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1 2# This function generates a "unique" identifier based on various properties3# given as arguments. The idea is to encode all ABI-affecting properties4# in that identifier, so that we can store ABI information and associate it5# to a specific ABI configuration.6#7# Right now, this is done by using the ABI identifier as the filename containing8# the list of symbols exported by libc++ for that configuration, however we could9# make it more sophisticated if the number of ABI-affecting parameters grew.10function(cxx_abi_list_identifier result triple abi_library abi_version unstable exceptions new_delete_in_libcxx)11 set(abi_properties)12 13 if ("${triple}" MATCHES "darwin")14 # Ignore the major, minor, and patchlevel versions of darwin targets.15 string(REGEX REPLACE "darwin[0-9]+\\.[0-9]+\\.[0-9]+" "darwin" triple "${triple}")16 elseif("${triple}" MATCHES "freebsd")17 # Ignore the major and minor versions of freebsd targets.18 string(REGEX REPLACE "freebsd[0-9]+\\.[0-9]+" "freebsd" triple "${triple}")19 elseif("${triple}" MATCHES "aix")20 # Ignore the V.R.M.F version string of aix targets.21 string(REGEX REPLACE "aix[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+" "aix" triple "${triple}")22 endif()23 list(APPEND abi_properties "${triple}")24 list(APPEND abi_properties "${abi_library}")25 list(APPEND abi_properties "v${abi_version}")26 if (${unstable})27 list(APPEND abi_properties "unstable")28 else()29 list(APPEND abi_properties "stable")30 endif()31 if (${exceptions})32 list(APPEND abi_properties "exceptions")33 else()34 list(APPEND abi_properties "noexceptions")35 endif()36 if (${new_delete_in_libcxx})37 list(APPEND abi_properties "new")38 else()39 list(APPEND abi_properties "nonew")40 endif()41 42 list(JOIN abi_properties "." tmp)43 set(${result} "${tmp}" PARENT_SCOPE)44endfunction()45 46if (CMAKE_CXX_COMPILER_TARGET)47 set(triple "${CMAKE_CXX_COMPILER_TARGET}")48else()49 set(triple "${LLVM_DEFAULT_TARGET_TRIPLE}")50endif()51cxx_abi_list_identifier(abi_list_identifier52 "${triple}"53 "${LIBCXX_CXX_ABI}"54 "${LIBCXX_ABI_VERSION}"55 "${LIBCXX_ABI_UNSTABLE}"56 "${LIBCXX_ENABLE_EXCEPTIONS}"57 "${LIBCXX_ENABLE_NEW_DELETE_DEFINITIONS}"58)59 60if (TARGET cxx_shared)61 set(abi_list_file "${CMAKE_CURRENT_SOURCE_DIR}/${abi_list_identifier}.abilist")62 63 if (EXISTS "${abi_list_file}")64 add_custom_target(check-cxx-abilist65 "${Python3_EXECUTABLE}" "${LIBCXX_SOURCE_DIR}/utils/sym_diff.py"66 --only-stdlib-symbols67 --strict "${abi_list_file}"68 $<TARGET_FILE:cxx_shared>69 DEPENDS cxx_shared70 COMMENT "Testing libc++'s exported symbols against the ABI list")71 else()72 message(STATUS "ABI list file not generated for configuration ${abi_list_identifier}, `check-cxx-abilist` will not be available.")73 endif()74 75 add_custom_target(generate-cxx-abilist76 COMMAND "${Python3_EXECUTABLE}" "${LIBCXX_SOURCE_DIR}/utils/generate_abi_list.py"77 --output "${abi_list_file}"78 "$<TARGET_FILE:cxx_shared>"79 DEPENDS cxx_shared80 COMMENT "Generating the ABI list file for configuration ${abi_list_identifier}")81else()82 message(STATUS "Not building a shared library for libc++ -- the ABI list targets will not be available.")83endif()84