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|
if (NOT IS_DIRECTORY "${CMAKE_CURRENT_LIST_DIR}/../libcxx")
message(FATAL_ERROR "libunwind requires being built in a monorepo layout with libcxx available")
endif()
#===============================================================================
# Setup Project
#===============================================================================
cmake_minimum_required(VERSION 3.13.4)
set(LLVM_COMMON_CMAKE_UTILS "${CMAKE_CURRENT_SOURCE_DIR}/../cmake")
# Add path for custom modules
list(INSERT CMAKE_MODULE_PATH 0
"${CMAKE_CURRENT_SOURCE_DIR}/cmake"
"${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules"
"${LLVM_COMMON_CMAKE_UTILS}"
"${LLVM_COMMON_CMAKE_UTILS}/Modules"
)
set(LIBUNWIND_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
set(LIBUNWIND_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})
set(LIBUNWIND_LIBCXX_PATH "${CMAKE_CURRENT_LIST_DIR}/../libcxx" CACHE PATH
"Specify path to libc++ source.")
if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR LIBUNWIND_STANDALONE_BUILD)
message(FATAL_ERROR "The Standalone build has been deprecated since LLVM 14, and it is not supported anymore. "
"Please use one of the ways described at https://libcxx.llvm.org/BuildingLibcxx.html for "
"building libunwind.")
# We may have an incomplete toolchain - do language support tests without
# linking.
include(EnableLanguageNolink)
project(libunwind LANGUAGES NONE)
set(PACKAGE_NAME libunwind)
set(PACKAGE_VERSION 15.0.0git)
set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
set(PACKAGE_BUGREPORT "llvm-bugs@lists.llvm.org")
set(LIBUNWIND_STANDALONE_BUILD TRUE)
endif()
# Must go below project(..)
include(GNUInstallDirs)
if(LIBUNWIND_STANDALONE_BUILD)
llvm_enable_language_nolink(C CXX ASM)
# Find the LLVM sources and simulate LLVM CMake options.
include(HandleOutOfTreeLLVM)
# In a standalone build, we don't have llvm to automatically generate the
# llvm-lit script for us. So we need to provide an explicit directory that
# the configurator should write the script into.
set(LLVM_LIT_OUTPUT_DIR "${LIBUNWIND_BINARY_DIR}/bin")
else()
set(LLVM_LIT "${CMAKE_SOURCE_DIR}/utils/lit/lit.py")
endif()
#===============================================================================
# Setup CMake Options
#===============================================================================
include(CMakeDependentOption)
include(HandleCompilerRT)
# Define options.
option(LIBUNWIND_BUILD_32_BITS "Build 32 bit multilib libunwind. This option is not supported anymore when building the runtimes. Please specify a full triple instead." ${LLVM_BUILD_32_BITS})
if (LIBUNWIND_BUILD_32_BITS)
message(FATAL_ERROR "LIBUNWIND_BUILD_32_BITS is not supported anymore when building the runtimes, please specify a full triple instead.")
endif()
option(LIBUNWIND_ENABLE_CET "Build libunwind with CET enabled." OFF)
option(LIBUNWIND_ENABLE_ASSERTIONS "Enable assertions independent of build mode." ON)
option(LIBUNWIND_ENABLE_PEDANTIC "Compile with pedantic enabled." ON)
option(LIBUNWIND_ENABLE_WERROR "Fail and stop if a warning is triggered." OFF)
option(LIBUNWIND_ENABLE_SHARED "Build libunwind as a shared library." ON)
option(LIBUNWIND_ENABLE_STATIC "Build libunwind as a static library." ON)
option(LIBUNWIND_ENABLE_CROSS_UNWINDING "Enable cross-platform unwinding support." OFF)
option(LIBUNWIND_ENABLE_ARM_WMMX "Enable unwinding support for ARM WMMX registers." OFF)
option(LIBUNWIND_ENABLE_THREADS "Build libunwind with threading support." ON)
option(LIBUNWIND_WEAK_PTHREAD_LIB "Use weak references to refer to pthread functions." OFF)
option(LIBUNWIND_USE_COMPILER_RT "Use compiler-rt instead of libgcc" OFF)
option(LIBUNWIND_INCLUDE_DOCS "Build the libunwind documentation." ${LLVM_INCLUDE_DOCS})
option(LIBUNWIND_INCLUDE_TESTS "Build the libunwind tests." ${LLVM_INCLUDE_TESTS})
option(LIBUNWIND_IS_BAREMETAL "Build libunwind for baremetal targets." OFF)
option(LIBUNWIND_USE_FRAME_HEADER_CACHE "Cache frame headers for unwinding. Requires locking dl_iterate_phdr." OFF)
option(LIBUNWIND_REMEMBER_HEAP_ALLOC "Use heap instead of the stack for .cfi_remember_state." OFF)
option(LIBUNWIND_INSTALL_HEADERS "Install the libunwind headers." OFF)
set(LIBUNWIND_LIBDIR_SUFFIX "${LLVM_LIBDIR_SUFFIX}" CACHE STRING
"Define suffix of library directory name (32/64)")
option(LIBUNWIND_INSTALL_LIBRARY "Install the libunwind library." ON)
cmake_dependent_option(LIBUNWIND_INSTALL_STATIC_LIBRARY
"Install the static libunwind library." ON
"LIBUNWIND_ENABLE_STATIC;LIBUNWIND_INSTALL_LIBRARY" OFF)
cmake_dependent_option(LIBUNWIND_INSTALL_SHARED_LIBRARY
"Install the shared libunwind library." ON
"LIBUNWIND_ENABLE_SHARED;LIBUNWIND_INSTALL_LIBRARY" OFF)
set(LIBUNWIND_TEST_LINKER_FLAGS "" CACHE STRING
"Additional linker flags for test programs.")
