@@ -534,6 +534,10 @@ Wenum-compare
C ObjC C++ ObjC++ Var(warn_enum_compare) Init(-1) Warning LangEnabledBy(C ObjC,Wall || Wc++-compat)
Warn about comparison of different enum types.
+Wenum-conversion
+C ObjC Var(warn_enum_conversion) Init(0) Warning LangEnabledBy(C ObjC,Wextra)
+Warn about implicit conversion of enum types.
+
Werror
C ObjC C++ ObjC++
; Documented in common.opt
@@ -6726,6 +6726,21 @@ convert_for_assignment (location_t location, location_t expr_loc, tree type,
}
}
+ if (warn_enum_conversion)
+ {
+ tree checktype = origtype != NULL_TREE ? origtype : rhstype;
+ if (checktype != error_mark_node
+ && TREE_CODE (checktype) == ENUMERAL_TYPE
+ && TREE_CODE (type) == ENUMERAL_TYPE
+ && TYPE_MAIN_VARIANT (checktype) != TYPE_MAIN_VARIANT (type))
+ {
+ gcc_rich_location loc (location);
+ warning_at (&loc, OPT_Wenum_conversion,
+ "implicit conversion from %qT to %qT",
+ checktype, type);
+ }
+ }
+
if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype))
{
warn_for_address_or_pointer_of_packed_member (type, orig_rhs);
@@ -306,7 +306,8 @@ Objective-C and Objective-C++ Dialects}.
-Wno-discarded-qualifiers -Wno-discarded-array-qualifiers @gol
-Wno-div-by-zero -Wdouble-promotion @gol
-Wduplicated-branches -Wduplicated-cond @gol
--Wempty-body -Wenum-compare -Wno-endif-labels -Wexpansion-to-defined @gol
+-Wempty-body -Wenum-compare -Wenum-conversion @gol
+-Wno-endif-labels -Wexpansion-to-defined @gol
-Werror -Werror=* -Wextra-semi -Wfatal-errors @gol
-Wfloat-equal -Wformat -Wformat=2 @gol
-Wno-format-contains-nul -Wno-format-extra-args @gol
@@ -4430,6 +4431,7 @@ Options} and @ref{Objective-C and Objective-C++ Dialect Options}.
-Wcomment @gol
-Wduplicate-decl-specifier @r{(C and Objective-C only)} @gol
-Wenum-compare @r{(in C/ObjC; this is on by default in C++)} @gol
+-Wenum-conversion @r{in C/ObjC;} @gol
-Wformat @gol
-Wint-in-bool-context @gol
-Wimplicit @r{(C and Objective-C only)} @gol
@@ -7002,6 +7004,12 @@ In C++ enumerated type mismatches in conditional expressions are also
diagnosed and the warning is enabled by default. In C this warning is
enabled by @option{-Wall}.
+@item -Wenum-conversion @r{(C, Objective-C only)}
+@opindex Wenum-conversion
+@opindex Wno-enum-conversion
+Warn when a value of enumerated type is implicitly converted to a
+different enumerated type. This warning is enabled by @option{-Wextra}.
+
@item -Wextra-semi @r{(C++, Objective-C++ only)}
@opindex Wextra-semi
@opindex Wno-extra-semi
new file mode 100644
@@ -0,0 +1,20 @@
+/* { dg-do compile } */
+/* { dg-options "-Wenum-conversion" } */
+
+enum X { x1, x2 };
+enum Y { y1, y2 };
+
+enum X obj = y1; /* { dg-warning "implicit conversion from .enum Y. to .enum X." } */
+enum Y obj2 = y1;
+
+enum X obj3;
+void foo()
+{
+ obj3 = y2; /* { dg-warning "implicit conversion from .enum Y. to .enum X." } */
+}
+
+void bar(enum X);
+void f(void)
+{
+ bar (y1); /* { dg-warning "implicit conversion from .enum Y. to .enum X." } */
+}