[PATCH] Fix abort in write_eligible_delay

[Jeff Law]

Various ports are currently failing to build, faulting in 
write_eligible_delay.

This can happen if the target has delay slots defined, but does not have 
annul-true or annul-false slots.  cris is a reasonable example.

This is most easily addressed by writing out a trivial dummy function if 
we don't have annul-true or annul-false slots.

I've verified this fixes the 47 newly failing targets in config-list.mk 
and survives the usual bootstrap & comparison test on x86_64-linux-gnu.

Installed on the trunk.

Jeff
commit 6119ad4e875ff0c856102c14b08d869c7d33b357
Author: law <law@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Thu Oct 22 19:18:05 2015 +0000

    [PATCH] Fix abort in write_eligible_delay
            * genattrtab.c (main): If we do not have any annul-true or 
annul-false
            slots, then write out a dummy eligible_for_annul_true or
            eligible_for_annul_false as needed.
    
    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@229184 
138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 08d26a9..04d8e16 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2015-10-22  Jeff Law  <l...@redhat.com>
+
+       * genattrtab.c (main): If we do not have any annul-true or annul-false
+       slots, then write out a dummy eligible_for_annul_true or
+       eligible_for_annul_false as needed.
+
 2015-10-22  Nick Clifton  <ni...@redhat.com>
 
        * config/msp430/msp430.opt: Add -msilicon-errata and
diff --git a/gcc/genattrtab.c b/gcc/genattrtab.c
index 8d1fa6c..32b837c 100644
--- a/gcc/genattrtab.c
+++ b/gcc/genattrtab.c
@@ -4411,6 +4411,26 @@ write_indent (FILE *outf, int indent)
     fprintf (outf, " ");
 }
 
+/* If the target does not have annul-true or annul-false delay slots, this
+   function will create a dummy eligible_for function on OUTF which always
+   returns false.  KIND will be annul_true or annul_false.  */
+
+static void
+write_dummy_eligible_delay (FILE *outf, const char *kind)
+{
+  /* Write function prelude.  */
+
+  fprintf (outf, "int\n");
+  fprintf (outf, "eligible_for_%s (rtx_insn *delay_insn ATTRIBUTE_UNUSED,\n"
+                "    int slot ATTRIBUTE_UNUSED,\n"
+                "    rtx_insn *candidate_insn ATTRIBUTE_UNUSED,\n"
+                "    int flags ATTRIBUTE_UNUSED)\n",
+          kind);
+  fprintf (outf, "{\n");
+  fprintf (outf, "  return 0;\n");
+  fprintf (outf, "}\n\n");
+}
+
 /* Write a subroutine that is given an insn that requires a delay slot, a
    delay slot ordinal, and a candidate insn.  It returns nonzero if the
    candidate can be placed in the specified delay slot of the insn.
@@ -5307,8 +5327,14 @@ main (int argc, char **argv)
      (The function to compute the number of delay slots will be written
      below.)  */
   write_eligible_delay (attr_file, "delay");
-  write_eligible_delay (attr_file, "annul_true");
-  write_eligible_delay (attr_file, "annul_false");
+  if (have_annul_true)
+    write_eligible_delay (attr_file, "annul_true");
+  else
+    write_dummy_eligible_delay (attr_file, "annul_true");
+  if (have_annul_false)
+    write_eligible_delay (attr_file, "annul_false");
+  else
+    write_dummy_eligible_delay (attr_file, "annul_false");
 
   /* Write out constant delay slot info.  */
   write_const_num_delay_slots (attr_file);