[llvm-dev] lld: ELF/COFF main() interface

[Rafael Espíndola via llvm-dev]

> I believe, however, that even when we want this functionality in a library, we don't want the implementation to be "error_code spaghetti."

My opinion too. If some utility code is really useful, sure, we add
error_code and move it to llvm, but I would like to avoid having all
of lld look like that.

> I propose that, for the purpose of treating lld as a library, we enable exception handling and use C++ exceptions. All of my users who use LLVM components as a library (for JIT, etc.) insist that I build LLVM with exceptions (and RTTI for that matter) enabled. For the purpose of creating a stand-alone lld build, we could certainly build with exceptions disabled if that yields a measurable performance difference.
>
> Thoughts?

Something along those lines should work. We would probably still need
a diag handler, but it would now *not* be fatal and 'error' would look
like

* call diag handler
* if no exceptions, exit(1)
* else, throw

The reason being that it is a lot easier to print errors close to
where they are found and we want to do it when exceptions are disabled
too.

Thanks,
Rafael