Fix nanos6 cross-compilation for riscv

Even if we do an override to papi get the proper configure flags for
cross-compiling, the memory fences are not defined for risc-v:

mb.h:67:2: error: #error Need to define rmb for this architecture!

.gitea/workflows/ci.yaml

@@ -12,9 +12,4 @@ jobs:
     runs-on: native
     steps:
       - uses: https://gitea.com/ScMi1/checkout@v1.4
-      - run: nix build -L --no-link --print-out-paths .#bsc.ci.all
+      - run: nix build -L --no-link --print-out-paths .#bsc-ci.all
-  build:cross:
-    runs-on: native
-    steps:
-      - uses: https://gitea.com/ScMi1/checkout@v1.4
-      - run: nix build -L --no-link --print-out-paths .#bsc.ci.cross

flake.lock

@@ -2,14 +2,12 @@
   "nodes": {
     "agenix": {
       "inputs": {
-        "darwin": [],
+        "darwin": "darwin",
-        "home-manager": [],
+        "home-manager": "home-manager",
         "nixpkgs": [
           "nixpkgs"
         ],
-        "systems": [
+        "systems": "systems"
-          "systems"
-        ]
       },
       "locked": {
         "lastModified": 1750173260,
@@ -25,6 +23,49 @@
         "type": "github"
       }
     },
+    "darwin": {
+      "inputs": {
+        "nixpkgs": [
+          "agenix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1744478979,
+        "narHash": "sha256-dyN+teG9G82G+m+PX/aSAagkC+vUv0SgUw3XkPhQodQ=",
+        "owner": "lnl7",
+        "repo": "nix-darwin",
+        "rev": "43975d782b418ebf4969e9ccba82466728c2851b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "lnl7",
+        "ref": "master",
+        "repo": "nix-darwin",
+        "type": "github"
+      }
+    },
+    "home-manager": {
+      "inputs": {
+        "nixpkgs": [
+          "agenix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1745494811,
+        "narHash": "sha256-YZCh2o9Ua1n9uCvrvi5pRxtuVNml8X2a03qIFfRKpFs=",
+        "owner": "nix-community",
+        "repo": "home-manager",
+        "rev": "abfad3d2958c9e6300a883bd443512c55dfeb1be",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "home-manager",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1752436162,
@@ -44,21 +85,23 @@
     "root": {
       "inputs": {
         "agenix": "agenix",
-        "nixpkgs": "nixpkgs",
+        "nixpkgs": "nixpkgs"
-        "systems": "systems"
       }
     },
     "systems": {
-      "flake": false,
       "locked": {
-        "path": "./pkgs/systems.nix",
+        "lastModified": 1681028828,
-        "type": "path"
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
       },
       "original": {
-        "path": "./pkgs/systems.nix",
+        "owner": "nix-systems",
-        "type": "path"
+        "repo": "default",
-      },
+        "type": "github"
-      "parent": []
+      }
     }
   },
   "root": "root",

flake.nix

@@ -1,15 +1,8 @@
 {
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
-
-    systems.url = "path:./pkgs/systems.nix";
-    systems.flake = false;
-
     agenix.url = "github:ryantm/agenix";
     agenix.inputs.nixpkgs.follows = "nixpkgs";
-    agenix.inputs.systems.follows = "systems";
-    agenix.inputs.darwin.follows = "";
-    agenix.inputs.home-manager.follows = "";
   };
 
   outputs = { self, nixpkgs, agenix, ... }:
@@ -49,7 +42,9 @@ in
     # full nixpkgs with our overlay applied
     legacyPackages.${system} = pkgs;
 
-    hydraJobs = self.legacyPackages.${system}.bsc.hydraJobs;
+    hydraJobs = {
+      inherit (self.legacyPackages.${system}.bsc-ci) tests pkgs cross;
+    };
 
