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1# This tool creates a shared library from the LLVM libraries. Generating this2# library is enabled by setting LLVM_BUILD_LLVM_DYLIB=yes on the CMake3# commandline. By default the shared library only exports the LLVM C API.4 5set(SOURCES6 libllvm.cpp7 )8 9if(LLVM_LINK_LLVM_DYLIB AND LLVM_DYLIB_EXPORTED_SYMBOL_FILE)10 message(WARNING "Using LLVM_LINK_LLVM_DYLIB with LLVM_DYLIB_EXPORTED_SYMBOL_FILE may not work. Use at your own risk.")11endif()12 13if(LLVM_BUILD_LLVM_DYLIB)14 if(MSVC AND NOT LLVM_BUILD_LLVM_DYLIB_VIS)15 message(FATAL_ERROR "Generating libLLVM is not supported on MSVC")16 endif()17 if(ZOS)18 message(FATAL_ERROR "Generating libLLVM is not supported on z/OS")19 endif()20 21 llvm_map_components_to_libnames(LIB_NAMES ${LLVM_DYLIB_COMPONENTS})22 23 # Exclude libLLVMTableGen for the following reasons:24 # - it is only used by internal *-tblgen utilities;25 # - it pollutes the global options space.26 list(REMOVE_ITEM LIB_NAMES "LLVMTableGen")27 28 if(LLVM_DYLIB_EXPORTED_SYMBOL_FILE)29 set(LLVM_EXPORTED_SYMBOL_FILE ${LLVM_DYLIB_EXPORTED_SYMBOL_FILE})30 add_custom_target(libLLVMExports DEPENDS ${LLVM_EXPORTED_SYMBOL_FILE})31 endif()32 33 if (LLVM_LINK_LLVM_DYLIB)34 set(INSTALL_WITH_TOOLCHAIN INSTALL_WITH_TOOLCHAIN)35 endif()36 if (WIN32 OR CYGWIN)37 add_llvm_library(LLVM SHARED DISABLE_LLVM_LINK_LLVM_DYLIB SONAME ${INSTALL_WITH_TOOLCHAIN} ${SOURCES})38 else()39 add_llvm_library(LLVM SHARED DISABLE_LLVM_LINK_LLVM_DYLIB OUTPUT_NAME LLVM ${INSTALL_WITH_TOOLCHAIN} ${SOURCES})40 # Add symlink for backwards compatibility with old library name41 llvm_install_library_symlink(LLVM-${LLVM_VERSION_MAJOR}${LLVM_VERSION_SUFFIX} $<TARGET_FILE_NAME:LLVM> SHARED FULL_DEST COMPONENT LLVM)42 endif()43 44 if (MINGW OR CYGWIN)45 # The LLVM DLL is supposed to export all symbols (except for ones46 # that are explicitly hidden). Normally, this is what happens anyway, but47 # if there are symbols that are marked explicitly as dllexport, we'd only48 # export them and nothing else. Therefore, add --export-all-symbols to49 # make sure we export all symbols despite potential dllexports.50 target_link_options(LLVM PRIVATE LINKER:--export-all-symbols)51 endif()52 53 list(REMOVE_DUPLICATES LIB_NAMES)54 if("${CMAKE_SYSTEM_NAME}" STREQUAL "Darwin")55 set(LIB_NAMES -Wl,-all_load ${LIB_NAMES})56 else()57 if("${CMAKE_CFG_INTDIR}" STREQUAL ".")58 configure_file(59 ${CMAKE_CURRENT_SOURCE_DIR}/simple_version_script.map.in60 ${LLVM_LIBRARY_DIR}/tools/llvm-shlib/simple_version_script.map)61 else()62 foreach(BUILD_MODE ${CMAKE_CONFIGURATION_TYPES})63 # Replace the special string with a per config directory.64 string(REPLACE ${CMAKE_CFG_INTDIR} ${BUILD_MODE} PER_CONF_LIBRARY_DIR ${LLVM_LIBRARY_DIR})65 configure_file(66 ${CMAKE_CURRENT_SOURCE_DIR}/simple_version_script.map.in67 ${PER_CONF_LIBRARY_DIR}/tools/llvm-shlib/simple_version_script.map)68 endforeach()69 endif()70 if(MSVC)71 target_link_directories(LLVM PRIVATE ${LLVM_LIBRARY_DIR})72 foreach(library ${LIB_NAMES})73 target_link_options(LLVM PRIVATE /WHOLEARCHIVE:${library}.lib)74 endforeach()75 else()76 # GNU ld doesn't resolve symbols in the version script.77 set(LIB_NAMES -Wl,--whole-archive ${LIB_NAMES} -Wl,--no-whole-archive)78 if (NOT LLVM_LINKER_IS_SOLARISLD AND NOT MINGW AND NOT CYGWIN)79 # Solaris ld does not accept global: *; so there is no way to version *all* global symbols80 set(LIB_NAMES -Wl,--version-script,${LLVM_LIBRARY_DIR}/tools/llvm-shlib/simple_version_script.map ${LIB_NAMES})81 endif()82 if (LLVM_LINKER_SUPPORTS_B_SYMBOLIC_FUNCTIONS)83 # Optimize function calls for default visibility definitions to avoid PLT and84 # reduce dynamic relocations.85 # Note: for -fno-pic default, the address of a function may be different from86 # inside and outside libLLVM.so.87 target_link_options(LLVM PRIVATE LINKER:-Bsymbolic-functions)88 endif()89 endif()90 endif()91 92 target_link_libraries(LLVM PRIVATE ${LIB_NAMES})93 94 if(LLVM_ENABLE_THREADS AND NOT HAVE_CXX_ATOMICS64_WITHOUT_LIB)95 target_link_libraries(LLVM PUBLIC atomic)96 endif()97 98 if (APPLE)99 set_property(TARGET LLVM APPEND_STRING PROPERTY100 LINK_FLAGS101 " -compatibility_version 1 -current_version ${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}.${LLVM_VERSION_PATCH}")102 endif()103 104 if(TARGET libLLVMExports)105 add_dependencies(LLVM libLLVMExports)106 endif()107endif()108 109if(LLVM_BUILD_LLVM_C_DYLIB AND NOT MSVC)110 if(NOT APPLE)111 message(FATAL_ERROR "Generating libLLVM-c is only supported on Darwin")112 endif()113 114 if(NOT LLVM_BUILD_LLVM_DYLIB)115 message(FATAL_ERROR "Generating libLLVM-c requires LLVM_BUILD_LLVM_C_DYLIB on Darwin")116 endif()117 118 # To get the export list for a single llvm library:119 # nm ${LIB_PATH} | awk "/T _LLVM/ { print $3 }" | sort -u | sed -e "s/^_//g" > ${LIB_PATH}.exports120 121 set(LLVM_EXPORTED_SYMBOL_FILE ${LLVM_BINARY_DIR}/libllvm-c.exports)122 123 set(LIB_DIR ${LLVM_LIBRARY_DIR})124 set(LIB_NAME ${LIB_DIR}/${CMAKE_SHARED_LIBRARY_PREFIX}LLVM)125 set(LIB_PATH ${LIB_NAME}${CMAKE_SHARED_LIBRARY_SUFFIX})126 set(LIB_EXPORTS_PATH ${LIB_NAME}.exports)127 list(APPEND LLVM_DYLIB_REQUIRED_EXPORTS ${LIB_EXPORTS_PATH})128 129 add_custom_command(OUTPUT ${LLVM_EXPORTED_SYMBOL_FILE}130 COMMAND nm ${LIB_PATH} | awk "/T _LLVM/ || /T LLVM/ { print $3 }" | sort -u | sed -e "s/^_//g" > ${LLVM_EXPORTED_SYMBOL_FILE}131 WORKING_DIRECTORY ${LIB_DIR}132 DEPENDS LLVM133 COMMENT "Generating Export list for LLVM..."134 VERBATIM )135 136 add_custom_target(libLLVMCExports DEPENDS ${LLVM_EXPORTED_SYMBOL_FILE})137 138 add_llvm_library(LLVM-C SHARED ${SOURCES} INSTALL_WITH_TOOLCHAIN)139 140 target_link_libraries(LLVM-C PUBLIC LLVM)141 add_dependencies(LLVM-C libLLVMCExports)142 143 set_property(TARGET LLVM-C APPEND_STRING PROPERTY144 LINK_FLAGS145 " -compatibility_version 1 -current_version ${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}.