Newer versions of systemtap have some C++ code in their sys/sdt.h header
file (guarded by #ifdef __cpluplus). cpluspluscheck ends up wrapping
all of that into extern "C" { ... }, which ultimately results in
In file included from ./src/include/utils/probes.h:9:0, from ./src/include/pg_trace.h:15,
from/tmp/cpluspluscheck.VuUGok/test.cpp:3:
/usr/include/sys/sdt.h:71:1: error: template with C linkage
/usr/include/sys/sdt.h:81:1: error: template specialization with C linkage
/usr/include/sys/sdt.h:82:1: error: template specialization with C linkage
etc.
I don't think there is a way to escape back into C++ linkage inside an
extern "C" block.
If there is no better way, I suggest we exclude pg_trace.h and
utils/probes.h from cpluspluscheck.
