disable verbose warning

Author: mazunki

chainloader.nix

@@ -6,6 +6,7 @@
     (import ./overlay.nix {
       inherit withCcache;
       smp = false; # No SMP for chainloader
+      disableTargetWarning = true;
     })
   ],
   pkgs ? import nixpkgs {
@@ -47,5 +48,5 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [
     pkgs.buildPackages.cmake
     pkgs.buildPackages.nasm
-  ];
+  ] ++ [ pkgs.pkgsIncludeOS.suppressTargetWarningHook ];
 }

default.nix

@@ -2,7 +2,7 @@
   smp ? false, # Enable multcore support (SMP)
   nixpkgs ? ./pinned.nix,
   overlays ? [
-    (import ./overlay.nix { inherit withCcache; inherit smp; } )
+    (import ./overlay.nix { inherit withCcache; inherit smp; disableTargetWarning = true; } )
   ],
   pkgs ? import nixpkgs { config = {}; inherit overlays; }
 }:

example.nix

@@ -13,7 +13,7 @@ includeos.stdenv.mkDerivation rec {
   nativeBuildInputs = [
     includeos.pkgs.buildPackages.nasm
     includeos.pkgs.buildPackages.cmake
-  ];
+  ] ++ [ includeos.pkgs.pkgsIncludeOS.suppressTargetWarningHook ];
 
   buildInputs = [
     includeos

overlay.nix

@@ -1,5 +1,6 @@
 {
   withCcache, # Enable ccache. Requires correct permissions, see below.
+  disableTargetWarning ? true, # TODO: see https://github.com/NixOS/nixpkgs/issues/395191
   smp,      # Enable multicore support (SMP)
 } :
 final: prev: {
@@ -69,9 +70,21 @@ final: prev: {
           echo "====="
         '';
       };
+
+      suppressTargetWarningHook = prev.writeTextFile {
+        name = "suppress-target-warning-hook";
+        destination = "/nix-support/setup-hook";
+        text = ''
+          # see https://github.com/NixOS/nixpkgs/issues/395191
+          # delete this hook and downstream references once resolved
+
+          export NIX_CC_WRAPPER_SUPPRESS_TARGET_WARNING=1
+        '';
+      };
     in {
     # self.callPackage will use this stdenv.
     stdenv = final.stdenvIncludeOS.includeos_stdenv;
+    inherit suppressTargetWarningHook;
 
     # Deps
     uzlib = self.callPackage ./deps/uzlib/default.nix { };
@@ -140,7 +153,8 @@ final: prev: {
       nativeBuildInputs = [
         prev.buildPackages.cmake
         prev.buildPackages.nasm
-      ] ++ prev.lib.optionals withCcache [self.ccacheWrapper ccacheNoticeHook];
+      ] ++ prev.lib.optionals disableTargetWarning [suppressTargetWarningHook]
+        ++ prev.lib.optionals withCcache [self.ccacheWrapper ccacheNoticeHook];
 
       buildInputs = [
         self.botan2

shell.nix

@@ -63,6 +63,11 @@ includeos.pkgs.mkShell.override { inherit (includeos) stdenv; } rec {
         mkdir -p "$BUILDPATH"
         pushd "$BUILDPATH"
     fi
+
+    # see https://github.com/NixOS/nixpkgs/issues/395191
+    # delete this export once resolved
+    export NIX_CC_WRAPPER_SUPPRESS_TARGET_WARNING=1
+
     cmake "$unikernel" -DARCH=x86_64 -DINCLUDEOS_PACKAGE=${includeos} -DCMAKE_MODULE_PATH=${includeos}/cmake \
                      -DFOR_PRODUCTION=OFF
     make -j $NIX_BUILD_CORES