So I have no idea what I'm doing with Phabricator, and I have no idea how to update [[ https://reviews.llvm.org/D35077 | the previous request ]]. I chose 'update diff' and made a new one, and I don't see a way to delete it, so here we are. I apologise for the noise, but now that we're here... This update to the diff attempts to hit all of @smeenai's requests. In order: - LLVM_BUILD_LLVM_C_DYLIB defaults to off on windows, and the comment is gone - Parens are used to make clear what's going on in the complicated if statement. - The "always build on windows" comment has been removed, as it is no longer true. - The python script now takes an `--underscore` flag, rather than an arch, and --underscore is only set on x86. - `llvm-nm -g` is now used instead of `dumpbin /linkermember:1`. I've built the DLL on 64 bit, and it seems to be correct. Still need to test 32 bit, and make sure nothing is amiss on non-windows platforms. If this needs to be folded into the D35077 differential, I'll need some pointers on how to do so. Thanks, and sorry again!