Re: RFC: Standalone AutoFDO Profile Tool for GCC

>> 
>> 1. Simplicity - One job: turn samples (from file or live) into
>> AutoFDO profiles that can be consumed by the GCC AutoFDO toolchain.
>> 
>> 2. Minimal dependencies -  Dependent only on libraries such as libdwarf
>> for DWARF parsing (no large frameworks).
> 
> Could we reuse libbacktrace's code here? Instead of requiring libdwarf
> and libelf as a dependency?
> Or maybe libiberty/simple-object code?
> 
> libbacktrace/elf.c is copyrighted by the FSF even. I can even see this
> tool being supported on Mac OS (though I don't know if there is a perf
> like tool there).
> 
> LTO used to depend on libelf but that was removed years ago in favor
> of using simple-object.
> libbacktrace will be updated to support the newer dwarf standards as
> they are added to GCC/gas especially when it comes to lines support.
> Depending on the version of libdwarf has one extra issue of needing
> the version that support dwarf5 (and soon 6).

Thanks for the feedback. I tried recreating with libbacktrace.
AFIK, we however would need ibdw to get the discriminater unless we change libbacktrace.
libbacktrace looks to me like a better solution given version issues you mentioned.

Thanks,
Kugan