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With `-mcpu=power4`, code might use instructions like `fcfid`, excluding
older CPUs like the PowerPC G4, which apparently some users would like
to use. The generic `-mcpu=powerpc` should stick to pure 32-bit PowerPC
instructions.
Fixes rust-lang/cargo#3852.
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Using Ubuntu's cross-toolchains for powerpc* and s390x meant they were
depending on glibc symbols from Ubuntu 16.04. And if that host is ever
updated to a new release, the toolchains would raise the bar too.
This switches powerpc, powerpc64, and s390x to use crosstool-ng
toolchains, configured approximately like RHEL6 with kernel 2.6.32 and
glibc 2.12. This ABI level should also be compatible with Debian 7
(wheezy) and Ubuntu 12.04 (precise).
For powerpc64le, the challenge was that only glibc-2.19 officially added
support, but RHEL7 backported those changes to glibc-2.17. The backport
patches are complex and numerous, so instead of trying to push those
into crosstool-ng, this just uses glibc binaries directly from CentOS 7
and builds the toolchain manually.
This is ported from rust-lang/rust-buildbot#149.
r? @alexcrichton
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This commit updates the compilers for many of the artifacts that we're producing
on Travis. These compilers are all compiled by crosstool-ng as they're currently
done for the images in which we're building all our cross compiled compilers.
The purpose of this commit is that when we ship binaries the artifacts won't
require a newer glibc, but rather be as compatible as possible with Linux
distributions by working with a very old version of glibc.
This commit always allocates a new matrix entry for the i686/x86_64 builder.
This builder is dedicated to just producing artifacts and eventually we'll
expand it to building other tools like Cargo and the RLS. The other builders
testing i686 and x86_64 won't use these historical toolchains.
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