I'm not able to reproduce, what compiler are you using?
James M
On Jul 27, 2011, at 4:00 PM, Brendan Gregg wrote:
> G'Day,
>
> The way isenabled probes are compiled on Mac OS X Lion has changed in a way
> that dosen't compile (at least, with some compilers). Here's the test to try:
>
> $ cat -n liontest.d
> 1 provider lion {
> 2 probe hello(const char *world);
> 3 };
> $ dtrace -h -s liontest.d -o liontest.h
>
> On Snow Leopard this output:
>
> $ cat -n liontest.h
> [...]
> 24 #define LION_HELLO_ENABLED() \
> 25 __dtrace_isenabled$lion$hello$v1()
>
> On Lion that is now:
>
> $ can -n liontest.h
> [...]
> 26 #define LION_HELLO_ENABLED() \
> 27 ({ int _r = __dtrace_isenabled$lion$hello$v1(); \
> 28 __asm__ volatile(""); \
> 29 _r; })
>
> Which doesn't compile when used in if statements (the use case for
> isenabled). Which means, some software that has DTrace probes is now not
> compiling on Lion.
>
> Another difference is the addition of:
>
> #if !defined(DTRACE_PROBES_DISABLED) || !DTRACE_PROBES_DISABLED
>
> but I don't think that is breaking anything.
>
> I've attached both header files from the OS versions. Does Apple know of
> this?
>
> thanks,
>
> Brendan
>
> --
> Brendan Gregg, Joyent http://dtrace.org/blogs/brendan
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