Following legacy packing conventions, `isArm` was defined just for
32-bit ARM instruction set. This is confusing to non packagers though,
because Aarch64 is an ARM instruction set.
The official ARM overview for ARMv8[1] is surprisingly not confusing,
given the overall state of affairs for ARM naming conventions, and
offers us a solution. It divides the nomenclature into three levels:
```
ISA: ARMv8 {-A, -R, -M}
/ \
Mode: Aarch32 Aarch64
| / \
Encoding: A64 A32 T32
```
At the top is the overall v8 instruction set archicture. Second are the
two modes, defined by bitwidth but differing in other semantics too, and
buttom are the encodings, (hopefully?) isomorphic if they encode the
same mode.
The 32 bit encodings are mostly backwards compatible with previous
non-Thumb and Thumb encodings, and if so we can pun the mode names to
instead mean "sets of compatable or isomorphic encodings", and then
voilà we have nice names for 32-bit and 64-bit arm instruction sets
which do not use the word ARM so as to not confused either laymen or
experienced ARM packages.
[1]: https://developer.arm.com/products/architecture/a-profile
The only common use case so far seems ARMv6/ARMv7 support.
The way this option is exposed might collide with a package with the
same name. Also the option naming on its own is not self-descriptive
without context.
The default NixOS kernels for ARMv7 (and probably ARMv6) do not have support
for transparent huge pages, but jemalloc is unable to detect this. This is a
known bug and the current solution is to pass --disable-thp to ./configure.
The default darwin build added a je_ prefix to all exported symbols, and
that broke downstream consumers that were not expecting the prefix, like
mariadb.
rustc: 1.2.0 -> 1.3.0
rustcMaster: 2015-09-05 -> 2015-09-21
This also removes the llvm bundling which reduced immediate the closure size
by ~50MB. It also tries to reduce some of the superfluous dependencies
to help reduce the number of potential rebuilds (namely removing git).
