)

  endif()

  # gcc with -O3 -fPIC generates TLS sequences that violate the spec on

  # Solaris/sparcv9, causing executables created with the system linker

  # to SEGV (GCC PR target/96607).

  # clang with -O3 -fPIC generates code that SEGVs.

  # Both can be worked around by compiling with -O instead.

  if(${CMAKE_SYSTEM_NAME} STREQUAL "SunOS" AND LLVM_NATIVE_ARCH STREQUAL "Sparc")

    llvm_replace_compiler_option(CMAKE_CXX_FLAGS_RELEASE "-O[23]" "-O")

    llvm_replace_compiler_option(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O[23]" "-O")

  endif()

endif()

if((NOT (${CMAKE_SYSTEM_NAME} MATCHES "AIX")) AND

   (NOT (WIN32 OR CYGWIN) OR (MINGW AND CMAKE_CXX_COMPILER_ID MATCHES "Clang")))

  # GCC for MinGW does nothing about -fvisibility-inlines-hidden, but warns

  # about use of the attributes. As long as we don't use the attributes (to

  # override the default) we shouldn't set the command line options either.

  # GCC on AIX warns if -fvisibility-inlines-hidden is used and Clang on AIX doesn't currently support visibility.

  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 MINGW)

  add_compile_definitions(_FILE_OFFSET_BITS=64)

endif()

if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )

  # TODO: support other platforms and toolchains.

  if( LLVM_BUILD_32_BITS )

    message(STATUS "Building 32 bits executables and libraries.")

    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32")

    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32")

    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32")

    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32")

    set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32")

    # FIXME: CMAKE_SIZEOF_VOID_P is still 8

    add_compile_definitions(_LARGEFILE_SOURCE)

    add_compile_definitions(_FILE_OFFSET_BITS=64)

  endif( LLVM_BUILD_32_BITS )

endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )

# If building on a GNU specific 32-bit system, make sure off_t is 64 bits

# so that off_t can stored offset > 2GB.

# Android until version N (API 24) doesn't support it.

if (ANDROID AND (ANDROID_NATIVE_API_LEVEL LESS 24))

  set(LLVM_FORCE_SMALLFILE_FOR_ANDROID TRUE)

endif()

if( CMAKE_SIZEOF_VOID_P EQUAL 4 AND NOT LLVM_FORCE_SMALLFILE_FOR_ANDROID)

  # FIXME: It isn't handled in LLVM_BUILD_32_BITS.

  add_compile_definitions(_LARGEFILE_SOURCE)

  add_compile_definitions(_FILE_OFFSET_BITS=64)

endif()

if( XCODE )

  # For Xcode enable several build settings that correspond to

  # many warnings that are on by default in Clang but are

  # not enabled for historical reasons.  For versions of Xcode

  # that do not support these options they will simply

  # be ignored.

  set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_RETURN_TYPE "YES")

  set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_MISSING_NEWLINE "YES")

  set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VALUE "YES")

  set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VARIABLE "YES")

  set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_SIGN_COMPARE "YES")

  set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_FUNCTION "YES")

  set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED "YES")

  set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_HIDDEN_VIRTUAL_FUNCTIONS "YES")

  set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNINITIALIZED_AUTOS "YES")

  set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_BOOL_CONVERSION "YES")

  set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_EMPTY_BODY "YES")

  set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_ENUM_CONVERSION "YES")

  set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_INT_CONVERSION "YES")

  set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_CONSTANT_CONVERSION "YES")

  set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_NON_VIRTUAL_DESTRUCTOR "YES")

endif()

# On Win32 using MS tools, provide an option to set the number of parallel jobs

# to use.

if( MSVC_IDE )

  set(LLVM_COMPILER_JOBS "0" CACHE STRING

    "Number of parallel compiler jobs. 0 means use all processors. Default is 0.")

  if( NOT LLVM_COMPILER_JOBS STREQUAL "1" )

    if( LLVM_COMPILER_JOBS STREQUAL "0" )

      add_compile_options(/MP)

    else()

      message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS})

      add_compile_options(/MP${LLVM_COMPILER_JOBS})

    endif()

  else()

    message(STATUS "Parallel compilation disabled")

  endif()

endif()

# set stack reserved size to ~10MB

if(MSVC)

  # CMake previously automatically set this value for MSVC builds, but the

  # behavior was changed in CMake 2.8.11 (Issue 12437) to use the MSVC default

  # value (1 MB) which is not enough for us in tasks such as parsing recursive

  # C++ templates in Clang.

  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /STACK:10000000")

elseif(MINGW) # FIXME: Also cygwin?

