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{ lib, runCommand, rustc-unwrapped, sysroot ? null }:
runCommand "${rustc-unwrapped.pname}-wrapper-${rustc-unwrapped.version}" {
preferLocalBuild = true;
strictDeps = true;
inherit (rustc-unwrapped) outputs;
env = {
sysroot = lib.optionalString (sysroot != null) "--sysroot ${sysroot}";
# Upstream rustc still assumes that musl = static[1]. The fix for
# this is to disable crt-static by default for non-static musl
# targets.
#
# Even though Cargo will build build.rs files for the build platform,
# cross-compiling _from_ musl appears to work fine, so we only need
# to do this when rustc's target platform is dynamically linked musl.
#
# [1]: https://github.com/rust-lang/compiler-team/issues/422
#
# WARNING: using defaultArgs is dangerous, as it will apply to all
# targets used by this compiler (host and target). This means
# that it can't be used to set arguments that should only be
# applied to the target. It's fine to do this for -crt-static,
# because rustc does not support +crt-static host platforms
# anyway.
defaultArgs = lib.optionalString
(with rustc-unwrapped.stdenv.targetPlatform; isMusl && !isStatic)
"-C target-feature=-crt-static";
};
passthru = {
inherit (rustc-unwrapped) pname version src llvm llvmPackages;
unwrapped = rustc-unwrapped;
};
meta = rustc-unwrapped.meta // {
description = "${rustc-unwrapped.meta.description} (wrapper script)";
priority = 10;
};
} ''
mkdir -p $out/bin
ln -s ${rustc-unwrapped}/bin/* $out/bin
rm $out/bin/{rustc,rustdoc}
prog=${rustc-unwrapped}/bin/rustc extraFlagsVar=NIX_RUSTFLAGS \
substituteAll ${./rustc-wrapper.sh} $out/bin/rustc
prog=${rustc-unwrapped}/bin/rustdoc extraFlagsVar=NIX_RUSTDOCFLAGS \
substituteAll ${./rustc-wrapper.sh} $out/bin/rustdoc
chmod +x $out/bin/{rustc,rustdoc}
${lib.concatMapStrings (output: "ln -s ${rustc-unwrapped.${output}} \$${output}\n")
(lib.remove "out" rustc-unwrapped.outputs)}
''
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