# The SOVERSION should be updated only if a change is made to the libclang
# ABI, and when it is updated, it should be updated to the current
# LLVM_VERSION_MAJOR.
# Please also see clang/tools/libclang/libclang.map

# This option defaults to CLANG_FORCE_MATCHING_LIBCLANG_SOVERSION
# to ON - which means that it by default matches CLANG_VERSION_MAJOR
#
# TODO: This should probably not be a option going forward but we
# we should commit to a way to do it. But due to getting this out
# in LLVM 15.x we opted for a option.
set(LIBCLANG_SOVERSION_ARG)
if(NOT CLANG_FORCE_MATCHING_LIBCLANG_SOVERSION)
  set(LIBCLANG_SOVERSION_ARG SOVERSION 13)
endif()

# TODO: harmonize usage of LIBCLANG_SOVERSION / LIBCLANG_LIBARY_VERSION
#       below; this was added under time-pressure to avoid reverting the
#       better default from LLVM 14 for LLVM 15.0.0-rc3, hence no time
#       to clean up previous inconsistencies.

set(SOURCES
  ARCMigrate.cpp
  BuildSystem.cpp
  CCAS.cpp
  CDependencies.cpp
  CIndex.cpp
  CIndexCXX.cpp
  CIndexCodeCompletion.cpp
  CIndexDiagnostic.cpp
  CIndexHigh.cpp
  CIndexInclusionStack.cpp
  CIndexUSRs.cpp
  CIndexer.cpp
  CRefactor.cpp
  CXComment.cpp
  CXCursor.cpp
  CXError.cpp
  CXExtractAPI.cpp
  CXIndexDataConsumer.cpp
  CXCompilationDatabase.cpp
  CXLoadedDiagnostic.cpp
  CXSourceLocation.cpp
  CXStoredDiagnostic.cpp
  CXString.cpp
  CXType.cpp
  Driver.cpp
  Indexing.cpp
  FatalErrorHandler.cpp
  Rewrite.cpp

  ADDITIONAL_HEADERS
  CIndexDiagnostic.h
  CIndexer.h
  CXCursor.h
  CXLoadedDiagnostic.h
  CXSourceLocation.h
  CXString.h
  CXTranslationUnit.h
  CXType.h
  Index_Internal.h
  ../../include/clang-c/Index.h
  )

set(LIBS
  clangAST
  clangASTMatchers
  clangAPINotes
  clangBasic
  clangDependencyScanning
  clangDriver
  clangExtractAPI
  clangFrontend
  clangIndex
  clangLex
  clangRewrite
  clangSema
  clangSerialization
  clangTooling
  clangToolingRefactor
  clangToolingSyntax
)

if (CLANG_ENABLE_ARCMT)
  list(APPEND LIBS clangARCMigrate)
endif ()

if (HAVE_LIBDL)
  list(APPEND LIBS ${CMAKE_DL_LIBS})
elseif (CLANG_BUILT_STANDALONE)
  find_library(DL_LIBRARY_PATH dl)
  if (DL_LIBRARY_PATH)
    list(APPEND LIBS dl)
  endif ()
endif ()

option(LIBCLANG_BUILD_STATIC
  "Build libclang as a static library (in addition to a shared one)" OFF)

set(LLVM_EXPORTED_SYMBOL_FILE ${CMAKE_CURRENT_BINARY_DIR}/libclang-generic.exports)
set(LIBCLANG_VERSION_SCRIPT_FILE ${CMAKE_CURRENT_SOURCE_DIR}/libclang.map)

if(MSVC)
  # Avoid LNK4197 by not specifying libclang.exports here.
  # Each functions is exported as "dllexport" in include/clang-c.
  # KB835326
  set(LLVM_EXPORTED_SYMBOL_FILE)
endif()

if (UNIX AND NOT APPLE)
  set(LLVM_EXPORTED_SYMBOL_FILE)
  set(USE_VERSION_SCRIPT ${LLVM_HAVE_LINK_VERSION_SCRIPT})
endif()

if (LLVM_EXPORTED_SYMBOL_FILE)
  add_custom_command(OUTPUT ${LLVM_EXPORTED_SYMBOL_FILE}
                     COMMAND "${Python3_EXECUTABLE}"
                       ARGS ${CMAKE_CURRENT_SOURCE_DIR}/linker-script-to-export-list.py
                            ${LIBCLANG_VERSION_SCRIPT_FILE}
                            ${LLVM_EXPORTED_SYMBOL_FILE}
                     DEPENDS ${LIBCLANG_VERSION_SCRIPT_FILE})
endif()

if(LLVM_ENABLE_PIC OR (WIN32 AND NOT LIBCLANG_BUILD_STATIC))
  set(ENABLE_SHARED SHARED)
endif()

if(NOT LLVM_ENABLE_PIC OR LIBCLANG_BUILD_STATIC)
  set(ENABLE_STATIC STATIC)
endif()

if (MSVC AND ENABLE_SHARED AND ENABLE_STATIC)
  unset(ENABLE_STATIC)
endif()

if(MSVC)
  set(output_name "libclang")
else()
  set(output_name "clang")
endif()

