Allow building both shared and static library
This change allows building both shared and static version of libc++ in a single build, sharing object files between both versions. Differential Revision: https://reviews.llvm.org/D23232 llvm-svn: 278068
This commit is contained in:
Petr Hosek
parent
f3f5f1209e
commit
9e49a3376e
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@ -52,6 +52,7 @@ MACRO_ENSURE_OUT_OF_SOURCE_BUILD(
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# Basic options ---------------------------------------------------------------
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option(LIBCXX_ENABLE_ASSERTIONS "Enable assertions independent of build mode." ON)
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option(LIBCXX_ENABLE_SHARED "Build libc++ as a shared library." ON)
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option(LIBCXX_ENABLE_STATIC "Build libc++ as a static library." ON)
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option(LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY "Build libc++experimental.a" ON)
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option(LIBCXX_ENABLE_FILESYSTEM
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"Build filesystem as part of libc++experimental.a" ${LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY})
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@ -68,6 +69,10 @@ option(LIBCXX_INSTALL_EXPERIMENTAL_LIBRARY "Install libc++experimental.a" OFF)
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set(LIBCXX_ABI_VERSION 1 CACHE STRING "ABI version of libc++.")
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option(LIBCXX_ABI_UNSTABLE "Unstable ABI of libc++." OFF)
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if (NOT LIBCXX_ENABLE_SHARED AND NOT LIBCXX_ENABLE_STATIC)
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message(FATAL_ERROR "libc++ must be built as either a shared or static library.")
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endif()
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# ABI Library options ---------------------------------------------------------
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set(LIBCXX_CXX_ABI "${LIBCXX_CXX_ABI}" CACHE STRING
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"Specify C++ ABI library to use." FORCE)
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@ -150,8 +150,15 @@ libc++ specific options
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**Default**: ``ON``
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Build libc++ as a shared library. If ``OFF`` is specified then libc++ is
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built as a static library.
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Build libc++ as a shared library. Either :option:`LIBCXX_ENABLE_SHARED` or
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:option:`LIBCXX_ENABLE_STATIC` has to be enabled.
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.. option:: LIBCXX_ENABLE_STATIC:BOOL
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**Default**: ``ON``
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Build libc++ as a static library. Either :option:`LIBCXX_ENABLE_SHARED` or
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:option:`LIBCXX_ENABLE_STATIC` has to be enabled.
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.. option:: LIBCXX_LIBDIR_SUFFIX:STRING
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@ -28,16 +28,6 @@ if(NOT LIBCXX_INSTALL_LIBRARY)
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set(exclude_from_all EXCLUDE_FROM_ALL)
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endif()
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if (LIBCXX_ENABLE_SHARED)
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add_library(cxx SHARED ${exclude_from_all} ${LIBCXX_SOURCES} ${LIBCXX_HEADERS})
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else()
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add_library(cxx STATIC ${exclude_from_all} ${LIBCXX_SOURCES} ${LIBCXX_HEADERS})
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endif()
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if (DEFINED LIBCXX_CXX_ABI_DEPS)
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add_dependencies(cxx LIBCXX_CXX_ABI_DEPS)
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endif()
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#if LIBCXX_CXX_ABI_LIBRARY_PATH is defined we want to add it to the search path.
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add_link_flags_if(LIBCXX_CXX_ABI_LIBRARY_PATH "-L${LIBCXX_CXX_ABI_LIBRARY_PATH}")
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@ -139,18 +129,51 @@ if ( APPLE AND (LIBCXX_CXX_ABI_LIBNAME STREQUAL "libcxxabi" OR
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endif()
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endif()
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target_link_libraries(cxx ${LIBCXX_LIBRARIES})
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split_list(LIBCXX_COMPILE_FLAGS)
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split_list(LIBCXX_LINK_FLAGS)
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set_target_properties(cxx
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# Add a object library that contains the compiled source files.
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add_library(cxx_objects OBJECT ${exclude_from_all} ${LIBCXX_SOURCES} ${LIBCXX_HEADERS})
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set_target_properties(cxx_objects
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PROPERTIES
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COMPILE_FLAGS "${LIBCXX_COMPILE_FLAGS}"
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)
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set(LIBCXX_TARGETS)
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# Build the shared library.
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if (LIBCXX_ENABLE_SHARED)
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add_library(cxx_shared SHARED $<TARGET_OBJECTS:cxx_objects>)
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target_link_libraries(cxx_shared ${LIBCXX_LIBRARIES})
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set_target_properties(cxx_shared
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PROPERTIES
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LINK_FLAGS "${LIBCXX_LINK_FLAGS}"
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OUTPUT_NAME "c++"
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VERSION "${LIBCXX_ABI_VERSION}.0"
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SOVERSION "${LIBCXX_ABI_VERSION}"
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)
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list(APPEND LIBCXX_TARGETS "cxx_shared")
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endif()
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# Build the static library.
