5f57c2e0f9
This commit adds a derivation `gcc-stageCompare` to `pkgs/test/stdenv/default.nix`. It is important to always build this derivation whenever building `stdenv`! Because we are using a Nix-driven bootstrap instead of gcc's built-in `--enable-bootstrap`, the `gcc` derivation no longer performs the post-self-compilation sanity check. You must build this derivation in order to perform that sanity check. The major benefit of this new approach is that the sanity check (which involves a third compilation of gcc) can be performed *concurrently* with all packages that depend on `stdenv`, rather than serially. Since `stdenv` has very little derivation-level parallelism it cannot take advantage of more than one or perhaps two builders. If you have three or more builders this commit will reduce the time-to-rebuild-stdenv by around 20% (one of three gcc rebuilds is removed from the critical path, and stdenv's build time is dominated by roughly 3*gcc + 1*binutils + 1*bison-test-suite). Co-authored-by: Sandro <sandro.jaeckel@gmail.com>
33 lines
1.1 KiB
Nix
33 lines
1.1 KiB
Nix
# This test *must* be run prior to releasing any build of either stdenv or the
|
|
# gcc that it exports! This check should also be part of CI for any PR that
|
|
# causes a rebuild of `stdenv.cc`.
|
|
#
|
|
# When we used gcc's internal bootstrap it did this check as part of (and
|
|
# serially with) the gcc derivation. Now that we bootstrap externally this
|
|
# check can be done in parallel with any/all of stdenv's referrers. But we
|
|
# must remember to do the check.
|
|
#
|
|
|
|
{ stdenv
|
|
, pkgs
|
|
, lib
|
|
}:
|
|
|
|
assert stdenv.cc.isGNU;
|
|
with pkgs;
|
|
# rebuild gcc using the "final" stdenv
|
|
let gcc-stageCompare = (gcc-unwrapped.override {
|
|
reproducibleBuild = true;
|
|
profiledCompiler = false;
|
|
stdenv = overrideCC stdenv (wrapCCWith {
|
|
cc = stdenv.cc;
|
|
});
|
|
}).overrideAttrs(_: {
|
|
NIX_OUTPATH_USED_AS_RANDOM_SEED = stdenv.cc.cc.out;
|
|
});
|
|
in (runCommand "gcc-stageCompare" {} ''
|
|
diff -sr ${pkgs.gcc-unwrapped.checksum}/checksums ${gcc-stageCompare.checksum}/checksums && touch $out
|
|
'').overrideAttrs (a: {
|
|
meta = (a.meta or { }) // { platforms = lib.platforms.linux; };
|
|
})
|