set(LIBUNWIND_TEST_COMPILER_FLAGS "" CACHE STRING
"Additional compiler flags for test programs.")
# TODO: Remove this after branching for LLVM 15
if(LIBUNWIND_SYSROOT OR LIBUNWIND_TARGET_TRIPLE OR LIBUNWIND_GCC_TOOLCHAIN)
message(WARNING "LIBUNWIND_SYSROOT, LIBUNWIND_TARGET_TRIPLE and LIBUNWIND_GCC_TOOLCHAIN are not supported anymore, please use the native CMake equivalents instead")
endif()
if (LIBUNWIND_ENABLE_SHARED)
set(LIBUNWIND_DEFAULT_TEST_CONFIG "llvm-libunwind-shared.cfg.in")
else()
set(LIBUNWIND_DEFAULT_TEST_CONFIG "llvm-libunwind-static.cfg.in")
endif()
set(LIBUNWIND_TEST_CONFIG "${LIBUNWIND_DEFAULT_TEST_CONFIG}" CACHE STRING
"The path to the Lit testing configuration to use when running the tests.
If a relative path is provided, it is assumed to be relative to '<monorepo>/libunwind/test/configs'.")
if (NOT IS_ABSOLUTE "${LIBUNWIND_TEST_CONFIG}")
set(LIBUNWIND_TEST_CONFIG "${CMAKE_CURRENT_SOURCE_DIR}/test/configs/${LIBUNWIND_TEST_CONFIG}")
endif()
set(LIBUNWIND_TEST_PARAMS "" CACHE STRING
"A list of parameters to run the Lit test suite with.")
if (NOT LIBUNWIND_ENABLE_SHARED AND NOT LIBUNWIND_ENABLE_STATIC)
message(FATAL_ERROR "libunwind must be built as either a shared or static library.")
endif()
if (LIBUNWIND_ENABLE_CET AND MSVC)
message(FATAL_ERROR "libunwind CET support is not available for MSVC!")
endif()
option(LIBUNWIND_HIDE_SYMBOLS
"Do not export any symbols from the static library." OFF)
#===============================================================================
# Configure System
#===============================================================================
# Add path for custom modules
set(CMAKE_MODULE_PATH
"${CMAKE_CURRENT_SOURCE_DIR}/cmake"
${CMAKE_MODULE_PATH})
set(LIBUNWIND_INSTALL_INCLUDE_DIR "${CMAKE_INSTALL_INCLUDEDIR}" CACHE PATH
"Path where built libunwind headers should be installed.")
set(LIBUNWIND_INSTALL_RUNTIME_DIR "${CMAKE_INSTALL_BINDIR}" CACHE PATH
"Path where built libunwind runtime libraries should be installed.")
if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
set(LIBUNWIND_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${LLVM_DEFAULT_TARGET_TRIPLE})
set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE} CACHE PATH
"Path where built libunwind libraries should be installed.")
if(LIBCXX_LIBDIR_SUBDIR)
string(APPEND LIBUNWIND_LIBRARY_DIR /${LIBUNWIND_LIBDIR_SUBDIR})
string(APPEND LIBUNWIND_INSTALL_LIBRARY_DIR /${LIBUNWIND_LIBDIR_SUBDIR})
endif()
else()
if(LLVM_LIBRARY_OUTPUT_INTDIR)
set(LIBUNWIND_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
else()
set(LIBUNWIND_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBUNWIND_LIBDIR_SUFFIX})
endif()
set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LIBUNWIND_LIBDIR_SUFFIX} CACHE PATH
"Path where built libunwind libraries should be installed.")
