# This tool creates a shared library from the LLVM libraries. Generating this
# library is enabled by setting LLVM_BUILD_LLVM_DYLIB=yes on the CMake
# commandline. By default the shared library only exports the LLVM C API.
set(SOURCES
libllvm.cpp
)
if(LLVM_LINK_LLVM_DYLIB AND LLVM_DYLIB_EXPORTED_SYMBOL_FILE)
message(WARNING "Using LLVM_LINK_LLVM_DYLIB with LLVM_DYLIB_EXPORTED_SYMBOL_FILE may not work. Use at your own risk.")
endif()
if(LLVM_BUILD_LLVM_DYLIB)
if(MSVC)
message(FATAL_ERROR "Generating libLLVM is not supported on MSVC")
endif()
if(ZOS)
message(FATAL_ERROR "Generating libLLVM is not supported on z/OS")
endif()
llvm_map_components_to_libnames(LIB_NAMES ${LLVM_DYLIB_COMPONENTS})
# Exclude libLLVMTableGen for the following reasons:
# - it is only used by internal *-tblgen utilities;
# - it pollutes the global options space.
list(REMOVE_ITEM LIB_NAMES "LLVMTableGen")
if(LLVM_DYLIB_EXPORTED_SYMBOL_FILE)
set(LLVM_EXPORTED_SYMBOL_FILE ${LLVM_DYLIB_EXPORTED_SYMBOL_FILE})
add_custom_target(libLLVMExports DEPENDS ${LLVM_EXPORTED_SYMBOL_FILE})
endif()
if (LLVM_LINK_LLVM_DYLIB)
set(INSTALL_WITH_TOOLCHAIN INSTALL_WITH_TOOLCHAIN)
endif()
if (WIN32)
add_llvm_library(LLVM SHARED DISABLE_LLVM_LINK_LLVM_DYLIB SONAME ${INSTALL_WITH_TOOLCHAIN} ${SOURCES})
else()
add_llvm_library(LLVM SHARED DISABLE_LLVM_LINK_LLVM_DYLIB OUTPUT_NAME LLVM ${INSTALL_WITH_TOOLCHAIN} ${SOURCES})
# Add symlink for backwards compatibility with old library name
llvm_install_library_symlink(LLVM-${LLVM_VERSION_MAJOR}${LLVM_VERSION_SUFFIX} $<TARGET_FILE_NAME:LLVM> SHARED FULL_DEST COMPONENT LLVM)
endif()
list(REMOVE_DUPLICATES LIB_NAMES)
if("${CMAKE_SYSTEM_NAME}" STREQUAL "Darwin")
set(LIB_NAMES -Wl,-all_load ${LIB_NAMES})
else()
configure_file(
${CMAKE_CURRENT_SOURCE_DIR}/simple_version_script.map.in
${LLVM_LIBRARY_DIR}/tools/llvm-shlib/simple_version_script.map)
# GNU ld doesn't resolve symbols in the version script.
set(LIB_NAMES -Wl,--whole-archive ${LIB_NAMES} -Wl,--no-whole-archive)
if (NOT LLVM_LINKER_IS_SOLARISLD AND NOT MINGW)
# Solaris ld does not accept global: *; so there is no way to version *all* global symbols
set(LIB_NAMES -Wl,--version-script,${LLVM_LIBRARY_DIR}/tools/llvm-shlib/simple_version_script.map ${LIB_NAMES})
endif()
if (NOT MINGW AND NOT LLVM_LINKER_IS_SOLARISLD_ILLUMOS)
# Optimize function calls for default visibility definitions to avoid PLT and
# reduce dynamic relocations.
# Note: for -fno-pic default, the address of a function may be different from
# inside and outside libLLVM.so.
target_link_options(LLVM PRIVATE LINKER:-Bsymbolic-functions)
endif()
endif()
target_link_libraries(LLVM PRIVATE ${LIB_NAMES})
if(LLVM_ENABLE_THREADS AND NOT HAVE_CXX_ATOMICS64_WITHOUT_LIB)
target_link_libraries(LLVM PUBLIC atomic)
endif()
if (APPLE)
set_property(TARGET LLVM APPEND_STRING PROPERTY
LINK_FLAGS
" -compatibility_version 1 -current_version ${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}.${LLVM_VERSION_PATCH}")
endif()
if(TARGET libLLVMExports)
add_dependencies(LLVM libLLVMExports)
endif()
endif()
if(LLVM_BUILD_LLVM_C_DYLIB AND NOT MSVC)
if(NOT APPLE)
message(FATAL_ERROR "Generating libLLVM-c is only supported on Darwin")
endif()
if(NOT LLVM_BUILD_LLVM_DYLIB)
message(FATAL_ERROR "Generating libLLVM-c requires LLVM_BUILD_LLVM_C_DYLIB on Darwin")
endif()
# To get the export list for a single llvm library:
# nm ${LIB_PATH} | awk "/T _LLVM/ { print $3 }" | sort -u | sed -e "s/^_//g" > ${LIB_PATH}.exports
set(LLVM_EXPORTED_SYMBOL_FILE ${LLVM_BINARY_DIR}/libllvm-c.exports)
set(LIB_DIR ${LLVM_LIBRARY_DIR})
set(LIB_NAME ${LIB_DIR}/${CMAKE_SHARED_LIBRARY_PREFIX}LLVM)
set(LIB_PATH ${LIB_NAME}${CMAKE_SHARED_LIBRARY_SUFFIX})
set(LIB_EXPORTS_PATH ${LIB_NAME}.exports)
list(APPEND LLVM_DYLIB_REQUIRED_EXPORTS ${LIB_EXPORTS_PATH})
add_custom_command(OUTPUT ${LLVM_EXPORTED_SYMBOL_FILE}
COMMAND nm ${LIB_PATH} | awk "/T _LLVM/ || /T LLVM/ { print $3 }" | sort -u | sed -e "s/^_//g" > ${LLVM_EXPORTED_SYMBOL_FILE}
WORKING_DIRECTORY ${LIB_DIR}
DEPENDS LLVM
COMMENT "Generating Export list for LLVM..."
