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build-support/rust: toTargetArch: strip off endianness

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`toTargetArch` in `pkgs/build-support/rust/lib/default.nix` is used to
set `CARGO_CFG_TARGET_ARCH`.  This environment variable is supposed to
be the `<arch>` portion of an LLVM-style platform name:

```
<arch><sub>-<kernel>-<libc><abi>
```

Note that the pointer-width (the "64" in "x86_64" and "mips64") is
part of `<arch>`, but the endianness (the `_be` in `aarch64_be`) is
*not*.

Unfortunately at the moment nixpkgs' parsed `cpuType` has no way to
query for the three subparts (name, pointer-width, and
subarch/endianness), nor any way to ask for just the first two parts.

For now, this commit simply fixes the problem in the two cases that
matter: `mips64el` and `powerpc64le`, which I believe are the only two
platforms supported by both rust and nixpkgs which have a
"subarchitecture".
This commit is contained in:
Adam Joseph 2022-08-22 02:05:50 -07:00
parent eaf476b608
commit 8682bd0a81
1 changed files with 2 additions and 0 deletions
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2
pkgs/build-support/rust/lib/default.nix
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@ -5,6 +5,8 @@ rec {
toTargetArch = platform:
/**/ if platform ? rustc.platform then platform.rustc.platform.arch
else if platform.isAarch32 then "arm"
else if platform.isMips64 then "mips64" # never add "el" suffix
else if platform.isPower64 then "powerpc64" # never add "le" suffix
else platform.parsed.cpu.name;
# https://doc.rust-lang.org/reference/conditional-compilation.html#target_os