Commit graph

36 commits

Author SHA1 Message Date
John Ericson 359d00f8b0 top-level: system should still come from the host platform
2a6e4ae49a and
e51f736076 reverted a bit too much, and I
initially missed this when reviewing. The release notes already still
mention this change, too.
2018-09-23 13:24:44 -04:00
Sarah Brofeldt 2a6e4ae49a Revert "top-level: Deprecate top-level {build,host,target}Platform"
This reverts commit e51f736076.
2018-09-11 13:25:50 +02:00
John Ericson 773233ca77 top-level, stdenv: Make system and stdenv.system describe the hostPlatform.
Intuitively, one cares mainly about the host platform: Platforms differ
in meaningful ways but compilation is morally a pure process and
probably doesn't care, or those difference are already abstracted away.
@Dezgeg also empirically confirmed that > 95% of checks are indeed of
the host platform.

Yet these attributes in the old cross infrastructure were defined to be
the build platform, for expediency. And this was never before changed.
(For native builds build and host coincide, so it isn't clear what the
intention was.)

Fixing this doesn't affect native builds, since again they coincide. It
also doesn't affect cross builds of anything in Nixpkgs, as these are no
longer used. It could affect external cross builds, but I deem that
unlikely as anyone thinking about cross would use more explicit
attributes for clarity, all the more so because the rarity of inspecting
the build platform.
2018-09-06 08:33:51 -04:00
John Ericson e51f736076 top-level: Deprecate top-level {build,host,target}Platform
I don't know when we can/should remove them, but this at least gets
people to stop using them. The preferred alternatives also date back to
17.09 so writing forward-compatable code without extra conditions is
easy.

Beginning with these as they are the least controversial.
2018-09-05 11:53:51 -04:00
John Ericson 7d85ade0cc treewide: Purge stdenv.platform and top-level platform
Progress towards #27069
2018-08-20 15:22:46 -04:00
volth 101df126bb config.skipAliases -> config.allowAliases 2018-07-17 14:46:21 +00:00
Matthew Bauer ad20a4a1c3 stage: add Linux checks
This prevent us evaluation on macOS systems where pkgsMusl &
pkgsi686Linux is unsupported.
2018-07-05 17:32:54 -04:00
John Ericson f795ed79d0 stage: Make pkgsMusl and pkgsi686linux respect the original localSystem more
For example:

nix-repl> pkgsi686Linux.pkgsMusl.hostPlatform.config
"i686-unknown-linux-musl"

nix-repl> pkgsMusl.pkgsi686Linux.hostPlatform.config
"i686-unknown-linux-musl"
2018-07-05 16:17:54 -04:00
Matthew Bauer 69f1045001 treewide: remove forceSystem 2018-07-05 15:47:10 -04:00
Matthew Bauer c491a99362 treewide: remove callPackage_i686
This has been replaced with pkgsi686Linux.callPackage
2018-07-05 14:04:52 -04:00
Matthew Bauer 5b357d9037 stage: refactor extraPkgs
I have renamed the overlay to “otherPackageSets” because I think that
is more descriptive.

pkgsLocal has been removed because there were concerns that it would
be confusing. None of the other names seemed very useful so I think it
is best to avoid it altogether. pkgsCross is still included,
hopefully, that will not have as much confusion.

pkgsMusl is now available for building Musl packages. It will give you
packages bulit with the Musl libc.

Also added more documentation.

/cc @dezgeg @Ericson2314 @dtzWill
2018-07-05 13:59:03 -04:00
Matthew Bauer 18af089de7 stage: remove nixpkgsFun
also inherit forceSystem for some GNU Hurd stuff
2018-07-02 11:20:34 -04:00
Matthew Bauer d1bd9faf61 stage: move old stuff to stage.nix 2018-07-02 11:07:53 -04:00
Matthew Bauer b6b1950594 top-level: add extraPkgs to stage.nix 2018-07-02 11:07:53 -04:00
Matthew Bauer d665e80450 top-level: move cross pkgs to overlay 2018-07-02 11:07:53 -04:00
Will Fancher 9555fd700d aliases: fix using the wrong self refs 2018-06-12 18:05:42 +00:00
Matthew Bauer ffe4b64205 aliases: add skip aliases config
You can turn on this config option if you want to find references to
aliases in Nixpkgs. Ideally these can be removed from Nixpkgs and
eventually we can remove the alias altogether.
2018-05-01 13:54:08 -05:00
Tyson Whitehead fefa9ef756 top-level: Duplicate overlaying unless stdenvOverrides comes last
The stdenvOverrides overlay is used to bring packages forward during
bootstrapping via stdenv.overrides.  These packages have already had
the overlays applied to them in the previous boostrapping stage.  If
stdenvOverrides is not last in the overlays stack, all remaining
overlays will windup being applied again to these packages.

