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!

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 { };

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
-      AR=$AR
+      CC=${stdenv.cc.targetPrefix}cc
+      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) ''

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
-  requiredSystemFeatures = [ "sys-devices" ];
+  # nOS-V requires access to /sys/devices to request NUMA information. It will
+  # 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
-  requiredSystemFeatures = [ "sys-devices" ];
+  # nOS-V requires access to /sys/devices to request NUMA information. It will
+  # 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
-  requiredSystemFeatures = [ "sys-devices" ];
+  # nOS-V requires access to /sys/devices to request NUMA information. It will
+  # 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
-  requiredSystemFeatures = [ "sys-devices" ];
-
+  # NODES requires access to /sys/devices to request NUMA information. It will
+  # fail to run otherwise, so we disable the sandbox for this test.
+  __noChroot = true;
   buildPhase = ''
     set -x
     #$CC -v