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milahu / nixpkgs

Nix Packages collection
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mkDerivation: use __structuredAttrs to pass makeFlags/cmakeFlags/... as array of strings #58

Open milahu opened 6 months ago

milahu commented 6 months ago

https://github.com/NixOS/nixpkgs/issues/114044

https://discourse.nixos.org/t/cmakeflags-and-spaces-in-option-values/20170

`cmakeFlags` are currently passed to CMake as follows: [pkgs/development/tools/build-managers/cmake/setup-hook.sh](https://github.com/NixOS/nixpkgs/blob/b6236dbddb6852a9567588f1a87ba2521bb71e58/pkgs/development/tools/build-managers/cmake/setup-hook.sh#L121-L122) ``` cmake ${cmakeDir:-.} $cmakeFlags "${cmakeFlagsArray[@]}" ``` so Bash will tokenize them on spaces and there is no way to prevent it. The only alternative is adding the flag to `cmakeFlagsArray` in a Bash code. For example: ``` preConfigure = '' cmakeFlagsArray+=( "-DSOMELIB_CXX_FLAGS=\"-O3 -march=native\"" ) ''; ``` In the future, this might be possible from Nix through [__structuredAttrs](https://github.com/NixOS/nixpkgs/pull/72074).

https://github.com/NixOS/nixpkgs/pull/175649

workaround

{
  makeFlags = [
    # FIXME stdenv.mkDerivation fails to preserve the space after "-fcommon"
    #''EXTRA_CFLAGS="-fcommon -DTARGET_FORMAT=${targetFormat}"''
    # no. in bash, the backslash is a separate char of the string
    #"EXTRA_CFLAGS=-fcommon\\ -DTARGET_FORMAT=${targetFormat}"
  ]; 

  preConfigure = ''
    # no. gcc: error: unrecognized command-line option '-fcommon -DTARGET_FORMAT=AVM_LE'
    #makeFlagsArray+=('EXTRA_CFLAGS="-fcommon -DTARGET_FORMAT=${targetFormat}"')
    makeFlagsArray+=('EXTRA_CFLAGS=-fcommon -DTARGET_FORMAT=${targetFormat}')
  '';