From a0a8188d82a9392d47c9677683cfd5aacfe18674 Mon Sep 17 00:00:00 2001
From: Lucy <lucy@c-base.org>
Date: Mon, 1 Sep 2025 19:57:53 +0200
Subject: [PATCH] gcc

---
 derivations/cross_toolchain/binutils.nix     |  31 +++-
 derivations/cross_toolchain/gcc.nix          | 184 +++++++++++++++++++
 derivations/cross_toolchain/glibc.nix        | 102 ++++++++++
 derivations/cross_toolchain/linuxHeaders.nix |  87 +++++++++
 flake.nix                                    |   4 +
 5 files changed, 399 insertions(+), 9 deletions(-)
 create mode 100644 derivations/cross_toolchain/gcc.nix
 create mode 100644 derivations/cross_toolchain/glibc.nix
 create mode 100644 derivations/cross_toolchain/linuxHeaders.nix

diff --git a/derivations/cross_toolchain/binutils.nix b/derivations/cross_toolchain/binutils.nix
index 5730521..8667dfa 100644
--- a/derivations/cross_toolchain/binutils.nix
+++ b/derivations/cross_toolchain/binutils.nix
@@ -2,6 +2,9 @@
 let
   stdenv = pkgs.stdenv;
 
+  name = "binutils";
+  version = "2.45";
+
   nativePackages = with pkgs; [
     cmake
     zlib
@@ -9,14 +12,25 @@ let
     bison
   ];
 
-  binutilsPkg = stdenv.mkDerivation {
-    name = "binutils";
-    version = "2.45";
+  src = pkgs.fetchurl {
+    url = "https://ftp.fau.de/gnu/${name}/${name}-${version}.tar.xz";
+    hash = "sha256-xQwOf5yxiJgOLMl+RTdiaxZyRBgVWH8eq2nSob++9dI=";
+  };
 
-    src = pkgs.fetchurl {
-      url = "https://sourceware.org/pub/${name}/releases/${name}-${version}.tar.xz";
-      hash = "";
-    };
+  binutilsPkg = stdenv.mkDerivation {
+    inherit name version src;
+
+
+    /*
+      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.
+    */
 
     nativeBuildInputs = [ nativePackages ];
     buildInputs = [ ];
@@ -29,8 +43,6 @@ let
       mkdir -v $LFSTOOLS
     '';
 
