Some packages don’t work correctly with pie. Here I disable it for:
- busybox
- linux kernel
- kexectools
I also get rid of the Musl conditional for disabling pie in GCC and
Binutils. Some day we might want to enable PIE without Musl and it
will be useful to have the *just* work with our compiler and linkers.
Since commit f620b1b693, the build directory is located inside the
source directory. Thus, the `cp -dpR` copies gigabytes worth of .o files
only to be deleted later on when we trim all non-essential files from
`$dev/lib/modules/${modDirVersion}/source/` thus causing a significant
amount of wasted I/O and peak disk usage.
As `cp` doesn't come with a `--exclude` flag, use rsync. And throw out
the Documentation folder while at it.
Instead of using a string to describe kernel config, use a nix
attribute set, then converted to a string.
- allows to override the config, aka convert 'yes' into 'modules' or
vice-versa
- while for now merging different configs is still crude (last spec wins),
at least there should be only one CONFIG_XYZ value compared to the current string
config where the first defined would be used and others ignored.
[initial idea by copumpkin in 2016, a major rebase to 2018 by teto]
The required argument 'hostPlatform' was missing from linuxPackages_custom's
call to linuxManualConfig.
In order to prevent this in the future, this commit adds
linuxPackages_custom_tinyconfig_kernel so linuxPackages_custom gets tested.
This also adds linuxConfig, to derivate default linux configurations
via make defconfig, make tinyconfig, etc.
Closes#38034.
Signed-off-by: Austin Seipp <aseipp@pobox.com>
- defined buildLinux as generic.nix instead of manual-config.nix. This
makes kernel derivations a tad more similar to your typical derivations.
- moved $buildRoot to within the source folder, this way it doesn't have to be created before the unpackPhase
and make it easier to work on kernel source without running the unpackPhase
[...]
make modules -C /nix/store/h1vzl6bq4wif3m8dd1bw2p3fv4shjg3n-linux-4.14.9-dev/lib/modules/4.14.9/build EXTRA_CFLAGS=-Werror-implicit-function-declaration M=/tmp/nix-build-spl-kernel-2017-11-16-4.14.9.drv-0/source/build
/nix/store/h1vzl6bq4wif3m8dd1bw2p3fv4shjg3n-linux-4.14.9-dev/lib/modules/4.14.9/source/Makefile:939: *** "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel". Stop.
This patch introduces kernel.moduleBuildDependencies to avoid the logic "stdenv.lib.optional (stdenv.lib.versionAtLeast kernel.version "4.14") libelf" in multiple places.
[dezgeg did some minor tweaks on top]
For a while now, the only thing the 'uboot' attribute does is to tell
whether to add ubootTools to kernel/initrd builds. That can be
determined with platform.kernelTarget == "uImage" just as well.
Because if you get it wrong, you get a very confusing error message at
the end of the kernel build, which is quite painful as the build can
take a long time.
[dezgeg: note that we are currently using just 'Image' instead of
'Image.gz' as U-Boot doesn't support the latter yet. We might switch
once it does since the kernel images are quite big]
It takes some extra 13MB (and in dev, not out), but allows perf to show kernel
symbols when profiling. I think it is worth it.
In my NixOS, I refer to it in the system derivation, for easy telling to perf
through /run/booted-system/vmlinux:
system.extraSystemBuilderCmds = ''
ln -s ${config.boot.kernelPackages.kernel.dev}/vmlinux $out/vmlinux
'';
