[PATCH 3/4] perf tools: Check libunwind for availability of dwarf parsing feature

[Will Deacon]

On Tue, Sep 24, 2013 at 10:34:50AM +0100, Jiri Olsa wrote:
> On Tue, Sep 24, 2013 at 10:55:32AM +0200, Jean Pihet wrote:
> > Ping on the series. The two patches above (3/4 and 4/4) are generic
> > while the two others are impacting ARM only.
> > Is it possible to get an Ack for the generic ones?
> 
> I'm fine with those changes.. still I'm sort of worried about
> current DWARF unwind users (but not sure if there're any),
> who depends on packaged libunwind compiled without
> --enable-debug-frame option.

Since x86 is the only architecture using libunwind with perf at the moment,
and I'd expect it to use .eh_frame for unwinding, I'm also not sure there
are any existing users to worry about.

> I've seen your libunwind patch to make it default, but
> not sure if it was accepted.. if not, maybe we should
> detect this and build that code conditionaly.

It certainly defaults to "on" for ARM, but other architectures have to
enable it explicitly afaict.

Will