-
-    # Using --prefix=$out instead of $LFS/tools.
     configurePhase = ''
       echo "Configuring... "
       echo "Starting config"
@@ -65,3 +77,4 @@ let
   };
 in
 binutilsPkg
+
diff --git a/derivations/cross_toolchain/gcc.nix b/derivations/cross_toolchain/gcc.nix
new file mode 100644
index 0000000..bbf9a9d
--- /dev/null
+++ b/derivations/cross_toolchain/gcc.nix
@@ -0,0 +1,184 @@
+{ pkgs, binutils }:
+
+let
+  stdenv = pkgs.stdenv;
+
+  nativePackages = with pkgs; [
+    cmake
+    zlib
+    bison
+  ];
+
+  name = "gcc";
+  version = "15.2.0";
+
+  src = pkgs.fetchurl {
+    url = "https://ftp.fau.de/gnu/${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: $(pwd)\033 [ 0 m "
+    '';
+  };
+in
+gccPkg
+
diff --git a/derivations/cross_toolchain/glibc.nix b/derivations/cross_toolchain/glibc.nix
new file mode 100644
index 0000000..55881be
--- /dev/null
+++ b/derivations/cross_toolchain/glibc.nix
@@ -0,0 +1,102 @@
+{ pkgs, cc1 }:
+let
+  stdenvNoCC = pkgs.stdenvNoCC;
+
+  nativePackages = with pkgs; [
+    bison
+    texinfo
+    perl
+    python3
+  ];
+
+  name = "glibc";
+  version = "2.42";
+
+
+
+  # Attributes for stdenv.mkDerivation can be found at:
+  # https://nixos.org/manual/nixpkgs/stable/#sec-tools-of-stdenv
+  glibcPkg = stdenvNoCC.mkDerivation {
+    inherit name version;
+
+    src = pkgs.fetchurl {
+      url = "https://ftp.fau.de/gnu/${name}/${name}-${version}.tar.xz";
+      hash = "";
+    };
+
+    patchSrc = pkgs.fetchurl {
+      url = "https://www.linuxfromscratch.org/patches/lfs/development/${name}-${version}-fhs-1.patch";
+      hash = "";
+    };
+
+
+    nativeBuildInputs = [ nativePackages ];
+    buildInputs = [ cc1 pkgs.gcc ];
+
+    prePhases = "prepEnvironmentPhase";
+    prepEnvironmentPhase = ''
+      export LFS=$PWD
+      export LFSTOOLS=$LFS/tools
+      export LFS_TGT=$(uname -m)-lfs-linux-gnu
+      export PATH=$LFSTOOLS/bin:$PATH
+      export PATH=$LFS/usr/bin:$PATH
+      export CC1=${cc1}
+      export CONFIG_SITE=$LFS/usr/share/config.site
+
+      cp -r $CC1/* $LFS/
+      chmod -R u+w $LFS
+
+    '';
+
+    configurePhase = ''
+       echo "rootsbindir=/usr/sbin" > configparms
+       cp -pv $patchSrc ./glibc.patch
+       patch -Np1 -i ./glibc.patch
+
+       mkdir -v build
+       cd build
+
+      ../configure                              \
+           --prefix=/usr                        \
+           --host=$LFS_TGT                      \
+           --build=$(../scripts/config.guess)   \
+           --enable-kernel=4.19                 \
+           --with-headers=$LFS/usr/include      \
+           --disable-nscd                       \
+           libc_cv_slibdir=/usr/lib
+    '';
+
+    installFlags = [ "DESTDIR=$(LFS)" ];
+
+    postInstall = ''
+      sed '/RTLDLIST=/s@/usr@@g' -i $LFS/usr/bin/ldd
+
+      pushd $LFS/lib
+      case $(uname -m) in
+          i?86)   ln -sfv ./ld-linux.so.2 ./ld-lsb.so.3
+          ;;
+          x86_64) ln -sfv ./ld-linux-x86-64.so.2 ../lib64
+                  ln -sfv ./ld-linux-x86-64.so.2 ../lib64/ld-lsb-x86-64.so.3
+          ;;
+      esac
+      popd
+
+      rm -r $LFS/$sourceRoot
+      cp -rvp $LFS/* $out/
+    '';
+
+    shellHook = ''
+      echo -e "\033[31mNix Develop -> $name: Loading...\033[0m"
+
+      if [[ "$(basename $(pwd))" != "$name" ]]; then
+          mkdir -p "$name"
+          cd "$name"
+      fi
+
+      eval "$prepEnvironmentPhase"
+      echo -e "\033[36mNix Develop -> $name: Loaded.\033[0m"
+      echo -e "\033[36mNix Develop -> Current directory: $(pwd)\033[0m"
+    '';
+  };
+in
+glibcPkg
diff --git a/derivations/cross_toolchain/linuxHeaders.nix b/derivations/cross_toolchain/linuxHeaders.nix
new file mode 100644
index 0000000..88c272a
--- /dev/null
+++ b/derivations/cross_toolchain/linuxHeaders.nix
@@ -0,0 +1,87 @@
+{ pkgs, cc1 }:
+let
+  nixpkgs = pkgs;
+  stdenv = nixpkgs.stdenv;
+
+  nativePackages = with pkgs; [
+    cmake
+    zlib
+    bison
+    # binutils
+  ];
+
+  name = "linux-headers";
+  version = "6.17-rc4";
+
+  headersCCPkgs = stdenv.mkDerivation {
+    inherit name version;
+
+    src = pkgs.fetchurl {
+      url = "https://git.kernel.org/torvalds/t/linux-${version}.tar.gz";
+      hash = "";
+    };
+
+    nativeBuildInputs = [ nativePackages ];
+    buildInputs = [ cc1 ];
+
+
+    prePhases = "prepEnvironmentPhase";
+    prepEnvironmentPhase = ''
+      export LFS=$(pwd)
+      export LFSTOOLS=$(pwd)/tools
+      export PATH=$LFSTOOLS/bin:$PATH
+      export PATH=$LFS/usr/bin:$PATH
+      export CONFIG_SITE=$LFS/usr/share/config.site
+      export CC1=${cc1}
+
+      chmod -R u+w ./
+
+      cp -r $CC1/* $LFS
+      chmod -R u+w $LFS
+
+      mkdir -vp $LFS/usr/{bin,lib,sbin} $LFS/{etc,var}
+
+      case $(uname -m) in
+          x86_64) mkdir -pv $LFS/lib64 ;;
+      esac
+    '';
+
+
+    configurePhase = ''
+      echo "Starting config"
+      make mrproper
+
+    '';
+
+    buildPhase = ''
+      make headers
+    '';
+
+    installPhase = ''
+      runHook preInstall
+
+      find ./usr/include -type f ! -name '*.h' -delete
+
+      mkdir $out
+      cp -rvp ./usr/include $LFS/usr
+      rm -r $LFS/$sourceRoot
+      cp -rvp $LFS/* $out/
+
+      runHook postInstall
+    '';
+
+    shellHook = ''
+      echo -e "\033[31mNix Develop -> $name: Loading...\033[0m"
+
+      if [[ "$(basename $(pwd))" != "$name" ]]; then
+          mkdir -p "$name"
+          cd "$name"
+      fi
+
+      eval "$prepEnvironmentPhase"
+      echo -e "\033[36mNix Develop -> $name: Loaded.\033[0m"
+      echo -e "\033[36mNix Develop -> Current directory: $(pwd)\033[0m"
+    '';
+  };
+in
+headersCCPkgs
diff --git a/flake.nix b/flake.nix
index cbc000d..0ba1011 100644
--- a/flake.nix
+++ b/flake.nix
@@ -17,9 +17,13 @@
 
       # Cross Compilation Toolchain
       binutilsStage = import ./derivations/cross_toolchain/binutils.nix { pkgs = pkgs; };
+      gccStage1 = import ./derivations/cross_toolchain/gcc.nix { pkgs = pkgs; binutils = binutilsStage; };
+      linuxHeadersStage = import ./derivations/cross_toolchain/linuxHeaders.nix { pkgs = pkgs; cc1 = linuxHeadersStage; };
     in
     {
       packages.${system}.crossToolchain = {
+        linuxHeaders = linuxHeadersStage;
+        gcc = gccStage1;
         binutils = binutilsStage;
       };