dwblaikie wrote:

Reading LLVM IR lit CHECK lines from clang codegen is a bit difficult - could 
you include some simple examples (perhaps from the new clang tests in this 
patch) showing the DWARF output just as comments in this review for something 
more easily glanceable?

As for flags - I assume this will be way too expensive (do you have some 
numbers, eg: for a clang build inside google in a release config, or at least 
optimizations+debug info) to enable by default where we currently enable debug 
info and debug-info-for-profiling.

I'd expect this to be a fairly experimental feature - that it might not be 
feasible to make this compact enough to enable by default/maybe it's just 
infeasible to make this compact enough at all at which point we'd want to 
remove all this functionality. So maybe it goes under a -Xclang/cc1 flag only 
to start with, to allow exploration/experimentation, but with the expectation 
that folks won't depend on this until/unless it's able to be made compact 
enough.

https://github.com/llvm/llvm-project/pull/81545
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