[ruby-dev:26195] test_event(TestSetTraceFunc) failed on ruby-1.8 built with gcc-4.0

ruby 1.8 を gcc 4.0 で作ると

  1) Failure:
test_event(TestSetTraceFunc) [./test/ruby/test_settracefunc.rb:133]:
<["return", 7, :bar, TestSetTraceFunc]> expected but was
<["return", 6, :bar, TestSetTraceFunc]>.

というようにテストが失敗します。

調べてみると、とりあえず次のように volatile を入れると直ります。

Index: eval.c
===================================================================
RCS file: /src/ruby/eval.c,v
retrieving revision 1.616.2.97
diff -u -r1.616.2.97 eval.c
--- eval.c	18 May 2005 14:39:22 -0000	1.616.2.97
+++ eval.c	21 May 2005 10:40:41 -0000
@@ -5540,7 +5540,7 @@
     ID    oid;
     int argc;			/* OK */
     VALUE *argv;		/* OK */
-    NODE *body;			/* OK */
+    volatile NODE *body;			/* OK */
     int nosuper;
 {
     NODE *b2;		/* OK */

あと、/* OK */ というコメントはどうすべきかよくわかりません。

% ./miniruby -v
ruby 1.8.3 (2005-05-19) [i686-linux]
% gcc --version
gcc (GCC) 4.0.1 20050521 (prerelease)
Copyright (C) 2005 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-- 
[田中 哲][たなか あきら][Tanaka Akira]