From 4403d44763a1f8fb2bae6fd844406a47b99abf3b Mon Sep 17 00:00:00 2001
From: Adelbert Chang <Adelbert.Chang@target.com>
Date: Wed, 31 Jul 2019 05:19:01 -0700
Subject: [PATCH] buildRustPackage: fix cargo flag for release/debug build
 (#61521)

Previous behavior did not actually allow for "debug" build as it would
try to pass --debug to cargo, which is not a valid flag.
---
 pkgs/build-support/rust/default.nix | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/pkgs/build-support/rust/default.nix b/pkgs/build-support/rust/default.nix
index 306b70419ed1..6afe93c7e4c1 100644
--- a/pkgs/build-support/rust/default.nix
+++ b/pkgs/build-support/rust/default.nix
@@ -46,7 +46,6 @@ let
   ccForHost="${stdenv.cc}/bin/${stdenv.cc.targetPrefix}cc";
   cxxForHost="${stdenv.cc}/bin/${stdenv.cc.targetPrefix}c++";
   releaseDir = "target/${stdenv.hostPlatform.config}/${buildType}";
-
 in stdenv.mkDerivation (args // {
   inherit cargoDeps;
 
@@ -104,7 +103,7 @@ in stdenv.mkDerivation (args // {
       "CC_${stdenv.hostPlatform.config}"="${ccForHost}" \
       "CXX_${stdenv.hostPlatform.config}"="${cxxForHost}" \
       cargo build \
-        --${buildType} \
+        ${stdenv.lib.optionalString (buildType == "release") "--release"} \
         --target ${stdenv.hostPlatform.config} \
         --frozen ${concatStringsSep " " cargoBuildFlags}
     )