Add two missing entries to the C++11 support page. Bump one relevant diagnostic

(for an integer too large for any signed type) from Warning to ExtWarn -- it's
ill-formed in C++11 and C99 onwards, and UB during translation in C89 and
C++98. Add diagnostic groups for two relevant diagnostics.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@203974 91177308-0d34-0410-b5e6-96231b3b80d8

6 files changed, 20 insertions, 11 deletions

diff --git a/include/clang/Basic/DiagnosticCommonKinds.td b/include/clang/Basic/DiagnosticCommonKinds.td
index 09d43f382b..0430b1dc27 100644
--- a/include/clang/Basic/DiagnosticCommonKinds.td
+++ b/include/clang/Basic/DiagnosticCommonKinds.td
@@ -104,8 +104,9 @@ def warn_cxx98_compat_longlong : Warning<
   InGroup<CXX98CompatPedantic>, DefaultIgnore;
 def err_integer_too_large : Error<
   "integer constant is larger than the largest unsigned integer type">;
-def warn_integer_too_large_for_signed : Warning<
-  "integer constant is larger than the largest signed integer type">;
+def ext_integer_too_large_for_signed : ExtWarn<
+  "integer constant is larger than the largest signed integer type">,
+  InGroup<DiagGroup<"implicitly-unsigned-literal">>;
 
 // Sema && AST
 def note_invalid_subexpr_in_const_expr : Note<
diff --git a/include/clang/Basic/DiagnosticLexKinds.td b/include/clang/Basic/DiagnosticLexKinds.td
index 183074340f..86b0f080fb 100644
--- a/include/clang/Basic/DiagnosticLexKinds.td
+++ b/include/clang/Basic/DiagnosticLexKinds.td
@@ -151,7 +151,8 @@ def warn_ucn_not_valid_in_c89_literal : ExtWarn<
 // Literal
 def ext_nonstandard_escape : Extension<
   "use of non-standard escape character '\\%0'">;
-def ext_unknown_escape : ExtWarn<"unknown escape sequence '\\%0'">;
+def ext_unknown_escape : ExtWarn<"unknown escape sequence '\\%0'">,
+  InGroup<DiagGroup<"unknown-escape-sequence">>;
 def err_invalid_decimal_digit : Error<"invalid digit '%0' in decimal constant">;
 def err_invalid_binary_digit : Error<"invalid digit '%0' in binary constant">;
 def err_invalid_octal_digit : Error<"invalid digit '%0' in octal constant">;
diff --git a/lib/Lex/PPExpressions.cpp b/lib/Lex/PPExpressions.cpp
index f7c3be9958..6975d31bab 100644
--- a/lib/Lex/PPExpressions.cpp
+++ b/lib/Lex/PPExpressions.cpp
@@ -258,9 +258,10 @@ static bool EvaluateValue(PPValue &Result, Token &PeekTok, DefinedTracker &DT,
       // large that it is unsigned" e.g. on 12345678901234567890 where intmax_t
       // is 64-bits.
       if (!Literal.isUnsigned && Result.Val.isNegative()) {
-        // Don't warn for a hex or octal literal: 0x8000..0 shouldn't warn.
+        // Octal, hexadecimal, and binary literals are implicitly unsigned if
+        // the value does not fit into a signed integer type.
         if (ValueLive && Literal.getRadix() == 10)
-          PP.Diag(PeekTok, diag::warn_integer_too_large_for_signed);
+          PP.Diag(PeekTok, diag::ext_integer_too_large_for_signed);
         Result.Val.setIsUnsigned(true);
       }
     }
diff --git a/lib/Sema/SemaExpr.cpp b/lib/Sema/SemaExpr.cpp
index 51daf856d5..72ac597b15 100644
--- a/lib/Sema/SemaExpr.cpp
+++ b/lib/Sema/SemaExpr.cpp
@@ -3210,7 +3210,7 @@ ExprResult Sema::ActOnNumericConstant(const Token &Tok, Scope *UDLScope) {
       // If we still couldn't decide a type, we probably have something that
       // does not fit in a signed long long, but has no U suffix.
       if (Ty.isNull()) {
-        Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed);
+        Diag(Tok.getLocation(), diag::ext_integer_too_large_for_signed);
         Ty = Context.UnsignedLongLongTy;
         Width = Context.getTargetInfo().getLongLongWidth();
       }
diff --git a/test/Misc/warning-flags.c b/test/Misc/warning-flags.c
index d1653b4c05..07a7fa5035 100644
--- a/test/Misc/warning-flags.c
+++ b/test/Misc/warning-flags.c
@@ -18,7 +18,7 @@ This test serves two purposes:
 
 The list of warnings below should NEVER grow.  It should gradually shrink to 0.
 
-CHECK: Warnings without flags (108):
+CHECK: Warnings without flags (106):
 CHECK-NEXT:   ext_delete_void_ptr_operand
 CHECK-NEXT:   ext_expected_semi_decl_list
 CHECK-NEXT:   ext_explicit_specialization_storage_class
@@ -35,7 +35,6 @@ CHECK-NEXT:   ext_typecheck_cond_incompatible_operands
 CHECK-NEXT:   ext_typecheck_cond_incompatible_operands_nonstandard
 CHECK-NEXT:   ext_typecheck_ordered_comparison_of_function_pointers
 CHECK-NEXT:   ext_typecheck_ordered_comparison_of_pointer_integer
-CHECK-NEXT:   ext_unknown_escape
 CHECK-NEXT:   ext_using_undefined_std
 CHECK-NEXT:   pp_include_next_absolute_path
 CHECK-NEXT:   pp_include_next_in_primary
@@ -83,7 +82,6 @@ CHECK-NEXT:   warn_implements_nscopying
 CHECK-NEXT:   warn_incompatible_qualified_id
 CHECK-NEXT:   warn_initializer_string_for_char_array_too_long
 CHECK-NEXT:   warn_inline_namespace_reopened_noninline
-CHECK-NEXT:   warn_integer_too_large_for_signed
 CHECK-NEXT:   warn_invalid_asm_cast_lvalue
 CHECK-NEXT:   warn_maynot_respond
 CHECK-NEXT:   warn_method_param_redefinition
diff --git a/www/cxx_status.html b/www/cxx_status.html
index b29d587a94..0849bbcdcf 100644
--- a/www/cxx_status.html
+++ b/www/cxx_status.html
@@ -205,8 +205,16 @@ currently requires the C++ runtime library from g++-4.8 or later.</p>
       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2341.pdf">N2341</a></td>
       <td class="full" align="center">Clang 3.3</td>
     </tr>
-    <!-- Skipped N1627: Conditionally-support behavior -->
-    <!-- Skipped N1727: Changing Undefined Behavior into Diagnosable Errors -->
+    <tr>
+      <td>Conditionally-support behavior</td>
+      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1627.pdf">N1627</a></td>
+      <td class="full" align="center">Clang 2.9</td>
+    </tr>
+    <tr>
+      <td>Changing undefined behavior into diagnosable errors</td>
+      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1727.pdf">N1727</a></td>
+      <td class="full" align="center">Clang 2.9</td>
+    </tr>
     <tr>
       <td>Delegating constructors</td>
       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1986.pdf">N1986</a></td>