[llvm] r328805 - Reapply "[DWARFv5] Emit file 0 to the line table."

[via llvm-commits]

Hey Paul,

I've been experimenting with DWARFv5 broadly applied to some code at Google & found that clang crashes when trying to emit DWARFv5 on an empty assembly file. Turns out llvm-mc does not because of the above code block.

Seems this support is here for llvm-mc, but missing from clang's initialization of MCContext for cc1as.

Could you refactor/common/add equivalent functionality to Clang's cc1as? (looks like somewhere near clang/tools/driver/cc1as_main.cpp:400? (since that is where "setMainFileName" is, which is near this block in llvm-mc too))

- Dave

You mean, like a zero-length file?  For me, `llvm-mc –g t.s` also crashes with that.  Or a .s file with only a comment in it.
Looks like clang and llvm-mc crash in different places too.

I'll take a look.
--paulr
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20190128/1fdb0845/attachment.html>