kernel: fix cross compilation

pkgs/os-specific/linux/kernel/common-config.nix

@@ -51,7 +51,7 @@ with stdenv.lib;
 
   # Bump the maximum number of CPUs to support systems like EC2 x1.*
   # instances and Xeon Phi.
-  ${optionalString (stdenv.system == "x86_64-linux" || stdenv.system == "aarch64-linux") ''
+  ${optionalString (stdenv.hostPlatform.system == "x86_64-linux" || stdenv.hostPlatform.system == "aarch64-linux") ''
     NR_CPUS 384
   ''}
 
@@ -347,11 +347,12 @@ with stdenv.lib;
   SECURITY_SELINUX_BOOTPARAM_VALUE 0 # Disable SELinux by default
   SECURITY_YAMA? y # Prevent processes from ptracing non-children processes
   DEVKMEM n # Disable /dev/kmem
-  ${if versionOlder version "3.14" then ''
-    CC_STACKPROTECTOR? y # Detect buffer overflows on the stack
-  '' else ''
-    CC_STACKPROTECTOR_REGULAR? y
-  ''}
+  ${optionalString (! stdenv.hostPlatform.isArm)
+    (if versionOlder version "3.14" then ''
+        CC_STACKPROTECTOR? y # Detect buffer overflows on the stack
+      '' else ''
+        CC_STACKPROTECTOR_REGULAR? y
+      '')}
   ${optionalString (versionAtLeast version "3.12") ''
     USER_NS y # Support for user namespaces
   ''}

pkgs/os-specific/linux/kernel/generic.nix

@@ -1,4 +1,4 @@
-{ stdenv, perl, buildLinux
+{ stdenv, buildPackages, perl, buildLinux
 
 , # The kernel source tarball.
   src
@@ -23,7 +23,8 @@
   # symbolic name and `patch' is the actual patch.  The patch may
   # optionally be compressed with gzip or bzip2.
   kernelPatches ? []
-, ignoreConfigErrors ? stdenv.platform.name != "pc"
+, ignoreConfigErrors ? hostPlatform.platform.name != "pc" ||
+                       hostPlatform != stdenv.buildPlatform
 , extraMeta ? {}
 , hostPlatform
 , ...
@@ -43,14 +44,12 @@ let
     netfilterRPFilter = true;
   } // features) kernelPatches;
 
-  configWithPlatform = kernelPlatform: import ./common-config.nix {
-    inherit stdenv version kernelPlatform extraConfig;
+  config = import ./common-config.nix {
+    inherit stdenv version extraConfig;
+    kernelPlatform = hostPlatform;
     features = kernelFeatures; # Ensure we know of all extra patches, etc.
   };
 
-  config = configWithPlatform stdenv.platform;
-  configCross = configWithPlatform hostPlatform.platform;
-
   kernelConfigFun = baseConfig:
     let
       configFromPatches =
@@ -65,31 +64,14 @@ let
 
     kernelConfig = kernelConfigFun config;
 
-    nativeBuildInputs = [ perl ];
-
-    platformName = stdenv.platform.name;
-    kernelBaseConfig = stdenv.platform.kernelBaseConfig;
-    kernelTarget = stdenv.platform.kernelTarget;
-    autoModules = stdenv.platform.kernelAutoModules;
-    preferBuiltin = stdenv.platform.kernelPreferBuiltin or false;
-    arch = stdenv.platform.kernelArch;
-
-    crossAttrs = let
-        cp = hostPlatform.platform;
-      in {
-        arch = cp.kernelArch;
-        platformName = cp.name;
-        kernelBaseConfig = cp.kernelBaseConfig;
-        kernelTarget = cp.kernelTarget;
-        autoModules = cp.kernelAutoModules;
+    nativeBuildInputs = [ buildPackages.stdenv.cc perl ];
 
-        # Just ignore all options that don't apply (We are lazy).
-        ignoreConfigErrors = true;
-
-        kernelConfig = kernelConfigFun configCross;
-
-        inherit (kernel.crossDrv) src patches preUnpack;
-      };
+    platformName = hostPlatform.platform.name;
+    kernelBaseConfig = hostPlatform.platform.kernelBaseConfig;
+    kernelTarget = hostPlatform.platform.kernelTarget;
+    autoModules = hostPlatform.platform.kernelAutoModules;
+    preferBuiltin = hostPlatform.platform.kernelPreferBuiltin or false;
+    arch = hostPlatform.platform.kernelArch;
 
     prePatch = kernel.prePatch + ''
       # Patch kconfig to print "###" after every question so that
@@ -103,7 +85,7 @@ let
       cd $buildRoot
 
