c: Implement new -Wenum-int-mismatch warning [PR105131]

In C, an enumerated type is compatible with char, a signed integer type,
or an unsigned integer type (6.7.2.2/5).  Therefore this code compiles:

  enum E { l = -1, z = 0, g = 1 };
  int foo(void);
  enum E foo(void) { return z; }

if the underlying type of 'enum E' is 'int' (if not, we emit an error).
This is different for typedefs, where C11 permits typedefs to be
redeclared to the same type, but not to compatible types.  In C++, the
code above is invalid.

It seems desirable to emit a warning in the C case, because it is
probably a mistake and definitely a portability error, given that the
choice of the underlying type is implementation-defined.

To that end, this patch implements a new -Wenum-int-mismatch warning.
Conveniently, we already have comptypes_check_enum_int to detect such
mismatches.  This warning is enabled by either -Wall or -Wc++-compat.

	PR c/105131

gcc/c-family/ChangeLog:

	* c.opt (Wenum-int-mismatch): New.

gcc/c/ChangeLog:

	* c-decl.cc (diagnose_mismatched_decls): Warn about enum/integer type
	mismatches.
	* c-tree.h (comptypes_check_enum_int): Declare.
	* c-typeck.cc (comptypes): No longer static.

gcc/ChangeLog:

	* doc/invoke.texi: Document -Wenum-int-mismatch.

gcc/testsuite/ChangeLog:

	* gcc.dg/Wenum-int-mismatch-1.c: New test.
	* gcc.dg/Wenum-int-mismatch-2.c: New test.
	* gcc.dg/Wenum-int-mismatch-3.c: New test.
	* gcc.dg/Wenum-int-mismatch-4.c: New test.
	* gcc.dg/Wenum-int-mismatch-5.c: New test.

diff --git a/gcc/c-family/c.opt b/gcc/c-family/c.opt
index 035b1de..41a20bc 100644 (file)
--- a/gcc/c-family/c.opt
+++ b/gcc/c-family/c.opt
@@ -638,6 +638,10 @@ Wenum-conversion
 C ObjC C++ ObjC++ Var(warn_enum_conversion) Init(0) Warning LangEnabledBy(C ObjC,Wextra)
 Warn about implicit conversion of enum types.
 
+Wenum-int-mismatch
+C ObjC Var(warn_enum_int_mismatch) Warning LangEnabledBy(C ObjC,Wall || Wc++-compat)
+Warn about enum/integer type mismatches.
+
 Werror
 C ObjC C++ ObjC++
 ; Documented in common.opt

diff --git a/gcc/c/c-decl.cc b/gcc/c/c-decl.cc
index 8365554..5266a61 100644 (file)
--- a/gcc/c/c-decl.cc
+++ b/gcc/c/c-decl.cc
@@ -1993,9 +1993,12 @@ diagnose_mismatched_decls (tree newdecl, tree olddecl,
 
   bool pedwarned = false;
   bool warned = false;
+  bool enum_and_int_p = false;
   auto_diagnostic_group d;
 
-  if (!comptypes (oldtype, newtype))
+  int comptypes_result = comptypes_check_enum_int (oldtype, newtype,
+                                                  &enum_and_int_p);
+  if (!comptypes_result)
     {
       if (TREE_CODE (olddecl) == FUNCTION_DECL
          && fndecl_built_in_p (olddecl, BUILT_IN_NORMAL)
@@ -2137,6 +2140,13 @@ diagnose_mismatched_decls (tree newdecl, tree olddecl,
          return false;
        }
     }
+  /* Warn about enum/integer type mismatches.  They are compatible types
+     (C2X 6.7.2.2/5), but may pose portability problems.  */
+  else if (enum_and_int_p && TREE_CODE (newdecl) != TYPE_DECL)
+    warned = warning_at (DECL_SOURCE_LOCATION (newdecl),
+                        OPT_Wenum_int_mismatch,
+                        "conflicting types for %q+D due to enum/integer "
+                        "mismatch; have %qT", newdecl, newtype);
 
