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[llvm-libgcc][CMake] Refactor llvm-libgcc (#65455)
There are some issues in `llvm-libgcc` before this patch:
Commit c5a20b5182 ([llvm-libgcc] initial
commit)
uses `$<TARGET_OBJECTS:unwind_static>` to get libunwind objects, which
is empty.
The built library is actually a shared version of libclang_rt.builtins.
When configuring with `llvm/CMakeLists.txt`, target `llvm-libgcc`
requires a
corresponding target in `llvm-libgcc/CMakeLists.txt`.
Per target installation is not handled by `llvm-libgcc`, which is not
consistent
with `libunwind`.
This patch fixes those issues by:
Reusing target `unwind_shared` in `libunwind`, linking
`compiler-rt.builtins`
objects into it, and applying version script.
Adding target `llvm-libgcc`, creating symlinks, and utilizing cmake's
dependency
and component mechanism to ensure link targets will be built and
installed along
with symlinks.
Mimicking `libunwind` to handle per target installation.
It is quite hard to set necessary options without further modifying the
order of
runtime projects in `runtimes/CMakeLists.txt`. So though this patch
reveals the
possibility of co-existence of `llvm-libgcc` and
`compiler-rt`/`libunwind` in
`LLVM_ENABLE_RUNTIMES`, we still inhibit it to minimize influence on
other
projects, considering that `llvm-libgcc` is only intended for toolchain
vendors,
and not for casual use.
This commit is contained in:
ur4t
GitHub
parent
44532a9dd4
commit
7ac1f60f01
@ -1,19 +1,38 @@
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cmake_minimum_required(VERSION 3.20.0)
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#===============================================================================
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# Setup Project
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#===============================================================================
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if (NOT IS_DIRECTORY "${CMAKE_CURRENT_LIST_DIR}/../libunwind")
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message(FATAL_ERROR "llvm-libgcc requires being built in a monorepo layout with libunwind available")
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endif()
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cmake_minimum_required(VERSION 3.20.0)
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set(LLVM_COMMON_CMAKE_UTILS "${CMAKE_CURRENT_SOURCE_DIR}/../cmake")
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list(APPEND CMAKE_MODULE_PATH
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# Check if llvm-libgcc is built as a standalone project
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if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR LLVM_LIBGCC_STANDALONE_BUILD)
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project(llvm-libgcc LANGUAGES C CXX ASM)
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set(COMPILER_RT_STANDALONE_BUILD ON)
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set_property(GLOBAL PROPERTY USE_FOLDERS ON)
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set(LLVM_LIBGCC_COMPILER_RT_BINARY_DIR "compiler-rt")
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set(LLVM_LIBGCC_LIBUNWIND_BINARY_DIR "libunwind")
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else()
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set(LLVM_LIBGCC_COMPILER_RT_BINARY_DIR "../compiler-rt")
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set(LLVM_LIBGCC_LIBUNWIND_BINARY_DIR "../libunwind")
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endif()
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# Add path for custom modules
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list(INSERT CMAKE_MODULE_PATH 0
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"${CMAKE_CURRENT_SOURCE_DIR}/cmake"
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"${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules"
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"${CMAKE_CURRENT_SOURCE_DIR}/../runtimes/cmake/Modules"
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"${LLVM_COMMON_CMAKE_UTILS}"
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"${LLVM_COMMON_CMAKE_UTILS}/Modules"
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)
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project(llvm-libgcc LANGUAGES C CXX ASM)
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set(LLVM_LIBGCC_LIBUNWIND_PATH "${CMAKE_CURRENT_LIST_DIR}/../libunwind"
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CACHE PATH "Specify path to libunwind source.")
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set(LLVM_LIBGCC_COMPILER_RT_PATH "${CMAKE_CURRENT_LIST_DIR}/../compiler-rt"
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CACHE PATH "Specify path to compiler-rt source.")
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include(GNUInstallDirs)
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if(NOT LLVM_LIBGCC_EXPLICIT_OPT_IN)
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message(FATAL_ERROR
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@ -25,18 +44,114 @@ if(NOT LLVM_LIBGCC_EXPLICIT_OPT_IN)
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"to your CMake invocation and try again.")
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endif()
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set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/lib${LLVMLIB_DIR_SUFFIX}")
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set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/lib${LLVMLIB_DIR_SUFFIX}")
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set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/bin")
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if(HAVE_COMPILER_RT)
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message(FATAL_ERROR
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"Attempting to build both compiler-rt and llvm-libgcc will cause irreconcilable "
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"target clashes. Please choose one or the other, but not both.")
