Merge pull request from lovesegfault/kernel-extra-build-flags

linux: groundwork to enable LLVM/LTO builds
This commit is contained in:
Bernardo Meurer 2021-07-15 22:14:59 -07:00 committed by GitHub
commit 91ffffd904
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3 changed files with 26 additions and 13 deletions

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@ -19,6 +19,7 @@ my $autoModules = $ENV{'AUTO_MODULES'};
my $preferBuiltin = $ENV{'PREFER_BUILTIN'};
my $ignoreConfigErrors = $ENV{'ignoreConfigErrors'};
my $buildRoot = $ENV{'BUILD_ROOT'};
my $makeFlags = $ENV{'MAKE_FLAGS'};
$SIG{PIPE} = 'IGNORE';
# Read the answers.
@ -40,7 +41,7 @@ close ANSWERS;
sub runConfig {
# Run `make config'.
my $pid = open2(\*IN, \*OUT, "make -C $ENV{SRC} O=$buildRoot config SHELL=bash ARCH=$ENV{ARCH} CC=$ENV{CC} HOSTCC=$ENV{HOSTCC} HOSTCXX=$ENV{HOSTCXX}");
my $pid = open2(\*IN, \*OUT, "make -C $ENV{SRC} O=$buildRoot config SHELL=bash ARCH=$ENV{ARCH} CC=$ENV{CC} HOSTCC=$ENV{HOSTCC} HOSTCXX=$ENV{HOSTCXX} $makeFlags");
# Parse the output, look for questions and then send an
# appropriate answer.

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@ -21,6 +21,9 @@
, # Legacy overrides to the intermediate kernel config, as string
extraConfig ? ""
# Additional make flags passed to kbuild
, extraMakeFlags ? []
, # kernel intermediate config overrides, as a set
structuredExtraConfig ? {}
@ -97,7 +100,7 @@ let
in lib.concatStringsSep "\n" ([baseConfigStr] ++ configFromPatches);
configfile = stdenv.mkDerivation {
inherit ignoreConfigErrors autoModules preferBuiltin kernelArch;
inherit ignoreConfigErrors autoModules preferBuiltin kernelArch extraMakeFlags;
pname = "linux-config";
inherit version;
@ -116,6 +119,9 @@ let
# e.g. "bzImage"
kernelTarget = stdenv.hostPlatform.linux-kernel.target;
makeFlags = lib.optionals (stdenv.hostPlatform.linux-kernel ? makeFlags) stdenv.hostPlatform.linux-kernel.makeFlags
++ extraMakeFlags;
prePatch = kernel.prePatch + ''
# Patch kconfig to print "###" after every question so that
# generate-config.pl from the generic builder can answer them.
@ -134,16 +140,19 @@ let
export HOSTLD=$LD_FOR_BUILD
# Get a basic config file for later refinement with $generateConfig.
make -C . O="$buildRoot" $kernelBaseConfig \
make $makeFlags \
-C . O="$buildRoot" $kernelBaseConfig \
ARCH=$kernelArch \
HOSTCC=$HOSTCC HOSTCXX=$HOSTCXX HOSTAR=$HOSTAR HOSTLD=$HOSTLD \
CC=$CC OBJCOPY=$OBJCOPY OBJDUMP=$OBJDUMP READELF=$READELF
CC=$CC OBJCOPY=$OBJCOPY OBJDUMP=$OBJDUMP READELF=$READELF \
$makeFlags
# Create the config file.
echo "generating kernel configuration..."
ln -s "$kernelConfigPath" "$buildRoot/kernel-config"
DEBUG=1 ARCH=$kernelArch KERNEL_CONFIG="$buildRoot/kernel-config" AUTO_MODULES=$autoModules \
PREFER_BUILTIN=$preferBuiltin BUILD_ROOT="$buildRoot" SRC=. perl -w $generateConfig
PREFER_BUILTIN=$preferBuiltin BUILD_ROOT="$buildRoot" SRC=. MAKE_FLAGS="$makeFlags" \
perl -w $generateConfig
'';
installPhase = "mv $buildRoot/.config $out";
@ -151,7 +160,6 @@ let
enableParallelBuilding = true;
passthru = rec {
module = import ../../../../nixos/modules/system/boot/kernel_config.nix;
# used also in apache
# { modules = [ { options = res.options; config = svc.config or svc; } ];
@ -172,14 +180,14 @@ let
}; # end of configfile derivation
kernel = (callPackage ./manual-config.nix {}) {
inherit version modDirVersion src kernelPatches randstructSeed lib stdenv extraMeta configfile;
inherit version modDirVersion src kernelPatches randstructSeed lib stdenv extraMakeFlags extraMeta configfile;
config = { CONFIG_MODULES = "y"; CONFIG_FW_LOADER = "m"; };
};
passthru = {
features = kernelFeatures;
inherit commonStructuredConfig isZen isHardened isLibre modDirVersion;
inherit commonStructuredConfig structuredExtraConfig extraMakeFlags isZen isHardened isLibre modDirVersion;
isXen = lib.warn "The isXen attribute is deprecated. All Nixpkgs kernels that support it now have Xen enabled." true;
kernelOlder = lib.versionOlder version;
kernelAtLeast = lib.versionAtLeast version;

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@ -1,5 +1,5 @@
{ lib, buildPackages, runCommand, nettools, bc, bison, flex, perl, rsync, gmp, libmpc, mpfr, openssl
, libelf, cpio, elfutils, zstd, gawk
, libelf, cpio, elfutils, zstd, gawk, python3Minimal
, writeTextFile
}:
@ -19,6 +19,8 @@ in {
stdenv,
# The kernel version
version,
# Additional kernel make flags
extraMakeFlags ? [],
# The version of the kernel module directory
modDirVersion ? version,
# The kernel source (tarball, git checkout, etc.)
@ -121,7 +123,7 @@ let
# See also https://kernelnewbies.org/BuildId
sed -i Makefile -e 's|--build-id=[^ ]*|--build-id=none|'
patchShebangs scripts/ld-version.sh
patchShebangs scripts
'';
postPatch = ''
@ -173,7 +175,9 @@ let
"KBUILD_BUILD_VERSION=1-NixOS"
kernelConf.target
"vmlinux" # for "perf" and things like that
] ++ optional isModular "modules";
]
++ optional isModular "modules"
++ extraMakeFlags;
installFlags = [
"INSTALLKERNEL=${installkernel}"
@ -307,7 +311,7 @@ stdenv.mkDerivation ((drvAttrs config stdenv.hostPlatform.linux-kernel kernelPat
enableParallelBuilding = true;
depsBuildBuild = [ buildPackages.stdenv.cc ];
nativeBuildInputs = [ perl bc nettools openssl rsync gmp libmpc mpfr gawk zstd ]
nativeBuildInputs = [ perl bc nettools openssl rsync gmp libmpc mpfr gawk zstd python3Minimal ]
++ optional (stdenv.hostPlatform.linux-kernel.target == "uImage") buildPackages.ubootTools
++ optional (lib.versionAtLeast version "4.14" && lib.versionOlder version "5.8") libelf
# Removed util-linuxMinimal since it should not be a dependency.
@ -325,7 +329,7 @@ stdenv.mkDerivation ((drvAttrs config stdenv.hostPlatform.linux-kernel kernelPat
"ARCH=${stdenv.hostPlatform.linuxArch}"
] ++ lib.optional (stdenv.hostPlatform != stdenv.buildPlatform) [
"CROSS_COMPILE=${stdenv.cc.targetPrefix}"
];
] ++ extraMakeFlags;
karch = stdenv.hostPlatform.linuxArch;
})