responsie file logic

pkgs/build-support/cc-wrapper/cc-wrapper.sh

@@ -180,7 +180,18 @@ fi
 
 PATH="$path_backup"
 # Old bash workaround, see above.
-exec @prog@ \
-    ${extraBefore+"${extraBefore[@]}"} \
-    ${params+"${params[@]}"} \
-    ${extraAfter+"${extraAfter[@]}"}
+
+if (( "${NIX_CC_USE_RESPONSE_FILE:-@use_response_file_by_default@}" >= 1 )); then
+    RESPONSE_FILE=$(mktemp)
+    printf "%q\n" \
+       ${extraBefore+"${extraBefore[@]}"} \
+       ${params+"${params[@]}"} \
+       ${extraAfter+"${extraAfter[@]}"} \
+       > "${RESPONSE_FILE}"
+    exec @prog@ "@${RESPONSE_FILE}"
+else
+    exec @prog@ \
+       ${extraBefore+"${extraBefore[@]}"} \
+       ${params+"${params[@]}"} \
+       ${extraAfter+"${extraAfter[@]}"}
+fi

pkgs/build-support/cc-wrapper/default.nix

@@ -121,6 +121,7 @@ stdenv.mkDerivation {
         local dst="$1"
         local wrapper="$2"
         export prog="$3"
+        export use_response_file_by_default=${if isClang then "1" else "0"}
         substituteAll "$wrapper" "$out/bin/$dst"
         chmod +x "$out/bin/$dst"
       }

pkgs/build-support/expand-response-params/default.nix

@@ -10,7 +10,7 @@ stdenv.mkDerivation {
     src=$PWD
   '';
   buildPhase = ''
-    "$CC" -std=c99 -O3 -o "expand-response-params" expand-response-params.c
+    NIX_CC_USE_RESPONSE_FILE=0 "$CC" -std=c99 -O3 -o "expand-response-params" expand-response-params.c
   '';
   installPhase = ''
     mkdir -p $prefix/bin