[cfe-dev] Is there a nicer way to error than "llvm_unreachable" at CodeGen ?

[Mehdi Amini via cfe-dev]

Caution: `llvm_unreachable` is absolutely *not* intended to report error. It is only asserting when assertions are enabled, and compiled out to “nothing” in release build.

We have report_fatal_error(“…”) for ICE (internal compiler error) when we want a behavior that is “assertions in release mode”, but that’s also not intended to happen (IMO): ideally it should *not* be possible to trigger it with valid IR (yeah we’re not doing a good job at it…).

So yes, you can diagnose an error properly, using the LLVMContext. For example open llvm/lib/Target/AMDGPU/SIISelLowering.cpp and search for: DAG.getContext()->diagnose(NoGraphicsHSA);

— 
Mehdi


> On Jan 4, 2017, at 12:43 PM, Nat! via cfe-dev <cfe-dev at lists.llvm.org> wrote:
> 
> I would like to error and abandon compilation during code generation
> (after syntax/semantics is through), but not crash.
> 
> Ciao
>  Nat!
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