     # propagate nixpkgs lib, so we can do bscpkgs.lib
     inherit (nixpkgs) lib;

m/common/base.nix

@@ -11,7 +11,6 @@
     ./base/hw.nix
     ./base/net.nix
     ./base/nix.nix
-    ./base/sys-devices.nix
     ./base/ntp.nix
     ./base/rev.nix
     ./base/ssh.nix

m/common/base/sys-devices.nix

@@ -1,9 +0,0 @@
-{
-  nix.settings.system-features = [ "sys-devices" ];
-
-  programs.nix-required-mounts.enable = true;
-  programs.nix-required-mounts.allowedPatterns.sys-devices.paths = [
-    "/sys/devices/system/cpu"
-    "/sys/devices/system/node"
-  ];
-}

overlay.nix

@@ -62,7 +62,7 @@ let
   };
 
   tests = rec {
-    hwloc = callPackage ./test/bugs/hwloc.nix { };
+    #hwloc = callPackage ./test/bugs/hwloc.nix { }; # Broken, no /sys
     #sigsegv = callPackage ./test/reproducers/sigsegv.nix { };
     hello-c = callPackage ./test/compilers/hello-c.nix { };
     hello-cpp = callPackage ./test/compilers/hello-cpp.nix { };
@@ -94,18 +94,12 @@ let
     };
   };
 
-  # For now, only build toplevel packages in CI/Hydra
+  pkgs = filterAttrs (_: isDerivation) bscPkgs;
-  pkgsTopLevel = filterAttrs (_: isDerivation) bscPkgs;
 
-  # Native build in that platform doesn't imply cross build works
+  crossTargets = [ "riscv64" ];
-  canCrossCompile = platform: pkg:
+  cross = prev.lib.genAttrs crossTargets (target:
-    (isDerivation pkg) &&
+    final.pkgsCross.${target}.bsc-ci.pkgs
-    # Must be defined explicitly
+  );
-    (pkg.meta.cross or false) &&
-    (meta.availableOn platform pkg);
-
-  # For now only RISC-V
-  crossSet = { riscv64 = final.pkgsCross.riscv64.bsc.pkgsTopLevel; };
 
   buildList = name: paths:
     final.runCommandLocal name { } ''
@@ -119,31 +113,22 @@ let
       printf '%s\n' $deps >$out
     '';
 
-  pkgsList = buildList "ci-pkgs" (builtins.attrValues pkgsTopLevel);
+  crossList = builtins.mapAttrs (t: v: buildList t (builtins.attrValues v)) cross;
-  testsList = buildList "ci-tests" (collect isDerivation tests);
+
-  allList = buildList' "ci-all" [ pkgsList testsList ];
+  pkgsList = buildList "ci-pkgs" (builtins.attrValues pkgs);
-  # For now only RISC-V
+  testList = buildList "ci-tests" (collect isDerivation tests);
-  crossList = buildList "ci-cross"
+
-    (filter
+  all = buildList' "ci-all" [ pkgsList testList ];
-      (canCrossCompile final.pkgsCross.riscv64.stdenv.hostPlatform)
-        (builtins.attrValues crossSet.riscv64));
 
 in bscPkgs // {
-  # Prevent accidental usage of bsc-ci attribute
+  # Prevent accidental usage of bsc attribute
-  bsc-ci = throw "the bsc-ci attribute is deprecated, use bsc.ci";
+  bsc = throw "the bsc attribute is deprecated, packages are now in the root";
 
   # Internal for our CI tests
-  bsc = {
+  bsc-ci = {
-    # CI targets for nix build
+    inherit pkgs pkgsList;
-    ci = { pkgs = pkgsList; tests = testsList; all = allList; cross = crossList; };
+    inherit tests testList;
-
+    inherit cross crossList;
-    # Direct access to package sets
+    inherit all;
-    tests = tests;
-    pkgs = bscPkgs;
-    pkgsTopLevel = pkgsTopLevel;
-    cross = crossSet;
-
-    # Hydra uses attribute sets of pkgs
-    hydraJobs = { tests = tests; pkgs = pkgsTopLevel; cross = crossSet; };
   };
 }

pkgs/lmbench/default.nix

@@ -22,7 +22,11 @@ stdenv.mkDerivation rec {
   '';
 
   buildInputs = [ libtirpc ];
-  patches = [ ./fix-install.patch ./gcc-14.patch ];
+  patches = [
+    ./fix-install.patch
+    ./gcc-14.patch
+    ./fix-cross.patch
+  ];
 
   hardeningDisable = [ "all" ];
 