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endif()
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set(COMPILER_RT_BUILD_BUILTINS On)
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set(COMPILER_RT_BUILTINS_HIDE_SYMBOLS Off)
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add_subdirectory("../compiler-rt" "compiler-rt")
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if(HAVE_LIBUNWIND)
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message(FATAL_ERROR
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"Attempting to build both libunwind and llvm-libgcc will cause irreconcilable "
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"target clashes. Please choose one or the other, but not both.")
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endif()
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set(LIBUNWIND_ENABLE_STATIC On)
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set(LIBUNWIND_ENABLE_SHARED Off)
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set(LIBUNWIND_HAS_COMMENT_LIB_PRAGMA Off)
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set(LIBUNWIND_USE_COMPILER_RT On)
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add_subdirectory("../libunwind" "libunwind")
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#===============================================================================
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# Configure System
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#===============================================================================
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add_subdirectory(lib)
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if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
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set(LLVM_LIBGCC_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${LLVM_DEFAULT_TARGET_TRIPLE})
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set(LLVM_LIBGCC_INSTALL_LIBRARY_DIR lib${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE} CACHE PATH
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"Path where built llvm-libgcc libraries should be installed.")
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if(LIBCXX_LIBDIR_SUBDIR)
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string(APPEND LLVM_LIBGCC_LIBRARY_DIR /${LLVM_LIBGCC_LIBDIR_SUBDIR})
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string(APPEND LLVM_LIBGCC_INSTALL_LIBRARY_DIR /${LLVM_LIBGCC_LIBDIR_SUBDIR})
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endif()
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else()
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if(LLVM_LIBRARY_OUTPUT_INTDIR)
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set(LLVM_LIBGCC_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
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else()
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set(LLVM_LIBGCC_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LLVM_LIBGCC_LIBDIR_SUFFIX})
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endif()
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set(LLVM_LIBGCC_INSTALL_LIBRARY_DIR lib${LLVM_LIBGCC_LIBDIR_SUFFIX} CACHE PATH
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"Path where built llvm-libgcc libraries should be installed.")
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endif()
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set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${LLVM_LIBGCC_LIBRARY_DIR})
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set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${LLVM_LIBGCC_LIBRARY_DIR})
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set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${LLVM_LIBGCC_LIBRARY_DIR})
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#===============================================================================
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# Build libraries
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#===============================================================================
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set(COMPILER_RT_BUILD_BUILTINS ON)
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set(COMPILER_RT_BUILTINS_HIDE_SYMBOLS OFF)
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add_subdirectory(${LLVM_LIBGCC_COMPILER_RT_PATH} ${LLVM_LIBGCC_COMPILER_RT_BINARY_DIR})
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set(LIBUNWIND_ENABLE_STATIC ON)
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set(LIBUNWIND_ENABLE_SHARED ON)
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set(LIBUNWIND_USE_COMPILER_RT OFF)
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set(LIBUNWIND_HAS_GCC_LIB OFF)
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set(LIBUNWIND_HAS_GCC_S_LIB OFF)
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add_subdirectory(${LLVM_LIBGCC_LIBUNWIND_PATH} ${LLVM_LIBGCC_LIBUNWIND_BINARY_DIR})
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add_custom_target(gcc_s.ver
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SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/gcc_s.ver.in
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COMMAND ${CMAKE_C_COMPILER} -E
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-xc ${CMAKE_CURRENT_SOURCE_DIR}/gcc_s.ver.in
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-o ${CMAKE_CURRENT_BINARY_DIR}/gcc_s.ver
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)
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add_dependencies(unwind_shared gcc_s.ver)
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construct_compiler_rt_default_triple()
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target_link_options(unwind_shared PUBLIC
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-Wl,--version-script,${CMAKE_CURRENT_BINARY_DIR}/gcc_s.ver
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)
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target_link_libraries(unwind_shared PUBLIC
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$<TARGET_OBJECTS:clang_rt.builtins-${COMPILER_RT_DEFAULT_TARGET_ARCH}>
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m
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)
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#===============================================================================
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# Install Symlinks
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#===============================================================================
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get_compiler_rt_install_dir(${COMPILER_RT_DEFAULT_TARGET_ARCH} install_dir_builtins)
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string(REGEX REPLACE "^lib/" "" install_dir_builtins "${install_dir_builtins}")
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string(FIND "${install_dir_builtins}" "clang" install_path_contains_triple)
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if(install_path_contains_triple EQUAL -1)
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set(builtins_suffix "-${COMPILER_RT_DEFAULT_TARGET_ARCH}")
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else()
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string(PREPEND install_dir_builtins "../")
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endif()
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set(LLVM_LIBGCC_COMPILER_RT ${install_dir_builtins}/libclang_rt.builtins${builtins_suffix}.a)
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add_custom_target(llvm-libgcc ALL
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DEPENDS unwind_shared unwind_static clang_rt.builtins-${COMPILER_RT_DEFAULT_TARGET_ARCH}
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COMMAND ${CMAKE_COMMAND} -E create_symlink ${LLVM_LIBGCC_COMPILER_RT} libgcc.a
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COMMAND ${CMAKE_COMMAND} -E create_symlink libunwind.a libgcc_eh.a
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COMMAND ${CMAKE_COMMAND} -E create_symlink libunwind.so libgcc_s.so.1.0
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COMMAND ${CMAKE_COMMAND} -E create_symlink libgcc_s.so.1.0 libgcc_s.so.1
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COMMAND ${CMAKE_COMMAND} -E create_symlink libgcc_s.so.1 libgcc_s.so
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)
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install(TARGETS unwind_shared unwind_static
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LIBRARY DESTINATION ${LLVM_LIBGCC_INSTALL_LIBRARY_DIR} COMPONENT llvm-libgcc
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ARCHIVE DESTINATION ${LLVM_LIBGCC_INSTALL_LIBRARY_DIR} COMPONENT llvm-libgcc
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RUNTIME DESTINATION ${LLVM_LIBGCC_INSTALL_RUNTIME_DIR} COMPONENT llvm-libgcc)
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install(TARGETS clang_rt.builtins-${COMPILER_RT_DEFAULT_TARGET_ARCH}
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LIBRARY DESTINATION ${LLVM_LIBGCC_INSTALL_LIBRARY_DIR}/${install_dir_builtins} COMPONENT llvm-libgcc
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ARCHIVE DESTINATION ${LLVM_LIBGCC_INSTALL_LIBRARY_DIR}/${install_dir_builtins} COMPONENT llvm-libgcc
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RUNTIME DESTINATION ${LLVM_LIBGCC_INSTALL_RUNTIME_DIR}/${install_dir_builtins} COMPONENT llvm-libgcc)
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foreach(VAR libgcc.a libgcc_eh.a libgcc_s.so.1.0 libgcc_s.so.1 libgcc_s.so)
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install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${VAR}
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DESTINATION ${LLVM_LIBGCC_INSTALL_LIBRARY_DIR}
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COMPONENT llvm-libgcc)
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endforeach()
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@ -1,86 +0,0 @@
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include(CheckLibraryExists)
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include(GNUInstallDirs)
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include(ExtendPath)
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string(REPLACE "-Wl,-z,defs" "" CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS}")
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add_custom_target(gcc_s_ver ALL DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/gcc_s.ver")
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set(LLVM_LIBGCC_GCC_S_VER "${CMAKE_CURRENT_BINARY_DIR}/gcc_s.ver")
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add_custom_target(gcc_s.ver ALL
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DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/gcc_s.ver"
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COMMAND
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"${CMAKE_C_COMPILER}"
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"-E"
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"-xc" "${CMAKE_CURRENT_SOURCE_DIR}/gcc_s.ver"
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"-o" "${CMAKE_CURRENT_BINARY_DIR}/gcc_s.ver"
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)
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set_target_properties(gcc_s.ver PROPERTIES
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OUTPUT_PATH "${CMAKE_CURRENT_BINARY_DIR}/gcc_s.ver")
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add_library(libgcc_s SHARED blank.c)
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add_dependencies(libgcc_s gcc_s_ver)
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set_target_properties(libgcc_s
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PROPERTIES
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LINKER_LANGUAGE C
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OUTPUT_NAME "unwind"
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VERSION "1.0"
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SOVERSION "1"
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POSITION_INDEPENDENT_CODE ON)
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string(REGEX MATCH "[^-]+" LLVM_LIBGCC_TARGET_ARCH ${CMAKE_C_COMPILER_TARGET})
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target_link_libraries(libgcc_s PRIVATE
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$<TARGET_OBJECTS:unwind_static>
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$<TARGET_OBJECTS:clang_rt.builtins-${LLVM_LIBGCC_TARGET_ARCH}>
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)
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target_link_options(libgcc_s PRIVATE
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-nostdlib
