Replace stdenv with stdenvNoCC to optimize CI workflows

test/Makefile

@@ -157,6 +157,17 @@ nix_gc:
 	@nix-collect-garbage -d
 	@nix-store --optimise
 
+# This target is used to accelerate CI workflows, e.g., `benchmark_x86` and `benchmark_x86_tdx`.
+initramfs_pkgs:
+	@nix-build \
+		nix/default.nix \
+		--tarball-ttl $(NIXPKGS_CACHE_TTL) \
+		$(NIX_QUIET) \
+		--argstr target x86_64 \
+		--arg enableBenchmark true \
+		--out-link /nix/var/nix/gcroots/auto/x86_64-initramfs-with-benchmark \
+		-A initramfs-image
+
 $(EXT2_IMAGE):
 	@mkdir -p $(BUILD_DIR)
 	@dd if=/dev/zero of=$(EXT2_IMAGE) bs=2G count=1

test/nix/benchmark/default.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, callPackage, hostPlatform, pkgsHostTarget, }: rec {
+{ lib, stdenvNoCC, callPackage, hostPlatform, pkgsHostTarget, }: rec {
   # Use `--esx` flag to enable `CONFIG_NO_SHM` and disable `CONFIG_HAVE_TIMERFD_CREATE`.
   fio = pkgsHostTarget.fio.overrideAttrs (_: { configureFlags = [ "--esx" ]; });
   hackbench = callPackage ./hackbench.nix { };
@@ -14,7 +14,7 @@
   sqlite-speedtest1 = callPackage ./sqlite-speedtest1.nix { };
   sysbench = if hostPlatform.isx86_64 then pkgsHostTarget.sysbench else null;
 
-  package = stdenv.mkDerivation {
+  package = stdenvNoCC.mkDerivation {
     pname = "benchmark";
     version = "0.1.0";
     src = lib.fileset.toSource {

test/nix/initramfs-image.nix

@@ -1,5 +1,5 @@
-{ stdenv, pkgsBuildBuild, initramfs, compressed, }:
-stdenv.mkDerivation {
+{ stdenvNoCC, pkgsBuildBuild, initramfs, compressed, }:
+stdenvNoCC.mkDerivation {
   name = "initramfs-image";
   nativeBuildInputs = with pkgsBuildBuild; [ cpio gzip ];
   buildCommand = ''

test/nix/initramfs.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitHub, hostPlatform, writeClosure, busybox, apps
+{ lib, stdenvNoCC, fetchFromGitHub, hostPlatform, writeClosure, busybox, apps
 , linux_vdso, benchmark, syscall, }:
 let
   etc = lib.fileset.toSource {
@@ -13,7 +13,7 @@ let
     ++ lib.optionals (apps != null) [ apps.package ]
     ++ lib.optionals (benchmark != null) [ benchmark.package ]
     ++ lib.optionals (syscall != null) [ syscall.package ];
-in stdenv.mkDerivation {
+in stdenvNoCC.mkDerivation {
   name = "initramfs";
   buildCommand = ''
     mkdir -p $out/{dev,etc,root,usr,opt,tmp,var,proc,sys}

test/nix/syscall/default.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, callPackage, testSuite ? "ltp", workDir ? "/tmp", smp ? 1,
+{ lib, stdenvNoCC, callPackage, testSuite ? "ltp", workDir ? "/tmp", smp ? 1,
 }: rec {
   inherit testSuite;
   ltp = callPackage ./ltp.nix { };
@@ -8,7 +8,7 @@
     path = builtins.getEnv "GVISOR_PREBUILT_DIR";
   };
 
-  package = stdenv.mkDerivation {
+  package = stdenvNoCC.mkDerivation {
     pname = "syscall_test";
     version = "0.1.0";
     src = lib.fileset.toSource {

tools/docker/nix/Dockerfile

@@ -36,6 +36,12 @@ RUN make general_pkgs VERBOSE=0 \
     && make install_host_pkgs \
     && make nix_gc
 
+# Build initramfs packages to accelerate CI workflows
+#
+# It could also cache `stdenvNoCC`, a fundamental and predefined build environment.
+# Therefore, `make nix_gc` MUST NOT be run after this.
+RUN make initramfs_pkgs VERBOSE=0
+
 # Clean source files
 RUN rm -rf /root/test