Is -finstrument-functions no longer supported?

[Weiss__Christian]

The OneAPI Fortran Compiler ifx (ifx (IFORT) 2022.1.0 20220316) does not list the option "-finstrument-functions" any more in its help page. Compiling with this option also fails.

Is "-finstrument-functions" no longer supported? Are there any plans on supporting it again in the future?

[Barbara_P_Intel]

"-finstrument-functions" is not supported with ifx.

[Ron_Green]

@Weiss__Christian I'm curious, do you have a need for this capability?  Or that you noticed that the ifx driver rejected it and were curious why the documentation didn't call this out as an 'ifort only' option?

Are you actually writing code to intercept the 

__cyg_profile_fun_[enter | exit] functions with your own instrumentation? 

In other words, what is your use and need for this option?

ron

[Weiss__Christian]

We have a profiler for HPC applications based on the function hooks: https://github.com/SX-Aurora/Vftrace

This will in its current form not be usable with the new Intel Fortran compiler.

[Ron_Green]

I see.  Yes, makes perfect sense why this is needed.  I will bring this request or need to the development team tomorrow and also with our product manager.   I do see the need and would like to see Vftrace to work with IFX.   Thank you for bringing this to my attention.

[Weiss__Christian]

Hi Ron,

thank you for having a look into this issue. 

I know that the cyg_profile hooks are a rather archaic feature, but I do not know of any other way to intercept function calls. However, I think its a simple and straightforward way to achieve this goal. Just out of curiosity, can you think of another way to intercept function calls in case this feature would be declared deprecated? 

[Ron_Green]

I don't know of another way to get this functionality. Plus, this is simple and is supported by multiple compilers.

I escalated this with the team and we agreed we need this in ifx. Seems it just got overlooked in our frantic development plan for ifx.

The bug ID is CMPLRLLVM-46942. We will update this Forum thread when we get this implemented in ifx.

[Ron_Green]

-finstrument-functions is now implemented for ifx in the 2024.0 release.