cargoSetupHook: pass host config flags
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@ -27,7 +27,7 @@ cargoSetupPostUnpackHook() {
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cat ${tmp_config} >> .cargo/config
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cat >> .cargo/config <<'EOF'
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@rustTarget@
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@cargoConfig@
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EOF
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echo "Finished cargoSetupPostUnpackHook"
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@ -68,15 +68,37 @@ in {
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# The `.nativeDrv` stanza works like nativeBuildInputs and ensures cross-compiling has the right version available.
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diff = "${diffutils.nativeDrv or diffutils}/bin/diff";
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# Target platform
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rustTarget = ''
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[target."${rust.toRustTarget stdenv.buildPlatform}"]
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# We want to specify the correct crt-static flag for both
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# the build and host platforms. This is important when the wanted
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# value for crt-static does not match the defaults in the rustc target,
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# like for pkgsMusl or pkgsCross.musl64; Upstream rustc still assumes
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# that musl = static[1].
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#
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# By default, Cargo doesn't apply RUSTFLAGS when building build.rs
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# if --target is passed, so the only good way to set crt-static for
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# build.rs files is to use the unstable -Zhost-config Cargo feature.
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# This allows us to specify flags that should be passed to rustc
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# when building for the build platform. We also need to use
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# -Ztarget-applies-to-host, because using -Zhost-config requires it.
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#
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# When doing this, we also have to specify the linker, or cargo
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# won't pass a -C linker= argument to rustc. This will make rustc
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# try to use its default value of "cc", which won't be available
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# when cross-compiling.
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#
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# [1]: https://github.com/rust-lang/compiler-team/issues/422
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cargoConfig = ''
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[host]
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"linker" = "${ccForBuild}"
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${lib.optionalString (stdenv.buildPlatform.config != stdenv.hostPlatform.config) ''
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[target."${shortTarget}"]
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"linker" = "${ccForHost}"
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''}
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"rustflags" = [ "-C", "target-feature=${if stdenv.buildPlatform.isStatic then "+" else "-"}crt-static" ]
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[target."${shortTarget}"]
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"linker" = "${ccForHost}"
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"rustflags" = [ "-C", "target-feature=${if stdenv.hostPlatform.isStatic then "+" else "-"}crt-static" ]
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[unstable]
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host-config = true
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target-applies-to-host = true
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'';
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};
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} ./cargo-setup-hook.sh) {};
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