97 lines
4.6 KiB
Nix
97 lines
4.6 KiB
Nix
{ lib
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, stdenv
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, pkgsBuildHost
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, pkgsBuildTarget
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, pkgsTargetTarget
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}:
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rec {
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# These environment variables must be set when using `cargo-c` and
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# several other tools which do not deal well with cross
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# compilation. The symptom of the problem they fix is errors due
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# to buildPlatform CFLAGS being passed to the
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# hostPlatform-targeted compiler -- for example, `-m64` being
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# passed on a build=x86_64/host=aarch64 compilation.
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envVars = let
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# As a workaround for https://github.com/rust-lang/rust/issues/89626 use lld on pkgsStatic aarch64
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shouldUseLLD = platform: platform.isAarch64 && platform.isStatic && !stdenv.isDarwin;
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ccForBuild = "${pkgsBuildHost.stdenv.cc}/bin/${pkgsBuildHost.stdenv.cc.targetPrefix}cc";
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cxxForBuild = "${pkgsBuildHost.stdenv.cc}/bin/${pkgsBuildHost.stdenv.cc.targetPrefix}c++";
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linkerForBuild = ccForBuild;
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ccForHost = "${stdenv.cc}/bin/${stdenv.cc.targetPrefix}cc";
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cxxForHost = "${stdenv.cc}/bin/${stdenv.cc.targetPrefix}c++";
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linkerForHost = if shouldUseLLD stdenv.targetPlatform
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&& !stdenv.cc.bintools.isLLVM
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then "${pkgsBuildHost.llvmPackages.bintools}/bin/${stdenv.cc.targetPrefix}ld.lld"
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else ccForHost;
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# Unfortunately we must use the dangerous `pkgsTargetTarget` here
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# because hooks are artificially phase-shifted one slot earlier
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# (they go in nativeBuildInputs, so the hostPlatform looks like
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# a targetPlatform to them).
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ccForTarget = "${pkgsTargetTarget.stdenv.cc}/bin/${pkgsTargetTarget.stdenv.cc.targetPrefix}cc";
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cxxForTarget = "${pkgsTargetTarget.stdenv.cc}/bin/${pkgsTargetTarget.stdenv.cc.targetPrefix}c++";
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linkerForTarget = if shouldUseLLD pkgsTargetTarget.stdenv.targetPlatform
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&& !pkgsTargetTarget.stdenv.cc.bintools.isLLVM # whether stdenv's linker is lld already
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then "${pkgsBuildTarget.llvmPackages.bintools}/bin/${pkgsTargetTarget.stdenv.cc.targetPrefix}ld.lld"
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else ccForTarget;
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rustBuildPlatform = stdenv.buildPlatform.rust.rustcTarget;
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rustBuildPlatformSpec = stdenv.buildPlatform.rust.rustcTargetSpec;
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rustHostPlatform = stdenv.hostPlatform.rust.rustcTarget;
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rustHostPlatformSpec = stdenv.hostPlatform.rust.rustcTargetSpec;
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rustTargetPlatform = stdenv.targetPlatform.rust.rustcTarget;
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rustTargetPlatformSpec = stdenv.targetPlatform.rust.rustcTargetSpec;
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in {
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inherit
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ccForBuild cxxForBuild linkerForBuild rustBuildPlatform rustBuildPlatformSpec
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ccForHost cxxForHost linkerForHost rustHostPlatform rustHostPlatformSpec
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ccForTarget cxxForTarget linkerForTarget rustTargetPlatform rustTargetPlatformSpec;
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# Prefix this onto a command invocation in order to set the
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# variables needed by cargo.
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#
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setEnv = ''
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env \
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''
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# Due to a bug in how splicing and pkgsTargetTarget works, in
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# situations where pkgsTargetTarget is irrelevant
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# pkgsTargetTarget.stdenv.cc is often simply wrong. We must omit
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# the following lines when rustTargetPlatform collides with
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# rustHostPlatform.
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+ lib.optionalString (rustTargetPlatform != rustHostPlatform) ''
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"CC_${stdenv.targetPlatform.rust.cargoEnvVarTarget}=${ccForTarget}" \
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"CXX_${stdenv.targetPlatform.rust.cargoEnvVarTarget}=${cxxForTarget}" \
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"CARGO_TARGET_${stdenv.targetPlatform.rust.cargoEnvVarTarget}_LINKER=${linkerForTarget}" \
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'' + ''
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"CC_${stdenv.hostPlatform.rust.cargoEnvVarTarget}=${ccForHost}" \
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"CXX_${stdenv.hostPlatform.rust.cargoEnvVarTarget}=${cxxForHost}" \
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"CARGO_TARGET_${stdenv.hostPlatform.rust.cargoEnvVarTarget}_LINKER=${linkerForHost}" \
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'' + ''
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"CC_${stdenv.buildPlatform.rust.cargoEnvVarTarget}=${ccForBuild}" \
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"CXX_${stdenv.buildPlatform.rust.cargoEnvVarTarget}=${cxxForBuild}" \
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"CARGO_TARGET_${stdenv.buildPlatform.rust.cargoEnvVarTarget}_LINKER=${linkerForBuild}" \
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"CARGO_BUILD_TARGET=${rustBuildPlatform}" \
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"HOST_CC=${pkgsBuildHost.stdenv.cc}/bin/cc" \
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"HOST_CXX=${pkgsBuildHost.stdenv.cc}/bin/c++" \
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'';
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};
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} // lib.mapAttrs (old: new: platform:
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# TODO: enable warning after 23.05 is EOL.
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# lib.warn "`rust.${old} platform` is deprecated. Use `platform.rust.${new}` instead."
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lib.getAttrFromPath new platform.rust)
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{
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toTargetArch = [ "platform" "arch" ];
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toTargetOs = [ "platform" "os" ];
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toTargetFamily = [ "platform" "target-family" ];
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toTargetVendor = [ "platform" "vendor" ];
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toRustTarget = [ "rustcTarget" ];
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toRustTargetSpec = [ "rustcTargetSpec" ];
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toRustTargetSpecShort = [ "cargoShortTarget" ];
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toRustTargetForUseInEnvVars = [ "cargoEnvVarTarget" ];
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IsNoStdTarget = [ "isNoStdTarget" ];
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}
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