gcc-arm-embedded-11: Fixed hydra build issue due to large derivation size.

pkgs/development/compilers/gcc-arm-embedded/11/default.nix

@@ -1,6 +1,5 @@
 { lib
 , stdenv
-, fetchurl
 , ncurses5
 , python38
 , libxcrypt-legacy
@@ -14,47 +13,59 @@ stdenv.mkDerivation rec {
   platform = {
     aarch64-linux = "aarch64";
     x86_64-darwin = "darwin-x86_64";
-    x86_64-linux  = "x86_64";
+    x86_64-linux = "x86_64";
   }.${stdenv.hostPlatform.system} or (throw "Unsupported system: ${stdenv.hostPlatform.system}");
 
-  src = fetchurl {
+  outputs = [ "out" "arm_none_eabi" ];
+
+  src = builtins.fetchTarball {
     url = "https://developer.arm.com/-/media/Files/downloads/gnu/${version}/binrel/arm-gnu-toolchain-${version}-${platform}-arm-none-eabi.tar.xz";
     sha256 = {
       aarch64-linux = "0pmm5r0k5mxd5drbn2s8a7qkm8c4fi8j5y31c70yrp0qs08kqwbc";
       x86_64-darwin = "1kr9kd9p2xk84fa99zf3gz5lkww2i9spqkjigjwakfkzbva56qw2";
-      x86_64-linux  = "08b1w1zmj4z80k59zmlc1bf34lg8d7z65fwvp5ir2pb1d1zxh86l";
+      x86_64-linux = "0zg754z0s8fx3qwh8jssf6rslnx9xmgcd2va6lykc8vlk8v5r19y";
     }.${stdenv.hostPlatform.system} or (throw "Unsupported system: ${stdenv.hostPlatform.system}");
   };
 
   dontConfigure = true;
   dontBuild = true;
-  dontPatchELF = true;
   dontStrip = true;
+  # this works, but automatic patchelf is run (and fails on 32-bit, relocatable files)
+  # when running auditTmpdir. noAuditTmpdir disables it, but it's not a good idea.
+  # This needs either a fix for patchelf or the script that feeds it the "wrong" ELF.
+  dontPatchELF = true;
 
   installPhase = ''
     mkdir -p $out
     cp -r * $out
+    # arm-none-eabi is a big boy and the complete outputs exceeds hydra's max_output_size.
+    moveToOutput "arm-none-eabi" "$arm_none_eabi"
+    # Link to it here in case anyone refers to it.
+    ln -s "$arm_none_eabi" "$out/arm-none-eabi"
+
+    # Wrap gdb with correct Python path.
+    mv $out/bin/arm-none-eabi-gdb $out/bin/arm-none-eabi-gdb-unwrapped
+    cat <<EOF > $out/bin/arm-none-eabi-gdb
+      #!${runtimeShell}
+      export PYTHONPATH=${python38}/lib/python3.8
+      export PYTHONHOME=${python38}/bin/python3.8
+      exec $out/bin/arm-none-eabi-gdb-unwrapped "\$@"
+    EOF
+    chmod +x $out/bin/arm-none-eabi-gdb
   '';
 
+  # Fix rpath for pre-compiled native binaries.
+  # WARNING: The target bineries in arm-none-eabi are not patched and may not work.
   preFixup = ''
-    find $out -type f | while read f; do
+    # We find all ELF files that are not for 32-bit (target files).
+    # This package only serves 64 bit systems anyways.
+    for f in $(find $out -type f -exec file {} \; | awk -F: '$2 ~ /ELF/ && ! /32-bit/ {print $1}'); do
       patchelf "$f" > /dev/null 2>&1 || continue
       patchelf --set-interpreter $(cat ${stdenv.cc}/nix-support/dynamic-linker) "$f" || true
       patchelf --set-rpath ${lib.makeLibraryPath [ "$out" stdenv.cc.cc ncurses5 python38 libxcrypt-legacy ]} "$f" || true
     done
   '';
 
-  postFixup = ''
-    mv $out/bin/arm-none-eabi-gdb $out/bin/arm-none-eabi-gdb-unwrapped
-    cat <<EOF > $out/bin/arm-none-eabi-gdb
-    #!${runtimeShell}
-    export PYTHONPATH=${python38}/lib/python3.8
-    export PYTHONHOME=${python38}/bin/python3.8
-    exec $out/bin/arm-none-eabi-gdb-unwrapped "\$@"
-    EOF
-    chmod +x $out/bin/arm-none-eabi-gdb
-  '';
-
   meta = with lib; {
     description = "Pre-built GNU toolchain from ARM Cortex-M & Cortex-R processors";
     homepage = "https://developer.arm.com/open-source/gnu-toolchain/gnu-rm";