In addition to the use-case mentioned inside the function's
documentation comment, I am motivated to add this function for two
reasons:
- My actual use-case is adding a guaranteed phase to every
`stdenv.mkDerivation` via a nixpkgs overlay. Exposing this generic
function allows me to do that, without having to replicate
`defaultMkDerivationFromStdenv`. This relieves that maintainence
burden for that overlay implementation, since that function has to be
kept in sync with `stdenv/generic`.
- I see value in adding this generic function over a specialized
function. At first, I had a different implementation in mind, and
tried to make due with the specialized functions that were already
exposed. Having access to this generic function allowed me to
experiment, and settle on a better implementation.
This commit is based off of @SomeoneSerge's PR [1].
[1] https://github.com/NixOS/nixpkgs/pull/350350
Co-authored-by: SomeoneSerge <else+aalto@someonex.net>
This should not depend on whether __structuredAttrs is enabled;
it belongs in env regardless.
Warn if the flag already exists in the wrong place
(which should not be the case in current nixpkgs).
pkgsStatic injects { NIX_CFLAGS_COMPILE = " -static"; }. When
__structuredAttrs is true, it must inject { env.NIX_CFLAGS_COMPILE = "
-static"; } instead, as attributes outside env are ignored.
These are the flags we use in the separateDebugInfo hook, plus
disabling optimisations in line with what we do for C.
This fixes e.g. enableDebugging amberol.
After #400734 we can make useMoldLinker work when cross compiling.
We need the following:
- Need to use pkgs.buildPackages.mold so that we use mold binaries
for the build machine instead of the host.
- Need to create unprefixed ld.mold wrapper because gcc will not look
for a triple-prefixed ld.mold when passing -fuse-ld=mold.
Tested on an aarch64 machine with this change + #400734:
$ nix-build -K --expr 'with import "${./.}" { crossSystem = { config = "x86_64-unknown-linux-gnu"; }; }; hello.override { stdenv = useMoldLinker stdenv; }' && strings result/bin/hello | grep mold
/nix/store/w1yg0am7iyqsgi253h84lsp92178sgfi-hello-x86_64-unknown-linux-gnu-2.12.1
mold 2.37.1 (compatible with GNU ld)
Format all Nix files using the officially approved formatter,
making the CI check introduced in the previous commit succeed:
nix-build ci -A fmt.check
This is the next step of the of the [implementation](https://github.com/NixOS/nixfmt/issues/153)
of the accepted [RFC 166](https://github.com/NixOS/rfcs/pull/166).
This commit will lead to merge conflicts for a number of PRs,
up to an estimated ~1100 (~33%) among the PRs with activity in the past 2
months, but that should be lower than what it would be without the previous
[partial treewide format](https://github.com/NixOS/nixpkgs/pull/322537).
Merge conflicts caused by this commit can now automatically be resolved while rebasing using the
[auto-rebase script](8616af08d9/maintainers/scripts/auto-rebase).
If you run into any problems regarding any of this, please reach out to the
[formatting team](https://nixos.org/community/teams/formatting/) by
pinging @NixOS/nix-formatting.
Change the adapter to add the requested SDK to the target’s build
inputs. Note that only the “11.0” (i.e., 11.3) and 12.3 SDKs are
supported. This adapter is retained for compatibility. The preferred way
to override the SDK is to add it to the appropriate inputs directly.
`${stdenv.cc.libc}/lib/libSystem.B.dylib` does not exist and not existed
for as long as I have used nixpkgs. Since `/usr/lib/libSystem.B.dylib`
is already linked via text-based stubs, continue relying on those.
I realized what rhelmot did in 61202561d9
(specify what packages just need `stdenvNoLibc`) is definitely the right
approach for this, and adjusted NetBSD and OpenBSD to likewise use it.
With that change, we don't need these confusing and ugly `*bsdCross`
package sets at all!
We can get rid of a lot more libc-related `*Cross`, and I will do so
soon, but this is the first step.
(adapted from commit 51f1ecaa59)
For a long time, we've had `crossLibcStdenv`, `*Cross` libc attributes,
and `*bsdCross` pre-libc package sets. This was always bad because
having "cross" things is "not declarative": the naming doesn't reflect
what packages *need* but rather how we *provide* something. This is
ugly, and creates needless friction between cross and native building.
Now, almost all of these `*Cross` attributes are gone: just these are
kept:
- Glibc's and Musl's are kept, because those packages are widely used
and I didn't want to risk changing the native builds of those at this
time.
- generic `libcCross`, `theadsCross`, and friends, because these relate
to the convolulted GCC bootstrap which still needs to be redone.
The BSD and obscure Linux or freestnanding libcs have conversely all
been made to use a new `stdenvNoLibc`, which is like the old
`crossLibcStdenv` except:
1. It usable for native and cross alike
2. It named according to what it *is* ("a standard environment without
libc but with a C compiler"), rather than some non-compositional
jargon ("the stdenv used for building libc when cross compiling",
yuck).
I should have done this change long ago, but I was stymied because of
"infinite recursions". The problem was that in too many cases we are
overriding `stdenv` to *remove* things we don't need, and this risks
cyles since those more minimal stdenvs are used to build things in the
more maximal stdenvs.
