Clarify warn_cxx98_compat_attribute diagnostic

Various attribute flavours are supported in C++98. Make it clear that this
compatibility warning relates specifically to C++11-style generalized
attributes.

llvm-svn: 199053

Author: atoker

clang/include/clang/Basic/DiagnosticParseKinds.td

@@ -517,7 +517,7 @@ def warn_cxx98_compat_nullptr : Warning<
 def warn_cxx98_compat_alignas : Warning<"'alignas' is incompatible with C++98">,
   InGroup<CXX98Compat>, DefaultIgnore;
 def warn_cxx98_compat_attribute : Warning<
-  "attributes are incompatible with C++98">,
+  "generalized attributes are incompatible with C++98">,
   InGroup<CXX98Compat>, DefaultIgnore;
 def err_cxx11_attribute_forbids_arguments : Error<
   "attribute '%0' cannot have an argument list">;

clang/test/SemaCXX/cxx98-compat.cpp

@@ -23,7 +23,7 @@ template<int ...I>  // expected-warning {{variadic templates are incompatible wi
 class Variadic3 {};
 
 alignas(8) int with_alignas; // expected-warning {{'alignas' is incompatible with C++98}}
-int with_attribute [[ ]]; // expected-warning {{attributes are incompatible with C++98}}
+int with_attribute [[ ]]; // expected-warning {{generalized attributes are incompatible with C++98}}
 
 void Literals() {
   (void)u8"str"; // expected-warning {{unicode literals are incompatible with C++98}}