Switch to <stdbool.h> in the VM.

We were using an enum that made the compiler unhappy on MacOS X.  This
switches us to using <stdbool.h> when it's available.

The size of a "bool" is either sizeof(_Bool) or sizeof(enum bool), and
the assembly sources dislike ambiguity, so this also changes
gDvm.debuggerActive to always be a single byte.  The ARM and x86 code
was already assuming that -- held over from when enums were
variable-width, and never fixed because we get the right answer on
little-endian platforms -- so it doesn't look like we need to change
anything in mterp.

1 files changed, 7 insertions, 3 deletions

diff --git a/vm/Common.h b/vm/Common.h
index 4b357e2e1..d0c021d50 100644
--- a/vm/Common.h
+++ b/vm/Common.h
@@ -97,11 +97,15 @@ typedef union JValue {
 } JValue;
 
 /*
- * Some systems might have this in <stdbool.h>.
+ * The <stdbool.h> definition uses _Bool, a type known to the compiler.
  */
-#ifndef __bool_true_false_are_defined
+#ifdef HAVE_STDBOOL_H
+# include <stdbool.h>   /* C99 */
+#else
+# ifndef __bool_true_false_are_defined
 typedef enum { false=0, true=!false } bool;
-#define __bool_true_false_are_defined 1
+# define __bool_true_false_are_defined 1
+# endif
 #endif
 
 #define NELEM(x) ((int) (sizeof(x) / sizeof((x)[0])))