llvm dev - Aug 2018 - Testing LLVM XRay

Hi All,

I am trying to test run clang XRay tool. I was following the steps at [1].
But the log file does not seem to get generated. According to the
instructions I used 'fxray-instrument' switch when compiling and then
specified 'patch_premain=true' at XRAY_OPTIONS. Is there anything else
that
I need to do? I am on a trunk build of clang. Could that be it? I am on
clang version 8.0.0 (trunk 340502).

Regards
Buddhika

[1] https://llvm.org/docs/XRayExample.html#id9

-- 
Research Assistant
Indiana University
Web: http://homes.soic.indiana.edu/budkahaw/
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The link should be

[1] https://llvm.org/docs/XRayExample.html#further-exploration

On Mon, Aug 27, 2018 at 1:33 PM, buddhika chamith <chamibuddhika at
gmail.com>
wrote:
> Hi All,
>
> I am trying to test run clang XRay tool. I was following the steps at [1].
> But the log file does not seem to get generated. According to the
> instructions I used 'fxray-instrument' switch when compiling and
then
> specified 'patch_premain=true' at XRAY_OPTIONS. Is there anything
else that
> I need to do? I am on a trunk build of clang. Could that be it? I am on
> clang version 8.0.0 (trunk 340502).
>
> Regards
> Buddhika
>
> [1] https://llvm.org/docs/XRayExample.html#id9
>
> --
> Research Assistant
> Indiana University
> Web: http://homes.soic.indiana.edu/budkahaw/
>


-- 
Research Assistant
Indiana University
Web: http://homes.soic.indiana.edu/budkahaw/
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Hi Buddhika,

On Tue, 28 Aug 2018 at 3:36 am, buddhika chamith via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> The link should be
>
> [1] https://llvm.org/docs/XRayExample.html#further-exploration
>
> On Mon, Aug 27, 2018 at 1:33 PM, buddhika chamith <chamibuddhika at
gmail.com
> > wrote:
>
>> Hi All,
>>
>> I am trying to test run clang XRay tool. I was following the steps at
>> [1]. But the log file does not seem to get generated. According to the
>> instructions I used 'fxray-instrument' switch when compiling
and then
>> specified 'patch_premain=true' at XRAY_OPTIONS. Is there
anything else that
>> I need to do? I am on a trunk build of clang. Could that be it? I am on
>> clang version 8.0.0 (trunk 340502).
>>
>
Apologies for that, it seems the documentation is out of date. You need to
add `xray_mode=xray-basic` to the options. That should look like:

XRAY_OPTIONS="patch_premain=true:xray_mode=xray-basic"

We should update the documentation with that. Note that
llvm.org/docs/XRay.html should already have the updated instructions.

Cheers
-- 
Dean
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