On Mon, Oct 29, 2007 at 01:43:19PM -0700, James McIlree wrote:
OS X doesn't support the older DTRACE_PROBE style macros, only
the newer (and much safer!) typechecked generated header files.
That makes sense to me, but some folks -- such as the Postgres folks --
were fond of the DTRACE_PROBE syntax. It might be worth figuring out why...
We did actually look at trying to support a compatibility mode with
being a no-op, but that turned out to be something of a slippery slope.
The harder I pulled on that thread, the more corner cases I found where
it fell over. As Steve mentioned, we know its an issue, and I filed:
<rdar://problem/5566030> Emulate dtrace -G for compatibility
Excellent. I wrote a wrapper script that emulates -G by just emitting an
effectively empty object file. Is there some edge case in which that
technique would be insufficient?
Your insight about the is-enabled probes is on target, if you attempt
to only use is-enabled probes, and never reference the actual dtrace
probe, you'll get link time errors.
I'm surprised the DTrace test suite didn't pick that up. Specifically, this
guy should have failed: