Arch:E5 ditches eglibc and goes for musl libc!

Those of you who follow the development of Linux for embedded devices (or simply older hardware) will probably have noticed, that eglibc is effectively dead. According to their website “EGLIBC is no longer developed and such goals are now being addressed directly in GLIBC.”!

E5 and eglibc

Arch:E5 was built to be a bit lighter than todays mainline Arch. To do just that it’s obviously necessary to deal with the root of the trouble (yeah, a pretty lame pun, I know). The standard C library is – together with the kernel – the very heart of every Linux distro, that’s for sure! And since ordinary glibc is quite a memory hog, eglibc was a pretty self-evident choice to keep things a little smaller and prettier. But as this variant of the GNU C library will cease to exist after the 2.19 branch, E5 had to look for alternatives.

There are actually quite a few alternative C libraries around. Dietlibc for example. But it’s primarily meant for static linking. Yet there are more candidates. Like µclibc. A pretty nice libc actually which is also already proven and tested: There are even a few distributions built upon it. So could that be an option for E5? Nah, not really! Wanna know why not? ’cause it would be rather boring. And even worse: It has already been done for Arch and is even described in its own page on the ArchWiki!

So – is E5 doomed to eat humble pie and return to glibc, losing one of the main characteristics which made it diverge from mainline Arch? But no, fear not dear brethren! Luckily for us there’s also Musl, a rather young libc which you may not even have heard of. It has reached version 1.0 just these days and thus it practically calls for being used in place of our old C library! There are a few distros already which are based upon musl. But everything’s experimental and pretty much a mess to work with. In other words: Absolutely ideal preconditions!

I’ve been secretly working to make E5 run with musl as the distro’s libc for about two weeks now and just a few minutes ago I succeeded in getting E5 “Musl edition” to run! It was quite a bit of work and took quite some time. So far I have not spoken a word about it with anybody. But today’s the big day to announce it to the public!

Like the idea of Arch based on musl? If you don’t have a clue why you should like it, you may want to take a look at this table which compares musl to other libc projects. Convinced? Great! Now as proof that I’m not lying about the successful porting, here’s a screenshot which should confirm my claims:

Arch:E5 Musel’s boot screen!

Kernels…

While I was at it anyways, I thought that I might change the kernel as well. Ok, I have to admit that I’m still not cool enough to use some BSD kernel. But it’s clear that E5 (being an experimental distro!) needs something more… extraordinary. In the end I settled for a minimalistic Linux kernel by compiling one with the kernel settings from the TinyCore Linux project.

The result is really astounding if you ask me: That kernel image is just 2.5 Megs in size!! No, I’m not kidding. Don’t believe me? I can well understand you. But behold!, all you sceptics out there, here’s one more screenshot of the secret project for you:

Arch:E5 Musel with a TinyCore-like kernel!

So what do ‘ya say now? The “Arch Linux 3.10.33-1-LIBRE-LTS” line?? Uhm, well… *cough* Guess I gave that kernel a wrong name then! Yes, exactly that must be the case…

What’s next?

The logical next step would be publishing an E5-Musl repository, wouldn’t it??

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