I am not sure whether this is a bug or the wrong I am using it. When I use
extern declaration as follows, I always have compilation error. I used the
easy-ust to demonstrate:
*diff --git a/doc/examples/easy-ust/sample_component_provider.h
b/doc/examples/easy-ust/sample_component_provider.h*
*index dd3c5f0..e70d650 100644*
*--- a/doc/examples/easy-ust/sample_component_provider.h*
*+++ b/doc/examples/easy-ust/sample_component_provider.h*
@@ -61,6 +61,8 @@
*/
#include <lttng/tracepoint.h>
+extern int testint(int i);
+
/*
* The following tracepoint event writes a message (c string) into the
* field message of the trace event message in the provider
*yanyh@vm*:*~/tools/lttng/lttng-ust/doc/examples/easy-ust*$ make
cc -I. \
-save-temps -c -o sample.o sample.c
cc -I. \
-save-temps -c -o tp.o tp.c
In file included from */usr/include/lttng/ust-tracepoint-event.h:974:0*,
from */usr/include/lttng/tracepoint-event.h:58*,
from *sample_component_provider.h:137*,
from *tp.c:33*:
*././sample_component_provider.h:64:1:* *error: *expected expression before
‘*extern*’
extern int testint(int i);
* ^*
Makefile:34: recipe for target 'tp.o' failed
make: *** [tp.o] Error 1
Thank you
Yonghong
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