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if (LIBCXX_ENABLE_STATIC)
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add_library(cxx_static STATIC $<TARGET_OBJECTS:cxx_objects>)
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target_link_libraries(cxx_static ${LIBCXX_LIBRARIES})
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set_target_properties(cxx_static
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PROPERTIES
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LINK_FLAGS "${LIBCXX_LINK_FLAGS}"
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OUTPUT_NAME "c++"
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)
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list(APPEND LIBCXX_TARGETS "cxx_static")
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endif()
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# Add a meta-target for both libraries.
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add_custom_target(cxx DEPENDS ${LIBCXX_TARGETS})
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if (DEFINED LIBCXX_CXX_ABI_DEPS)
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add_dependencies(cxx LIBCXX_CXX_ABI_DEPS)
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endif()
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if (LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY)
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file(GLOB LIBCXX_EXPERIMENTAL_SOURCES ../src/experimental/*.cpp)
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@ -158,7 +181,11 @@ if (LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY)
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file(GLOB LIBCXX_FILESYSTEM_SOURCES ../src/experimental/filesystem/*.cpp)
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endif()
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add_library(cxx_experimental STATIC ${LIBCXX_EXPERIMENTAL_SOURCES} ${LIBCXX_FILESYSTEM_SOURCES})
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target_link_libraries(cxx_experimental cxx)
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if (LIBCXX_ENABLE_SHARED)
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target_link_libraries(cxx_experimental cxx_shared)
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else()
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target_link_libraries(cxx_experimental cxx_static)
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endif()
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set(experimental_flags "${LIBCXX_COMPILE_FLAGS}")
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check_flag_supported(-std=c++14)
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@ -174,7 +201,7 @@ endif()
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# Generate a linker script inplace of a libc++.so symlink. Rerun this command
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# after cxx builds.
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if (LIBCXX_ENABLE_ABI_LINKER_SCRIPT)
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if (LIBCXX_ENABLE_SHARED AND LIBCXX_ENABLE_ABI_LINKER_SCRIPT)
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# Get the name of the ABI library and handle the case where CXXABI_LIBNAME
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# is a target name and not a library. Ex cxxabi_shared.
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set(SCRIPT_ABI_LIBNAME "${LIBCXX_CXX_ABI_LIBRARY}")
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@ -183,11 +210,11 @@ if (LIBCXX_ENABLE_ABI_LINKER_SCRIPT)
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endif()
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# Generate a linker script inplace of a libc++.so symlink. Rerun this command
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# after cxx builds.
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add_custom_command(TARGET cxx POST_BUILD
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add_custom_command(TARGET cxx_shared POST_BUILD
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COMMAND
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${PYTHON_EXECUTABLE} ${LIBCXX_SOURCE_DIR}/utils/gen_link_script/gen_link_script.py
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ARGS
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"$<TARGET_LINKER_FILE:cxx>"
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"$<TARGET_LINKER_FILE:cxx_shared>"
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"${SCRIPT_ABI_LIBNAME}"
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WORKING_DIRECTORY ${LIBCXX_BUILD_DIR}
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)
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@ -197,13 +224,13 @@ if (LIBCXX_INSTALL_LIBRARY)
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if (LIBCXX_INSTALL_EXPERIMENTAL_LIBRARY)
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set(experimental_lib cxx_experimental)
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endif()
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install(TARGETS cxx ${experimental_lib}
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install(TARGETS ${LIBCXX_TARGETS} ${experimental_lib}
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LIBRARY DESTINATION lib${LIBCXX_LIBDIR_SUFFIX} COMPONENT libcxx
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ARCHIVE DESTINATION lib${LIBCXX_LIBDIR_SUFFIX} COMPONENT libcxx
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)
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# NOTE: This install command must go after the cxx install command otherwise
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# it will not be executed after the library symlinks are installed.
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if (LIBCXX_ENABLE_ABI_LINKER_SCRIPT)
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if (LIBCXX_ENABLE_SHARED AND LIBCXX_ENABLE_ABI_LINKER_SCRIPT)
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# Replace the libc++ filename with $<TARGET_LINKER_FILE:cxx>
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# after we required CMake 3.0.
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install(FILES "${LIBCXX_LIBRARY_DIR}/libc++${CMAKE_SHARED_LIBRARY_SUFFIX}"
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