${LLVM_VERSION_PATCH} -Wl,-reexport_library ${LIB_PATH}")146endif()147 148if(LLVM_BUILD_LLVM_C_DYLIB AND MSVC)149 # Build the LLVM-C.dll library that exports the C API.150 151 set(LLVM_LINK_COMPONENTS152 ${LLVM_DYLIB_COMPONENTS}153 )154 155 llvm_map_components_to_libnames(LIB_NAMES ${LLVM_DYLIB_COMPONENTS})156 list(REMOVE_DUPLICATES LIB_NAMES)157 158 # The python script needs to know whether symbols are prefixed with underscores or not.159 if(LLVM_HOST_TRIPLE MATCHES "i?86-.*win.*")160 set(GEN_UNDERSCORE "--underscore")161 else()162 set(GEN_UNDERSCORE "")163 endif()164 165 # Set this name here, not used in multi conf loop,166 # but add script will pick the right one.167 set(LIBSFILE ${LLVM_BINARY_DIR}/${CMAKE_CFG_INTDIR}/libllvm-c.args)168 169 # Get the full name to the libs so the python script understands them.170 foreach(lib ${LIB_NAMES})171 list(APPEND FULL_LIB_NAMES ${LLVM_LIBRARY_DIR}/${lib}.lib)172 endforeach()173 174 # Need to separate lib names with newlines.175 string(REPLACE ";" "\n" FILE_CONTENT "${FULL_LIB_NAMES}")176 177 if("${CMAKE_CFG_INTDIR}" STREQUAL ".")178 # Write out the full lib names into file to be read by the python script.179 file(WRITE ${LIBSFILE} "${FILE_CONTENT}")180 else()181 foreach(BUILD_MODE ${CMAKE_CONFIGURATION_TYPES})182 # Replace the special string with a per config directory.183 string(REPLACE ${CMAKE_CFG_INTDIR} ${BUILD_MODE} PER_CONF_CONTENT "${FILE_CONTENT}")184 185 # Write out the full lib names into file to be read by the python script.186 # One libsfile per build, the add_custom_command should expand187 # ${CMAKE_CFG_INTDIR} correctly and select the right one.188 file(WRITE ${LLVM_BINARY_DIR}/${BUILD_MODE}/libllvm-c.args "${PER_CONF_CONTENT}")189 endforeach()190 endif()191 192 # Generate the exports file dynamically.193 set(GEN_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/gen-msvc-exports.py)194 195 set(LLVM_EXPORTED_SYMBOL_FILE ${LLVM_BINARY_DIR}/${CMAKE_CFG_INTDIR}/libllvm-c.exports)196 get_host_tool_path(llvm-nm LLVM_NM llvm_nm_exe llvm_nm_target)197 198 add_custom_command(OUTPUT ${LLVM_EXPORTED_SYMBOL_FILE}199 COMMAND "${Python3_EXECUTABLE}" ${GEN_SCRIPT} --libsfile ${LIBSFILE} ${GEN_UNDERSCORE} --nm "${llvm_nm_exe}" -o ${LLVM_EXPORTED_SYMBOL_FILE}200 DEPENDS ${LIB_NAMES} ${llvm_nm_target}201 COMMENT "Generating export list for LLVM-C"202 VERBATIM )203 204 # Finally link the target.205 add_llvm_library(LLVM-C SHARED INSTALL_WITH_TOOLCHAIN ${SOURCES} DEPENDS intrinsics_gen)206 207 if (LLVM_INTEGRATED_CRT_ALLOC AND MSVC)208 # Make sure we search LLVMSupport first, before the CRT libs209 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${CMAKE_CXX_LINKER_WRAPPER_FLAG}-INCLUDE:malloc")210 endif()211 212endif()213