   /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
      but silently ignore the redeclaration if either is in a system
@@ -2146,7 +2156,6 @@ diagnose_mismatched_decls (tree newdecl, tree olddecl,
   if (TREE_CODE (newdecl) == TYPE_DECL)
     {
       bool types_different = false;
-      int comptypes_result;
 
       comptypes_result
        = comptypes_check_different_types (oldtype, newtype, &types_different);

diff --git a/gcc/c/c-tree.h b/gcc/c/c-tree.h
index c70f0ba..2bcb966 100644 (file)
--- a/gcc/c/c-tree.h
+++ b/gcc/c/c-tree.h
@@ -685,6 +685,7 @@ extern tree require_complete_type (location_t, tree);
 extern bool same_translation_unit_p (const_tree, const_tree);
 extern int comptypes (tree, tree);
 extern int comptypes_check_different_types (tree, tree, bool *);
+extern int comptypes_check_enum_int (tree, tree, bool *);
 extern bool c_vla_type_p (const_tree);
 extern bool c_mark_addressable (tree, bool = false);
 extern void c_incomplete_type_error (location_t, const_tree, const_tree);

diff --git a/gcc/c/c-typeck.cc b/gcc/c/c-typeck.cc
index bcfe08b..4f3611f 100644 (file)
--- a/gcc/c/c-typeck.cc
+++ b/gcc/c/c-typeck.cc
@@ -1055,7 +1055,7 @@ comptypes (tree type1, tree type2)
 /* Like comptypes, but if it returns non-zero because enum and int are
    compatible, it sets *ENUM_AND_INT_P to true.  */
 
-static int
+int
 comptypes_check_enum_int (tree type1, tree type2, bool *enum_and_int_p)
 {
   const struct tagged_tu_seen_cache * tagged_tu_seen_base1 = tagged_tu_seen_base;

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index e8e6d4e..98a543a 100644 (file)
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -349,6 +349,7 @@ Objective-C and Objective-C++ Dialects}.
 -Wno-div-by-zero  -Wdouble-promotion @gol
 -Wduplicated-branches  -Wduplicated-cond @gol
 -Wempty-body  -Wno-endif-labels  -Wenum-compare  -Wenum-conversion @gol
+-Wenum-int-mismatch @gol
 -Werror  -Werror=*  -Wexpansion-to-defined  -Wfatal-errors @gol
 -Wfloat-conversion  -Wfloat-equal  -Wformat  -Wformat=2 @gol
 -Wno-format-contains-nul  -Wno-format-extra-args  @gol
@@ -5759,6 +5760,7 @@ Options} and @ref{Objective-C and Objective-C++ Dialect Options}.
 -Wdangling-pointer=2  @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-int-mismatch @r{(C and Objective-C only)} @gol
 -Wformat   @gol
 -Wformat-overflow  @gol
 -Wformat-truncation  @gol
@@ -8735,6 +8737,25 @@ Warn when a value of enumerated type is implicitly converted to a
 different enumerated type.  This warning is enabled by @option{-Wextra}
 in C@.
 
+@item -Wenum-int-mismatch @r{(C and Objective-C only)}
+@opindex Wenum-int-mismatch
+@opindex Wno-enum-int-mismatch
+Warn about mismatches between an enumerated type and an integer type in
+declarations.  For example:
+
+@smallexample
+enum E @{ l = -1, z = 0, g = 1 @};
+int foo(void);
+enum E foo(void);
+@end smallexample
+
+In C, an enumerated type is compatible with @code{char}, a signed
+integer type, or an unsigned integer type.  However, since the choice
+of the underlying type of an enumerated type is implementation-defined,
+such mismatches may cause portability issues.  In C++, such mismatches
+are an error.  In C, this warning is enabled by @option{-Wall} and
+@option{-Wc++-compat}.
+
 @item -Wjump-misses-init @r{(C, Objective-C only)}
 @opindex Wjump-misses-init
 @opindex Wno-jump-misses-init

