From f4b5566d0976f55b1fda8cea943283901a3fdc72 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Thu, 9 Apr 2026 10:32:30 +0900
Subject: mkmf: grep all occurrences in cpp output

Apple clang aborts if cpp output is closed in middle, and leaves the
preprocessed source and reproduction shell script.
---
 lib/mkmf.rb | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 5f7a7d352a..39ba4030cc 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -931,11 +931,9 @@ SRC
     xpopen(cpp_command('', opt)) do |f|
       if Regexp === pat
         puts("    ruby -ne 'print if #{pat.inspect}'")
-        f.grep(pat) {|l|
+        !f.grep(pat) {|l|
           puts "#{f.lineno}: #{l}"
-          return true
-        }
-        false
+        }.empty?
       else
         puts("    egrep '#{pat}'")
         system("egrep", pat, in: f)
-- 
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