From b7e1eda932c74196d58e6b63644200b764b5453e Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Mon, 4 May 2020 12:10:04 +0900
Subject: Suppress warnings by gcc 10.1.0-RC-20200430

* Folding results should not be empty.

  If `OnigCodePointCount(to->n)` were 0, `for` loop using `fn`
  wouldn't execute and `ncs` elements are not initialized.

  ```
  enc/unicode.c:557:21: warning: 'ncs[0]' may be used uninitialized in this function [-Wmaybe-uninitialized]
    557 |  for (i = 0; i < ncs[0]; i++) {
        |                  ~~~^~~
  ```

* Cast to `enum yytokentype`

  Additional enums for scanner events by ripper are not included
  in `yytokentype`.

  ```
  ripper.y:7274:28: warning: implicit conversion from 'enum <anonymous>' to 'enum yytokentype' [-Wenum-conversion]
  ```
---
 enc/unicode.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'enc/unicode.c')

diff --git a/enc/unicode.c b/enc/unicode.c
index 6e8c3d8816..18fba02476 100644
--- a/enc/unicode.c
+++ b/enc/unicode.c
@@ -493,6 +493,10 @@ onigenc_unicode_get_case_fold_codes_by_str(OnigEncoding enc,
 #endif
 
   if ((to = onigenc_unicode_fold_lookup(code)) != 0) {
+    if (OnigCodePointCount(to->n) == 0) {
+      /* any codepoint should not be empty */
+      UNREACHABLE_RETURN(0);
+    }
     if (OnigCodePointCount(to->n) == 1) {
       OnigCodePoint orig_code = code;
 
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