diff --git a/gcc/genopinit.c b/gcc/genopinit.c
index 13ebc0a1ad6..b07b8404ffb 100644
--- a/gcc/genopinit.c
+++ b/gcc/genopinit.c
@@ -63,28 +63,31 @@ void fancy_abort ();
    used for comparisons.  In that case, %c and %C are the lower-case and
    upper-case forms of the comparison, respectively.  */
 
+/* The reason we use \% is to avoid sequences of the form %-capletter-%
+   which SCCS treats as magic.  This gets warnings which you should ignore.  */
+
 char *optabs[] =
-{ "extendtab[(int) %B][(int) %A][0] = CODE_FOR_%(extend%a%b2%)",
-  "extendtab[(int) %B][(int) %A][1] = CODE_FOR_%(zero_extend%a%b2%)",
-  "fixtab[(int) %A][(int) %B][0] = CODE_FOR_%(fix%F%a%I%b2%)",
-  "fixtab[(int) %A][(int) %B][1] = CODE_FOR_%(fixuns%F%a%b2%)",
-  "fixtrunctab[(int) %A][(int) %B][0] = CODE_FOR_%(fix_trunc%F%a%I%b2%)",
-  "fixtrunctab[(int) %A][(int) %B][1] = CODE_FOR_%(fixuns_trunc%F%a%I%b2%)",
-  "floattab[(int) %B][(int) %A][0] = CODE_FOR_%(float%I%a%F%b2%)",
-  "floattab[(int) %B][(int) %A][1] = CODE_FOR_%(floatuns%I%a%F%b%)",
+{ "extendtab[(int) %B][(int) %A][0] = CODE_FOR_%(extend%a\%b2%)",
+  "extendtab[(int) %B][(int) %A][1] = CODE_FOR_%(zero_extend%a\%b2%)",
+  "fixtab[(int) %A][(int) %B][0] = CODE_FOR_%(fix%F\%a%I\%b2%)",
+  "fixtab[(int) %A][(int) %B][1] = CODE_FOR_%(fixuns%F\%a%b2%)",
+  "fixtrunctab[(int) %A][(int) %B][0] = CODE_FOR_%(fix_trunc%F\%a%I\%b2%)",
+  "fixtrunctab[(int) %A][(int) %B][1] = CODE_FOR_%(fixuns_trunc%F\%a%I\%b2%)",
+  "floattab[(int) %B][(int) %A][0] = CODE_FOR_%(float%I\%a%F\%b2%)",
+  "floattab[(int) %B][(int) %A][1] = CODE_FOR_%(floatuns%I\%a%F\%b%)",
   "add_optab->handlers[(int) %A].insn_code = CODE_FOR_%(add%a3%)",
   "sub_optab->handlers[(int) %A].insn_code = CODE_FOR_%(sub%a3%)",
   "smul_optab->handlers[(int) %A].insn_code = CODE_FOR_%(mul%a3%)",
   "smul_widen_optab->handlers[(int) %B].insn_code = CODE_FOR_%(mul%a%b3%)%N",
   "umul_widen_optab->handlers[(int) %B].insn_code = CODE_FOR_%(umul%a%b3%)%N",
-  "sdiv_optab->handlers[(int) %A].insn_code = CODE_FOR_%(div%I%a3%)",
-  "udiv_optab->handlers[(int) %A].insn_code = CODE_FOR_%(udiv%I%a3%)",
+  "sdiv_optab->handlers[(int) %A].insn_code = CODE_FOR_%(div%I\%a3%)",
+  "udiv_optab->handlers[(int) %A].insn_code = CODE_FOR_%(udiv%I\%a3%)",
   "sdivmod_optab->handlers[(int) %A].insn_code = CODE_FOR_%(divmod%a4%)",
   "udivmod_optab->handlers[(int) %A].insn_code = CODE_FOR_%(udivmod%a4%)",
   "smod_optab->handlers[(int) %A].insn_code = CODE_FOR_%(mod%a3%)",
   "umod_optab->handlers[(int) %A].insn_code = CODE_FOR_%(umod%a3%)",
-  "flodiv_optab->handlers[(int) %A].insn_code = CODE_FOR_%(div%F%a3%)",
-  "ftrunc_optab->handlers[(int) %A].insn_code = CODE_FOR_%(ftrunc%F%a2%)",
+  "flodiv_optab->handlers[(int) %A].insn_code = CODE_FOR_%(div%F\%a3%)",
+  "ftrunc_optab->handlers[(int) %A].insn_code = CODE_FOR_%(ftrunc%F\%a2%)",
   "and_optab->handlers[(int) %A].insn_code = CODE_FOR_%(and%a3%)",
   "ior_optab->handlers[(int) %A].insn_code = CODE_FOR_%(ior%a3%)",
   "xor_optab->handlers[(int) %A].insn_code = CODE_FOR_%(xor%a3%)",
@@ -94,12 +97,12 @@ char *optabs[] =
   "lshr_optab->handlers[(int) %A].insn_code = CODE_FOR_%(lshr%a3%)",
   "rotl_optab->handlers[(int) %A].insn_code = CODE_FOR_%(rotl%a3%)",
   "rotr_optab->handlers[(int) %A].insn_code = CODE_FOR_%(rotr%a3%)",
-  "smin_optab->handlers[(int) %A].insn_code = CODE_FOR_%(smin%I%a3%)",
-  "smin_optab->handlers[(int) %A].insn_code = CODE_FOR_%(min%F%a3%)",
-  "smax_optab->handlers[(int) %A].insn_code = CODE_FOR_%(smax%I%a3%)",
-  "smax_optab->handlers[(int) %A].insn_code = CODE_FOR_%(max%F%a3%)",
-  "umin_optab->handlers[(int) %A].insn_code = CODE_FOR_%(umin%I%a3%)",
-  "umax_optab->handlers[(int) %A].insn_code = CODE_FOR_%(umax%I%a3%)",
+  "smin_optab->handlers[(int) %A].insn_code = CODE_FOR_%(smin%I\%a3%)",
+  "smin_optab->handlers[(int) %A].insn_code = CODE_FOR_%(min%F\%a3%)",
+  "smax_optab->handlers[(int) %A].insn_code = CODE_FOR_%(smax%I\%a3%)",
+  "smax_optab->handlers[(int) %A].insn_code = CODE_FOR_%(max%F\%a3%)",
+  "umin_optab->handlers[(int) %A].insn_code = CODE_FOR_%(umin%I\%a3%)",
+  "umax_optab->handlers[(int) %A].insn_code = CODE_FOR_%(umax%I\%a3%)",
   "neg_optab->handlers[(int) %A].insn_code = CODE_FOR_%(neg%a2%)",
   "abs_optab->handlers[(int) %A].insn_code = CODE_FOR_%(abs%a2%)",
   "sqrt_optab->handlers[(int) %A].insn_code = CODE_FOR_%(sqrt%a2%)",