Fix "Argument list too long" when building with windows-gnu target

[chaoticlonghair]

When building rust-rocksdb with target x86_64-pc-windows-gnu (mingw-w64-x86_64-rust in msys2), the compiler throw the error ar: Argument list too long.

[alexcrichton]

Thanks for the PR! Would it be possible to perhaps take a different strategy though? I think we can call the ar command multiple times (although maybe with a different set of flags) to incrementally add objects to an archive. I think that may be a bit easier than trying to lump it all into one go?

[chaoticlonghair]

call the ar command multiple times

OK, I will try this.

[VZout]

I'm running into this issue as well. @alexcrichton could you elaborate on your feedback?

As I understand it cc-rs supports response files for the msvc target but no other targets. This PR adds that.
Do you want to "redesign/move" how response files are handled in general?

Minor side note: https://github.com/alexcrichton/cc-rs/pull/496/files#diff-b4aea3e418ccdb71239b96952d9cddb6R1705
Should be host not target to support cross compiling.

[alexcrichton]

I don't think it's necessary to use response files here, I think we can call the archiver multiple times to add objects, which should simplify this PR

[NobodyXu]

#564 should have already fixed this issue, closing this PR