merges r20742 from trunk into ruby_1_9_1.

* vm.c (vm_backtrace): defaults to script name for C functions.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@20809 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/vm.c b/vm.c
index 6c06a21c09..f91f3586e2 100644
--- a/vm.c
+++ b/vm.c
@@ -704,7 +704,7 @@ vm_backtrace(rb_thread_t *th, int lev)
     }
 
     ary = vm_backtrace_each(th, RUBY_VM_NEXT_CONTROL_FRAME(cfp),
-			    top_of_cfp, "", 0, ary);
+			    top_of_cfp, RSTRING_PTR(th->vm->progname), 0, ary);
     return ary;
 }