* as.h (ENABLE_CHECKING): Default define to 0.

(know): Assert if ENABLE_CHECKING.
	(struct relax_type): Remove superfluous declaration.
	* configure.in (--enable-checking): New.
	* configure: Regenerate.
	* config.in: Regenerate.
	* config/tc-ppc.c (ppc_setup_opcodes): Do checks when ENABLE_CHECKING.
	Check for duplicate powerpc_operands entries.

gas/ChangeLog

@@ -1,3 +1,14 @@
+2007-04-21  Alan Modra  <amodra@bigpond.net.au>
+
+	* as.h (ENABLE_CHECKING): Default define to 0.
+	(know): Assert if ENABLE_CHECKING.
+	(struct relax_type): Remove superfluous declaration.
+	* configure.in (--enable-checking): New.
+	* configure: Regenerate.
+	* config.in: Regenerate.
+	* config/tc-ppc.c (ppc_setup_opcodes): Do checks when ENABLE_CHECKING.
+	Check for duplicate powerpc_operands entries.
+
 2007-04-20  Nathan Sidwell  <nathan@codesourcery.com>
 
 	* config/tc-m68k.c (mcf5253_ctrl): New.

gas/as.h

@@ -258,7 +258,11 @@ typedef addressT valueT;
 #endif
 /* COMMON now defined */
 
-#ifdef DEBUG
+#ifndef ENABLE_CHECKING
+#define ENABLE_CHECKING 0
+#endif
+
+#if ENABLE_CHECKING || defined (DEBUG)
 #ifndef know
 #define know(p) assert(p)	/* Verify our assumptions!  */
 #endif /* not yet defined */
@@ -566,7 +570,6 @@ segT   subseg_get (const char *, int);
 struct expressionS;
 struct fix;
 typedef struct symbol symbolS;
-struct relax_type;
 typedef struct frag fragS;
 
 /* literal.c */

gas/config.in

@@ -29,6 +29,9 @@
 /* Supported emulations. */
 #undef EMULATIONS
 
+/* Define if you want run-time sanity checks. */
+#undef ENABLE_CHECKING
+
 /* Define to 1 if translation of program messages to the user's native
    language is requested. */
 #undef ENABLE_NLS

gas/config/tc-ppc.c

@@ -1248,7 +1248,6 @@ ppc_setup_opcodes (void)
   const struct powerpc_opcode *op_end;
   const struct powerpc_macro *macro;
   const struct powerpc_macro *macro_end;
-  unsigned int i;
   bfd_boolean bad_insn = FALSE;
 
   if (ppc_hash != NULL)
@@ -1259,12 +1258,17 @@ ppc_setup_opcodes (void)
   /* Insert the opcodes into a hash table.  */
   ppc_hash = hash_new ();
 
+  if (ENABLE_CHECKING)
+    {
+      unsigned int i;
+
       /* Check operand masks.  Code here and in the disassembler assumes
 	 all the 1's in the mask are contiguous.  */
       for (i = 0; i < num_powerpc_operands; ++i)
 	{
 	  unsigned long mask = powerpc_operands[i].bitm;
 	  unsigned long right_bit;
+	  unsigned int j;
 
 	  right_bit = mask & -mask;
 	  mask += right_bit;
@@ -1274,10 +1278,21 @@ ppc_setup_opcodes (void)
 	      as_bad (_("powerpc_operands[%d].bitm invalid"), i);
 	      bad_insn = TRUE;
 	    }
+	  for (j = i + 1; j < num_powerpc_operands; ++j)
+	    if (memcmp (&powerpc_operands[i], &powerpc_operands[j],
+			sizeof (powerpc_operands[0])) == 0)
+	      {
+		as_bad (_("powerpc_operands[%d] duplicates powerpc_operands[%d]"),
+			j, i);
+		bad_insn = TRUE;
+	      }
+	}
     }
 
