Hi, I was adding an LTTng UST 2.0 tracepoint to an application that uses
-warn-common (see http://www.math.utah.edu/docs/info/ld_2.html). I
created a simple tracepoint, had lttng-gen-tp produce tracepoints.o,
then linked that to the application, along with -llttng-ust. This
results in some warnings:
tracepoints.o: warning: common of `handle' overridden by definition
/usr/local/lib/liblttng-ust.so: warning: defined here
tracepoints.o: warning: common of `lttng_client_callbacks_overwrite' overridden
by definition
/usr/local/lib/liblttng-ust.so: warning: defined here
tracepoints.o: warning: common of `lttng_client_callbacks_discard' overridden
by definition
/usr/local/lib/liblttng-ust.so: warning: defined here
tracepoints.o: warning: common of `lttng_client_callbacks_metadata' overridden
by definition
/usr/local/lib/liblttng-ust.so: warning: defined here
/usr/local/lib/liblttng-ust-tracepoint.so.0: warning: multiple common of
`handle'
tracepoints.o: warning: previous common is here
This seems to be a valid warning. The LTTng UST headers contain
definitions like this in include/lttng/ringbuffer-config.h:
struct lttng_ust_shm_handle *handle;
If two objects use that header, each will get a copy of "handle", right?
--
Hollis Blanchard
Mentor Graphics, Embedded Systems Division
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