14:03 <litb> hello folks

14:04 <litb> why does systemtap complain that it couldn't match a function name and proposes similar function names that actually match exactly?

14:04 <litb> this is what i gave: probe process("qtconfig-qt4").function("_ZN7QWidget14setWindowTitleERK7QString") { print($parm1) }

14:05 <litb> and it complains: semantic error: no match (similar functions: _ZN7QWidget14setWindowTitleERK7QString, _ZN7QWidget10setToolTipERK7QString, _ZN11QMessageBox14setWindowTitleERK7QString, _ZN7QWidget12setWhatsThisERK7QString, _ZN7QWidget13setWindowIconERK5QIcon)

14:05 <litb> (neither did it work using non-mangled notation)

14:08 <fche> litb, not sure, pls consider opening a bug report; is there a $parm1 by the way?

14:11 <litb> fche: yes

14:11 <litb> it's a QString const&

14:12 <litb> fche: perhaps it doesn't support reference parameter types, and tries to unmangle the name, failing at the reference?

14:12 <fche> don't think that'd show up at the dwarf level

14:13 <fche> is this a function defined within the qtconfig* binary, or is it in a shared library called from there?

14:13 <litb> fche: defined as external inline function in a .so file (clasś member)

14:14 <litb> i guess that means it's emitted in the binary?

14:14 <fche> tried probe process("/path/to/that/libqt.so").function("_Z*" ?

14:33 <litb> fche: actually it wasn't inline. I tried probe process("/usr/lib/libQtGui.so.4.8.7").function("*") { print(probefunc(), "\n") } | c++filt | grep 'QWidget::setWindow and it actually prints QWidget::setWindowTitle(QString const&)

14:33 <litb> fche: but when the function isn'T "*" but "QWidget::setWindowTitle", it gives the above match error

14:34 <fche> try a wildcard like *QWidget*setWindowTitle*

14:36 <litb> fche: fun, then it works. weird

14:37 <litb> it matches multiple symbols, including the one i wanted to match

14:51 <fche> try narrowing the wildcard down further; might be good enough