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-Wl,--version-script,$<TARGET_PROPERTY:gcc_s.ver,OUTPUT_PATH>)
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check_library_exists(m sin "" LLVM_LIBGCC_HAS_LIBM)
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target_link_libraries(libgcc_s PRIVATE
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$<$<BOOL:LLVM_LIBGCC_HAS_LIBM>:m>
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c
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)
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extend_path(LLVM_LIBGCC_LIBUNWIND_STATIC_ROOT "${CMAKE_INSTALL_PREFIX}" "${LIBUNWIND_INSTALL_LIBRARY_DIR}")
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#string(REPLACE "${CMAKE_INSTALL_FULL_LIBDIR}/" "" LLVM_LIBGCC_LIBUNWIND_STATIC_ROOT "${LLVM_LIBGCC_LIBUNWIND_STATIC_ROOT}")
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install(TARGETS libgcc_s
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LIBRARY DESTINATION "${LLVM_LIBGCC_LIBUNWIND_STATIC_ROOT}" COMPONENT unwind
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ARCHIVE DESTINATION "${LLVM_LIBGCC_LIBUNWIND_STATIC_ROOT}" COMPONENT unwind
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RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}" COMPONENT unwind)
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get_compiler_rt_install_dir(${LLVM_LIBGCC_TARGET_ARCH} install_dir_builtins)
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string(REGEX REPLACE "^lib/" "" install_dir_builtins "${install_dir_builtins}")
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string(FIND "${install_dir_builtins}" "clang" install_path_contains_triple)
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if(install_path_contains_triple EQUAL -1)
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set(builtins_suffix "-${LLVM_LIBGCC_TARGET_ARCH}")
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else()
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string(PREPEND install_dir_builtins "../")
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endif()
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install(CODE "execute_process(
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COMMAND \"\${CMAKE_COMMAND}\" -E
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create_symlink ${install_dir_builtins}/libclang_rt.builtins${builtins_suffix}.a libgcc.a
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WORKING_DIRECTORY \"\$ENV{DESTDIR}${LLVM_LIBGCC_LIBUNWIND_STATIC_ROOT}\")"
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COMPONENT unwind)
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install(CODE "execute_process(
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COMMAND \"\${CMAKE_COMMAND}\" -E
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create_symlink libunwind.a libgcc_eh.a
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WORKING_DIRECTORY \"\$ENV{DESTDIR}${LLVM_LIBGCC_LIBUNWIND_STATIC_ROOT}\")"
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COMPONENT unwind)
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install(CODE "execute_process(
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COMMAND \"\${CMAKE_COMMAND}\" -E
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create_symlink libunwind.so libgcc_s.so.1.0
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WORKING_DIRECTORY \"\$ENV{DESTDIR}${LLVM_LIBGCC_LIBUNWIND_STATIC_ROOT}\")"
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COMPONENT unwind)
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install(CODE "execute_process(
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COMMAND \"\${CMAKE_COMMAND}\" -E
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create_symlink libgcc_s.so.1.0 libgcc_s.so.1
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WORKING_DIRECTORY \"\$ENV{DESTDIR}${LLVM_LIBGCC_LIBUNWIND_STATIC_ROOT}\")"
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COMPONENT unwind)
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install(CODE "execute_process(
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COMMAND \"\${CMAKE_COMMAND}\" -E
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create_symlink libgcc_s.so.1 libgcc_s.so
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WORKING_DIRECTORY \"\$ENV{DESTDIR}${LLVM_LIBGCC_LIBUNWIND_STATIC_ROOT}\")"
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COMPONENT unwind)
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@ -216,23 +216,6 @@ if(LLVM_INCLUDE_TESTS)
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umbrella_lit_testsuite_begin(check-runtimes)
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endif()
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# llvm-libgcc incorporates both compiler-rt and libunwind as subprojects with very
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# specific flags, which causes clashes when they're independently built too.
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if("llvm-libgcc" IN_LIST runtimes)
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if("compiler-rt" IN_LIST runtimes OR "compiler-rt" IN_LIST LLVM_ENABLE_PROJECTS)
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message(FATAL_ERROR
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"Attempting to build both compiler-rt and llvm-libgcc will cause irreconcilable "
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"target clashes. Please choose one or the other, but not both.")
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endif()
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if("libunwind" IN_LIST runtimes)
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message(
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FATAL_ERROR
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"Attempting to build both libunwind and llvm-libgcc will cause irreconcilable "
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"target clashes. Please choose one or the other, but not both.")
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endif()
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endif()
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# We do this in two loops so that HAVE_* is set for each runtime before the
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# other runtimes are added.
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foreach(entry ${runtimes})
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