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CMakeLists.txt
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#===============================================================================
# Setup Project
#===============================================================================
cmake_minimum_required(VERSION 3.20.0)
set(LLVM_SUBPROJECT_TITLE "LLVM libgcc")
set(LLVM_COMMON_CMAKE_UTILS "${CMAKE_CURRENT_SOURCE_DIR}/../cmake")
# Check if llvm-libgcc is built as a standalone project
if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR LLVM_LIBGCC_STANDALONE_BUILD)
project(llvm-libgcc LANGUAGES C CXX ASM)
set(COMPILER_RT_STANDALONE_BUILD ON)
set_property(GLOBAL PROPERTY USE_FOLDERS ON)
set(LLVM_LIBGCC_COMPILER_RT_BINARY_DIR "compiler-rt")
set(LLVM_LIBGCC_LIBUNWIND_BINARY_DIR "libunwind")
else()
set(LLVM_LIBGCC_COMPILER_RT_BINARY_DIR "../compiler-rt")
set(LLVM_LIBGCC_LIBUNWIND_BINARY_DIR "../libunwind")
endif()
# Add path for custom modules
list(INSERT CMAKE_MODULE_PATH 0
"${CMAKE_CURRENT_SOURCE_DIR}/cmake"
"${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules"
"${CMAKE_CURRENT_SOURCE_DIR}/../runtimes/cmake/Modules"
"${LLVM_COMMON_CMAKE_UTILS}"
"${LLVM_COMMON_CMAKE_UTILS}/Modules"
)
set(LLVM_LIBGCC_LIBUNWIND_PATH "${CMAKE_CURRENT_LIST_DIR}/../libunwind"
CACHE PATH "Specify path to libunwind source.")
set(LLVM_LIBGCC_COMPILER_RT_PATH "${CMAKE_CURRENT_LIST_DIR}/../compiler-rt"
CACHE PATH "Specify path to compiler-rt source.")
include(GNUInstallDirs)
if(NOT LLVM_LIBGCC_EXPLICIT_OPT_IN)
message(FATAL_ERROR
"llvm-libgcc is not for the casual LLVM user. It is intended to be used by distro "
"managers who want to replace libgcc with compiler-rt and libunwind, but cannot "
"fully abandon the libgcc family (e.g. because they are dependent on glibc). Such "
"managers must have worked out their compatibility requirements ahead of using "
"llvm-libgcc. If you want to build llvm-libgcc, please add -DLLVM_LIBGCC_EXPLICIT_OPT_IN=Yes "
"to your CMake invocation and try again.")
endif()
if(HAVE_COMPILER_RT)
message(FATAL_ERROR
"Attempting to build both compiler-rt and llvm-libgcc will cause irreconcilable "
"target clashes. Please choose one or the other, but not both.")
endif()
if(HAVE_LIBUNWIND)
message(FATAL_ERROR
"Attempting to build both libunwind and llvm-libgcc will cause irreconcilable "
"target clashes. Please choose one or the other, but not both.")
endif()
#===============================================================================
# Configure System
#===============================================================================
if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
set(TARGET_SUBDIR ${LLVM_DEFAULT_TARGET_TRIPLE})
if(LLVM_LIBGCC_LIBDIR_SUBDIR)
string(APPEND TARGET_SUBDIR /${LLVM_LIBGCC_LIBDIR_SUBDIR})
endif()
set(LLVM_LIBGCC_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${TARGET_SUBDIR})
set(LLVM_LIBGCC_INSTALL_LIBRARY_DIR lib${LLVM_LIBDIR_SUFFIX}/${TARGET_SUBDIR} CACHE PATH
"Path where built llvm-libgcc libraries should be installed.")
unset(TARGET_SUBDIR)
else()
if(LLVM_LIBRARY_OUTPUT_INTDIR)
set(LLVM_LIBGCC_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
else()
set(LLVM_LIBGCC_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LLVM_LIBGCC_LIBDIR_SUFFIX})
endif()
set(LLVM_LIBGCC_INSTALL_LIBRARY_DIR lib${LLVM_LIBGCC_LIBDIR_SUFFIX} CACHE PATH
"Path where built llvm-libgcc libraries should be installed.")