# libclang requires headers which need _ALL_SOURCE to build on AIX
if (UNIX AND ${CMAKE_SYSTEM_NAME} MATCHES "AIX")
    remove_definitions("-D_XOPEN_SOURCE=700")
endif()

add_clang_library(libclang ${ENABLE_SHARED} ${ENABLE_STATIC} INSTALL_WITH_TOOLCHAIN
  OUTPUT_NAME ${output_name}
  ${SOURCES}

  DEPENDS
  ClangDriverOptions
  clang-resource-headers

  LINK_LIBS
  ${LIBS}

  LINK_COMPONENTS
  ${LLVM_TARGETS_TO_BUILD}
  Core
  Support
  TargetParser
  # NOTE: The following were added to keep BUILD_SHARED_LIBS=TRUE working on
  # Apple's downstream branch. They are not required upstream at the moment.
  Option
  FrontendOpenMP
  )

if(ENABLE_STATIC)
  foreach(name libclang obj.libclang libclang_static)
    if (TARGET ${name})
      target_compile_definitions(${name} PUBLIC CINDEX_NO_EXPORTS)
    endif()
  endforeach()
endif()

if(ENABLE_SHARED)
  if(WIN32)
    set_target_properties(libclang
      PROPERTIES
      VERSION ${LIBCLANG_LIBRARY_VERSION}
      DEFINE_SYMBOL _CINDEX_LIB_)
  elseif(APPLE)
    set(LIBCLANG_LINK_FLAGS " -Wl,-compatibility_version -Wl,1")
    set(LIBCLANG_LINK_FLAGS "${LIBCLANG_LINK_FLAGS} -Wl,-current_version -Wl,${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}.${LLVM_VERSION_PATCH}")

    set_property(TARGET libclang APPEND_STRING PROPERTY
                 LINK_FLAGS ${LIBCLANG_LINK_FLAGS})
  else()
    set_target_properties(libclang
      PROPERTIES
      VERSION ${LIBCLANG_LIBRARY_VERSION}
      DEFINE_SYMBOL _CINDEX_LIB_)
    # FIXME: _CINDEX_LIB_ affects dllexport/dllimport on Win32.
    if(LLVM_ENABLE_MODULES AND NOT WIN32)
      target_compile_options(libclang PRIVATE
        "-fmodules-ignore-macro=_CINDEX_LIB_"
        )
    endif()
  endif()
  if (USE_VERSION_SCRIPT)
    target_link_options(libclang PRIVATE "-Wl,--version-script,${CMAKE_CURRENT_SOURCE_DIR}/libclang.map")
    # The Solaris 11.4 linker supports a subset of GNU ld version scripts,
    # but requires a special option to enable it.
    if (${CMAKE_SYSTEM_NAME} MATCHES "SunOS")
      target_link_options(libclang PRIVATE "-Wl,-z,gnu-version-script-compat")
    endif()
    # Ensure that libclang.so gets rebuilt when the linker script changes.
    set_property(SOURCE ARCMigrate.cpp APPEND PROPERTY
                 OBJECT_DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/libclang.map)

    set_target_properties(libclang PROPERTIES
                          VERSION ${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}.${LLVM_VERSION_PATCH}${LLVM_VERSION_SUFFIX}
                          ${LIBCLANG_SOVERSION_ARG})
  endif()
endif()

if(INTERNAL_INSTALL_PREFIX)
  set(LIBCLANG_HEADERS_INSTALL_DESTINATION "${INTERNAL_INSTALL_PREFIX}/include")
else()
  set(LIBCLANG_HEADERS_INSTALL_DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}")
endif()

install(DIRECTORY ../../include/clang-c
  COMPONENT libclang-headers
  DESTINATION "${LIBCLANG_HEADERS_INSTALL_DESTINATION}"
  FILES_MATCHING
  PATTERN "*.h"
  )

# LLVM_DISTRIBUTION_COMPONENTS requires that each component have both a
# component and an install-component target, so add a dummy libclang-headers
# target to allow using it in LLVM_DISTRIBUTION_COMPONENTS.
add_custom_target(libclang-headers)
set_target_properties(libclang-headers PROPERTIES FOLDER "Misc")

if (NOT LLVM_ENABLE_IDE)
  add_llvm_install_targets(install-libclang-headers
                           COMPONENT libclang-headers)
endif()

# Create a target to install the python bindings to make them easier to
# distribute.  Since the bindings are over libclang, which is installed
# unbundled to the clang version, follow suit.
foreach(PythonVersion ${CLANG_PYTHON_BINDINGS_VERSIONS})
  install(DIRECTORY
            ${CMAKE_CURRENT_SOURCE_DIR}/../../bindings/python/clang
          COMPONENT
            libclang-python-bindings
          DESTINATION
            "lib${LLVM_LIBDIR_SUFFIX}/python${PythonVersion}/site-packages")
endforeach()
if(NOT LLVM_ENABLE_IDE)
  add_custom_target(libclang-python-bindings)
  add_llvm_install_targets(install-libclang-python-bindings
                           COMPONENT
                             libclang-python-bindings)
endif()