  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--stack,16777216")

  # Pass -mbig-obj to mingw gas to avoid COFF 2**16 section limit.

  if (NOT CMAKE_CXX_COMPILER_ID MATCHES "Clang")

    append("-Wa,-mbig-obj" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)

  endif()

endif()

option(LLVM_ENABLE_WARNINGS "Enable compiler warnings." ON)

if( MSVC )

  include(ChooseMSVCCRT)

  # Add definitions that make MSVC much less annoying.

  add_compile_definitions(

    # For some reason MS wants to deprecate a bunch of standard functions...

    _CRT_SECURE_NO_DEPRECATE

    _CRT_SECURE_NO_WARNINGS

    _CRT_NONSTDC_NO_DEPRECATE

    _CRT_NONSTDC_NO_WARNINGS

    _SCL_SECURE_NO_DEPRECATE

    _SCL_SECURE_NO_WARNINGS

    )

  # Tell MSVC to use the Unicode version of the Win32 APIs instead of ANSI.

  add_compile_definitions(

    UNICODE

    _UNICODE

  )

  if (LLVM_WINSYSROOT)

    if (NOT CLANG_CL)

      message(ERROR "LLVM_WINSYSROOT requires clang-cl")

    endif()

    append("/winsysroot${LLVM_WINSYSROOT}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)

  endif()

  if (LLVM_ENABLE_WERROR)

    append("/WX" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)

  endif (LLVM_ENABLE_WERROR)

  append("/Zc:inline" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)

  # Some projects use the __cplusplus preprocessor macro to check support for

  # a particular version of the C++ standard. When this option is not specified

  # explicitly, macro's value is "199711L" that implies C++98 Standard.

  # https://devblogs.microsoft.com/cppblog/msvc-now-correctly-reports-__cplusplus/

  append("/Zc:__cplusplus" CMAKE_CXX_FLAGS)

  # Allow users to request PDBs in release mode. CMake offeres the

  # RelWithDebInfo configuration, but it uses different optimization settings

  # (/Ob1 vs /Ob2 or -O2 vs -O3). LLVM provides this flag so that users can get

  # PDBs without changing codegen.

  option(LLVM_ENABLE_PDB OFF)

  if (LLVM_ENABLE_PDB AND uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE")

    append("/Zi" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)

    # /DEBUG disables linker GC and ICF, but we want those in Release mode.

    append("/DEBUG /OPT:REF /OPT:ICF"

          CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS

          CMAKE_SHARED_LINKER_FLAGS)

  endif()

  # Get all linker flags in upper case form so we can search them.

  string(CONCAT all_linker_flags_uppercase

     ${CMAKE_EXE_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} " "

     ${CMAKE_EXE_LINKER_FLAGS} " "

     ${CMAKE_MODULE_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} " "

     ${CMAKE_MODULE_LINKER_FLAGS} " "

     ${CMAKE_SHARED_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} " "

     ${CMAKE_SHARED_LINKER_FLAGS})

  string(TOUPPER "${all_linker_flags_uppercase}" all_linker_flags_uppercase)

  if (CLANG_CL AND LINKER_IS_LLD)

    # If we are using clang-cl with lld-link and /debug is present in any of the

    # linker flag variables, pass -gcodeview-ghash to the compiler to speed up

    # linking. This flag is orthogonal from /Zi, /Z7, and other flags that

    # enable debug info emission, and only has an effect if those are also in

    # use.

    string(FIND "${all_linker_flags_uppercase}" "/DEBUG" linker_flag_idx)

    if (${linker_flag_idx} GREATER -1)

      add_flag_if_supported("-gcodeview-ghash" GCODEVIEW_GHASH)

    endif()

  endif()

  # "Generate Intrinsic Functions".

  append("/Oi" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)

  if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND NOT LLVM_ENABLE_LTO)

    # 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. We want to pass that

    # whenever you're building with clang unless you're passing /incremental

    # or using LTO (/Brepro with LTO would result in a warning about the flag

    # being unused, because we're not generating object files).

    # 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)

    if (SUPPORTS_BREPRO)

      # Check if /INCREMENTAL is passed to the linker and complain that it

      # won't work with /Brepro.

      has_msvc_incremental_no_flag("${CMAKE_EXE_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${CMAKE_EXE_LINKER_FLAGS}" NO_INCR_EXE)

      has_msvc_incremental_no_flag("${CMAKE_MODULE_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${CMAKE_MODULE_LINKER_FLAGS}" NO_INCR_MODULE)

      has_msvc_incremental_no_flag("${CMAKE_SHARED_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${CMAKE_SHARED_LINKER_FLAGS}" NO_INCR_SHARED)

      if (NO_INCR_EXE AND NO_INCR_MODULE AND NO_INCR_SHARED)

        append("/Brepro" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)

      else()

        message(WARNING "/Brepro not compatible with /INCREMENTAL linking - builds will be non-deterministic")

      endif()

    endif()

  endif()

