obsolete xc16x

The xc16x md_apply_fix code is just so broken that in my opinion the
target should never have been accepted, and from a quick look at
commit logs for the target it appears that no one has ever contributed
fixes for anything.  This target has just been a 14 year burden on
global binutils and cgen maintainers.  That's not how free software is
supposed to work.

bfd/
	* config.bfd: Obsolete xc16x.
gas/
	* config/tc-xc16x.c (md_apply_fix): Add FIXME.

bfd/ChangeLog

@@ -1,3 +1,7 @@
+2020-07-01  Alan Modra  <amodra@gmail.com>
+
+	* config.bfd: Obsolete xc16x.
+
 2020-06-30  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* archures.c (bfd_mach_i386_nacl): Removed.

bfd/config.bfd

@@ -54,6 +54,7 @@ case $targ in
     exit 1
     ;;
  powerpcle-*-pe | powerpcle-*-winnt* | powerpcle-*-cygwin* | \
+ xc16x-*-* | \
  null)
     if test "x$enable_obsolete" != xyes; then
       echo "*** Configuration $targ is obsolete." >&2

gas/ChangeLog

@@ -1,3 +1,7 @@
+2020-07-01  Alan Modra  <amodra@gmail.com>
+
+	* config/tc-xc16x.c (md_apply_fix): Add FIXME.
+
 2020-07-01  Alan Modra  <amodra@gmail.com>
 
 	* testsuite/gas/all/eqv-dot.d: xfail targets that set linkrelax

gas/config/tc-xc16x.c

@@ -323,6 +323,8 @@ tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixp)
 void
 md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED)
 {
+  /* FIXME: This absolute nonsense apparently is to make relative
+     jumps "work".  Of course, it breaks any other type of fixup.  */
   if (!strstr (seg->name,".debug"))
     {
       if (*valP < 128)