On Thu, Mar 20, 2014 at 04:58:49PM -0400, John Mudd wrote:The version of Linux you build on has no bearing on the binary that
> Probably a dumb question. Is part of the value of musl that I can build an
> app using musl on linux 2.6 and then run the binary on linux 2.4?
comes out, so that's not a problem.
However, Linux 2.4 is not officially supported since it lacks a lot of
functionality needed to provide a modern POSIX conforming environment.
The most notable is that it can't do threads. If you're ok with that,
the other problems might be small enough that you don't mind. I
remember some people in Freenode #musl trying out 2.4 recently and
finding that a few of the busybox applets didn't work right, though,
due to missing statfs64 syscall.
This page has details on which kernel versions added which syscalls:
http://man7.org/linux/man-pages/man2/syscalls.2.html
so it may be helpful in evaluating if there's anything critical you'd
be missing. If a syscall has two versions, one with "64" on the end,
musl needs the one that ends in "64".
This is definitely a topic we could attempt to document better if more
people are interested in trying to use 2.4.
Rich