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Nixpkgs Stdenv

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27 Jul 2025
@Ericson2314:matrix.orgJohn Ericsonwell I would rather make the investment in hopes we can someday get 100%16:54:00
@Ericson2314:matrix.orgJohn Ericsonlike, if we shoot to 100% in the first go, we may well die trying16:54:35
@Ericson2314:matrix.orgJohn Ericsonbut if we shoot for "as far as we can get before it gets too hard", and know we won't get to 100%, we can get to somewhere else without tears and budget overruns16:55:35
@Ericson2314:matrix.orgJohn Ericsonand then we can later circle back, maybe in a later funding round when we have more budget on the basis of earlier successes :)16:56:24
28 Jul 2025
@reckenrode:matrix.orgRandy EckenrodeAnd Swift’s built-in Clang driver.00:36:22
@reckenrode:matrix.orgRandy EckenrodeI’m trying really hard not to use a wrapper with Swift.00:36:41
@reckenrode:matrix.orgRandy Eckenrode* And Swift’s built-in Clang driver/importer.00:37:20
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31 Jul 2025
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1 Aug 2025
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4 Aug 2022
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6 Aug 2022
@winterqt:nixos.devWinter (she/her)

Does anyone know where the fact that the Darwin stdenv builds CMake twice comes from? As far as I can tell, it's from stage 0, and then just gets used in the other stages from there. Am I missing something here, is it something with the overrides? It looks like it might be, but then the fact that those are only allowed in the final stage (per booter.nix) (when that doesn't seem true, since then they wouldn't be defined...?) comes up.

(Isn't this the same pattern (defining in one stage and referencing in the others) that makes Glibc only build a limited number of times in the Linux stdenv?)

08:00:17
@trofi:matrix.org@trofi:matrix.org

You think cmake should be rebuild less? Or more?

glibc's is probably a bit different as it's a part of stdenv.cc.libc and mainly used by that I would guess. Also, if depends if the package is used or not by other packages in the derivation would affect rebuild count as well.

14:59:09
@trofi:matrix.org@trofi:matrix.org Looking at stdenv's dep tree I see 2 cmake-boot hashes and one cmake hash: https://dpaste.com/8GGM6P9BF.txt 15:03:11
@winterqt:nixos.devWinter (she/her)
In reply to @trofi:matrix.org

You think cmake should be rebuild less? Or more?

glibc's is probably a bit different as it's a part of stdenv.cc.libc and mainly used by that I would guess. Also, if depends if the package is used or not by other packages in the derivation would affect rebuild count as well.

I have no particular opinion, I'm just curious how that happens.
21:22:09
@winterqt:nixos.devWinter (she/her) Oh, for clarification, I was talking about cmake-boot. 21:22:19
@winterqt:nixos.devWinter (she/her) (which is cmake in the stdenv stages) 21:22:29
@winterqt:nixos.devWinter (she/her)see the line i linked21:22:36
@trofi:matrix.org@trofi:matrix.org AFAIU cmake = cmakeMinimal is only for stage1-4 (first build: bootstrapTools -> cmake-boot in pastebin). Last stage uses cmake as is. Also note that cmakeMinimal is used by zstd (used by final stage, does second build: stage4 -> cmake-boot -> zstd in pastebin). 21:44:31
@trofi:matrix.org@trofi:matrix.org I used the following command to grep through the full depgraph: $ nix-store --query --graph $(nix-instantiate -A stdenv --argstr system x86_64-darwin) 21:45:39
10 Aug 2022
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17 Aug 2022
@trofi:matrix.org@trofi:matrix.org Quiz question: for a final glibc used in nixpkgs all over the place which gcc you think is used to build it on linux? a) Possible answers: gcc from bootstrap tools b) gcc from nixpkgs. 17:36:21
@trofi:matrix.org@trofi:matrix.orgYou knew :)17:39:09
@artturin:matrix.orgArtturinobviously it is the more ridiculous answer 🙃17:40:03
@trofi:matrix.org@trofi:matrix.orgYeah :) Spoiler: https://dpaste.com/DMD34BUN9.txt17:40:23

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