The solution is to pass `stage.nix` `stdenvNoCC`, so we can override to
*build up* rather than *tear down*. For now, the full `stdenv` is also
passed, so I don't need to change the native bootstraps, but I can see
this changing as we make things more uniform and clean those up.
Finally, the BSDs also had to be cleaned up, since they have a few
pre-libc dependencies, demanding a systematic approach. I realized what
rhelmot did in 61202561d9 (specify what
packages just need `stdenvNoLibc`) is definitely the right approach for
this, and adjusted NetBSD and OpenBSD to likewise use it.
This is effectively a rewrite of `overrideSDK`. It was required because
`wrapGAppsHook` propagates `depsTargetTarget` with the expectation that
it will effectively be `buildInputs` when the hook is itself used as a
`nativeBuildInput`. This propagates Gtk, which itself propagates the
default Dariwn SDK, making it effectively impossible to override the SDK
when a package depends on Gtk and uses `wrapGAppsHook`.
This rewrite implements the following improvements:
* Cross-compilation should be supported correctly (untested);
* Supports public and private frameworks;
* Supports SDK `libs`;
* Remaps instead of replacing extra (native) build inputs in the stdenv;
* Updates any Darwin framework references in `nix-support`; and
* It updates `xcodebuild` regardless of which input its in.
The implementation avoids recursion for performance reasons. Instead, it
enumerates transitive dependencies and walks the list from the leaf
packages backwards to the parent packages.
`finalAttrs` is never the first argument. This should have been
called `prevAttrs` all along.
It confused me for a bit, because the callback _must not_ be strict
in `finalAttrs` (the first of _two_ parameters), or it will
recurse infinitely while trying to figure out what the attrNames are.
- merge libcxxabi into libcxx for LLVM 12, 13, 14, 15, 16, 17, and git.
- remove the link time workaround `-lc++ -lc++abi` from 58 packages as it is no longer required.
- fixes https://github.com/NixOS/nixpkgs/issues/166205
- provides alternative fixes for. https://github.com/NixOS/nixpkgs/issues/269548https://github.com/NixOS/nix/issues/9640
- pkgsCross.x86_64-freebsd builds work again
This change can be represented in 3 stages
1. merge libcxxabi into libcxx -- files: pkgs/development/compilers/llvm/[12, git]/{libcxx, libcxxabi}
2. update stdenv to account for merge -- files: stdenv.{adapters, cc.wrapper, darwin}
3. remove all references to libcxxabi outside of llvm (about 58 packages modified)
### merging libcxxabi into libcxx
- take the union of the libcxxabi and libcxx cmake flags
- eliminate the libcxx-headers-only package - it was only needed to break libcxx <-> libcxxabi circular dependency
- libcxx.cxxabi is removed. external cxxabi (freebsd) will symlink headers / libs into libcxx.
- darwin will re-export the libcxxabi symbols into libcxx so linking `-lc++` is sufficient.
- linux/freebsd `libc++.so` is a linker script `LINK(libc++.so.1, -lc++abi)` making `-lc++` sufficient.
- libcxx/default.nix [12, 17] are identical except for patches and `LIBCXX_ADDITIONAL_LIBRARIES` (only used in 16+)
- git/libcxx/defaul.nix does not link with -nostdlib when useLLVM is true so flag is removed. this is not much different than before as libcxxabi used -nostdlib where libcxx did not, so libc was linked in anyway.
### stdenv changes
- darwin bootstrap, remove references to libcxxabi and cxxabi
- cc-wrapper: remove c++ link workaround when libcxx.cxxabi doesn't exist (still exists for LLVM pre 12)
- adapter: update overrideLibcxx to account for a pkgs.stdenv that only has libcxx
### 58 package updates
- remove `NIX_LDFLAGS = "-l${stdenv.cc.libcxx.cxxabi.libName}` as no longer needed
- swift, nodejs_v8 remove libcxxabi references in the clang override
https://github.com/NixOS/nixpkgs/pull/292043
Before the change `pkgsLLVM` attributes were failing to pull in
`compiler-rt` on `x86_64-linux`:
$ nix build --no-link -f. pkgsLLVM.asciidoc-full
error:
error: attribute 'llvmPackages_13' missing
at pkgs/stdenv/adapters.nix:86:32:
85| inherit libcxx;
86| extraPackages = [ cxxabi pkgs.pkgsTargetTarget."llvmPackages_${lib.versions.major llvmLibcxxVersion}".compiler-rt ];
| ^
87| });
It happens because `pkgs.pkgsTargetTarget` are always empty for
cross-packages like `pkgsLLVM.`, `pkgsCross.*.` or
`--arg crossSystem '...'`.
The 10.12 Libsystem is not located as a sub-attribute of
`darwin.apple_sdk_10_12`. This will be fixed as part of the SDK changes
planned for post-23.11. In the meantime, special case it so the adapter
can be used to change the deployment target.
This was taken from #264091 to use in the interim before that PR lands
(sometime after the release of 23.11). It allows different versions of
clang to link the same libc++, allowing dependencies to be linked when
they are built with a different version of clang than the stdenv.