diff --git a/gcc/testsuite/gcc.dg/Wenum-int-mismatch-1.c b/gcc/testsuite/gcc.dg/Wenum-int-mismatch-1.c
new file mode 100644 (file)
index 0000000..6298018
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/Wenum-int-mismatch-1.c
@@ -0,0 +1,43 @@
+/* PR c/105131 */
+/* { dg-do compile } */
+/* { dg-options "-Wall -fno-short-enums" } */
+
+enum E { E1 = -1, E2 = 0, E3 = 1 };
+
+int foo(void); /* { dg-message "previous declaration" } */
+enum E foo(void) { return E2; } /* { dg-warning "conflicting types" } */
+
+void bar(int); /* { dg-message "previous declaration" } */
+void bar(enum E); /* { dg-warning "conflicting types" } */
+
+extern int arr[10]; /* { dg-message "previous declaration" } */
+extern enum E arr[10]; /* { dg-warning "conflicting types" } */
+
+extern int i; /* { dg-message "previous declaration" } */
+extern enum E i; /* { dg-warning "conflicting types" } */
+
+extern int *p; /* { dg-message "previous declaration" } */
+extern enum E *p; /* { dg-warning "conflicting types" } */
+
+enum E foo2(void) { return E2; } /* { dg-message "previous definition" } */
+int foo2(void); /* { dg-warning "conflicting types" } */
+
+void bar2(enum E); /* { dg-message "previous declaration" } */
+void bar2(int); /* { dg-warning "conflicting types" } */
+
+extern enum E arr2[10]; /* { dg-message "previous declaration" } */
+extern int arr2[10]; /* { dg-warning "conflicting types" } */
+
+extern enum E i2; /* { dg-message "previous declaration" } */
+extern int i2; /* { dg-warning "conflicting types" } */
+
+extern enum E *p2; /* { dg-message "previous declaration" } */
+extern int *p2; /* { dg-warning "conflicting types" } */
+
+enum F { F1 = -1, F2, F3 } __attribute__ ((__packed__));
+
+enum F fn1(void); /* { dg-message "previous declaration" } */
+signed char fn1(void); /* { dg-warning "conflicting types" } */
+
+signed char fn2(void); /* { dg-message "previous declaration" } */
+enum F fn2(void); /* { dg-warning "conflicting types" } */

diff --git a/gcc/testsuite/gcc.dg/Wenum-int-mismatch-2.c b/gcc/testsuite/gcc.dg/Wenum-int-mismatch-2.c
new file mode 100644 (file)
index 0000000..e5f7500
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/Wenum-int-mismatch-2.c
@@ -0,0 +1,43 @@
+/* PR c/105131 */
+/* { dg-do compile } */
+/* { dg-options "-Wall -fno-short-enums" } */
+
+enum E { E1 = 0, E2, E3 };
+
+unsigned int foo(void); /* { dg-message "previous declaration" } */
+enum E foo(void) { return E2; } /* { dg-warning "conflicting types" } */
+
+void bar(unsigned int); /* { dg-message "previous declaration" } */
+void bar(enum E); /* { dg-warning "conflicting types" } */
+
+extern enum E arr[10]; /* { dg-message "previous declaration" } */
+extern unsigned int arr[10]; /* { dg-warning "conflicting types" } */
+
+extern unsigned int i; /* { dg-message "previous declaration" } */
+extern enum E i; /* { dg-warning "conflicting types" } */
+
+extern unsigned int *p; /* { dg-message "previous declaration" } */
+extern enum E *p; /* { dg-warning "conflicting types" } */
+
+enum E foo2(void) { return E2; } /* { dg-message "previous definition" } */
+unsigned int foo2(void); /* { dg-warning "conflicting types" } */
+
+void bar2(enum E); /* { dg-message "previous declaration" } */
+void bar2(unsigned int); /* { dg-warning "conflicting types" } */
+
+extern unsigned int arr2[10]; /* { dg-message "previous declaration" } */
+extern enum E arr2[10]; /* { dg-warning "conflicting types" } */
+
+extern enum E i2; /* { dg-message "previous declaration" } */
+extern unsigned int i2; /* { dg-warning "conflicting types" } */
+
+extern enum E *p2; /* { dg-message "previous declaration" } */
+extern unsigned int *p2; /* { dg-warning "conflicting types" } */
+
+enum F { F1 = 1u, F2, F3 } __attribute__ ((__packed__));
+
+enum F fn1(void); /* { dg-message "previous declaration" } */
+unsigned char fn1(void); /* { dg-warning "conflicting types" } */
+
+unsigned char fn2(void); /* { dg-message "previous declaration" } */
+enum F fn2(void); /* { dg-warning "conflicting types" } */

