[profile.release]
opt-level = 3
debug = false
split-debuginfo = '...'  # Platform-specific.
strip = "none"
debug-assertions = false
overflow-checks = false
lto = false
panic = 'unwind'
incremental = false
codegen-units = 16
rpath = false

In reply to @k900:0upti.me
And even -C opt-level=3 is different from -O3

i looked into this more and it seems thin local lto is redundant with codegen-units=1 anyway (and rustc disables thin local lto if codegen-units=1 and the lto level is unspecified)

buildRustCrate has defaultCodegenUnits ? 1 since the derivation doesn't allow for rebuilds on a higher granularity than per-crate anyway

i get flashbacks to random segfaults in c/c++ when this happens:

       > thread 'main' (13304) panicked at cargo-auditable/src/rustc_wrapper.rs:35:10:
       > rustc was terminated by a deadly signal
       > stack backtrace:
       >    0: __rustc::rust_begin_unwind
       >    1: core::panicking::panic_fmt
       >    2: core::option::expect_failed
       >    3: cargo_auditable::rustc_wrapper::main
       >    4: cargo_auditable::main
       > note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

💀

not sure, only got this in the output:

Caused by:
Caused by:
  process didn't exit successfully: `/nix/store/y7xffr129r4iqjwnrzsylp59837lkfbq-cargo-auditable-0.7.2/bin/cargo-auditable rustc ... (exit status: 101)

(deck@steamdeck-oled ~)$ head -n30 .local/bin/{.codium.nix,codium}
==> .local/bin/.codium.nix <==
with (import <nixpkgs>) { };
mkShell {
  nativeBuildInputs = [
    pkg-config
    clang_18
    lld_18
  ];
  buildInputs = [
    vscodium
    neovim
    nixfmt
(let
  fenix = import (fetchTarball "https://github.com/nix-community/fenix/archive/main.tar.gz") { };
in
fenix.complete.toolchain)
    pre-commit
#   rustfmt
#   rustPackages.clippy
    alsa-lib
    udev
    vulkan-loader
    vulkan-headers
    vulkan-tools
    xorg.libX11
    xorg.libXrandr
    xorg.libXcursor
    xorg.libXi
    (android-studio.withSdk (androidenv.composeAndroidPackages { includeNDK = true; }).androidsdk)
    cargo-ndk
  ];

==> .local/bin/codium <==
#!/bin/sh
exec nix-shell --run codium "$(dirname "$(realpath $0)")"/.codium.nix

  shellHook = ''export LD_LIBRARY_PATH="''${LD_LIBRARY_PATH:+$LD_LIBRARY_PATH:}${
    pkgs.lib.makeLibraryPath [
      alsa-lib
      udev
      vulkan-loader
      libxkbcommon
    ]
  }"'';
  RUST_SRC_PATH = rustPlatform.rustLibSrc;
}