I had a situation like this:
namespace my {
void f()
{
DTRACE_PROBE(my, f_probe);
}
}
After postprocessing with dtrace -G as shown in the manual, I get linker errors
showing undefined symbols of mangled C++ names. Looking into sys/sdt.h, it
turns out that the function declaration in the macro gets name-mangled. So I
made a separate .h file that will override linkage to C linkage, something like:
#define PROBELINK(name) extern void __dtrace_perun___##name(...)
extern "C" {
PROBELINK(f_probe);
// other probes
}
which gets included on top of every file. I also copied the system sys/sdt.h
to working directory and edited it by erasing extern declarations in
DTRACE_PROBE macros. [incidentally, extern "C" is allowed only on top-level
declarations in C++... strange.]
Now, the program links w/o errors, but the final executable does not include
any __dtrace_* symbols related to my probe points (checked by nm + grep).
Trying to dtrace with the sdt provider reports that there are no probes by the
defined name, here's an example script:
my$target:::f_probe
{ }
Has anyone managed to use the SDT provider from within C++ program? If so, I'd
be grateful for any guidance.
[PS: sorry for miserable grammar, I'm writing this in a hurry...]
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