  # By default MSVC has a 2^16 limit on the number of sections in an object file,

  # but in many objects files need more than that. This flag is to increase the

  # number of sections.

  append("/bigobj" CMAKE_CXX_FLAGS)

  # Enable standards conformance mode.

  # This ensures handling of various C/C++ constructs is more similar to other compilers.

  append("/permissive-" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)

endif( MSVC )

# Warnings-as-errors handling for GCC-compatible compilers:

if ( LLVM_COMPILER_IS_GCC_COMPATIBLE )

  append_if(LLVM_ENABLE_WERROR "-Werror" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)

  append_if(LLVM_ENABLE_WERROR "-Wno-error" CMAKE_REQUIRED_FLAGS)

endif( LLVM_COMPILER_IS_GCC_COMPATIBLE )

# Specific default warnings-as-errors for compilers accepting GCC-compatible warning flags:

if ( LLVM_COMPILER_IS_GCC_COMPATIBLE OR CMAKE_CXX_COMPILER_ID MATCHES "XL" )

  add_flag_if_supported("-Werror=date-time" WERROR_DATE_TIME)

  add_flag_if_supported("-Werror=unguarded-availability-new" WERROR_UNGUARDED_AVAILABILITY_NEW)

endif( LLVM_COMPILER_IS_GCC_COMPATIBLE OR CMAKE_CXX_COMPILER_ID MATCHES "XL" )

# Modules enablement for GCC-compatible compilers:

if ( LLVM_COMPILER_IS_GCC_COMPATIBLE AND LLVM_ENABLE_MODULES )

  set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})

  set(module_flags "-fmodules -fmodules-cache-path=${PROJECT_BINARY_DIR}/module.cache")

  if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")

    # On Darwin -fmodules does not imply -fcxx-modules.

    set(module_flags "${module_flags} -fcxx-modules")

  endif()

  if (LLVM_ENABLE_LOCAL_SUBMODULE_VISIBILITY)

    set(module_flags "${module_flags} -Xclang -fmodules-local-submodule-visibility")

  endif()

  if (LLVM_ENABLE_MODULE_DEBUGGING AND

      ((uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") OR

       (uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO")))

    set(module_flags "${module_flags} -gmodules")

  endif()

  set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${module_flags}")

  # 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("${module_flags}" CMAKE_CXX_FLAGS)

  else()

    message(FATAL_ERROR "LLVM_ENABLE_MODULES is not supported by this compiler")

  endif()

endif( LLVM_COMPILER_IS_GCC_COMPATIBLE AND LLVM_ENABLE_MODULES )

if (MSVC)

  if (NOT CLANG_CL)

    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'

      -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data'

      -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data'

      -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception'

      -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized'

      -wd4456 # Suppress 'declaration of 'var' hides local variable'

      -wd4457 # Suppress 'declaration of 'var' hides function parameter'

      -wd4458 # Suppress 'declaration of 'var' hides class member'

      -wd4459 # Suppress 'declaration of 'var' hides global declaration'

      -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated'

      -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

      -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 '<class> can never be instantiated'

      -wd4510 # Suppress 'default constructor could not be generated'

      -wd4702 # Suppress 'unreachable code'

      -wd4245 # Suppress ''conversion' : conversion from 'type1' to 'type2', 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 <type> and type <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)

      -wd4319 # Suppress ''operator' : zero extending 'type' to 'type' of greater size'

          # C4709 is disabled because of a bug with Visual Studio 2017 as of

          # v15.8.8. Re-evaluate the usefulness of this diagnostic when the bug

          # is fixed.

      -wd4709 # Suppress comma operator within array index expression

      # Ideally, we'd like this warning to be enabled, but even MSVC 2019 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.

      -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.

      # Promoted warnings to errors.

      -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error.

