rust: allow linker to be different from compiler

2 files changed, 12 insertions, 8 deletions

diff --git a/pkgs/build-support/rust/hooks/default.nix b/pkgs/build-support/rust/hooks/default.nix
index 7703ff4abad49..874f23fe7ed39 100644
--- a/pkgs/build-support/rust/hooks/default.nix
+++ b/pkgs/build-support/rust/hooks/default.nix
@@ -66,10 +66,10 @@
 
         cargoConfig = ''
           [target."${stdenv.buildPlatform.rust.rustcTarget}"]
-          "linker" = "${rust.envVars.ccForBuild}"
+          "linker" = "${rust.envVars.linkerForBuild}"
           ${lib.optionalString (stdenv.buildPlatform.config != stdenv.hostPlatform.config) ''
             [target."${stdenv.hostPlatform.rust.rustcTarget}"]
-            "linker" = "${rust.envVars.ccForHost}"
+            "linker" = "${rust.envVars.linkerForHost}"
           ''}
           "rustflags" = [ "-C", "target-feature=${if stdenv.hostPlatform.isStatic then "+" else "-"}crt-static" ]
         '';
diff --git a/pkgs/build-support/rust/lib/default.nix b/pkgs/build-support/rust/lib/default.nix
index dad8ab5282357..6645715eb2c86 100644
--- a/pkgs/build-support/rust/lib/default.nix
+++ b/pkgs/build-support/rust/lib/default.nix
@@ -14,8 +14,11 @@ rec {
   envVars = let
     ccForBuild = "${buildPackages.stdenv.cc}/bin/${buildPackages.stdenv.cc.targetPrefix}cc";
     cxxForBuild = "${buildPackages.stdenv.cc}/bin/${buildPackages.stdenv.cc.targetPrefix}c++";
+    linkerForBuild = ccForBuild;
+
     ccForHost = "${stdenv.cc}/bin/${stdenv.cc.targetPrefix}cc";
     cxxForHost = "${stdenv.cc}/bin/${stdenv.cc.targetPrefix}c++";
+    linkerForHost = ccForHost;
 
     # Unfortunately we must use the dangerous `targetPackages` here
     # because hooks are artificially phase-shifted one slot earlier
@@ -23,6 +26,7 @@ rec {
     # a targetPlatform to them).
     ccForTarget = "${targetPackages.stdenv.cc}/bin/${targetPackages.stdenv.cc.targetPrefix}cc";
     cxxForTarget = "${targetPackages.stdenv.cc}/bin/${targetPackages.stdenv.cc.targetPrefix}c++";
+    linkerForTarget = ccForTarget;
 
     rustBuildPlatform = stdenv.buildPlatform.rust.rustcTarget;
     rustBuildPlatformSpec = stdenv.buildPlatform.rust.rustcTargetSpec;
@@ -32,9 +36,9 @@ rec {
     rustTargetPlatformSpec = stdenv.targetPlatform.rust.rustcTargetSpec;
   in {
     inherit
-      ccForBuild  cxxForBuild  rustBuildPlatform   rustBuildPlatformSpec
-      ccForHost   cxxForHost   rustHostPlatform    rustHostPlatformSpec
-      ccForTarget cxxForTarget rustTargetPlatform  rustTargetPlatformSpec;
+      ccForBuild  cxxForBuild  linkerForBuild  rustBuildPlatform   rustBuildPlatformSpec
+      ccForHost   cxxForHost   linkerForHost   rustHostPlatform    rustHostPlatformSpec
+      ccForTarget cxxForTarget linkerForTarget rustTargetPlatform  rustTargetPlatformSpec;
 
     # Prefix this onto a command invocation in order to set the
     # variables needed by cargo.
@@ -50,15 +54,15 @@ rec {
     + lib.optionalString (rustTargetPlatform != rustHostPlatform) ''
       "CC_${stdenv.targetPlatform.rust.cargoEnvVarTarget}=${ccForTarget}" \
       "CXX_${stdenv.targetPlatform.rust.cargoEnvVarTarget}=${cxxForTarget}" \
-      "CARGO_TARGET_${stdenv.targetPlatform.rust.cargoEnvVarTarget}_LINKER=${ccForTarget}" \
+      "CARGO_TARGET_${stdenv.targetPlatform.rust.cargoEnvVarTarget}_LINKER=${linkerForTarget}" \
     '' + ''
       "CC_${stdenv.hostPlatform.rust.cargoEnvVarTarget}=${ccForHost}" \
       "CXX_${stdenv.hostPlatform.rust.cargoEnvVarTarget}=${cxxForHost}" \
-      "CARGO_TARGET_${stdenv.hostPlatform.rust.cargoEnvVarTarget}_LINKER=${ccForHost}" \
+      "CARGO_TARGET_${stdenv.hostPlatform.rust.cargoEnvVarTarget}_LINKER=${linkerForHost}" \
     '' + ''
       "CC_${stdenv.buildPlatform.rust.cargoEnvVarTarget}=${ccForBuild}" \
       "CXX_${stdenv.buildPlatform.rust.cargoEnvVarTarget}=${cxxForBuild}" \
-      "CARGO_TARGET_${stdenv.buildPlatform.rust.cargoEnvVarTarget}_LINKER=${ccForBuild}" \
+      "CARGO_TARGET_${stdenv.buildPlatform.rust.cargoEnvVarTarget}_LINKER=${linkerForBuild}" \
       "CARGO_BUILD_TARGET=${rustBuildPlatform}" \
       "HOST_CC=${buildPackages.stdenv.cc}/bin/cc" \
       "HOST_CXX=${buildPackages.stdenv.cc}/bin/c++" \