[issue4111] Add DTrace probes

[Skip Montanaro]

Skip Montanaro <skip at pobox.com> added the comment:

Laca> Please see here for discussion about the -G flag on OS X:
    Laca> http://markmail.org/message/4nheqnexjr2o6mcx

    Laca> If I read it correctly, on OS X, you will need to use -h instead
    Laca> of -G and it won't emit an object file (dtrace.o) so you will not
    Laca> need to link it.

    Laca> Unfortunately, this means that the makefile will have to be
    Laca> different on Solaris and OS X :(

We can worm around that using configure.  Thanks for the reference.  That
will go a long way toward getting the Sun dtrace probes working on Mac OSX.
For reference by others, here's Lee Packham's dtrace patch for PostgreSQL on
Mac OSX: http://blog.leenux.org.uk/wp-content/uploads/2008/10/postgresql-825-fixosxdtracediff.gz

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