endif()
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${LLVM_LIBGCC_LIBRARY_DIR})
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${LLVM_LIBGCC_LIBRARY_DIR})
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${LLVM_LIBGCC_LIBRARY_DIR})
#===============================================================================
# Build libraries
#===============================================================================
set(COMPILER_RT_BUILD_BUILTINS ON)
set(COMPILER_RT_BUILTINS_HIDE_SYMBOLS OFF)
add_subdirectory(${LLVM_LIBGCC_COMPILER_RT_PATH} ${LLVM_LIBGCC_COMPILER_RT_BINARY_DIR})
set(LIBUNWIND_ENABLE_STATIC ON)
set(LIBUNWIND_ENABLE_SHARED ON)
set(LIBUNWIND_USE_COMPILER_RT OFF)
set(LIBUNWIND_HAS_GCC_LIB OFF)
set(LIBUNWIND_HAS_GCC_S_LIB OFF)
add_subdirectory(${LLVM_LIBGCC_LIBUNWIND_PATH} ${LLVM_LIBGCC_LIBUNWIND_BINARY_DIR})
add_custom_target(gcc_s.ver
SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/gcc_s.ver.in
COMMAND ${CMAKE_C_COMPILER} -E
-xc ${CMAKE_CURRENT_SOURCE_DIR}/gcc_s.ver.in
-o ${CMAKE_CURRENT_BINARY_DIR}/gcc_s.ver
)
add_dependencies(unwind_shared gcc_s.ver)
construct_compiler_rt_default_triple()
target_link_options(unwind_shared PUBLIC
-Wl,--version-script,${CMAKE_CURRENT_BINARY_DIR}/gcc_s.ver
)
target_link_libraries(unwind_shared PUBLIC
$<TARGET_OBJECTS:clang_rt.builtins-${COMPILER_RT_DEFAULT_TARGET_ARCH}>
m
)
#===============================================================================
# Install Symlinks
#===============================================================================
get_compiler_rt_install_dir(${COMPILER_RT_DEFAULT_TARGET_ARCH} install_dir_builtins)
string(REGEX REPLACE "^lib/" "" install_dir_builtins "${install_dir_builtins}")
string(FIND "${install_dir_builtins}" "clang" install_path_contains_triple)
if(install_path_contains_triple EQUAL -1)
set(builtins_suffix "-${COMPILER_RT_DEFAULT_TARGET_ARCH}")
else()
string(PREPEND install_dir_builtins "../")
endif()
set(LLVM_LIBGCC_COMPILER_RT ${install_dir_builtins}/libclang_rt.builtins${builtins_suffix}.a)
add_custom_target(llvm-libgcc ALL
DEPENDS unwind_shared unwind_static clang_rt.builtins-${COMPILER_RT_DEFAULT_TARGET_ARCH}
COMMAND ${CMAKE_COMMAND} -E create_symlink ${LLVM_LIBGCC_COMPILER_RT} libgcc.a
COMMAND ${CMAKE_COMMAND} -E create_symlink libunwind.a libgcc_eh.a
COMMAND ${CMAKE_COMMAND} -E create_symlink libunwind.so libgcc_s.so.1.0
COMMAND ${CMAKE_COMMAND} -E create_symlink libgcc_s.so.1.0 libgcc_s.so.1
COMMAND ${CMAKE_COMMAND} -E create_symlink libgcc_s.so.1 libgcc_s.so
)
install(TARGETS unwind_shared unwind_static
LIBRARY DESTINATION ${LLVM_LIBGCC_INSTALL_LIBRARY_DIR} COMPONENT llvm-libgcc
ARCHIVE DESTINATION ${LLVM_LIBGCC_INSTALL_LIBRARY_DIR} COMPONENT llvm-libgcc
RUNTIME DESTINATION ${LLVM_LIBGCC_INSTALL_RUNTIME_DIR} COMPONENT llvm-libgcc)
install(TARGETS clang_rt.builtins-${COMPILER_RT_DEFAULT_TARGET_ARCH}
LIBRARY DESTINATION ${LLVM_LIBGCC_INSTALL_LIBRARY_DIR}/${install_dir_builtins} COMPONENT llvm-libgcc
ARCHIVE DESTINATION ${LLVM_LIBGCC_INSTALL_LIBRARY_DIR}/${install_dir_builtins} COMPONENT llvm-libgcc
RUNTIME DESTINATION ${LLVM_LIBGCC_INSTALL_RUNTIME_DIR}/${install_dir_builtins} COMPONENT llvm-libgcc)
foreach(VAR libgcc.a libgcc_eh.a libgcc_s.so.1.0 libgcc_s.so.1 libgcc_s.so)
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${VAR}
DESTINATION ${LLVM_LIBGCC_INSTALL_LIBRARY_DIR}
COMPONENT llvm-libgcc)
endforeach()