| 6 Nov 2024 |
 frontear | is there any documentation (of really any kind) in regards to the inner working on how stdenv works? I find it a little bit difficult to follow the many multiple levels of nix code in nixpkgs, and was wondering if any kind of documentation exists, such as how the process works especially for cross environments | 23:03:17 |
 Artturin | In reply to @frontear:matrix.org
is there any documentation (of really any kind) in regards to the inner working on how stdenv works? I find it a little bit difficult to follow the many multiple levels of nix code in nixpkgs, and was wondering if any kind of documentation exists, such as how the process works especially for cross environments The cross part is easy because you do not have to deal with bootstrapping | 23:04:09 |
| Artturin | Here's some crumbs I sent to someone before
nix build -vvvvvvvv ".#stdenv" gives a good overview by listing which files are evaluated first
'default.nix'
'pkgs/top-level/impure.nix'
'pkgs/top-level/default.nix'
'pkgs/stdenv/booter.nix'
'pkgs/stdenv/default.nix'
'pkgs/top-level/config.nix'
'pkgs/stdenv/linux/default.nix'
'pkgs/stdenv/linux/bootstrap-tools/default.nix'
'pkgs/stdenv/linux/bootstrap-tools/glibc.nix'
'pkgs/top-level/stage.nix'
'pkgs/stdenv/adapters.nix'
'pkgs/build-support/trivial-builders/default.nix'
'pkgs/top-level/splice.nix'
'pkgs/top-level/by-name-overlay.nix'
'pkgs/top-level/all-packages.nix'
'pkgs/top-level/aliases.nix'
'pkgs/stdenv/generic/default.nix'
'pkgs/build-support/bintools-wrapper/default.nix'
'pkgs/stdenv/generic/make-derivation.nix'
'pkgs/development/tools/misc/binutils/default.nix'
'pkgs/servers/x11/xorg/default.nix'
'pkgs/servers/x11/xorg/overrides.nix'
'pkgs/build-support/cc-wrapper/default.nix'
'pkgs/stdenv/generic/check-meta.nix'
(edited the lib files out)
(xorg is there because of https://github.com/NixOS/nixpkgs/blob/0d2ff894cb4d1bcb1b5006aa68c8cc87051b7741/pkgs/top-level/splice.nix#L125)
https://github.com/NixOS/nixpkgs/blob/0d2ff894cb4d1bcb1b5006aa68c8cc87051b7741/pkgs/top-level/stage.nix#L308-L316
| 23:05:53 |
| Artturin |
I sent to someone
Literally SomeoneSerge (utc+3)
| 23:06:43 |
| Artturin | haha | 23:06:48 |
| frontear | appreciated looks like need to write down some notes as i read these thank you | 23:10:18 |
| Artturin | https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/linux/default.nix | 23:11:19 |
| Artturin | vs cross https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/cross/default.nix | 23:11:31 |
| Artturin | 699 lines vs 107 | 23:11:41 |
| frontear | honestly i expected the complete opposite | 23:12:00 |
| frontear | id expected cross setup to be more difficult | 23:12:11 |
| Artturin | The hard work of bootstrapping is done in the native stages | 23:12:37 |
| Artturin | So cross is mostly just compiling packages like normal | 23:13:28 |
| 7 Nov 2024 |
 @trofi:matrix.org | Yeah. It still needs to build cross-gcc twice (and arguably does it slightly incorrectly WRT libgcc.so), but it's not as involved as native tools are already there (and use native bootstrap). | 16:56:46 |
| 8 Nov 2024 |
|  moved to @amadaluzia:tchncs.de changed their display name from (artur 'manuel) to moved to @amadaluzia:tchncs.de. | 14:29:49 |
| 9 Nov 2024 |
 emily | is doing stdenv.override { whateverPlatform = …; } meant to work? | 08:43:56 |
| emily | it seems to not regenerate wrappers or anything | 08:44:00 |
| emily | (looking for an LLVM stdenv that targets a different platform. I assume this should not require rebuilding all of LLVM since it's multi-target) | 08:49:12 |
| Artturin | In reply to @emilazy:matrix.org
it seems to not regenerate wrappers or anything CC not overriden automatically
https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/default.nix
you'll have to pass CC yourself https://github.com/NixOS/nixpkgs/blob/a31f2a7b37f2c0cc463768c2637413838da0f35b/pkgs/stdenv/cross/default.nix#L83 | 14:48:04 |
| emily | right | 14:48:25 |
| emily | it seemed like I'd need multiple layers of nested overrides and I resorted to pkgsCross in the end | 14:48:43 |
 Tristan Ross | In reply to @emilazy:matrix.org
is doing stdenv.override { whateverPlatform = …; } meant to work? Oh, that might explain why I see the Flutter engine update script not working after the changes with the platform attributes and using the ones from stdenv. | 15:46:11 |
| emily | hm? | 15:46:27 |
| emily | what changes? | 15:46:30 |
| Tristan Ross | The ones that changes the consumption of `*Platform` -> `stdenv.*Platform` | 15:47:12 |
| Tristan Ross | I think Artturin did that PR | 15:47:26 |
| Tristan Ross | It seems to have messed up the source fetching since Flutter engine sources are based on host and target. | 15:48:03 |
| Tristan Ross | I tried fixing it with overriding stdenv but that didn't help | 15:48:33 |
| emily | that seems really unlikely | 15:49:18 |
| emily | there's no semantic difference | 15:49:22 |
