Update 02

Dependencies

• [2] ZV5WPO25 Extend 02
• [3] VMUKZQZR Work on 02-nix-build

Change contents

• edit in 02-nix-build/flake.nix at line 27
  [2.294]

  [2.294]
  + # Note: If we were using Make/CMake/autoconf, the mkDerivation function

  + # could handle those automatically.
• replacement in 02-nix-build/demo.sh at line 2
  [3.4131]→[3.4131:4159](∅→∅)
  − # shellcheck disable=SC2288
  [3.4131]

  [3.4159]
  + # shellcheck disable=SC1010,SC2288
• edit in 02-nix-build/demo.sh at line 42
  [2.792]
  +

  + h We can also just run the executable directly

  + x nix run "$(dirname "${BASH_SOURCE[0]}")"

  +

  + h If we want to do development, we also get that \'for free\':

  + f type gcc

  + x nix develop --command "$(dirname "${BASH_SOURCE[0]}")/demo-inside-nix-develop.sh"
• file addition: demo-inside-nix-develop.sh (---r------)
  [3.2636]
  + #!/usr/bin/env bash

  + # shellcheck disable=SC1010

  + set -Eeuo pipefail

  +

  + source "$(dirname "${BASH_SOURCE[0]}")/../bash/libdemo.sh"

  +

  + h Now we do have gcc!

  + x type gcc

  +

  + h But Nix does all sorts of clever things such as wrapping the compiler

  + x file "$(command -v gcc)"

  +

  + h So that required libraries etc. are available

  + # shellcheck disable=SC2016

  + x eval 'echo "${NIX_LDFLAGS}"' \| grep -o --color=never -e \'\[^ \]*curl\[^ \]*\'

  +

  + h And we can in fact do

  + x gcc -o "$(dirname "${BASH_SOURCE[0]}")/wttr-delft" -lcurl "$(dirname "${BASH_SOURCE[0]}")/../src/simple.c"

  + x ./wttr-delft
• edit in .gitignore at line 2
  [2.805]
  + 02-nix-build/wttr-delft