tools/llvm-shlib/CMakeLists.txt

   1 # This tool creates a shared library from the LLVM libraries. Generating this
   2 # library is enabled by setting LLVM_BUILD_LLVM_DYLIB=yes on the CMake
   3 # commandline. By default the shared library only exports the LLVM C API.
   4
   5 add_definitions( -DLLVM_VERSION_INFO=\"${PACKAGE_VERSION}\" )
   6
   7 set(SOURCES
   8   libllvm.cpp
   9   )
  10
  11 llvm_map_components_to_libnames(LIB_NAMES ${LLVM_DYLIB_COMPONENTS})
  12
  13 if(LLVM_LINK_LLVM_DYLIB)
  14   if(NOT LLVM_DYLIB_EXPORT_ALL)
  15     message(FATAL_ERROR "LLVM_DYLIB_EXPORT_ALL must be ON when LLVM_LINK_LLVM_DYLIB is ON")
  16   endif()
  17
  18   # libLLVM.so should not have any dependencies on any other LLVM
  19   # shared libraries. When using the "all" pseudo-component,
  20   # LLVM_AVAILABLE_LIBS is added to the dependencies, which may
  21   # contain shared libraries (e.g. libLTO).
  22   #
  23   # Also exclude libLLVMTableGen for the following reasons:
  24   #  - it is only used by internal *-tblgen utilities;
  25   #  - it pollutes the global options space.
  26   foreach(lib ${LIB_NAMES})
  27     get_target_property(t ${lib} TYPE)
  28     if("${lib}" STREQUAL "LLVMTableGen")
  29     elseif("x${t}" STREQUAL "xSTATIC_LIBRARY")
  30       list(APPEND FILTERED_LIB_NAMES ${lib})
  31     endif()
  32   endforeach()
  33   set(LIB_NAMES ${FILTERED_LIB_NAMES})
  34 endif()
  35
  36 if(NOT DEFINED LLVM_DYLIB_EXPORTED_SYMBOL_FILE)
  37
  38   if( WIN32 AND NOT CYGWIN )
  39     message(FATAL_ERROR "Auto-generation not implemented for Win32 without GNU utils. Please specify LLVM_EXPORTED_SYMBOL_FILE.")
  40   endif()
  41
  42   # To get the export list for a single llvm library:
  43   # nm ${LIB_PATH} | awk "/T _LLVM/ { print $3 }" | sort -u | sed -e "s/^_//g" > ${LIB_PATH}.exports
  44
  45   set(LLVM_EXPORTED_SYMBOL_FILE ${CMAKE_BINARY_DIR}/libllvm.exports)
  46
  47   if (NOT LLVM_DYLIB_EXPORT_ALL)
  48     foreach (lib ${LIB_NAMES})
  49       set(LIB_DIR ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX})
  50       set(LIB_NAME ${LIB_DIR}/${CMAKE_STATIC_LIBRARY_PREFIX}${lib})
  51       set(LIB_PATH ${LIB_NAME}${CMAKE_STATIC_LIBRARY_SUFFIX})
  52       set(LIB_EXPORTS_PATH ${LIB_NAME}.exports)
  53       list(APPEND LLVM_DYLIB_REQUIRED_EXPORTS ${LIB_EXPORTS_PATH})
  54
  55
  56       add_custom_command(OUTPUT ${LIB_EXPORTS_PATH}
  57         COMMAND nm ${LIB_PATH} | awk "/T _LLVM/ || /T LLVM/ { print $3 }" | sort -u | sed -e "s/^_//g" > ${LIB_EXPORTS_PATH}
  58         WORKING_DIRECTORY ${LIB_DIR}
  59         DEPENDS ${lib}
  60         COMMENT "Generating Export list for ${lib}..."
  61         VERBATIM )
  62     endforeach ()
  63   endif()
  64
  65   if (LLVM_DYLIB_EXPORT_ALL)
  66     add_custom_command(OUTPUT ${LLVM_EXPORTED_SYMBOL_FILE}
  67       COMMAND echo \"LLVM*\" > ${LLVM_EXPORTED_SYMBOL_FILE} && echo \"_Z*llvm*\" >> ${LLVM_EXPORTED_SYMBOL_FILE}
  68       WORKING_DIRECTORY ${LIB_DIR}
  69       DEPENDS ${LLVM_DYLIB_REQUIRED_EXPORTS}
  70       COMMENT "Generating combined export list...")
  71   else()
  72     add_custom_command(OUTPUT ${LLVM_EXPORTED_SYMBOL_FILE}
  73       COMMAND cat ${LLVM_DYLIB_REQUIRED_EXPORTS} > ${LLVM_EXPORTED_SYMBOL_FILE}
  74       WORKING_DIRECTORY ${LIB_DIR}
  75       DEPENDS ${LLVM_DYLIB_REQUIRED_EXPORTS}
  76       COMMENT "Generating combined export list...")
  77   endif()
  78
  79   add_custom_target(libLLVMExports DEPENDS ${LLVM_EXPORTED_SYMBOL_FILE})
  80 else()
  81   set(LLVM_EXPORTED_SYMBOL_FILE ${LLVM_DYLIB_EXPORTED_SYMBOL_FILE})
  82   add_custom_target(libLLVMExports DEPENDS ${LLVM_EXPORTED_SYMBOL_FILE})
  83 endif()
  84
  85 add_llvm_library(LLVM SHARED DISABLE_LLVM_LINK_LLVM_DYLIB ${SOURCES})
  86
  87 list(REMOVE_DUPLICATES LIB_NAMES)
  88 if("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux") # FIXME: It should be "GNU ld for elf"
  89   # GNU ld doesn't resolve symbols in the version script.
  90   set(LIB_NAMES -Wl,--whole-archive ${LIB_NAMES} -Wl,--no-whole-archive)
  91 elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "Darwin")
  92   set(LIB_NAMES -Wl,-all_load ${LIB_NAMES})
  93 endif()
  94
  95 target_link_libraries(LLVM PRIVATE ${LIB_NAMES})
  96
  97 add_dependencies(LLVM libLLVMExports)
  98
  99 if (APPLE)
 100   set_property(TARGET LLVM APPEND_STRING PROPERTY
 101               LINK_FLAGS
 102               " -compatibility_version ${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR} -current_version ${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}")
 103 endif()
 104