Bug 16511 – Suspected Win64 release-mode code-gen bug

I've reveived a bug report on a lib of mine that I'm suspecting may be a 64-bit release-mode code-gen bug, because it involves what, at least *appears*, to be a fiber overflowing its stack *ONLY* on 64-bit in release mode. I could understand a stack overlflow on 32-bit-only, but this seems backwards. And a release-mode-only crash seems to suggest a code-gen bug as well. Sorry I dont have a reduced case right now, but you can reproduce like this: On a Win64 machine with DUB 1.0.0 <http://code.dlang.org/files/dub-1.0.0-setup.exe>: - Download this Gist to a fresh directory: https://gist.github.com/MrSmith33/c2f435937aefbc3eead25aa873363d84 - From that directory, run: > dub --arch=x86_64 --build=release --verbose --compiler=dmd It will build, run, and then crash. Omitting *either* of --arch=x86_64 or --build=release will eliminate the crash.

Just for the sake of reference, the original report/conversation is here: https://github.com/Abscissa/libInputVisitor/issues/1

Got a report of the crash happening with both --build=debug (dub's default) and --build=release. It only crashes with --build=release for me. So not really sure what's going on. In my lib, I'm going to be working around it, but wanted to post this here in case there is an underlying codegen thing.

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