This function is fundamentally broken.
Not even the ncurses example will compile.
The interface needs to be rethought for it to work (i.e. don't
unconditionally include all pc files, set include path and ld path and
rpath).
Since it is unlikely that in the current this has any user, just drop it for now.
Fixes https://github.com/dhall-lang/dhall-haskell/issues/2267
`pkgs.dhallToNix` currently fails when a Dhall package is
interpolated into the input source code, like this:
```nix
let
pkgs = import <nixpkgs> { };
f = { buildDhallPackage }: buildDhallPackage {
name = "not";
code = "λ(x : Bool) → x == False";
source = true;
};
not = pkgs.dhallPackages.callPackage f {};
in
pkgs.dhallToNix "${not}/source.dhall True"
```
This is because `dhallToNix` was using `builtins.toFile`, which
does not permit inputs with interpolated derivations. However,
`pkgs.writeText` does not have this limitation, so we can switch
to using that instead.
Apparently, a non-existent nsswitch.conf causes a very misleading host
resolution, differing from the defaults people are used to.
According to
https://github.com/golang/go/issues/22846#issuecomment-346377144, glibc
says the default is "dns [!UNAVAIL=return] files".
This means, `/etc/hosts` isn't really honored, causing all sorts of
unexpected behaviour.
Let's prevent this, and first ask `/etc/hosts` before querying DNS, like
we do on NixOS too.
The reason for this change is explained in the long comment I added.
Here's a simple example of the problem:
let
pkgs = import <nixpkgs> { crossSystem.system = "aarch64-linux"; };
in
pkgs.callPackage ({ stdenv, s6-rc }: stdenv.mkDerivation {
name = "s6-rc-compiled";
nativeBuildInputs = [ s6-rc ];
buildCommand = ''
mkdir in
s6-rc-compile $out in
'';
}) {}
We're cross compiling for aarch64 here, so we'd expect the scripts
generated by this derivation to be things we could run on aarch64.
But when I build this on my x86_64 machine, without this change
applied, $out/servicedirs/s6rc-oneshot-runner/run gets generated full
of references to x86_64 non-cross store paths for execline, s6, and
s6-rc.
With this change applied, the scripts generated by the above
expression now refer to the cross-compiled aarch64 store paths for
execline, s6, and s6-rc.
- Reuse build phase from the `buildDunePackage` function.
- Only install the package that was just built (useful for monorepo support).
- Introduces `opam-name` to override the default package name to build with Dune.