closes #34086
2018-01-31 00:16:27 -05:00
John Ericson 5ae8f18f4d Rename __targetPackages to targetPackages 2017-11-05 17:10:53 -05:00
John Ericson a302d7360f top-level: {build,host,target}Platform are defined in the stdenv instead
See #27069 for a discussion of this
2017-07-07 12:55:02 -04:00
hsloan 9f156f4a8a top-level: stdenv.cross vanquished 2017-06-28 21:29:08 -04:00
John Ericson a7d89139ea top-level: stdenv.cross is now only defined with host != build
In practice, this is a strictly stronger condition than target != build
as we never have build = target != host. Really, the attribute should
be removed altogether, but for now we make it work for plain libraries,
which do not care about the target platform. In the few cases where the
compilers use this and actually care about the target platform, I'll
manually change them to use `targetPlatform` instead.
2017-04-24 16:12:26 -04:00
John Ericson 863d79b364 top-level: Introduce targetPackages and a "double link fold"
Each bootstrapping stage ought to just depend on the previous stage, but
poorly-written compilers break this elegence. This provides an easy-enough
way to depend on the next stage: targetPackages. PLEASE DO NOT USE IT
UNLESS YOU MUST!

I'm hoping someday in a pleasant future I can revert this commit :)
2017-04-23 14:01:12 -04:00
John Ericson d59e4fbb75 stage.nix: Better explain why buildPackages as null is valid arg 2017-04-23 14:01:12 -04:00
John Ericson bfb147b6a8 top-level: Only splice as needed for performance 2017-01-24 11:37:56 -05:00
John Ericson a1a798f017 top-level: crossSystem is no longer exposed to packages. Use *Platform. 2017-01-24 11:37:56 -05:00
John Ericson 92edcb7ebb top-level: Lay the groundwork for {build,host,target}Platform
The long term goal is a big replace:
  { inherit system platform; } => buildPlatform
  crossSystem => hostPlatform
  stdenv.cross => targetPlatform
And additionally making sure each is defined even when not cross compiling.

This commit refactors the bootstrapping code along that vision, but leaves
the old identifiers with their null semantics in place so packages can be
modernized incrementally.
2017-01-24 11:37:56 -05:00
John Ericson bf17d6dacf top-level: Introduce buildPackages for resolving build-time deps
[N.B., this package also applies to the commits that follow it in the same
PR.]

In most cases, buildPackages = pkgs so things work just as before. For
cross compiling, however, buildPackages is resolved as the previous
bootstrapping stage. This allows us to avoid the mkDerivation hacks cross
compiling currently uses today.

To avoid a massive refactor, callPackage will splice together both package
sets. Again to avoid churn, it uses the old `nativeDrv` vs `crossDrv` to do
so. So now, whether cross compiling or not, packages with get a `nativeDrv`
and `crossDrv`---in the non-cross-compiling case they are simply the same
derivation. This is good because it reduces the divergence between the
cross and non-cross dataflow. See `pkgs/top-level/splice.nix` for a comment
along the lines of the preceding paragraph, and the code that does this
splicing.

Also, `forceNativeDrv` is replaced with `forceNativePackages`. The latter
resolves `pkgs` unless the host platform is different from the build
platform, in which case it resolves to `buildPackages`. Note that the
target platform is not important here---it will not prevent
`forcedNativePackages` from resolving to `pkgs`.

--------

Temporarily, we make preserve some dubious decisions in the name of preserving
hashes:

Most importantly, we don't distinguish between "host" and "target" in the
autoconf sense. This leads to the proliferation of *Cross derivations
currently used. What we ought to is resolve native deps of the cross "build
packages" (build = host != target) package set against the "vanilla
packages" (build = host = target) package set. Instead, "build packages"
uses itself, with (informally) target != build in all cases.

This is wrong because it violates the "sliding window" principle of
bootstrapping stages that shifting the platform triple of one stage to the
left coincides with the next stage's platform triple. Only because we don't
explicitly distinguish between "host" and "target" does it appear that the
"sliding window" principle is preserved--indeed it is over the reductionary
"platform double" of just "build" and "host/target".

Additionally, we build libc, libgcc, etc in the same stage as the compilers
themselves, which is wrong because they are used at runtime, not build
time. Fixing this is somewhat subtle, and the solution and problem will be
better explained in the commit that does fix it.

Commits after this will solve both these issues, at the expense of breaking
cross hashes. Native hashes won't be broken, thankfully.

--------

Did the temporary ugliness pan out? Of the packages that currently build in
`release-cross.nix`, the only ones that have their hash changed are
`*.gcc.crossDrv` and `bootstrapTools.*.coreutilsMinimal`. In both cases I
think it doesn't matter.

