----- Original Message ----- > From: "Jérémie Galarneau" <[email protected]> > To: "Gerlando Falauto" <[email protected]> > Cc: [email protected] > Sent: Monday, May 12, 2014 1:43:06 PM > Subject: Re: [lttng-dev] linking C++ modules against lttng-ust libraries > > On Mon, May 12, 2014 at 10:53 AM, Gerlando Falauto > <[email protected]> wrote: > > Hi, > > > > I am trying to link a C++ application against lttng-ust, with a simple test > > case, and I get the following error message upon linking: > > > > main.cpp:109: undefined reference to `_lttng_ust_tracef(char const*, ...)' > > > > where main.cpp reads: > > ... > > 13: #include <lttng/tracef.h> > > ... > > 109: tracef("my message, this integer %d", 1234); > > ... > > > > The following seems to fix my problem: > > > > diff --git a/include/lttng/tracef.h b/include/lttng/tracef.h > > index 16a984b..98338d8 100644 > > --- a/include/lttng/tracef.h > > +++ b/include/lttng/tracef.h > > @@ -23,6 +23,10 @@ > > * SOFTWARE. > > */ > > > > +#ifdef __cplusplus > > +extern "C" { > > +#endif > > + > > #include <lttng/lttng-ust-tracef.h> > > > > extern > > @@ -35,4 +39,8 @@ void _lttng_ust_tracef(const char *fmt, ...); > > _lttng_ust_tracef(fmt, ## __VA_ARGS__); \ > > } while (0) > > > > +#ifdef __cplusplus > > +} > > +#endif > > + > > #endif /* _LTTNG_UST_TRACEF_H */ > > > > But since I've noticed in the history that this whole C guard has been > > reworked several times lately, I have no idea whether this is a good idea > > or > > not. > > Don't know if this has any relevance or anything, but both lttng-ust (along > > with its dependencies) and my test application are being cross-compiled. > > > > Hints? > > > > Indeed, that file seems to be missing guards. Your best bet would be > to submit a patch or open a bug against lttng-ust on bugs.lttng.org.
Fix pushed into master, please confirm that it fixes your issue: commit 866f2767f671ffbbff2c0511964f5a9a66358184 Author: Mathieu Desnoyers <[email protected]> Date: Tue May 13 09:34:03 2014 -0400 Fix: tracef.h: add missing c++ guard Signed-off-by: Mathieu Desnoyers <[email protected]> Thanks, Mathieu > > Thanks, > Jérémie > > > Thank you, > > Gerlando > > > > _______________________________________________ > > lttng-dev mailing list > > [email protected] > > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev > > > > -- > Jérémie Galarneau > EfficiOS Inc. > http://www.efficios.com > > _______________________________________________ > lttng-dev mailing list > [email protected] > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev > -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com _______________________________________________ lttng-dev mailing list [email protected] http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
