Install a minimal development toolchain

lightweight_toolchain.sh

#!/bin/env bash

packages=(
  DevSDK.pkg
  DeveloperToolsCLI.pkg
  DeveloperToolsSystemSupport.pkg
  gcc4.2.pkg
  llvm-gcc4.2.pkg
  clang.pkg
)

hdiutil create -size 1G -type SPARSEBUNDLE -fs HFSX -layout none -uid 0 -gid 0 -volname MinimalToolchain /tmp/minimal_toolchain.sparsebundle

hdiutil attach -noverify "/path/to/xcode_4.1_for_lion__gm_seed.dmg"
hdiutil attach -noverify "/tmp/minimal_toolchain.sparsebundle"

for package in ${packages[@]}; do
  installer -verbose -pkg "/Volumes/Xcode/Packages/$package" -target /Volumes/MinimalToolchain
done

mkdir /Developer
mv /Volumes/MinimalToolchain/* /Developer/

hdiutil detach /Volumes/MinimalToolchain
rm -R /tmp/minimal_toolchain.sparsebundle

hdiutil detach /Volumes/Xcode

Cool. Saves a bunch of time, presumably?

@dsturnbull The main reason for doing this was frustration on @lachlanhardy's part and curiosity on my own. But yes, installing will be much quicker because you're installing ~800MB, not 3.5GB. Might be more appropriate if all you're after is a Homebrew-ready toolchain.