From 5ec1fc52c1640c75899972ad99734ff22a90694a Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Thu, 24 Aug 2023 19:10:33 +0900
Subject: Escape non-ascii characters in prelude C comments

Non-ASCII code are often warned by localized compilers.
---
 template/prelude.c.tmpl | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'template/prelude.c.tmpl')

diff --git a/template/prelude.c.tmpl b/template/prelude.c.tmpl
index aa8b0c1fef..74f6c08da7 100644
--- a/template/prelude.c.tmpl
+++ b/template/prelude.c.tmpl
@@ -43,7 +43,10 @@ class Prelude
     lineno = 0
     result = [@preludes.size, @vpath.strip(filename), lines, sub]
     @vpath.foreach(filename) do |line|
-      line.force_encoding("ASCII-8BIT") if line.respond_to?(:force_encoding)
+      if line.respond_to?(:force_encoding)
+        enc = line.encoding
+        line.force_encoding("ASCII-8BIT")
+      end
       line.rstrip!
       lineno += 1
       @preludes[filename] ||= result
@@ -71,6 +74,7 @@ class Prelude
           orig
         end
       end
+      comment.force_encoding(enc) if enc and comment
       lines << [line, comment]
     end
     result << (start_line || 1)
-- 
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