Hi,
good that you figured all out yourself. Just comments.
On Sat Mar 25, 2017 at 00:12:31 +0100, Mateusz Czaplinski wrote:
Hm; tried adding the following line:
hardeningDisable = [ "stackprotector" "pic" ];
per https://github.com/NixOS/nixpkgs/issues/18895 and https://github.com/NixOS/nixpkgs/issues/18995. This now seems to get me through the bootstrap.elf linking phase! But it fails soon afterwards on bootstrap32.elf :-( with:
ld: skipping incompatible /nix/store/...-gcc-5.4.0/lib/gcc/x86_64-unknown-linux-gnu/5.4.0/libgcc.a when searching for -lgcc ld: cannot find -lgcc
Can I skip building bootstrap32.elf somehow? Or should I not?
For booting, you'll need a bit of 32bit code, thus the multilib parts are indeed required.
Do I even have to build l4, or do I only need fiasco for l4linux? (fiasco seems to build OK with the initial hardeningDisable = [ "all" ]; I tried.) Or none at all, just the sources?
You need to build l4 for L4Linux as L4Linux also requires L4Re.
Adam
On Fri, Mar 24, 2017 at 10:06 PM, Mateusz Czaplinski czapkofan@gmail.com wrote:
I'm trying to build L4 on NixOS in a VM (long term goal: try to learn how to replace NixOS's kernel with L4Linux, then maybe Genode). I'm getting an error like below:
undefined reference to `__stack_chk_fail'
during linking of bootstrap.elf - in a GCC's error-barf just after:
[bootstrap] ==> Linking bootstrap.elf
I've put up the precise Nix expression/script I'm using to build it on github - at: https://github.com/akavel/l4.nix/blob/0108dfcf8d84780e1ba884c41ece0d 2dbf4ddd84/l4re.nix but what it generally boils down to is a sequence of commands like this:
$ wget http://os.inf.tu-dresden.de/download/snapshots/l4re-core- 2016082114.tar.xz $ tar xf l4re-core-2016082114 <(201)%20608-2114>.tar.xz $ cd l4re-core-2016082114 <(201)%20608-2114> $ mkdir out $ cp src/l4/mk/defconfig/config.amd64 out/l4/.kconfig $ make -C src/l4 O=out/l4 olddefconfig $ make -C out/l4
I've tried various additional changes, based on some snippets found here and there on teh Internets, like:
- adding V=0 to the last make (no idea what it does yet, just some cargo
culting)
- adding NIX_CFLAGS_COMPILE = "-fno-stack-protector"; to the Nix
expression/script (also not really sure where it applies in the stack); but none of the above helped.
Any idea what I could try doing to push it further?
Thanks, /Mateusz.