VERBATIM )
add_custom_target(libLLVMCExports DEPENDS ${LLVM_EXPORTED_SYMBOL_FILE})
add_llvm_library(LLVM-C SHARED ${SOURCES} INSTALL_WITH_TOOLCHAIN)
target_link_libraries(LLVM-C PUBLIC LLVM)
add_dependencies(LLVM-C libLLVMCExports)
set_property(TARGET LLVM-C APPEND_STRING PROPERTY
LINK_FLAGS
" -compatibility_version 1 -current_version ${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}.${LLVM_VERSION_PATCH} -Wl,-reexport_library ${LIB_PATH}")
endif()
if(LLVM_BUILD_LLVM_C_DYLIB AND MSVC)
# Build the LLVM-C.dll library that exports the C API.
set(LLVM_LINK_COMPONENTS
${LLVM_DYLIB_COMPONENTS}
)
llvm_map_components_to_libnames(LIB_NAMES ${LLVM_DYLIB_COMPONENTS})
list(REMOVE_DUPLICATES LIB_NAMES)
# The python script needs to know whether symbols are prefixed with underscores or not.
if(LLVM_HOST_TRIPLE MATCHES "i?86-.*win.*")
set(GEN_UNDERSCORE "--underscore")
else()
set(GEN_UNDERSCORE "")
endif()
# Set this name here, not used in multi conf loop,
# but add script will pick the right one.
set(LIBSFILE ${LLVM_BINARY_DIR}/${CMAKE_CFG_INTDIR}/libllvm-c.args)
# Get the full name to the libs so the python script understands them.
foreach(lib ${LIB_NAMES})
list(APPEND FULL_LIB_NAMES ${LLVM_LIBRARY_DIR}/${lib}.lib)
endforeach()
# Need to separate lib names with newlines.
string(REPLACE ";" "\n" FILE_CONTENT "${FULL_LIB_NAMES}")
if(NOT "${CMAKE_CFG_INTDIR}" STREQUAL ".")
foreach(BUILD_MODE ${CMAKE_CONFIGURATION_TYPES})
# Replace the special string with a per config directory.
string(REPLACE ${CMAKE_CFG_INTDIR} ${BUILD_MODE} PER_CONF_CONTENT "${FILE_CONTENT}")
# Write out the full lib names into file to be read by the python script.
# One libsfile per build, the add_custom_command should expand
# ${CMAKE_CFG_INTDIR} correctly and select the right one.
file(WRITE ${LLVM_BINARY_DIR}/${BUILD_MODE}/libllvm-c.args "${PER_CONF_CONTENT}")
endforeach()
else()
# Write out the full lib names into file to be read by the python script.
file(WRITE ${LIBSFILE} "${FILE_CONTENT}")
endif()
# Generate the exports file dynamically.
set(GEN_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/gen-msvc-exports.py)
set(LLVM_EXPORTED_SYMBOL_FILE ${LLVM_BINARY_DIR}/${CMAKE_CFG_INTDIR}/libllvm-c.exports)
get_host_tool_path(llvm-nm LLVM_NM llvm_nm_exe llvm_nm_target)
add_custom_command(OUTPUT ${LLVM_EXPORTED_SYMBOL_FILE}
COMMAND "${Python3_EXECUTABLE}" ${GEN_SCRIPT} --libsfile ${LIBSFILE} ${GEN_UNDERSCORE} --nm "${llvm_nm_exe}" -o ${LLVM_EXPORTED_SYMBOL_FILE}
DEPENDS ${LIB_NAMES} ${llvm_nm_target}
COMMENT "Generating export list for LLVM-C"
VERBATIM )
# Finally link the target.
add_llvm_library(LLVM-C SHARED INSTALL_WITH_TOOLCHAIN ${SOURCES} DEPENDS intrinsics_gen)
if (LLVM_INTEGRATED_CRT_ALLOC AND MSVC)
# Make sure we search LLVMSupport first, before the CRT libs
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -INCLUDE:malloc")
endif()
endif()
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