@@ -35,8 +39,8 @@ stdenv.mkDerivation rec {
       CFLAGS=-Wno-implicit-int
       CPPFLAGS=-I${libtirpc.dev}/include/tirpc
       LDFLAGS=-ltirpc
-      CC=$CC
+      CC=${stdenv.cc.targetPrefix}cc
-      AR=$AR
+      AR=${stdenv.cc.targetPrefix}ar
     )
   '';
 

pkgs/lmbench/fix-cross.patch

@@ -0,0 +1,13 @@
+diff --git a/src/Makefile b/src/Makefile
+index 2555014..356eeb3 100644
+--- a/src/Makefile
++++ b/src/Makefile
+@@ -36,7 +36,7 @@ SHELL=/bin/sh
+ 
+ CC=`../scripts/compiler`
+ MAKE=`../scripts/make`
+-AR=ar
++AR?=ar
+ ARCREATE=cr
+ 
+ # base of installation location

pkgs/nanos6/default.nix

@@ -78,8 +78,6 @@ in
     ] ++
       (optional enableJemalloc "--with-jemalloc=${jemallocNanos6}") ++
       (optional enableGlibcxxDebug "CXXFLAGS=-D_GLIBCXX_DEBUG") ++
-      # Most nanos6 api symbols are resolved at runtime, so prefer
-      # ifunc by default
       (optional isCross "--with-symbol-resolution=ifunc");
 
     postConfigure = lib.optionalString (!enableDebug) ''

pkgs/ovni/default.nix

@@ -55,7 +55,4 @@ in
     doCheck = true;
     checkTarget = "test";
     hardeningDisable = [ "all" ];
-    meta = {
-      cross = true;
-    };
   }

pkgs/systems.nix

@@ -1,4 +0,0 @@
-# See https://github.com/nix-systems/nix-systems
-[
-  "x86_64-linux"
-]

test/bugs/hwloc.nix

@@ -6,7 +6,6 @@
 
 stdenv.mkDerivation {
   name = "hwloc-test";
-  requiredSystemFeatures = [ "sys-devices" ];
 
   src = ./.;
 
@@ -15,7 +14,7 @@ stdenv.mkDerivation {
   buildPhase = ''
     ls -l /sys
     gcc -lhwloc hwloc.c -o hwloc
-    strace ./hwloc > $out
+    strace ./hwloc
   '';
 
 }

test/compilers/clang-openmp-ld.nix

@@ -23,8 +23,9 @@ in stdenv.mkDerivation {
   dontUnpack = true;
   dontConfigure = true;
 
-  # nOS-V requires access to /sys/devices to request NUMA information
+  # nOS-V requires access to /sys/devices to request NUMA information. It will
-  requiredSystemFeatures = [ "sys-devices" ];
+  # fail to run otherwise, so we disable the sandbox for this test.
+  __noChroot = true;
 
   buildInputs = [ openmp ];
 

test/compilers/clang-openmp-nosv.nix

@@ -36,8 +36,9 @@ in stdenv.mkDerivation {
   dontUnpack = true;
   dontConfigure = true;
 
-  # nOS-V requires access to /sys/devices to request NUMA information
+  # nOS-V requires access to /sys/devices to request NUMA information. It will
-  requiredSystemFeatures = [ "sys-devices" ];
+  # fail to run otherwise, so we disable the sandbox for this test.
+  __noChroot = true;
 
   buildInputs = [ nosv ];
 

test/compilers/clang-openmp.nix

@@ -24,8 +24,9 @@ in stdenv.mkDerivation {
   dontUnpack = true;
   dontConfigure = true;
 
-  # nOS-V requires access to /sys/devices to request NUMA information
+  # nOS-V requires access to /sys/devices to request NUMA information. It will
-  requiredSystemFeatures = [ "sys-devices" ];
+  # fail to run otherwise, so we disable the sandbox for this test.
+  __noChroot = true;
 
   buildPhase = ''
     set -x

test/compilers/ompss2.nix

@@ -25,10 +25,9 @@ stdenv.mkDerivation rec {
   hardeningDisable = [ "all" ];
   #NIX_DEBUG = 1;
   buildInputs = [ ]; #strace gdb;
-
+  # NODES requires access to /sys/devices to request NUMA information. It will
-  # NODES requires access to /sys/devices to request NUMA information
+  # fail to run otherwise, so we disable the sandbox for this test.
-  requiredSystemFeatures = [ "sys-devices" ];
+  __noChroot = true;
-
   buildPhase = ''
     set -x
     #$CC -v