re PR target/70296 (Incorrect handling of vector X; if X is function-like macro)

PR target/70296
	* include/cpplib.h (cpp_fun_like_macro_p): New prototype.
	* macro.c (cpp_fun_like_macro_p): New function.

	* config/rs6000/rs6000-c.c (rs6000_macro_to_expand): If IDENT is
	function-like macro, peek following token(s) if it is followed
	by CPP_OPEN_PAREN token with optional padding in between, and
	if not, don't treat it like a macro.

	* gcc.target/powerpc/altivec-36.c: New test.

From-SVN: r234371

libcpp/ChangeLog

@@ -1,3 +1,9 @@
+2016-03-21  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/70296
+	* include/cpplib.h (cpp_fun_like_macro_p): New prototype.
+	* macro.c (cpp_fun_like_macro_p): New function.
+
 2016-03-15  Richard Henderson  <rth@redhat.com>
 
 	* line-map.c (new_linemap): Make alloc_size a size_t.

libcpp/include/cpplib.h

@@ -813,6 +813,7 @@ extern int cpp_avoid_paste (cpp_reader *, const cpp_token *,
 extern const cpp_token *cpp_get_token (cpp_reader *);
 extern const cpp_token *cpp_get_token_with_location (cpp_reader *,
 						     source_location *);
+extern bool cpp_fun_like_macro_p (cpp_hashnode *);
 extern const unsigned char *cpp_macro_definition (cpp_reader *,
 						  cpp_hashnode *);
 extern void _cpp_backup_tokens (cpp_reader *, unsigned int);

libcpp/macro.c

@@ -3301,6 +3301,15 @@ check_trad_stringification (cpp_reader *pfile, const cpp_macro *macro,
     }
 }
 
+/* Returns true of NODE is a function-like macro.  */
+bool
+cpp_fun_like_macro_p (cpp_hashnode *node)
+{
+  return (node->type == NT_MACRO
+	  && (node->flags & (NODE_BUILTIN | NODE_MACRO_ARG)) == 0
+	  && node->value.macro->fun_like);
+}
+
 /* Returns the name, arguments and expansion of a macro, in a format
    suitable to be read back in again, and therefore also for DWARF 2
    debugging info.  e.g. "PASTE(X, Y) X ## Y", or "MACNAME EXPANSION".