!ayCRiZriCVtuCUpeLp:nixos.org

Nix Cross Compiling

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18 Oct 2025
@matthewcroughan:defenestrate.itmatthewcroughan The code in pkgs/tools/package-management/nix/common-meson.nix looks pretty hacky 13:37:50
@matthewcroughan:defenestrate.itmatthewcroughanLike it appears there are even two DBIs instantiated there in the graph 13:38:13
@matthewcroughan:defenestrate.itmatthewcroughan to get a pkgs.nixos {} to compile with musl I had to nix.enable = false is the context here 13:40:25
@matthewcroughan:defenestrate.itmatthewcroughanI'll make it simpler by just doing the native musl case where it fails too13:41:37
@matthewcroughan:defenestrate.itmatthewcroughan

Ah, in that case the following happens, so it fails differently

        > check flags: SHELL=/nix/store/idi6v58lxi4qp6l41n7w6914ggpxnmqr-bash-5.3p3/bin/bash VERBOSE=y test
┃        > "/nix/store/aqnlwa4lky3sf8mrzzdvi0d8mmc3g3ni-perl-5.40.0/bin/perl" -MExtUtils::Command::MM -e 'cp_nonempty' -- DBI.bs blib/arch/auto/DBI/DBI.bs 644
┃        > PERL_DL_NONLAZY=1 "/bin/perl" "-MExtUtils::Command::MM" "-MTest::Harness" "-e" "undef *Test::Harness::Switches; test_harness(0, 'blib/lib', 'blib/arch')" t/*.t
┃        > /nix/store/idi6v58lxi4qp6l41n7w6914ggpxnmqr-bash-5.3p3/bin/bash: line 1: /bin/perl: No such file or directory
┃        > make: *** [Makefile:1435: test_dynamic] Error 127
┃        For full logs, run:
┃          nix log /nix/store/b6chj56gypfcy72xikpga7qqg841qarc-perl5.40.0-DBI-1.644.drv
13:42:00
@matthewcroughan:defenestrate.itmatthewcroughan Alyssa Ross: That's great! I see your splicing fixed one thing but showed this error up 13:48:37
@matthewcroughan:defenestrate.itmatthewcroughanThe above /bin/perl not found issue happens when I apply your patch https://github.com/NixOS/nixpkgs/pull/452642#discussion_r243703077713:48:53
@matthewcroughan:defenestrate.itmatthewcroughan But is solved the headers/type issues like /nix/store/imi8qddc1zxz2s76m5xvmbyl945i1ppg-perl-5.40.0/lib/perl5/5.40.0/aarch64-linux-thread-multi/CORE/proto.h:10777:15: error: unknown type name 'off64_t'; did you mean 'off_t'? 13:49:26
@matthewcroughan:defenestrate.itmatthewcroughan * But it solves the headers/type issues like /nix/store/imi8qddc1zxz2s76m5xvmbyl945i1ppg-perl-5.40.0/lib/perl5/5.40.0/aarch64-linux-thread-multi/CORE/proto.h:10777:15: error: unknown type name 'off64_t'; did you mean 'off_t'? 13:49:34
@matthewcroughan:defenestrate.itmatthewcroughanWill put that in the PR for posterity13:50:01
@qyliss:fairydust.spaceAlyssa RossTry nix-diff13:50:43
@matthewcroughan:defenestrate.itmatthewcroughan
- /nix/store/h19ly4ls25gwznag9i1xypif4a1a2sly-perl5.40.0-DBI-1.644-aarch64-unknown-linux-musl.drv:{out}
+ /nix/store/d24y94s4dv8x33b4r5q57vq9yzqwbc0z-perl5.40.0-DBI-1.644-aarch64-unknown-linux-musl.drv:{out}
• The set of input derivation names do not match:
    - perl-5.40.0
• The environments do not match:
    - AUTOMATED_TESTING=1
    - PERL_AUTOINSTALL=--skipdeps
    - PERL_USE_UNSAFE_INC=1
    - fullperl=/nix/store/imi8qddc1zxz2s76m5xvmbyl945i1ppg-perl-5.40.0
    + NIX_CFLAGS_COMPILE= -Doff64_t=off_t
    nativeBuildInputs=''
    /nix/store/imi8qddc1zxz2s76m5xvmbyl945i1ppg-perl-5.40.0/nix/store/hm7smwqxxgvyja6rvfxnvf428k731gj9-perl-aarch64-unknown-linux-musl-5.40.
13:53:58
@matthewcroughan:defenestrate.itmatthewcroughanAh.. I was still applying my NIX_CFLAGS_COMPILE 13:54:04
@matthewcroughan:defenestrate.itmatthewcroughanBut how exactly would that lead to perl not being found 13:55:06

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