* c-decl.c (check_bitfield_type_and_width): Don't allow _Bool

	bit-fields wider than one bit.

testsuite:
	* gcc.dg/c99-bool-2.c, gcc.dg/c99-bool-3.c: New tests.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@128634 138bc75d-0d04-0410-961f-82ee72b054a4

3 files changed, 47 insertions, 14 deletions

diff --git a/gcc/testsuite/gcc.dg/c99-bool-1.c b/gcc/testsuite/gcc.dg/c99-bool-1.c
index 710219620b7..7ec99a76bfd 100644
--- a/gcc/testsuite/gcc.dg/c99-bool-1.c
+++ b/gcc/testsuite/gcc.dg/c99-bool-1.c
@@ -32,8 +32,6 @@ int c = __bool_true_false_are_defined;
 struct foo
 {
   _Bool a : 1;
-  _Bool b : 2;
-  _Bool c : 7;
 } sf;
 
 #define str(x) xstr(x)
@@ -242,21 +240,9 @@ main (void)
     sf.a = 1;
     if (sf.a != 1)
       abort ();
-    sf.b = 1;
-    if (sf.b != 1)
-      abort ();
-    sf.c = 1;
-    if (sf.c != 1)
-      abort ();
     sf.a = 0;
     if (sf.a != 0)
       abort ();
-    sf.b = 0;
-    if (sf.b != 0)
-      abort ();
-    sf.c = 0;
-    if (sf.c != 0)
-      abort ();
   }
   exit (0);
 }
diff --git a/gcc/testsuite/gcc.dg/c99-bool-2.c b/gcc/testsuite/gcc.dg/c99-bool-2.c
new file mode 100644
index 00000000000..5a577a428d6
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/c99-bool-2.c
@@ -0,0 +1,14 @@
+/* Test for _Bool bit-fields.  After TC2, the width of a _Bool
+   bit-field must not extend the width (number of sign and value bits)
+   of _Bool, which is implementation-defined but is 1 unless the
+   implementation defines representations for values greater than 1 in
+   type _Bool and allows for _Bool objects to have such types, which
+   GCC does not.  */
+/* Origin: Joseph Myers <joseph@codesourcery.com> */
+/* { dg-do compile } */
+/* { dg-options "-std=iso9899:1999 -pedantic-errors" } */
+
+struct foo
+{
+  _Bool b : 2; /* { dg-error "width" } */
+};
diff --git a/gcc/testsuite/gcc.dg/c99-bool-3.c b/gcc/testsuite/gcc.dg/c99-bool-3.c
new file mode 100644
index 00000000000..f93547ac016
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/c99-bool-3.c
@@ -0,0 +1,33 @@
+/* Test for _Bool bit-fields.  They have the semantics of _Bool, at
+   least for now (DR#335 Spring 2007 discussion).  */
+/* Origin: Joseph Myers <joseph@codesourcery.com> */
+/* { dg-do run } */
+/* { dg-options "-std=iso9899:1999 -pedantic-errors" } */
+struct foo
+{
+  _Bool a : 1;
+} sf;
+
+extern void abort (void);
+extern void exit (int);
+
+int
+main (void)
+{
+  int i;
+  for (i = 0; i < sizeof (struct foo); i++)
+    *((unsigned char *)&sf + i) = (unsigned char) -1;
+  sf.a = 2;
+  if (sf.a != 1)
+    abort ();
+  sf.a = 0;
+  if (sf.a != 0)
+    abort ();
+  sf.a = 0.2;
+  if (sf.a != 1)
+    abort ();
+  sf.a = &sf;
+  if (sf.a != 1)
+    abort ();
+  exit (0);
+}