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rust.lib: add toRustTargetForUseInEnvVars #251539

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rust.lib: add toRustTargetForUseInEnvVars #251539

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11 changes: 11 additions & 0 deletions pkgs/build-support/rust/lib/default.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,17 @@ rec {
then builtins.toFile (toRustTarget platform + ".json") (builtins.toJSON platform.rustc.platform)
else toRustTarget platform;

# When used as part of an environment variable name, triples are
# uppercased and have all hyphens replaced by underscores:
#
# https://github.com/rust-lang/cargo/pull/9169
# https://github.com/rust-lang/cargo/issues/8285#issuecomment-634202431
#
toRustTargetForUseInEnvVars = platform:
lib.strings.replaceStrings ["-"] ["_"]
(lib.strings.toUpper
(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
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