       # Get a basic config file for later refinement with $generateConfig.
-      make -C ../$sourceRoot O=$PWD $kernelBaseConfig ARCH=$arch
+      make HOSTCC=${buildPackages.stdenv.cc.targetPrefix}gcc -C ../$sourceRoot O=$PWD $kernelBaseConfig ARCH=$arch
 
       # Create the config file.
       echo "generating kernel configuration..."
@@ -118,28 +100,14 @@ let
   };
 
   kernel = buildLinux {
-    inherit version modDirVersion src kernelPatches stdenv extraMeta;
-
-    configfile = configfile.nativeDrv or configfile;
-
-    crossConfigfile = configfile.crossDrv or configfile;
+    inherit version modDirVersion src kernelPatches stdenv extraMeta configfile;
 
     config = { CONFIG_MODULES = "y"; CONFIG_FW_LOADER = "m"; };
-
-    crossConfig = { CONFIG_MODULES = "y"; CONFIG_FW_LOADER = "m"; };
   };
 
   passthru = {
     features = kernelFeatures;
     passthru = kernel.passthru // (removeAttrs passthru [ "passthru" ]);
   };
 
-  addPassthru' = lib.extendDerivation true passthru;
-
-  nativeDrv = addPassthru' kernel.nativeDrv;
-
-  crossDrv = addPassthru' kernel.crossDrv;
-
-in if kernel ? crossDrv
-   then nativeDrv // { inherit nativeDrv crossDrv; }
-   else addPassthru' kernel
+in lib.extendDerivation true passthru kernel

pkgs/os-specific/linux/kernel/linux-4.13.nix

@@ -1,4 +1,4 @@
-{ stdenv, hostPlatform, fetchurl, perl, buildLinux, ... } @ args:
+{ stdenv, buildPackages, hostPlatform, fetchurl, perl, buildLinux, ... } @ args:
 
 import ./generic.nix (args // rec {
   version = "4.13.16";

pkgs/os-specific/linux/kernel/linux-4.14.nix

@@ -1,4 +1,4 @@
-{ stdenv, hostPlatform, fetchurl, perl, buildLinux, ... } @ args:
+{ stdenv, buildPackages, hostPlatform, fetchurl, perl, buildLinux, ... } @ args:
 
 with stdenv.lib;
 

pkgs/os-specific/linux/kernel/linux-4.4.nix

@@ -1,4 +1,4 @@
-{ stdenv, hostPlatform, fetchurl, perl, buildLinux, ... } @ args:
+{ stdenv, buildPackages, hostPlatform, fetchurl, perl, buildLinux, ... } @ args:
 
 import ./generic.nix (args // rec {
   version = "4.4.111";

pkgs/os-specific/linux/kernel/linux-4.9.nix

@@ -1,4 +1,4 @@
-{ stdenv, hostPlatform, fetchurl, perl, buildLinux, ... } @ args:
+{ stdenv, buildPackages, hostPlatform, fetchurl, perl, buildLinux, ... } @ args:
 
 import ./generic.nix (args // rec {
   version = "4.9.76";

pkgs/os-specific/linux/kernel/linux-beagleboard.nix

@@ -1,4 +1,4 @@
-{ stdenv, hostPlatform, fetchFromGitHub, perl, buildLinux, ... } @ args:
+{ stdenv, buildPackages, hostPlatform, fetchFromGitHub, perl, buildLinux, ... } @ args:
 
 let
   modDirVersion = "4.9.61";

pkgs/os-specific/linux/kernel/linux-hardened-copperhead.nix

@@ -1,4 +1,4 @@
-{ stdenv, hostPlatform, fetchFromGitHub, perl, buildLinux, ... } @ args:
+{ stdenv, buildPackages, hostPlatform, fetchFromGitHub, perl, buildLinux, ... } @ args:
 
 with stdenv.lib;
 

pkgs/os-specific/linux/kernel/linux-mptcp.nix

@@ -1,4 +1,4 @@
-{ stdenv, hostPlatform, fetchFromGitHub, perl, buildLinux, ... } @ args:
+{ stdenv, buildPackages, hostPlatform, fetchFromGitHub, perl, buildLinux, ... } @ args:
 
