Warning and partial fix for gcc -freorder-blocks-and-partition related problem.

[deliverable/binutils-gdb.git] / gas / config / tc-ia64.c

diff --git a/gas/config/tc-ia64.c b/gas/config/tc-ia64.c
index c84b4ef49543563f14feef7bc9926e042cd3961b..cab32cd04737fae2c947838f7d98f7fd680641ae 100644 (file)
--- a/gas/config/tc-ia64.c
+++ b/gas/config/tc-ia64.c
@@ -2708,6 +2708,26 @@ slot_index (slot_addr, slot_frag, first_addr, first_frag, before_relax)
       /* Move to the beginning of the next frag.  */
       first_frag = first_frag->fr_next;
       first_addr = (unsigned long) &first_frag->fr_literal;
+
+      /* This can happen if there is section switching in the middle of a
+        function, causing the frag chain for the function to be broken.  */
+      if (first_frag == NULL)
+       {
+         /* We get six warnings for one problem, because of the loop in
+            fixup_unw_records, and because fixup_unw_records is called 3
+            times: once before creating the variant frag, once to estimate
+            its size, and once to relax it.  This is unreasonable, so we use
+            a static var to make sure we only emit the warning once.  */
+         static int warned = 0;
+
+         if (!warned)
+           {
+             as_warn ("Corrupted unwind info due to unsupported section switching");
+             warned = 1;
+           }
+
+         return index;
+       }
     }
 
   /* Add in the used part of the last frag.  */