c++: support C++11 attributes in C++98

I don't see any reason why we can't allow the [[]] attribute syntax in C++98
mode with a pedwarn just like many other C++11 features.  In fact, we
already do support it in some places in the grammar, but not in places that
check cp_nth_tokens_can_be_std_attribute_p.

Let's also follow the C front-end's lead in only warning about them when
-pedantic.

It still isn't necessary for this function to guard against Objective-C
message passing syntax; we handle that with tentative parsing in
cp_parser_statement, and we don't call this function in that context anyway.

gcc/cp/ChangeLog:

	* parser.cc (cp_nth_tokens_can_be_std_attribute_p): Don't check
	cxx_dialect.
	* error.cc (maybe_warn_cpp0x): Only complain about C++11 attributes
	if pedantic.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp0x/gen-attrs-1.C: Also run in C++98 mode.
	* g++.dg/cpp0x/gen-attrs-11.C: Likewise.
	* g++.dg/cpp0x/gen-attrs-13.C: Likewise.
	* g++.dg/cpp0x/gen-attrs-15.C: Likewise.
	* g++.dg/cpp0x/gen-attrs-75.C: Don't expect C++98 warning after
	__extension__.

1 files changed, 4 insertions, 3 deletions

diff --git a/gcc/cp/error.cc b/gcc/cp/error.cc
index 57cd76c..4a9e9aa 100644
--- a/gcc/cp/error.cc
+++ b/gcc/cp/error.cc
@@ -4735,9 +4735,10 @@ maybe_warn_cpp0x (cpp0x_warn_str str, location_t loc/*=input_location*/)
 		 "only available with %<-std=c++11%> or %<-std=gnu++11%>");
         break;
       case CPP0X_ATTRIBUTES:
-	pedwarn (loc, OPT_Wc__11_extensions,
-		 "C++11 attributes "
-		 "only available with %<-std=c++11%> or %<-std=gnu++11%>");
+	if (pedantic)
+	  pedwarn (loc, OPT_Wc__11_extensions,
+		   "C++11 attributes "
+		   "only available with %<-std=c++11%> or %<-std=gnu++11%>");
 	break;
       case CPP0X_REF_QUALIFIER:
 	pedwarn (loc, OPT_Wc__11_extensions,