diff --git a/gcc/testsuite/gcc.dg/Wenum-int-mismatch-3.c b/gcc/testsuite/gcc.dg/Wenum-int-mismatch-3.c
new file mode 100644 (file)
index 0000000..4ddbeb1
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/Wenum-int-mismatch-3.c
@@ -0,0 +1,43 @@
+/* PR c/105131 */
+/* { dg-do compile } */
+/* { dg-options "-Wc++-compat -fno-short-enums" } */
+
+enum E { E1 = -1, E2 = 0, E3 = 1 };
+
+int foo(void); /* { dg-message "previous declaration" } */
+enum E foo(void) { return E2; } /* { dg-warning "conflicting types" } */
+
+void bar(int); /* { dg-message "previous declaration" } */
+void bar(enum E); /* { dg-warning "conflicting types" } */
+
+extern int arr[10]; /* { dg-message "previous declaration" } */
+extern enum E arr[10]; /* { dg-warning "conflicting types" } */
+
+extern int i; /* { dg-message "previous declaration" } */
+extern enum E i; /* { dg-warning "conflicting types" } */
+
+extern int *p; /* { dg-message "previous declaration" } */
+extern enum E *p; /* { dg-warning "conflicting types" } */
+
+enum E foo2(void) { return E2; } /* { dg-message "previous definition" } */
+int foo2(void); /* { dg-warning "conflicting types" } */
+
+void bar2(enum E); /* { dg-message "previous declaration" } */
+void bar2(int); /* { dg-warning "conflicting types" } */
+
+extern enum E arr2[10]; /* { dg-message "previous declaration" } */
+extern int arr2[10]; /* { dg-warning "conflicting types" } */
+
+extern enum E i2; /* { dg-message "previous declaration" } */
+extern int i2; /* { dg-warning "conflicting types" } */
+
+extern enum E *p2; /* { dg-message "previous declaration" } */
+extern int *p2; /* { dg-warning "conflicting types" } */
+
+enum F { F1 = -1, F2, F3 } __attribute__ ((__packed__));
+
+enum F fn1(void); /* { dg-message "previous declaration" } */
+signed char fn1(void); /* { dg-warning "conflicting types" } */
+
+signed char fn2(void); /* { dg-message "previous declaration" } */
+enum F fn2(void); /* { dg-warning "conflicting types" } */

diff --git a/gcc/testsuite/gcc.dg/Wenum-int-mismatch-4.c b/gcc/testsuite/gcc.dg/Wenum-int-mismatch-4.c
new file mode 100644 (file)
index 0000000..fcaca28
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/Wenum-int-mismatch-4.c
@@ -0,0 +1,5 @@
+/* PR c/105131 */
+/* { dg-do compile } */
+/* { dg-options "-fno-short-enums" } */
+
+#include "Wenum-int-mismatch-1.c"

diff --git a/gcc/testsuite/gcc.dg/Wenum-int-mismatch-5.c b/gcc/testsuite/gcc.dg/Wenum-int-mismatch-5.c
new file mode 100644 (file)
index 0000000..db24fd3
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/Wenum-int-mismatch-5.c
@@ -0,0 +1,5 @@
+/* PR c/105131 */
+/* { dg-do compile } */
+/* { dg-options "-fno-short-enums" } */
+
+#include "Wenum-int-mismatch-2.c"