Travis OSX doesn't like LDC 1.2 as host compiler

[kinke]

See here:

error: Invalid bitcode version (Producer: '800.0.42.1_0' Reader: '703.0.31_0')

I guess because the 1.2 binary uses LLVM 4.0. No idea why there's any bitcode involved though.

[JohanEngelen]

Hm, this may be an high-priority issue.
https://stackoverflow.com/questions/38875117/error-invalid-bitcode-version-producer-800-0-35-0-0-reader-703-0-31-0

Is it that the Mac binaries that I built are not usable on other people's systems if they don't have xcode 8?

[dnadlinger]

It seems more like something related to the object files we produce?

[kinke]

For Travis, we may use other OSX images with Xcode 8+: https://docs.travis-ci.com/user/osx-ci-environment#OS-X-Version

[JohanEngelen]

I am thinking it is either the object files we produce, or the phobos/druntime stdlib archives (they contain a bit of C code, so it's not all produced by us and its archived by my XCode 8 archiver).

[dnadlinger]

For Travis, we may use other OSX images with Xcode 8+: https://docs.travis-ci.com/user/osx-ci-environment#OS-X-Version

I'd rather we fix the binary packages to work with Xcode 7 as well for better compatibility with people using older systems.

[JohanEngelen]

This apparently is caused by enabling LTO while building LDC: see #2082 .
I haven't looked further into this yet, but for now I will not enable LTO while building binary packages on Mac, and will replace the 1.2.0 binary on the release page.

[kinke]

Fixed by #2083.