Fix and extend cross compilation with static builds

Dependencies

• [2] SNMYL7H6 Update README
• [3] WK2OO4YY Tweak 04
• [4] 5LP7FPFX Fix CI
• [5] 52F4Q6CJ Update README
• [6] W2MX3YW4 Add CMake and cross example
• [7] EGQ4SEV5 Add demo for 04
• [8] UWWBKZ4R Improve README
• [*] 7AUC4NKI Initial commit

Change contents

• replacement in src/CMakeLists.txt at line 5
  [4.87]→[4.87:115](∅→∅)
  − find_package(CURL REQUIRED)
  [4.87]

  [4.115]
  + include(FindPkgConfig)

  + pkg_search_module(CURL REQUIRED libcurl)
• replacement in src/CMakeLists.txt at line 10
  [4.153]→[4.153:209](∅→∅)
  − target_link_libraries(wttr-delft PRIVATE CURL::libcurl)
  [4.153]

  [4.209]
  + target_link_libraries(wttr-delft ${CURL_LIBRARIES})

  + target_include_directories(wttr-delft PUBLIC ${CURL_INCLUDE_DIRS})

  + target_compile_options(wttr-delft PUBLIC ${CURL_CFLAGS_OTHER})
• replacement in README.md at line 26
  [2.616]→[2.616:754](∅→∅)
  − * [04-cmake-and-cross](04-cmake-and-cross/demo.sh): Building packages that use CMake, and cross-compile them for different architectures.
  [2.616]

  [4.473]
  + * [04-cmake-and-cross](04-cmake-and-cross/demo.sh): Building packages that use CMake, and cross-compile them for different architectures and static executables. Doing the same with emulation.
• edit in 04-cmake-and-cross/wttr-delft.nix at line 4
  [4.361]

  [4.361]
  + , pkgconfig
• replacement in 04-cmake-and-cross/wttr-delft.nix at line 14
  [4.235]→[4.235:268](∅→∅)
  − nativeBuildInputs = [ cmake ];
  [4.235]

  [4.597]
  + nativeBuildInputs = [ cmake pkgconfig ];
• replacement in 04-cmake-and-cross/flake.nix at line 27
  [3.93]→[4.701:747](∅→∅),[4.4591]→[4.701:747](∅→∅),[4.747]→[3.94:277](∅→∅)
  − packages.default = pkgs.wttr-delft;

  − # But the package set also has a pkgsCross set, and we can select our package from one of its contents

  − packages.cross-riscv64 = pkgs.pkgsCross.riscv64.wttr-delft;
  [3.93]

  [4.4895]
  + packages = {

  + default = pkgs.wttr-delft;

  + # But the package set also has a pkgsCross set, and we can select our package from one of its contents

  + cross-riscv64 = pkgs.pkgsCross.riscv64.wttr-delft;

  + static = pkgs.pkgsCross.musl64.pkgsStatic.wttr-delft;

  + cross-aarch64-static = pkgs.pkgsCross.aarch64-multiplatform.pkgsStatic.wttr-delft;

  + };
• edit in 04-cmake-and-cross/demo.sh at line 24
  [4.1421]→[4.1421:1485](∅→∅)
  − # x nix build "${dir}" -L --rebuild

  −

  − h Checking out the closure
• edit in 04-cmake-and-cross/demo.sh at line 25
  [4.1486]→[4.1486:1590](∅→∅)
  − n The \'closure\' is the full set of all the \(runtime\) dependencies:

  −

  − x nix path-info -sSrh ./result

  −
• replacement in 04-cmake-and-cross/demo.sh at line 34
  [3.638]→[3.638:673](∅→∅)
  − x nix build "${dir}#cross-riscv64"
  [3.638]

  [3.673]
  + x nix build "${dir}#cross-riscv64" -L
• edit in 04-cmake-and-cross/demo.sh at line 38
  [3.752]

  [3.752]
  + h Static executables

  + , We can also cross compile a static build:

  + x nix build "${dir}#static" -L

  + , And this is indeed a static binary:

  + x "${file_cmd}" ./result/bin/wttr-delft

  + x ls -lh ./result/bin/wttr-delft

  +

  + h Everything together

  + , Static cross compiled for aarch64-linux - you can copy this executable and run it on a Raspberry Pi!

  + x nix build "${dir}#cross-aarch64-static" -L

  + x "${file_cmd}" ./result/bin/wttr-delft

  + x ls -lh ./result/bin/wttr-delft

  +
• replacement in 04-cmake-and-cross/demo.sh at line 61
  [4.187]→[4.187:189](∅→∅)
  − p
  [4.2139]
  + , And we can actually run it as well!

  + x ./result/bin/wttr-delft