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treewide: isArm -> isAarch32

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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

(cherry picked from commit ba52ae5048)
This commit is contained in:
John Ericson
2018-03-19 22:41:06 -04:00
parent 1a72330ab0
commit b9acfb4ecf
69 changed files with 109 additions and 106 deletions
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4
pkgs/build-support/bintools-wrapper/default.nix
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@@ -55,7 +55,7 @@ let
else if targetPlatform.system == "i686-linux" then "${libc_lib}/lib/ld-linux.so.2"
else if targetPlatform.system == "x86_64-linux" then "${libc_lib}/lib/ld-linux-x86-64.so.2"
# ARM with a wildcard, which can be "" or "-armhf".
else if (with targetPlatform; isArm && isLinux) then "${libc_lib}/lib/ld-linux*.so.3"
else if (with targetPlatform; isAarch32 && isLinux) then "${libc_lib}/lib/ld-linux*.so.3"
else if targetPlatform.system == "aarch64-linux" then "${libc_lib}/lib/ld-linux-aarch64.so.1"
else if targetPlatform.system == "powerpc-linux" then "${libc_lib}/lib/ld.so.1"
else if targetPlatform.isMips then "${libc_lib}/lib/ld.so.1"
@@ -174,7 +174,7 @@ stdenv.mkDerivation {
sep = optionalString (!targetPlatform.isMips) "-";
arch =
/**/ if targetPlatform.isAarch64 then endianPrefix + "aarch64"
else if targetPlatform.isArm then endianPrefix + "arm"
else if targetPlatform.isAarch32 then endianPrefix + "arm"
else if targetPlatform.isx86_64 then "x86-64"
else if targetPlatform.isi686 then "i386"
else if targetPlatform.isMips then {