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cross compilation: simplify emulateBuilderQemu & use linux-megous as kernel when available

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Colin 2023-08-11 21:32:14 +00:00
parent 98463ddeb4
commit 52d8321066
1 changed files with 51 additions and 48 deletions
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99
overlays/cross.nix
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@ -67,55 +67,57 @@ let
}; };
emulated = mkEmulated final prev; emulated = mkEmulated final prev;
linuxMinimal = final.linux.override { # linuxMinimal = final.linux.override {
# customize stock linux to compile using less RAM # # customize stock linux to compile using less RAM
# default config is in: # # default config is in:
# - <pkgs/os-specific/linux/kernel/common-config.nix> # # - <pkgs/os-specific/linux/kernel/common-config.nix>
structuredExtraConfig = with lib.kernel; { # structuredExtraConfig = with lib.kernel; {
# recommended by: <https://nixos.wiki/wiki/Linux_kernel#Too_high_ram_usage> # # recommended by: <https://nixos.wiki/wiki/Linux_kernel#Too_high_ram_usage>
DEBUG_INFO_BTF = lib.mkForce no; # DEBUG_INFO_BTF = lib.mkForce no;
# other debug-related things i can probably disable # # other debug-related things i can probably disable
CC_OPTIMIZE_FOR_SIZE = lib.mkForce yes; # CC_OPTIMIZE_FOR_SIZE = lib.mkForce yes;
DEBUG_INFO = lib.mkForce no; # DEBUG_INFO = lib.mkForce no;
DEBUG_KERNEL = lib.mkForce no; # DEBUG_KERNEL = lib.mkForce no;
GDB_SCRIPTS = lib.mkForce no; # GDB_SCRIPTS = lib.mkForce no;
SCHED_DEBUG = lib.mkForce no; # SCHED_DEBUG = lib.mkForce no;
SUNRPC_DEBUG = lib.mkForce no; # SUNRPC_DEBUG = lib.mkForce no;
# disable un-needed features # # disable un-needed features
BT = no; # BT = no;
CAN = no; # CAN = no;
DRM = no; # uses a lot of space when compiling # DRM = no; # uses a lot of space when compiling
FPGA = no; # FPGA = no;
GNSS = no; # GNSS = no;
IIO = no; # 500 MB # IIO = no; # 500 MB
INPUT_TOUCHSCREEN = no; # INPUT_TOUCHSCREEN = no;
MEDIA_SDR_SUPPORT = no; # MEDIA_SDR_SUPPORT = no;
NFC = no; # NFC = no;
SND = no; # also uses a lot of disk space when compiling # SND = no; # also uses a lot of disk space when compiling
SOUND = no; # SOUND = no;
WWAN = no; # 1.4 GB (drivers/net/wireless) # # WWAN = no; # 1.4 GB (drivers/net/wireless) (but WWAN=no doesn't actually disable that?)
# we could try disabling these, but i wonder if anything relies on them (e.g. autoconf) # # we could try disabling these, but i wonder if anything relies on them (e.g. autoconf)
# FONTS = lib.mkForce no; # # FONTS = lib.mkForce no;
# FB = lib.mkForce no; # # FB = lib.mkForce no;
# WAN = lib.mkForce no; # # WAN = lib.mkForce no;
# INET = no; # # INET = no;
# MEMTEST = lib.mkForce no; # # MEMTEST = lib.mkForce no;
# # NET = lib.mkForce no; # we need net (9pnet_virtio; unix) for sharing fs with the build machine # # # NET = lib.mkForce no; # we need net (9pnet_virtio; unix) for sharing fs with the build machine
MEDIA_ANALOG_TV_SUPPORT = lib.mkForce no; # MEDIA_ANALOG_TV_SUPPORT = lib.mkForce no;
MEDIA_CAMERA_SUPPORT = lib.mkForce no; # MEDIA_CAMERA_SUPPORT = lib.mkForce no;
MEDIA_DIGITAL_TV_SUPPORT = lib.mkForce no; # 150 MB disk space when compiling # MEDIA_DIGITAL_TV_SUPPORT = lib.mkForce no; # 150 MB disk space when compiling
MICROCODE = lib.mkForce no; # MICROCODE = lib.mkForce no;
STAGING = lib.mkForce no; # 450 MB disk space when compiling # STAGING = lib.mkForce no; # 450 MB disk space when compiling
};
}; # RTC_DRV_CMOS = yes; # something in the above config changes disabled this...
# };
# };
# given a package that's defined for build == host, # given a package that's defined for build == host,
# build it from the native build machine by emulating the builder. # build it from the native build machine by emulating the builder.
emulateBuilderQemu = pkg: let emulateBuilderQemu = pkg: let
vmTools = final.buildPackages.vmTools.override { vmTools = final.vmTools.override {
kernel = linuxMinimal; kernel = final.linux-megous or final.linux; #< HACK: guess at whatever deployed linux we're using, to avoid building two kernels
}; };
# fix up the nixpkgs command that runs a Linux OS inside QEMU: # fix up the nixpkgs command that runs a Linux OS inside QEMU:
# qemu_kvm doesn't support x86_64 -> aarch64; but full qemu package does. # qemu_kvm doesn't support x86_64 -> aarch64; but full qemu package does.
@ -123,15 +125,16 @@ let
[ "${final.buildPackages.qemu_kvm}" ] [ "${final.buildPackages.qemu_kvm}" ]
[ "${final.buildPackages.qemu}" ] [ "${final.buildPackages.qemu}" ]
vmTools.qemuCommandLinux; vmTools.qemuCommandLinux;
vmRunCommand = final.buildPackages.vmTools.vmRunCommand qemuCommandLinux;
in in
# without binfmt emulation, leverage the `vmTools.runInLinuxVM` infrastructure: # without binfmt emulation, leverage the `vmTools.runInLinuxVM` infrastructure:
# final.vmTools.runInLinuxVM pkg # final.buildPackages.vmTools.runInLinuxVM pkg
# #
# except `runInLinuxVM` doesn't seem to support cross compilation (what's its purpose, then?) # except `runInLinuxVM` doesn't quite work OOTB (see above),
# so hack its components into something which *does* handle cross compilation # so hack its components into something which *does* work.
lib.overrideDerivation pkg ({ builder, args, ... }: { lib.overrideDerivation pkg ({ builder, args, ... }: {
builder = "${final.buildPackages.bash}/bin/sh"; builder = "${final.buildPackages.bash}/bin/sh";
args = [ "-e" (vmTools.vmRunCommand qemuCommandLinux) ]; args = [ "-e" vmRunCommand ];
# orig{Builder,Args} gets used by the vmRunCommand script: # orig{Builder,Args} gets used by the vmRunCommand script:
origBuilder = builder; origBuilder = builder;
origArgs = args; origArgs = args;
@ -253,7 +256,7 @@ let
buildInProot = pkg: emulateBuilderProot (buildOnHost pkg); buildInProot = pkg: emulateBuilderProot (buildOnHost pkg);
buildInBinfmt = pkg: emulateBuilderBinfmt (buildOnHost pkg); buildInBinfmt = pkg: emulateBuilderBinfmt (buildOnHost pkg);
in { in {
inherit emulated linuxMinimal; inherit emulated;
# pkgsi686Linux = prev.pkgsi686Linux.extend (i686Self: i686Super: { # pkgsi686Linux = prev.pkgsi686Linux.extend (i686Self: i686Super: {
# # fixes eval-time error: "Unsupported cross architecture" # # fixes eval-time error: "Unsupported cross architecture"