[libclang] Some changes on the linker options for libclang on a CMake build.

- Use the 'libclang.exports' file.
- Pass -Wl,-current_version
- Set install name to "@rpath"

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@194134 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 39 insertions, 0 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 69679538f7..8d02bf05f8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -199,6 +199,41 @@ function(clang_tablegen)
   endif()
 endfunction(clang_tablegen)
 
+# FIXME: Generalize and move to llvm.
+function(add_clang_symbol_exports target_name export_file)
+  # Makefile.rules contains special cases for different platforms.
+  # We restrict ourselves to Darwin for the time being.
+  if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
+    add_custom_command(OUTPUT symbol.exports
+      COMMAND sed -e "s/^/_/" < ${export_file} > symbol.exports
+      DEPENDS ${export_file}
+      VERBATIM
+      COMMENT "Creating export file for ${target_name}")
+    add_custom_target(${target_name}_exports DEPENDS symbol.exports)
+    set_property(DIRECTORY APPEND
+      PROPERTY ADDITIONAL_MAKE_CLEAN_FILES symbol.exports)
+
+    get_property(srcs TARGET ${target_name} PROPERTY SOURCES)
+    foreach(src ${srcs})
+      get_filename_component(extension ${src} EXT)
+      if(extension STREQUAL ".cpp")
+        set(first_source_file ${src})
+        break()
+      endif()
+    endforeach()
+  
+    # Force re-linking when the exports file changes. Actually, it
+    # forces recompilation of the source file. The LINK_DEPENDS target
+    # property only works for makefile-based generators.
+    set_property(SOURCE ${first_source_file} APPEND PROPERTY
+      OBJECT_DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/symbol.exports)
+  
+    set_property(TARGET ${target_name} APPEND_STRING PROPERTY
+                 LINK_FLAGS " -Wl,-exported_symbols_list,${CMAKE_CURRENT_BINARY_DIR}/symbol.exports")
+    add_dependencies(${target_name} ${target_name}_exports)
+  endif()
+endfunction(add_clang_symbol_exports)
+
 macro(add_clang_library name)
   llvm_process_sources(srcs ${ARGN})
   if(MSVC_IDE OR XCODE)
@@ -238,6 +273,10 @@ macro(add_clang_library name)
   llvm_config( ${name} ${LLVM_LINK_COMPONENTS} )
   target_link_libraries( ${name} ${LLVM_COMMON_LIBS} )
   link_system_libs( ${name} )
+  
+  if (SHARED_LIBRARY AND EXPORTED_SYMBOL_FILE)
+    add_clang_symbol_exports( ${name} ${EXPORTED_SYMBOL_FILE} ) 
+  endif()
 
   if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY OR ${name} STREQUAL "libclang")
     install(TARGETS ${name}