Without these, Nix fails on 32-bit Linux with Perl 5.14, with a
rather unhelpful error message:
Not a CODE reference at /nix/store/n6kpbacn6nn7i3i735v8j3di8aqyl07v-perl-5.14.2/lib/perl5/5.14.2/i686-linux-thread-multi/DynaLoader.pm
This is likely because the lack of -D_FILE_OFFSET_BITS=64 causes
various Perl structures to not match what the Perl interpreter
expects.
environment of the given derivation in a format that can be sourced
by the shell, e.g.
$ eval "$(nix-store --print-env $(nix-instantiate /etc/nixos/nixpkgs -A pkg))"
$ NIX_BUILD_TOP=/tmp
$ source $stdenv/setup
This is especially useful to reproduce the environment used to build
a package outside of its builder for development purposes.
TODO: add a nix-build option to do the above and fetch the
dependencies of the derivation as well.
scripts.
* Include the version and architecture in the -I flag so that there is
at least a chance that a Nix binary built for one Perl version will
run on another version.
^/nix/branches/multiple-outputs-sandbox). Multiple output support
still isn't complete, but it wasn't complete in the trunk either, so
it doesn't hurt.
‘drvAttrs’. This will simplify the implementation of functions such
as ‘overrideDerivation’ in Nixpkgs, which need to filter out any
added attributes such as outPath.
common attribution so that they're evaluated only once, etc. Note
that the default output is now the first element of the "outputs"
attribute, rather than the first element of the sorted list of
outputs. This seems more user-friendly.
other simplifications.
* Use <nix/...> to locate the corepkgs. This allows them to be
overriden through $NIX_PATH.
* Use bash's pipefail option in the NAR builder so that we don't need
to create a temporary file.
unreachable paths. This matters when using --max-freed etc.:
unreachable paths could become reachable again, so it's nicer to
keep them if there is "real" garbage to be deleted. Also, don't use
readDirectory() but read the Nix store and delete invalid paths in
parallel. This reduces GC latency on very large Nix stores.
closure to a given machine at the same time. This prevents the case
where multiple instances try to copy the same missing store path to
the target machine, which is very wasteful.
Eelco Dolstra
Ludovic Courtès