Re: [RFC PATCH] libtraceevent: Increase libtraceevent logging when verbose

[Steven Rostedt <rostedt@xxxxxxxxxxx>]

On Thu, 10 Jun 2021 11:50:00 -0700
Ian Rogers <irogers@xxxxxxxxxx> wrote:

> #if LIBTRACE_EVENT_API > 123
> ...
> #endif
> 
> so that we can make sure perf is taking advantage of the improvements
> in the libtraceevent API?

Yes, and trace-cmd did that.

In the Makefile:

LIBTRACEEVENT_MIN_VERSION = 1.2.3
TEST_LIBTRACEEVENT = $(shell sh -c "$(PKG_CONFIG) --atleast-version $(LIBTRACEEVENT_MIN_VERSION) libtraceevent > /dev/null 2>&1 && echo y")

ifeq ("$(TEST_LIBTRACEEVENT)", "y")
CFLAGS += -DHAVE_TRACEVEVENT_API
endif

Then you can use in perf

#ifdef HAVE_TRACEEVENT_API
...
#endif

That's just one example of what you could do.

-- Steve