Cross compilation to 32-bit may be broken on recent nightlies

[alexcrichton]

As of a few nights ago I've noticed that a good bit of the Travis CI runs I've got that cross compile to 32-bit are now broken due to odd linker errors, for example https://travis-ci.org/alexcrichton/cc-rs/builds/290881204.

I bisected nightlies to this range, and @michaelwoerister I wonder if this is related to the change to sip128? Do you know of anything there that would cause linker errors?

Unfortunately I haven't been able to reproduce on Linux, I've just seen this on OSX and Windows

[carols10cents]

manifests as these CI failures in cargo: rust-lang/cargo#4658

[alexcrichton]

Cc @michaelwoerister

[michaelwoerister]

Yes, when switching to SipHash I also switched away from using leb128 for all integers. That might introduce a difference for isize and usize. I'll take a look.