tree.c (build_common_builtin_nodes): Do not use TM_PURE attribute unless…

tree.c (build_common_builtin_nodes): Do not use TM_PURE attribute unless language has support for TM.

        PR/51291
        * tree.c (build_common_builtin_nodes): Do not use TM_PURE
        attribute unless language has support for TM.
        * config/i386/i386.c (ix86_init_tm_builtins): Exit gracefully in
        the absence of TM builtins.

From-SVN: r182179

gcc/ChangeLog

+2011-12-09  Aldy Hernandez  <aldyh@redhat.com>
+
+	PR/51291
+	* tree.c (build_common_builtin_nodes): Do not use TM_PURE
+	attribute unless language has support for TM.
+	* config/i386/i386.c (ix86_init_tm_builtins): Exit gracefully in
+	the absence of TM builtins.
+
 2011-12-09  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gimple-fold.c (gimple_fold_stmt_to_constant_1) <GIMPLE_UNARY_RHS>:

gcc/config/i386/i386.c

@@ -27023,6 +27023,11 @@ ix86_init_tm_builtins (void)
   if (!flag_tm)
     return;
 
+  /* If there are no builtins defined, we must be compiling in a
+     language without trans-mem support.  */
+  if (!builtin_decl_explicit_p (BUILT_IN_TM_LOAD_1))
+    return;
+
   /* Use whatever attributes a normal TM load has.  */
   decl = builtin_decl_explicit (BUILT_IN_TM_LOAD_1);
   attrs_load = DECL_ATTRIBUTES (decl);

gcc/testsuite/gfortran.dg/trans-mem-skel.f90

+! { dg-do compile }
+! { dg-options "-fgnu-tm" }
+program foo
+      real x
+end program foo

gcc/tree.c

@@ -9437,6 +9437,7 @@ void
 build_common_builtin_nodes (void)
 {
   tree tmp, ftype;
+  int ecf_flags;
 
   if (!builtin_decl_explicit_p (BUILT_IN_MEMCPY)
       || !builtin_decl_explicit_p (BUILT_IN_MEMMOVE))
@@ -9589,9 +9590,12 @@ build_common_builtin_nodes (void)
      its value in the landing pad.  */
   ftype = build_function_type_list (ptr_type_node,
 				    integer_type_node, NULL_TREE);
+  ecf_flags = ECF_PURE | ECF_NOTHROW | ECF_LEAF;
+  /* Only use TM_PURE if we we have TM language support.  */
+  if (builtin_decl_explicit_p (BUILT_IN_TM_LOAD_1))
+    ecf_flags |= ECF_TM_PURE;
   local_define_builtin ("__builtin_eh_pointer", ftype, BUILT_IN_EH_POINTER,
-			"__builtin_eh_pointer",
-			ECF_PURE | ECF_NOTHROW | ECF_LEAF | ECF_TM_PURE);
+			"__builtin_eh_pointer", ecf_flags);
 
   tmp = lang_hooks.types.type_for_mode (targetm.eh_return_filter_mode (), 0);
   ftype = build_function_type_list (tmp, integer_type_node, NULL_TREE);