      )

  endif(NOT CLANG_CL)

  # Enable warnings

  if (LLVM_ENABLE_WARNINGS)

    # 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)

  foreach(flag ${msvc_warning_flags})

    append("${flag}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)

  endforeach(flag)

endif (MSVC)

if (LLVM_ENABLE_WARNINGS AND (LLVM_COMPILER_IS_GCC_COMPATIBLE OR CLANG_CL))

  # Don't add -Wall for clang-cl, because it maps -Wall to -Weverything for

  # MSVC compatibility.  /W4 is added above instead.

  if (NOT CLANG_CL)

    append("-Wall" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)

  endif()

  append("-Wextra -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)

  append("-Wcast-qual" CMAKE_CXX_FLAGS)

  # Turn off missing field initializer warnings for gcc to avoid noise from

  # false positives with empty {}. Turn them on otherwise (they're off by

  # default for clang).

  check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)

  if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)

    if (CMAKE_COMPILER_IS_GNUCXX)

      append("-Wno-missing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)

    else()

      append("-Wmissing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)

    endif()

  endif()

  if (LLVM_ENABLE_PEDANTIC AND LLVM_COMPILER_IS_GCC_COMPATIBLE)

    append("-pedantic" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)

    append("-Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)

    # GCC warns about redundant toplevel semicolons (enabled by -pedantic

    # above), while Clang doesn't. Enable the corresponding Clang option to

    # pick up on these even in builds with Clang.

    add_flag_if_supported("-Wc++98-compat-extra-semi" CXX98_COMPAT_EXTRA_SEMI_FLAG)

  endif()

  add_flag_if_supported("-Wimplicit-fallthrough" IMPLICIT_FALLTHROUGH_FLAG)

  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)

  # Disable -Wclass-memaccess, a C++-only warning from GCC 8 that fires on

  # LLVM's ADT classes.

  check_cxx_compiler_flag("-Wclass-memaccess" CXX_SUPPORTS_CLASS_MEMACCESS_FLAG)

  append_if(CXX_SUPPORTS_CLASS_MEMACCESS_FLAG "-Wno-class-memaccess" CMAKE_CXX_FLAGS)

  # Disable -Wredundant-move and -Wpessimizing-move on GCC>=9. GCC wants to

  # remove std::move in code like "A foo(ConvertibleToA a) {

  # return std::move(a); }", but this code does not compile (or uses the copy

  # constructor instead) on clang<=3.8. Clang also has a -Wredundant-move and

  # -Wpessimizing-move, but they only fire when the types match exactly, so we

  # can keep them here.

  if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")

    check_cxx_compiler_flag("-Wredundant-move" CXX_SUPPORTS_REDUNDANT_MOVE_FLAG)

    append_if(CXX_SUPPORTS_REDUNDANT_MOVE_FLAG "-Wno-redundant-move" CMAKE_CXX_FLAGS)

    check_cxx_compiler_flag("-Wpessimizing-move" CXX_SUPPORTS_PESSIMIZING_MOVE_FLAG)

    append_if(CXX_SUPPORTS_PESSIMIZING_MOVE_FLAG "-Wno-pessimizing-move" CMAKE_CXX_FLAGS)

  endif()

  # The LLVM libraries have no stable C++ API, so -Wnoexcept-type is not useful.

  check_cxx_compiler_flag("-Wnoexcept-type" CXX_SUPPORTS_NOEXCEPT_TYPE_FLAG)

  append_if(CXX_SUPPORTS_NOEXCEPT_TYPE_FLAG "-Wno-noexcept-type" CMAKE_CXX_FLAGS)

  # Check if -Wnon-virtual-dtor warns for a class marked final, when it has a

  # friend declaration. If it does, don't add -Wnon-virtual-dtor. The case is

  # considered unhelpful (https://gcc.gnu.org/PR102168).

  set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})

  set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror=non-virtual-dtor")

  CHECK_CXX_SOURCE_COMPILES("class f {};

                             class base {friend f; public: virtual void anchor();protected: ~base();};

                             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)

  append("-Wdelete-non-virtual-dtor" CMAKE_CXX_FLAGS)

  # Enable -Wsuggest-override if it's available, and only if it doesn't

  # suggest adding 'override' to functions that are already marked 'final'

  # (which means it is disabled for GCC < 9.2).

  check_cxx_compiler_flag("-Wsuggest-override" CXX_SUPPORTS_SUGGEST_OVERRIDE_FLAG)

  if (CXX_SUPPORTS_SUGGEST_OVERRIDE_FLAG)

    set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})

    set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror=suggest-override")

    CHECK_CXX_SOURCE_COMPILES("class base {public: virtual void anchor();};

                               class derived : base {public: void anchor() final;};

                               int main() { return 0; }"

                              CXX_WSUGGEST_OVERRIDE_ALLOWS_ONLY_FINAL)

    set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})

    append_if(CXX_WSUGGEST_OVERRIDE_ALLOWS_ONLY_FINAL "-Wsuggest-override" CMAKE_CXX_FLAGS)

  endif()

  # 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(void) {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()

  # Enable -Wstring-conversion to catch misuse of string literals.

  add_flag_if_supported("-Wstring-conversion" STRING_CONVERSION_FLAG)

  if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")