Always -I clang/include when tblgen'ing in Clang.

clang/cmake/modules/AddClang.cmake

@@ -17,8 +17,9 @@ function(clang_tablegen)
     message(FATAL_ERROR "SOURCE source-file required by clang_tablegen")
   endif()
 
+  set( CLANG_TABLEGEN_ARGUMENTS -I ${CLANG_SOURCE_DIR}/include )
   set( LLVM_TARGET_DEFINITIONS ${CTG_SOURCE} )
-  tablegen(CLANG ${CTG_UNPARSED_ARGUMENTS})
+  tablegen(CLANG ${CTG_UNPARSED_ARGUMENTS} ${CLANG_TABLEGEN_ARGUMENTS})
 
   if(CTG_TARGET)
     add_public_tablegen_target(${CTG_TARGET})

clang/include/clang/AST/CMakeLists.txt

@@ -1,25 +1,20 @@
 clang_tablegen(Attrs.inc -gen-clang-attr-classes
-  -I ${CMAKE_CURRENT_SOURCE_DIR}/../../
   SOURCE ../Basic/Attr.td
   TARGET ClangAttrClasses)
 
 clang_tablegen(AttrImpl.inc -gen-clang-attr-impl
-  -I ${CMAKE_CURRENT_SOURCE_DIR}/../../
   SOURCE ../Basic/Attr.td
   TARGET ClangAttrImpl)
 
 clang_tablegen(AttrTextNodeDump.inc -gen-clang-attr-text-node-dump
-  -I ${CMAKE_CURRENT_SOURCE_DIR}/../../
   SOURCE ../Basic/Attr.td
   TARGET ClangAttrTextDump)
 
 clang_tablegen(AttrNodeTraverse.inc -gen-clang-attr-node-traverse
-  -I ${CMAKE_CURRENT_SOURCE_DIR}/../../
   SOURCE ../Basic/Attr.td
   TARGET ClangAttrTraverse)
 
 clang_tablegen(AttrVisitor.inc -gen-clang-attr-ast-visitor
-  -I ${CMAKE_CURRENT_SOURCE_DIR}/../../
   SOURCE ../Basic/Attr.td
   TARGET ClangAttrVisitor)
 

clang/include/clang/AST/TypeProperties.td

@@ -6,8 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-include "PropertiesBase.td"
-include "../Basic/TypeNodes.td"
+include "clang/AST/PropertiesBase.td"
+include "clang/Basic/TypeNodes.td"
 
 let Class = ComplexType in {
   def : Property<"elementType", QualType> {