1 files changed, 7 insertions, 4 deletions
diff --git a/gcc/cccp.c b/gcc/cccp.c
index e91d8cf..9a02333 100644
--- a/gcc/cccp.c
+++ b/gcc/cccp.c
@@ -10249,10 +10249,13 @@ initialize_char_syntax ()
    * refer to them.
    */
   for (i = 'a'; i <= 'z'; i++) {
-    is_idchar[TOUPPER(i)] = 1;
-    is_idchar[i] = 1;
-    is_idstart[TOUPPER(i)] = 1;
-    is_idstart[i] = 1;
+    /* SKIP EBCIDIC holes, char must be a valid low case char */
+    if (ISLOWER(i)) {
+      is_idchar[TOUPPER(i)] = 1;
+      is_idchar[i] = 1;
+      is_idstart[TOUPPER(i)] = 1;
+      is_idstart[i] = 1;
+    }
   }
   for (i = '0'; i <= '9'; i++)
     is_idchar[i] = 1;