endif()
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${LIBUNWIND_LIBRARY_DIR})
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${LIBUNWIND_LIBRARY_DIR})
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${LIBUNWIND_LIBRARY_DIR})
set(LIBUNWIND_C_FLAGS "")
set(LIBUNWIND_CXX_FLAGS "")
set(LIBUNWIND_COMPILE_FLAGS "")
set(LIBUNWIND_LINK_FLAGS "")
# Include macros for adding and removing libunwind flags.
include(HandleLibunwindFlags)
#===============================================================================
# Setup Compiler Flags
#===============================================================================
# Compiler tests may be failing if the compiler implicitly links in libunwind,
# which doesn't exist yet. This gets waived by --unwindlib=none
# later in config-ix below, but the tests for --target etc before that may
# be failing due to it. Only test compilation, not linking, for these
# tests here now.
set(CMAKE_TRY_COMPILE_TARGET_TYPE_ORIG ${CMAKE_TRY_COMPILE_TARGET_TYPE})
set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
set(CMAKE_TRY_COMPILE_TARGET_TYPE ${CMAKE_TRY_COMPILE_TARGET_TYPE_ORIG})
# Configure compiler.
include(config-ix)
if (LIBUNWIND_USE_COMPILER_RT AND NOT LIBUNWIND_HAS_NODEFAULTLIBS_FLAG)
list(APPEND LIBUNWIND_LINK_FLAGS "-rtlib=compiler-rt")
endif()
add_compile_flags_if_supported(-Werror=return-type)
if (LIBUNWIND_ENABLE_CET)
add_compile_flags_if_supported(-fcf-protection=full)
add_compile_flags_if_supported(-mshstk)
if (NOT LIBUNWIND_SUPPORTS_FCF_PROTECTION_EQ_FULL_FLAG)
message(SEND_ERROR "Compiler doesn't support CET -fcf-protection option!")
endif()
if (NOT LIBUNWIND_SUPPORTS_MSHSTK_FLAG)
message(SEND_ERROR "Compiler doesn't support CET -mshstk option!")
endif()
endif()
# Get warning flags
add_compile_flags_if_supported(-W)
add_compile_flags_if_supported(-Wall)
add_compile_flags_if_supported(-Wchar-subscripts)
add_compile_flags_if_supported(-Wconversion)
add_compile_flags_if_supported(-Wmismatched-tags)
add_compile_flags_if_supported(-Wmissing-braces)
add_compile_flags_if_supported(-Wnewline-eof)
add_compile_flags_if_supported(-Wno-unused-function)
add_compile_flags_if_supported(-Wshadow)
add_compile_flags_if_supported(-Wshorten-64-to-32)
add_compile_flags_if_supported(-Wsign-compare)
add_compile_flags_if_supported(-Wsign-conversion)
add_compile_flags_if_supported(-Wstrict-aliasing=2)
add_compile_flags_if_supported(-Wstrict-overflow=4)
add_compile_flags_if_supported(-Wunused-parameter)
add_compile_flags_if_supported(-Wunused-variable)
add_compile_flags_if_supported(-Wwrite-strings)
add_compile_flags_if_supported(-Wundef)
add_compile_flags_if_supported(-Wno-suggest-override)
if (WIN32)
# The headers lack matching dllexport attributes (_LIBUNWIND_EXPORT);
# silence the warning instead of cluttering the headers (which aren't
# necessarily the ones that the callers will use anyway) with the
# attributes.
add_compile_flags_if_supported(-Wno-dll-attribute-on-redeclaration)
endif()
if (LIBUNWIND_ENABLE_WERROR)
add_compile_flags_if_supported(-Werror)
add_compile_flags_if_supported(-WX)
else()
add_compile_flags_if_supported(-Wno-error)
add_compile_flags_if_supported(-WX-)
endif()
if (LIBUNWIND_ENABLE_PEDANTIC)
add_compile_flags_if_supported(-pedantic)
endif()
# Get feature flags.
# Exceptions
# Catches C++ exceptions only and tells the compiler to assume that extern C
# functions never throw a C++ exception.
add_cxx_compile_flags_if_supported(-fstrict-aliasing)
add_cxx_compile_flags_if_supported(-EHsc)
