From: Yusuke ENDOH <mame@...>
Date: 2010-01-25T22:54:46+09:00
Subject: [ruby-dev:40147] circular require warning is emitted to both stdout and stderr

遠藤です。

$ ./ruby -w foo.rb
/home/mame/work/ruby/foo.rb:1: warning: loading in progress, circular
require considered harmful - /home/mame/work/ruby/bar.rb
        from foo.rb:1:in `<main>'
        from foo.rb:1:in `require'
        from /home/mame/work/ruby/bar.rb:1:in `<top (required)>'
        from /home/mame/work/ruby/bar.rb:1:in `require'
        from /home/mame/work/ruby/foo.rb:1:in `<top (required)>'
        from /home/mame/work/ruby/foo.rb:1:in `require'

上記の "circular require considered harmful" の例外ですが、一行目は
stderr に、二行目以降は stdout に出ているようです。

$ ./ruby -w foo.rb > /dev/null
/home/mame/work/ruby/foo.rb:1: warning: loading in progress, circular
require considered harmful - /home/mame/work/ruby/bar.rb

$ ./ruby -w foo.rb 2> /dev/null
        from foo.rb:1:in `<main>'
        from foo.rb:1:in `require'
        from /home/mame/work/ruby/bar.rb:1:in `<top (required)>'
        from /home/mame/work/ruby/bar.rb:1:in `require'
        from /home/mame/work/ruby/foo.rb:1:in `<top (required)>'
        from /home/mame/work/ruby/foo.rb:1:in `require'

無駄にややこしいと思うので、反対がなければ以下のパッチをあてようと
思います。


diff --git a/vm_eval.c b/vm_eval.c
index 762453e..ada783d 100644
--- a/vm_eval.c
+++ b/vm_eval.c
@@ -1577,7 +1577,7 @@ print_backtrace(void *arg, VALUE file, int line,
VALUE method)
 void
 rb_backtrace(void)
 {
-    vm_backtrace_each(GET_THREAD(), -1, print_backtrace, stdout);
+    vm_backtrace_each(GET_THREAD(), -1, print_backtrace, stderr);
 }

 VALUE

-- 
Yusuke ENDOH <mame@tsg.ne.jp>