 import ./generic.nix (rec {
   mptcpVersion = "0.93";

pkgs/os-specific/linux/kernel/linux-rpi.nix

@@ -1,4 +1,4 @@
-{ stdenv, hostPlatform, fetchFromGitHub, perl, buildLinux, ... } @ args:
+{ stdenv, buildPackages, hostPlatform, fetchFromGitHub, perl, buildLinux, ... } @ args:
 
 let
   modDirVersion = "4.9.59";

pkgs/os-specific/linux/kernel/linux-samus-4.12.nix

@@ -1,4 +1,4 @@
-{ stdenv, hostPlatform, fetchFromGitHub, perl, buildLinux, ncurses, ... } @ args:
+{ stdenv, buildPackages, hostPlatform, fetchFromGitHub, perl, buildLinux, ncurses, ... } @ args:
 
 import ./generic.nix (args // rec {
   version = "4.12.2";

pkgs/os-specific/linux/kernel/linux-testing-bcachefs.nix

@@ -1,4 +1,4 @@
-{ stdenv, hostPlatform, fetchgit, perl, buildLinux, ... } @ args:
+{ stdenv, buildPackages, hostPlatform, fetchgit, perl, buildLinux, ... } @ args:
 
 import ./generic.nix (args // rec {
   version = "4.11.2017.08.23";

pkgs/os-specific/linux/kernel/linux-testing.nix

@@ -1,4 +1,4 @@
-{ stdenv, hostPlatform, fetchurl, perl, buildLinux, libelf, utillinux, ... } @ args:
+{ stdenv, buildPackages, hostPlatform, fetchurl, perl, buildLinux, libelf, utillinux, ... } @ args:
 
 import ./generic.nix (args // rec {
   version = "4.15-rc8";

pkgs/os-specific/linux/kernel/manual-config.nix

@@ -1,6 +1,6 @@
-{ runCommand, nettools, bc, perl, gmp, libmpc, mpfr, kmod, openssl
-, libelf ? null
-, utillinux ? null
+{ buildPackages, runCommand, nettools, bc, perl, gmp, libmpc, mpfr, openssl
+, libelf
+, utillinux
 , writeTextFile, ubootTools
 , hostPlatform
 }:
@@ -26,19 +26,11 @@ in {
   src,
   # Any patches
   kernelPatches ? [],
-  # Patches for native compiling only
-  nativeKernelPatches ? [],
-  # Patches for cross compiling only
-  crossKernelPatches ? [],
-  # The native kernel .config file
+  # The kernel .config file
   configfile,
-  # The cross kernel .config file
-  crossConfigfile ? configfile,
   # Manually specified nixexpr representing the config
   # If unspecified, this will be autodetected from the .config
   config ? stdenv.lib.optionalAttrs allowImportFromDerivation (readConfig configfile),
-  # Cross-compiling config
-  crossConfig ? if allowImportFromDerivation then (readConfig crossConfigfile) else config,
   # Use defaultMeta // extraMeta
   extraMeta ? {},
   # Whether to utilize the controversial import-from-derivation feature to parse the config
@@ -61,8 +53,8 @@ let
 
   commonMakeFlags = [
     "O=$(buildRoot)"
-  ] ++ stdenv.lib.optionals (stdenv.platform ? kernelMakeFlags)
-    stdenv.platform.kernelMakeFlags;
+  ] ++ stdenv.lib.optionals (hostPlatform.platform ? kernelMakeFlags)
+    hostPlatform.platform.kernelMakeFlags;
 
   drvAttrs = config_: platform: kernelPatches: configfile:
     let
@@ -105,7 +97,7 @@ let
             echo "stripping FHS paths in \`$mf'..."
             sed -i "$mf" -e 's|/usr/bin/||g ; s|/bin/||g ; s|/sbin/||g'
         done
-        sed -i Makefile -e 's|= depmod|= ${kmod}/bin/depmod|'
+        sed -i Makefile -e 's|= depmod|= ${buildPackages.kmod}/bin/depmod|'
       '';
 