# Don't run the linker in this CMake check.
#
# The reason why this was added is that when building libunwind for
# ARM Linux, we need to pass the -funwind-tables flag in order for it to
# work properly with ARM EHABI.
#
# However, when performing CMake checks, adding this flag causes the check
# to produce a false negative, because the compiler generates calls
# to __aeabi_unwind_cpp_pr0, which is defined in libunwind itself,
# which isn't built yet, so the linker complains about undefined symbols.
#
# This leads to libunwind not being built with this flag, which makes
# libunwind quite useless in this setup.
set(_previous_CMAKE_TRY_COMPILE_TARGET_TYPE ${CMAKE_TRY_COMPILE_TARGET_TYPE})
set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
add_compile_flags_if_supported(-funwind-tables)
set(CMAKE_TRY_COMPILE_TARGET_TYPE ${_previous_CMAKE_TRY_COMPILE_TARGET_TYPE})
if (LIBUNWIND_USES_ARM_EHABI AND NOT LIBUNWIND_SUPPORTS_FUNWIND_TABLES_FLAG)
message(SEND_ERROR "The -funwind-tables flag must be supported "
"because this target uses ARM Exception Handling ABI")
endif()
add_cxx_compile_flags_if_supported(-fno-exceptions)
add_cxx_compile_flags_if_supported(-fno-rtti)
# Ensure that we don't depend on C++ standard library.
if (LIBUNWIND_HAS_NOSTDINCXX_FLAG)
list(APPEND LIBUNWIND_COMPILE_FLAGS -nostdinc++)
# Remove -stdlib flags to prevent them from causing an unused flag warning.
string(REPLACE "--stdlib=libc++" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
string(REPLACE "--stdlib=libstdc++" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
string(REPLACE "-stdlib=libc++" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
string(REPLACE "-stdlib=libstdc++" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
endif()
# Assert
string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE)
if (LIBUNWIND_ENABLE_ASSERTIONS)
# MSVC doesn't like _DEBUG on release builds. See PR 4379.
if (NOT MSVC)
add_compile_flags(-D_DEBUG)
endif()
# On Release builds cmake automatically defines NDEBUG, so we
# explicitly undefine it:
if (uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE")
add_compile_flags(-UNDEBUG)
endif()
else()
if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE")
add_compile_flags(-DNDEBUG)
endif()
endif()
# Cross-unwinding
if (NOT LIBUNWIND_ENABLE_CROSS_UNWINDING)
add_compile_flags(-D_LIBUNWIND_IS_NATIVE_ONLY)
endif()
# Threading-support
if (NOT LIBUNWIND_ENABLE_THREADS)
add_compile_flags(-D_LIBUNWIND_HAS_NO_THREADS)
endif()
# ARM WMMX register support
if (LIBUNWIND_ENABLE_ARM_WMMX)
# __ARM_WMMX is a compiler pre-define (as per the ACLE 2.0). Clang does not
# define this macro for any supported target at present. Therefore, here we
# provide the option to explicitly enable support for WMMX registers in the
# unwinder.
add_compile_flags(-D__ARM_WMMX)
endif()
if(LIBUNWIND_IS_BAREMETAL)
add_compile_definitions(_LIBUNWIND_IS_BAREMETAL)
endif()
if(LIBUNWIND_USE_FRAME_HEADER_CACHE)
add_compile_definitions(_LIBUNWIND_USE_FRAME_HEADER_CACHE)
endif()
if(LIBUNWIND_REMEMBER_HEAP_ALLOC)
add_compile_definitions(_LIBUNWIND_REMEMBER_HEAP_ALLOC)
endif()
# This is the _ONLY_ place where add_definitions is called.
if (MSVC)
add_definitions(-D_CRT_SECURE_NO_WARNINGS)
endif()
# Disable DLL annotations on Windows for static builds.
if (WIN32 AND LIBUNWIND_ENABLE_STATIC AND NOT LIBUNWIND_ENABLE_SHARED)
add_definitions(-D_LIBUNWIND_HIDE_SYMBOLS)
endif()
if (LIBUNWIND_HAS_COMMENT_LIB_PRAGMA)
if (LIBUNWIND_HAS_DL_LIB)
add_definitions(-D_LIBUNWIND_LINK_DL_LIB)
endif()
if (LIBUNWIND_HAS_PTHREAD_LIB)
add_definitions(-D_LIBUNWIND_LINK_PTHREAD_LIB)
endif()
endif()
#===============================================================================
# Setup Source Code
#===============================================================================
add_subdirectory(include)
add_subdirectory(src)
if (LIBUNWIND_INCLUDE_DOCS)
add_subdirectory(docs)
endif()
if (LIBUNWIND_INCLUDE_TESTS AND EXISTS ${LLVM_CMAKE_DIR})
add_subdirectory(test)
endif()
|