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Re: Systemtap's DTRACE_PROBE and clang


On 09/20/2013 01:26 PM, Martin Martin wrote:
> You also need % for the other section in sys/sdt.h, progbits, and then it works!

In my brief attempt, it appears that GCC *doesn't* want that escaped to
%%progbits - I guess because there are no operands to expand in that
particular asm statement?  Is that true for clang too?

> 
> On Fri, Sep 20, 2013 at 4:02 PM, Josh Stone <jistone@redhat.com> wrote:
>> On 09/20/2013 11:59 AM, Frank Ch. Eigler wrote:
>>>
>>> martin wrote:
>>>
>>>> [...]
>>>> How onerous is it to change the code here? [...]
>>>> Workaround for now, it does work if you change it to:
>>>>   .pushsection .note.stapsdt,"?",@note
>>>
>>> I don't recall any deep discusson on that topic.  It could be
>>> just to immunize it from being misinterpreted as a comment
>>> (see the @-comment-on-arm line on the same AS doc page).
>>
>> Based on that, I'm experimenting with %note instead.  It's a little more
>> complicated since that has to be escaped to %%note for C probes, but not
>> escaped for probes in pure ASM source files.  But that's just an #ifdef
>> __ASSEMBLER__, and so far this seems to work.
>>
>> I'd appreciate if you can confirm it with your "?"-patched clang.
>>
>> Thanks,
>> Josh


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