Lesson 24, upgrading to El Capitan

24-el-capitan/Makefile

+../23-fixes/Makefile
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24-el-capitan/README.md

+**Goal: Update our build system to El Capitan**
+
+If you were following this guide from the beginning, and upgraded to El Capitan only
+to find that Makefiles don't compile anymore, follow these instructions to upgrade
+your cross-compiler.
+
+Otherwise, move on to the next lesson
+
+Upgrading the cross-compiler
+----------------------------
+
+We will follow the same instructions as in lesson 11, more or less.
+
+First, run `brew upgrade` and you will get your gcc upgraded to version 5.0 (at the time this guide was written)
+
+Then run `xcode-select --install` to update OSX commandline tools
+
+Once installed, find where your packaged gcc is (remember, not clang) and export it. For example:
+
+```
+export CC=/usr/local/bin/gcc-5
+export LD=/usr/local/bin/gcc-5
+```
+
+We will need to recompile binutils and our cross-compiled gcc. Export the targets and prefix:
+
+```
+export PREFIX="/usr/local/i386elfgcc"
+export TARGET=i386-elf
+export PATH="$PREFIX/bin:$PATH"
+```
+
+binutils
+--------
+
+Rember: always be careful before pasting walls of text from the internet. I recommend copying line by line.
+
+```sh
+mkdir /tmp/src
+cd /tmp/src
+curl -O http://ftp.gnu.org/gnu/binutils/binutils-2.24.tar.gz # If the link 404's, look for a more recent version
+tar xf binutils-2.24.tar.gz
+mkdir binutils-build
+cd binutils-build
+../binutils-2.24/configure --target=$TARGET --enable-interwork --enable-multilib --disable-nls --disable-werror --prefix=$PREFIX 2>&1 | tee configure.log
+make all install 2>&1 | tee make.log
+```
+
+
+gcc
+---
+```sh
+cd /tmp/src
+curl -O http://mirror.bbln.org/gcc/releases/gcc-4.9.1/gcc-4.9.1.tar.bz2
+tar xf gcc-4.9.1.tar.bz2
+mkdir gcc-build
+cd gcc-build
+../gcc-4.9.1/configure --target=$TARGET --prefix="$PREFIX" --disable-nls --disable-libssp --enable-languages=c --without-headers
+make all-gcc 
+make all-target-libgcc 
+make install-gcc 
+make install-target-libgcc 
+```
+

24-el-capitan/boot

+../23-fixes/boot
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24-el-capitan/cpu

+../23-fixes/cpu
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24-el-capitan/drivers

+../23-fixes/drivers
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24-el-capitan/kernel

+../23-fixes/kernel
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24-el-capitan/libc

+../23-fixes/libc
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