       configurePhase = ''
@@ -211,7 +203,7 @@ let
         find -empty -type d -delete
 
         # Remove reference to kmod
-        sed -i Makefile -e 's|= ${kmod}/bin/depmod|= depmod|'
+        sed -i Makefile -e 's|= ${buildPackages.kmod}/bin/depmod|= depmod|'
       '' else optionalString installsFirmware ''
         make firmware_install $makeFlags "''${makeFlagsArray[@]}" \
           $installFlags "''${installFlagsArray[@]}"
@@ -239,34 +231,25 @@ in
 
 assert stdenv.lib.versionAtLeast version "4.14" -> libelf != null;
 assert stdenv.lib.versionAtLeast version "4.15" -> utillinux != null;
-stdenv.mkDerivation ((drvAttrs config stdenv.platform (kernelPatches ++ nativeKernelPatches) configfile) // {
+stdenv.mkDerivation ((drvAttrs config hostPlatform.platform kernelPatches configfile) // {
   name = "linux-${version}";
 
   enableParallelBuilding = true;
 
-  nativeBuildInputs = [ perl bc nettools openssl gmp libmpc mpfr ]
-      ++ optional (stdenv.platform.kernelTarget == "uImage") ubootTools
+  nativeBuildInputs = [ perl bc nettools openssl gmp libmpc mpfr buildPackages.stdenv.cc ]
+      ++ optional (stdenv.hostPlatform.platform.kernelTarget == "uImage") buildPackages.ubootTools
       ++ optional (stdenv.lib.versionAtLeast version "4.14") libelf
       ++ optional (stdenv.lib.versionAtLeast version "4.15") utillinux
       ;
 
   hardeningDisable = [ "bindnow" "format" "fortify" "stackprotector" "pic" ];
 
   makeFlags = commonMakeFlags ++ [
-    "ARCH=${stdenv.platform.kernelArch}"
+    "HOSTCC=${buildPackages.stdenv.cc.targetPrefix}gcc"
+    "ARCH=${stdenv.hostPlatform.platform.kernelArch}"
+  ] ++ stdenv.lib.optional (stdenv.hostPlatform != stdenv.buildPlatform) [
+    "CROSS_COMPILE=${stdenv.cc.targetPrefix}"
   ];
 
-  karch = stdenv.platform.kernelArch;
-
-  crossAttrs = let cp = hostPlatform.platform; in
-    (drvAttrs crossConfig cp (kernelPatches ++ crossKernelPatches) crossConfigfile) // {
-      makeFlags = commonMakeFlags ++ [
-        "ARCH=${cp.kernelArch}"
-        "CROSS_COMPILE=$(crossConfig)-"
-      ];
-
-      karch = cp.kernelArch;
-
-      nativeBuildInputs = optional (cp.kernelTarget == "uImage") ubootTools;
-  };
+  karch = hostPlatform.platform.kernelArch;
 })

pkgs/os-specific/linux/kernel/perf.nix

@@ -11,7 +11,7 @@ assert versionAtLeast kernel.version "3.12";
 stdenv.mkDerivation {
   name = "perf-linux-${kernel.version}";
 
-  inherit (kernel) src;
+  inherit (kernel) src makeFlags;
 
   preConfigure = ''
     cd tools/perf
@@ -23,8 +23,8 @@ stdenv.mkDerivation {
   # perf refers both to newt and slang
   # binutils is required for libbfd.
   nativeBuildInputs = [ asciidoc xmlto docbook_xsl docbook_xml_dtd_45 libxslt
-      flex bison libiberty libaudit makeWrapper pkgconfig ];
-  buildInputs = [ elfutils python perl newt slang libunwind binutils zlib ] ++
+      flex bison libiberty libaudit makeWrapper pkgconfig python perl ];
+  buildInputs = [ elfutils newt slang libunwind binutils zlib ] ++
     stdenv.lib.optional withGtk gtk2;
 
   # Note: we don't add elfutils to buildInputs, since it provides a
@@ -47,15 +47,6 @@ stdenv.mkDerivation {
       --prefix PATH : "${binutils}/bin"
   '';
 
-  crossAttrs = {
-    /* I don't want cross-python or cross-perl -
-       I don't know if cross-python even works */
-    propagatedBuildInputs = [ elfutils.crossDrv newt.crossDrv ];
-    makeFlags = "CROSS_COMPILE=${stdenv.cc.targetPrefix}";
-    elfutils = elfutils.crossDrv;
-    inherit (kernel.crossDrv) src patches;
-  };
-
   meta = {
     homepage = https://perf.wiki.kernel.org/;
     description = "Linux tools to profile with performance counters";