Create a warning flag for 'warn_conv_*_not_used'

These warnings are grouped under '-Wclass-conversion' to be compatiable with GCC 9.

Differential Revision: https://reviews.llvm.org/D78442

diff --git a/clang/include/clang/Basic/DiagnosticGroups.td b/clang/include/clang/Basic/DiagnosticGroups.td
index 451310a..23f530d 100644 (file)
--- a/clang/include/clang/Basic/DiagnosticGroups.td
+++ b/clang/include/clang/Basic/DiagnosticGroups.td
@@ -60,6 +60,7 @@ def UndefinedBoolConversion : DiagGroup<"undefined-bool-conversion">;
 def BoolConversion : DiagGroup<"bool-conversion", [PointerBoolConversion,
                                                    UndefinedBoolConversion]>;
 def IntConversion : DiagGroup<"int-conversion">;
+def ClassConversion: DiagGroup<"class-conversion">;
 def DeprecatedEnumCompareConditional :
   DiagGroup<"deprecated-enum-compare-conditional">;
 def EnumCompareConditional : DiagGroup<"enum-compare-conditional",

diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index 84bcf66..ffe9513 100644 (file)
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -8589,11 +8589,14 @@ def err_conv_function_with_complex_decl : Error<
 def err_conv_function_redeclared : Error<
   "conversion function cannot be redeclared">;
 def warn_conv_to_self_not_used : Warning<
-  "conversion function converting %0 to itself will never be used">;
+  "conversion function converting %0 to itself will never be used">,
+  InGroup<ClassConversion>;
 def warn_conv_to_base_not_used : Warning<
-  "conversion function converting %0 to its base class %1 will never be used">;
+  "conversion function converting %0 to its base class %1 will never be used">,
+  InGroup<ClassConversion>;
 def warn_conv_to_void_not_used : Warning<
-  "conversion function converting %0 to %1 will never be used">;
+  "conversion function converting %0 to %1 will never be used">,
+  InGroup<ClassConversion>;
 
 def warn_not_compound_assign : Warning<
   "use of unary operator that may be intended as compound assignment (%0=)">;

diff --git a/clang/test/Misc/warning-flags.c b/clang/test/Misc/warning-flags.c
index aff90dd..841c748 100644 (file)
--- a/clang/test/Misc/warning-flags.c
+++ b/clang/test/Misc/warning-flags.c
@@ -18,7 +18,8 @@ This test serves two purposes:
 
 The list of warnings below should NEVER grow.  It should gradually shrink to 0.
 
-CHECK: Warnings without flags (72):
+CHECK: Warnings without flags (69):
+
 CHECK-NEXT:   ext_expected_semi_decl_list
 CHECK-NEXT:   ext_explicit_specialization_storage_class
 CHECK-NEXT:   ext_missing_declspec
@@ -41,9 +42,6 @@ CHECK-NEXT:   warn_case_empty_range
 CHECK-NEXT:   warn_char_constant_too_large
 CHECK-NEXT:   warn_collection_expr_type
 CHECK-NEXT:   warn_conflicting_variadic
-CHECK-NEXT:   warn_conv_to_base_not_used
-CHECK-NEXT:   warn_conv_to_self_not_used
-CHECK-NEXT:   warn_conv_to_void_not_used
 CHECK-NEXT:   warn_delete_array_type
 CHECK-NEXT:   warn_double_const_requires_fp64
 CHECK-NEXT:   warn_drv_assuming_mfloat_abi_is