[CMake] add_clang_library(MODULE): Create a phony target when llvm_add_library(MODULE) gave up.

llvm-svn: 201319

clang/CMakeLists.txt

@@ -311,6 +311,7 @@ macro(add_clang_library name)
   endif()
   llvm_add_library(${name} ${ARG_UNPARSED_ARGUMENTS} ${srcs})
 
+  if(TARGET ${name})
     target_link_libraries( ${name} ${LLVM_COMMON_LIBS} )
 
     if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY OR ${name} STREQUAL "libclang")
@@ -319,6 +320,10 @@ macro(add_clang_library name)
         ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
         RUNTIME DESTINATION bin)
     endif()
+  else()
+    # Add empty "phony" target
+    add_custom_target(${name})
+  endif()
 
   set_target_properties(${name} PROPERTIES FOLDER "Clang libraries")
 endmacro(add_clang_library)