Add SPEC CPU mini with a subset of benchmarks

pkgs/spec-cpu/mini.nix

@@ -0,0 +1,39 @@
+{
+  stdenv
+, spec-cpu
+}:
+
+stdenv.mkDerivation rec {
+  pname = "spec-cpu-mini";
+  version = spec-cpu.version;
+  src = null;
+  unpackPhase = "true";
+
+  # Select only a subset of the benchmarks:
+  # https://www.spec.org/cpu2017/Docs/#benchdocs
+  benchList = [
+    # -- SPECspeed 2017 Integer --
+    "600.perlbench_s"
+    "602.gcc_s"
+    "605.mcf_s"
+    "620.omnetpp_s"
+    #"623.xalancbmk_s" # Big
+    #"625.x264_s" # Big
+    "631.deepsjeng_s"
+    "641.leela_s"
+    "648.exchange2_s"
+    "657.xz_s"
+  ];
+
+  dontConfigure = true;
+  dontBuild = true;
+  installPhase = ''
+    mkdir -p $out/benchspec/CPU
+    for bench in $benchList; do
+      cp -a ${spec-cpu}/benchspec/CPU/$bench $out/benchspec/CPU/
+    done
+  '';
+  enableParallelBuilding = false;
+  hardeningDisable = [ "all" ];
+  dontStrip = true;
+}