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Nix Bindings

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Nix C API https://github.com/NixOS/nix/blob/master/doc/manual/src/c-api.md, language-specific bindings, and their use cases (currently broken link: https://nixos.org/manual/nix/unstable/c-api)18 Servers

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29 May 2025
@o-santi:matrix.orgLeonardo Santiago I didn't remove nor add any new things, just nix flake update nix && nix build 13:26:20
@o-santi:matrix.orgLeonardo Santiago Robert Hensing (roberth): did anything change in the libs side? I tried looking this error up and all I could find was a gcc version mismatch on different libraries, not sure that's the case here 13:27:17
@o-santi:matrix.orgLeonardo Santiago * I didn't remove nor add any new packages, just nix flake update nix && nix build 13:28:34
@o-santi:matrix.orgLeonardo Santiagois this a problem with libstd++? maybe a version mismatch?13:36:39
@o-santi:matrix.orgLeonardo Santiago nix/2.28.0 seems to be fine, nix/2.29.0 does reproduce the issue 13:42:58
@o-santi:matrix.orgLeonardo Santiago sadly I'm looking for libflake-c upgrades, 2.28.0 doesn't seem to contain, time to do some git bisect 13:44:31
@o-santi:matrix.orgLeonardo Santiago
c212035d94ee4407cd19927ba33e3246a07a54d0 is the first bad commit
commit c212035d94ee4407cd19927ba33e3246a07a54d0
Author: Robert Hensing <robert@roberthensing.nl>
Date:   Tue Apr 1 15:19:41 2025 +0200

    flake: nixpkgs: 24.11 -> nixos-unstable
    
    Flake lock file updates:
    
    • Updated input 'nixpkgs':
        'github:NixOS/nixpkgs/48d12d5e70ee91fe8481378e540433a7303dbf6a?narHash=sha256-1Noao/H%2BN8nFB4Beoy8fgwrcOQLVm9o4zKW1ODaqK9E%3D' (2024-12-16)
      → 'github:NixOS/nixpkgs/52faf482a3889b7619003c0daec593a1912fddc1?narHash=sha256-6hl6L/tRnwubHcA4pfUUtk542wn2Om%2BD4UnDhlDW9BE%3D' (2025-03-30)

 flake.lock | 8 ++++----
 flake.nix  | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)
bisect found first bad commit

14:14:20
@o-santi:matrix.orgLeonardo Santiago *
c212035d94ee4407cd19927ba33e3246a07a54d0 is the first bad commit
commit c212035d94ee4407cd19927ba33e3246a07a54d0
Author: Robert Hensing <robert@roberthensing.nl>
Date:   Tue Apr 1 15:19:41 2025 +0200

    flake: nixpkgs: 24.11 -> nixos-unstable
    
    Flake lock file updates:
    
    • Updated input 'nixpkgs':
        'github:NixOS/nixpkgs/48d12d5e70ee91fe8481378e540433a7303dbf6a?narHash=sha256-1Noao/H%2BN8nFB4Beoy8fgwrcOQLVm9o4zKW1ODaqK9E%3D' (2024-12-16)
      → 'github:NixOS/nixpkgs/52faf482a3889b7619003c0daec593a1912fddc1?narHash=sha256-6hl6L/tRnwubHcA4pfUUtk542wn2Om%2BD4UnDhlDW9BE%3D' (2025-03-30)

 flake.lock | 8 ++++----
 flake.nix  | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)
bisect found first bad commit
14:14:36
@roberthensing:matrix.orgRobert Hensing (roberth)Hmm yeah. Was going to say no major changes on our side14:14:43
@o-santi:matrix.orgLeonardo Santiago it seems that it might be related to the nixpkgs upgrade in nix 14:15:12
@o-santi:matrix.orgLeonardo Santiago though I'm not sure how, maybe it changed the major version of cc (is it using clang?) and the one I'm using is incompatible with it? 14:15:44
@o-santi:matrix.orgLeonardo SantiagoI looked up your nixops4 setup and it seemed pretty similar (almost exactly the same) as mine so I don't know what I'm doing wrongly14:16:13
@roberthensing:matrix.orgRobert Hensing (roberth)

clang?

Not on linux

14:16:18
@o-santi:matrix.orgLeonardo Santiago oh, so it's on gcc? that may be it, you have some gcc measures that I'm not using 14:16:45
@roberthensing:matrix.orgRobert Hensing (roberth)I do use clang on linux in my dev shell when hacking on the thing14:17:38
@o-santi:matrix.orgLeonardo SantiagoI'm not a super c++ guy but the only instance I found someone commenting this was because of a gcc13 -> 14 version mismatch and so I think that'd be the issue here too14:18:03
@roberthensing:matrix.orgRobert Hensing (roberth) May be possible to build it that way with pkgsLLVM 14:18:07
@o-santi:matrix.orgLeonardo Santiagoespecially given that it is a nixpkgs upgrade14:18:08
@o-santi:matrix.orgLeonardo Santiagowdym?14:18:20
@roberthensing:matrix.orgRobert Hensing (roberth) Something like nix build nixpkgs#pkgsLLVM.nixVersions.git 14:19:03
@roberthensing:matrix.orgRobert Hensing (roberth)It's not the most reliably buildable package set, but if it works...14:19:30
@o-santi:matrix.orgLeonardo Santiago oh, it was building fine with gcc before, I'll try to add your gcc countermeasures and see if that fixes it 14:19:45
@roberthensing:matrix.orgRobert Hensing (roberth)ok14:20:09
@o-santi:matrix.orgLeonardo Santiagoyep, apparently it worked14:30:58
@o-santi:matrix.orgLeonardo Santiagonope, false positive, tested on old nix version14:35:18
@o-santi:matrix.orgLeonardo Santiago just to confirm, indeed the bump made the jump from gcc13 to gcc14 and it seems to be inline with this gentoo forum error report: https://forums.gentoo.org/viewtopic-t-1172390-start-0.html 15:23:17
@o-santi:matrix.orgLeonardo Santiago * just to confirm, indeed the nixpkgs bump made the jump from gcc13 to gcc14 and it seems to be inline with this gentoo forum error report: https://forums.gentoo.org/viewtopic-t-1172390-start-0.html 15:23:52
@o-santi:matrix.orgLeonardo Santiago though I'm not entirely sure where this mismatch comes from. maybe the libclang I'm using in bindgen is equivalent to gcc13? I tried updating nixpkgs to latest but nothing worked 15:25:09
@o-santi:matrix.orgLeonardo Santiagohttps://github.com/llvm/llvm-project/issues/9661015:54:41
@o-santi:matrix.orgLeonardo Santiago this means that you're using bindgen with gcc, is that correct? 15:55:12

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