LucyOS/derivations/cross_toolchain/gcc.nix

{ pkgs, binutils }:

let
  stdenv = pkgs.stdenv;

  nativePackages = with pkgs; [
    cmake
    zlib
    bison
  ];

  name = "gcc";
  version = "15.2.0";

  src = pkgs.fetchurl {
    url = "https://ftp.fau.de/gnu/${name}/${name}-${version}/${name}-${version}.tar.xz";
    hash = "sha256-Q4/ZloJrDIJIWinaA6ctcdbjVBqD7HAt9Ccfb+Al0k4=";
  };


  # Attributes for stdenv.mkDerivation can be found at:
  # https://nixos.org/manual/nixpkgs/stable/#sec-tools-of-stdenv
  gccPkg = stdenv.mkDerivation {
    /*
      Nixpkgs derivations automatically enable a few hardening flags, including some that cause non-literal format strings to become errors. https://nixos.org/manual/nixpkgs/stable/#sec-hardening-in-nixpkgs

      You can disable this particular one with
    */
    hardeningDisable = [ "format" ];

    /*
      But really the package author should be notified of the issue, and a patch should be applied. Even if it's clear that it's safe (it's probably not), NixOS is far from the only organization that enables hardening flags like this by default.
    */


    inherit name version src;

    secondarySrcs = [
      (pkgs.fetchurl {
        url = "https://ftp.fau.de/gnu/mpfr/mpfr-4.2.2.tar.xz";
        hash = "sha256-tnugOD736KhWNzTi6InvXsPDuJigHQD6CmhprYHGzgE=";
      })
      (pkgs.fetchurl {
        url = "https://ftp.fau.de/gnu/gmp/gmp-6.3.0.tar.xz";
        hash = "sha256-o8K4AgG4nmhhb0rTC8Zq7kknw85Q4zkpyoGdXENTiJg=";
      })
      (pkgs.fetchurl {
        url = "https://ftp.fau.de/gnu/mpc/mpc-1.3.1.tar.gz";
        hash = "sha256-q2QkkvXPiCt0qgy3MM1BCoHtzb7IlRg86TDnBsHHWbg=";
      })
    ];

    nativeBuildInputs = nativePackages ++ [ binutils ];
    buildInputs = with pkgs; [ gcc ];

    prePhases = "
          prepEnvironmentPhase ";

    prepEnvironmentPhase = ''
      export LFS_TGT=$(uname -m)-lfs-linux-gnu
      export BINTOOLS=${binutils}
      export LFS=$(pwd)
      export LFSTOOLS=$(pwd)/tools
      export PATH=$LFSTOOLS/bin:$PATH
      export CONFIG_SITE=$LFS/usr/share/config.site

      cp -r $BINTOOLS/* $LFS
      chmod -R u+w $LFS
    '';

    # Adding mpc, gmp, and mpfr to gcc source repo.
    patchPhase = ''
        export SOURCE=/build/$sourceRoot

        for secSrc in $secondarySrcs; do
            case $secSrc in
            *.xz)
                tar -xJf $secSrc -C ../$sourceRoot/
                ;;
            *.gz)
                tar -xzf $secSrc -C ../$sourceRoot/
                ;;
            *)
                echo "
          Invalid filetype: $secSrc "
                exit 1
                ;;
            esac

            srcDir=$(echo $secSrc | sed 's/^[^-]*-\(.*\)\.tar.*/\1/')
            echo " Src: $srcDir "
            newDir=$(echo $secSrc | cut -d'-' -f2)
            echo " newDir: $newDir "
            mv -v ./$srcDir ./$newDir
        done

        sed -e '/m64=/s/lib64/lib/' \
      -e '/m32=/s/m32=.*/m32=..\/lib32$(call if_multiarch,:i386-linux-gnu)/' \
      -i.orig gcc/config/i386/t-linux64

        sed '/STACK_REALIGN_DEFAULT/s/0/(!TARGET_64BIT \&\& TARGET_SSE)/' \
        -i gcc/config/i386/i386.h
    '';

    # CFLAGS and CXXFLAGS added to dodge string literal warning error.
    configurePhase = ''
        echo "
      Starting
      config "

              mkdir -v build
              cd build

        	mlist=m64,m32
        ../configure                  \
            --target=$LFS_TGT                              \
            --prefix=$LFSTOOLS                            \
            --with-glibc-version=2.42                      \
            --with-sysroot=$LFS                            \
            --with-newlib                                  \
            --without-headers                              \
            --enable-default-pie                           \
            --enable-default-ssp                           \
            --enable-initfini-array                        \
            --disable-nls                                  \
            --disable-shared                               \
            --enable-multilib --with-multilib-list=$mlist  \
            --disable-decimal-float                        \
            --disable-threads                              \
            --disable-libatomic                            \
            --disable-libgomp                              \
            --disable-libquadmath                          \
            --disable-libssp                               \
            --disable-libvtv                               \
            --disable-libstdcxx                            \
            --enable-languages=c,c++
    '';

    # Path to the GCC source headers is in gcc dir of source folder.
    # Concatenate these to create/populate internal limits.h of crossGcc
    postInstall = ''
        echo "
      Install
      complete."

          cat $LFS/$sourceRoot/gcc/limitx.h $LFS/$sourceRoot/gcc/glimits.h $LFS/$sourceRoot/gcc/limity.h > \
          $(dirname $($LFSTOOLS/bin/$LFS_TGT-gcc -print-libgcc-file-name))/include/limits.h

          rm -r $LFS/$sourceRoot
          cp -rvp $LFS/* $out/
    '';

    shellHook = ''
              echo -e "\033 [
          31
          mNix
          Develop -> $name: Loading...\033
          [
            0
            m
            "

              if [[ "$(basename $(pwd))
            " != "$name
            " ]]; then
          mkdir -p "$name
            "
          cd "$name
            "
      fi

      eval "$prepEnvironmentPhase
            "
      echo -e "\033
            [
              36
              mNix
              Develop -> $name: Loaded.\033[0m "
      echo -e "\033 [ 36 mNix Develop -> Current directory: $(pwd)\033 [ 0 m "
    '';
  };
in
gccPkg