   op_end = powerpc_opcodes + powerpc_num_opcodes;
   for (op = powerpc_opcodes; op < op_end; op++)
+    {
+      if (ENABLE_CHECKING)
 	{
 	  const unsigned char *o;
 	  unsigned long omask = op->mask;
@@ -1313,6 +1328,7 @@ ppc_setup_opcodes (void)
 		    omask |= mask;
 		  }
 	      }
+	}
 
       if ((op->flags & ppc_cpu & ~(PPC_OPCODE_32 | PPC_OPCODE_64)) != 0
 	  && ((op->flags & (PPC_OPCODE_32 | PPC_OPCODE_64)) == 0

gas/configure

@@ -858,6 +858,7 @@ Optional Features:
   --disable-libtool-lock  avoid locking (might break parallel builds)
   --enable-targets        alternative target configurations besides the primary
   --enable-commonbfdlib   build shared BFD/opcodes/libiberty library
+  --enable-checking       enable run-time checks
   --enable-werror         treat compile warnings as errors
   --enable-build-warnings enable build-time compiler warnings
   --disable-nls           do not use Native Language Support
@@ -3866,7 +3867,7 @@ test x"$pic_mode" = xno && libtool_flags="$libtool_flags --prefer-non-pic"
 case $host in
 *-*-irix6*)
   # Find out which ABI we are using.
-  echo '#line 3869 "configure"' > conftest.$ac_ext
+  echo '#line 3870 "configure"' > conftest.$ac_ext
   if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   (eval $ac_compile) 2>&5
   ac_status=$?
@@ -4164,7 +4165,8 @@ echo "$as_me: error: enable-targets option must specify target names or 'all'" >
   no)	    enable_targets= ;;
   *)	    enable_targets=$enableval ;;
 esac
-fi; # Check whether --enable-commonbfdlib or --disable-commonbfdlib was given.
+fi;
+# Check whether --enable-commonbfdlib or --disable-commonbfdlib was given.
 if test "${enable_commonbfdlib+set}" = set; then
   enableval="$enable_commonbfdlib"
   case "${enableval}" in
@@ -4175,6 +4177,25 @@ echo "$as_me: error: bad value ${enableval} for BFD commonbfdlib option" >&2;}
    { (exit 1); exit 1; }; } ;;
 esac
 fi;
+ac_checking=yes
+if grep '^RELEASE=y' ${srcdir}/../bfd/Makefile.am >/dev/null 2>/dev/null ; then
+  ac_checking=
+fi
+# Check whether --enable-checking or --disable-checking was given.
+if test "${enable_checking+set}" = set; then
+  enableval="$enable_checking"
+  case "${enableval}" in
+  no|none)  ac_checking= ;;
+  *)	    ac_checking=yes ;;
+esac
+fi; if test x$ac_checking != x ; then
+
+cat >>confdefs.h <<\_ACEOF
+#define ENABLE_CHECKING 1
+_ACEOF
+
+fi
+
 using_cgen=no
 
 

gas/configure.in

@@ -30,6 +30,7 @@ AC_ARG_ENABLE(targets,
   no)	    enable_targets= ;;
   *)	    enable_targets=$enableval ;;
 esac])dnl
+
 AC_ARG_ENABLE(commonbfdlib,
 [  --enable-commonbfdlib   build shared BFD/opcodes/libiberty library],
 [case "${enableval}" in
@@ -38,6 +39,20 @@ AC_ARG_ENABLE(commonbfdlib,
   *)   AC_MSG_ERROR([bad value ${enableval} for BFD commonbfdlib option]) ;;
 esac])dnl
 
+ac_checking=yes
+if grep '^RELEASE=y' ${srcdir}/../bfd/Makefile.am >/dev/null 2>/dev/null ; then
+  ac_checking=
+fi
+AC_ARG_ENABLE(checking,
+[  --enable-checking       enable run-time checks],
+[case "${enableval}" in
+  no|none)  ac_checking= ;;
+  *)	    ac_checking=yes ;;
+esac])dnl
+if test x$ac_checking != x ; then
+  AC_DEFINE(ENABLE_CHECKING, 1, [Define if you want run-time sanity checks.])
+fi
+
 using_cgen=no
 
 AM_BINUTILS_WARNINGS