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Re: [Qemu-devel] [PATCH] makefile: detect corrupted elf files

From: Anthony Liguori
Subject: Re: [Qemu-devel] [PATCH] makefile: detect corrupted elf files
Date: Sun, 26 May 2013 16:03:31 -0500
User-agent: Notmuch/0.15.2+77~g661dcf8 (http://notmuchmail.org) Emacs/23.3.1 (x86_64-pc-linux-gnu)

"Michael S. Tsirkin" <address@hidden> writes:

> On Sun, May 26, 2013 at 06:20:17PM +0000, Blue Swirl wrote:
> It's a simple issue.
> Each time I reboot during build, I have to make clean and rebuild.
> This wastes my time so I looked for ways to save the time.
> On my system at least, it has no measureable cost,
> likely also because size only looks at headers and metadata.
> If others are not interested, I can keep it out of tree.

You probably should.  Trying to be robust here is going to cause more
headache than it's worth.

I think your problem has better solutions too.  Doing a full build with
all optional dependencies enabled really doesn't take that long.

  $ time ( ~/git/qemu/configure && CCACHE_DISABLE=1 make -j24)
  <lots of output>
  real  2m28.222s
  user  21m33.763s
  sys   1m30.721s

I've switched to this as standard practice since it's so quick.

This is a modest two socket system with spinning disks.  I'm sure it's
even faster with more recent processors and SSDs.  With tmpfs as the
build directory it would probably fly.

Our build parallelizes very well, even if you only have slow systems,
distcc will work wonders.


Anthony Liguori

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