26 Oct 2015 , tagged: Kernel, C, GCC, Binutils, make, osdev, cross compile

Writing an Operating System - Environment Setup

I’ve been reading The little book about OS development and wiki.osdev.org and took some notes along the line. Here’s what I wrote on environment setup.

Environment setup

You’ll need a cross compile toolchain consisting of GNU Binutils and gcc. The osdev wiki has a great page on setting up a cross compilation toolchain.

It took me a few times because I didn’t read the instructions properly. It is important to unpack the sources for binutils and gcc and have separate build directories, gcc-4.2 and gcc-build for example. Then, for building gcc, make sure the newly built binutils are on your path.

And finally, when building gcc, make sure you run make all-gcc, make all-target-libgcc, make install-gcc, and make install-target-libgcc instead of just make all like I did.

Also, running make with -j 4 or any value larger than 1 greatly sped up the build on my machine. Multicore for the win!

Once you’ve built both binutils and gcc you’re ready to start building your kernel!