 1. GCC when doing a `build = host = target = foreign` build (maximally
    cross), still defines environment variables like `CPATH`[1] with
    packages.  This seems assuredly wrong because whether gcc dynamically
    links those, or the programs built by gcc dynamically link those---I
    have no idea which case is reality---they should be foreign. Therefore,
    in all likelihood, I just made the gcc less broken.

 2. Coreutils (ab)used the old cross-compiling infrastructure to depend on
    a native version of itself. When coreutils was overwritten to be built
    with fewer features, the native version it used would also be
    overwritten because the binding was tight. Now it uses the much looser
    `BuildPackages.coreutils` which is just fine as a richer build dep
    doesn't cause any problems and avoids a rebuild.

So, in conclusion I'd say the conservatism payed off. Onward to actually
raking the muck in the next PR!

[1]: https://gcc.gnu.org/onlinedocs/gcc/Environment-Variables.html
2017-01-24 11:37:56 -05:00
Nicolas B. Pierron f5dfe78a1e Add overlays mechanism to Nixpkgs.
This patch add a new argument to Nixpkgs default expression named "overlays".

By default, the value of the argument is either taken from the environment variable `NIXPKGS_OVERLAYS`,
or from the directory `~/.nixpkgs/overlays/`.  If the environment variable does not name a valid directory
then this mechanism would fallback on the home directory.  If the home directory does not exists it will
fallback on an empty list of overlays.

The overlays directory should contain the list of extra Nixpkgs stages which would be used to extend the
content of Nixpkgs, with additional set of packages.  The overlays, i-e directory, files, symbolic links
are used in alphabetical order.

The simplest overlay which extends Nixpkgs with nothing looks like:

```nix
self: super: {
}
```

More refined overlays can use `super` as the basis for building new packages, and `self` as a way to query
the final result of the fix-point.

An example of overlay which extends Nixpkgs with a small set of packages can be found at:
  https://github.com/nbp/nixpkgs-mozilla/blob/nixpkgs-overlay/moz-overlay.nix

To use this file, checkout the repository and add a symbolic link to
the `moz-overlay.nix` file in `~/.nixpkgs/overlays` directory.
2017-01-16 01:17:33 +01:00
John Ericson 67ebd3161b top-level: Inherit system and platform in stage.nix not all-packages.nix
These are not packages, and so its more elegant to do this outside of
all-packages.nix.
2017-01-13 13:23:25 -05:00
David Grayson 0f33b9f7f1 top-level: Do stdenvOverrides in stage.nix even if crossSystem exists.
Instead, the cross stdenv will patch up the override field -- the complexity
is now confined to the one place it matters.
2017-01-13 13:23:25 -05:00
John Ericson 3e197f7d81 top-level: Normalize stdenv booting
Introduce new abstraction, `stdenv/booter.nix` for composing bootstraping
stages, and use it everywhere for consistency. See that file for more doc.

Stdenvs besides Linux and Darwin are completely refactored to utilize this.
Those two, due to their size and complexity, are minimally edited for
easier reviewing.

No hashes should be changed.
2017-01-13 13:23:23 -05:00
John Ericson 0ef8b69d12 top-level: Modernize stdenv.overrides giving it self and super
Document breaking change in 17.03 release notes
2017-01-13 10:36:11 -05:00
John Ericson 4751d9e5ad top-level: turn the screw
- Non-cross stdenvs are honest and assert that `crossSystem` is null

 - `crossSystem` is a mandatory argument to top-level/stage.nix, just like
   `system` and `platform`

 - Broken default arguments on stdenvs for testing are gone.

 - All stdenvs (but little-used stdenvNix) take the same arguments for easy
   testing.
2016-12-01 11:24:33 -05:00
John Ericson d240a0da1a top-level: Remove cycles: stdenv calls in top-level but not vice versa
This commit changes the dependencies of stdenv, and clean-up the stdenv
story by removing the `defaultStdenv` attribute as well as the `bootStdenv`
parameter.

Before, the final bootstrapping stage's stdenv was provided by
all-packages, which was iterating multiple times over the
top-level/default.nix expression, and non-final bootstrapping stages'
stdenvs were explicitly specified with the `bootStdenv` parameter.

Now, all stages' stdenvs are specified with the `stdenv` parameter.
For non-final bootstrapping stages, this is a small change---basically just
rename the parameter.
For the final stage, top-level/default.nix takes the chosen stdenv and
makes the final stage with it.

`allPackages` is used to make all bootstrapping stages, final and
non-final alike. It's basically the expression of `stage.nix` (along with a
few partially-applied default arguments)

Note, the make-bootstrap-tools scripts are temporarily broken
2016-11-30 19:10:59 -05:00
John Ericson 07a2b17cbf top-level: Split some of pkgs/top-level/default.nix to pkgs/top-level/stage.nix
This is preparation for the latter just building a single stage, and the
former building a package set with the bootstrapped stdenv.
2016-11-30 19:04:22 -05:00