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{ lib }:
rec {
# https://doc.rust-lang.org/reference/conditional-compilation.html#target_arch
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
toTargetOs = platform:
/**/ if platform ? rustc.platform then platform.rustc.platform.os or "none"
else if platform.isDarwin then "macos"
else platform.parsed.kernel.name;
# https://doc.rust-lang.org/reference/conditional-compilation.html#target_family
toTargetFamily = platform:
if platform ? rustc.platform.target-family
then
(
# Since https://github.com/rust-lang/rust/pull/84072
# `target-family` is a list instead of single value.
let
f = platform.rustc.platform.target-family;
in
if builtins.isList f then f else [ f ]
)
else lib.optional platform.isUnix "unix"
++ lib.optional platform.isWindows "windows";
# https://doc.rust-lang.org/reference/conditional-compilation.html#target_vendor
toTargetVendor = platform: let
inherit (platform.parsed) vendor;
in platform.rustc.platform.vendor or {
"w64" = "pc";
}.${vendor.name} or vendor.name;
# Returns the name of the rust target, even if it is custom. Adjustments are
# because rust has slightly different naming conventions than we do.
toRustTarget = platform: let
inherit (platform.parsed) cpu kernel abi;
cpu_ = platform.rustc.platform.arch or {
"armv7a" = "armv7";
"armv7l" = "armv7";
"armv6l" = "arm";
"armv5tel" = "armv5te";
"riscv64" = "riscv64gc";
}.${cpu.name} or cpu.name;
vendor_ = toTargetVendor platform;
in platform.rustc.config
or "${cpu_}-${vendor_}-${kernel.name}${lib.optionalString (abi.name != "unknown") "-${abi.name}"}";
# Returns the name of the rust target if it is standard, or the json file
# containing the custom target spec.
toRustTargetSpec = platform:
if platform ? rustc.platform
then builtins.toFile (toRustTarget platform + ".json") (builtins.toJSON platform.rustc.platform)
else toRustTarget platform;
# Returns true if the target is no_std
# https://github.com/rust-lang/rust/blob/2e44c17c12cec45b6a682b1e53a04ac5b5fcc9d2/src/bootstrap/config.rs#L415-L421
IsNoStdTarget = platform: let rustTarget = toRustTarget platform; in
builtins.any (t: lib.hasInfix t rustTarget) ["-none" "nvptx" "switch" "-uefi"];
}
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