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

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, May 22, 2013 at 12:51:42PM +0200, Paolo Bonzini wrote:
> Il 22/05/2013 12:50, Michael S. Tsirkin ha scritto:
> > On Wed, May 22, 2013 at 12:40:23PM +0200, Paolo Bonzini wrote:
> >> Il 22/05/2013 11:42, Michael S. Tsirkin ha scritto:
> >>> On Wed, May 22, 2013 at 11:22:52AM +0200, Paolo Bonzini wrote:
> >>>> Il 22/05/2013 10:52, Michael S. Tsirkin ha scritto:
> >>>>> The fix is simple here: don't use ccache.  I don't.
> >>>>>
> >>>>> In fact, from what I saw people use ccache to work around makefile bugs,
> >>>>> so they can do make clean; make and have it finish quickly.
> >>>>>
> >>>>> Any other examples?
> >>>>
> >>>> Testing configure patches should be done (also) from a clean build
> >>>> directory, for example.
> >>>
> >>> In fact, relying on make clean for testing the build
> >>> system is a mistake.  It's easy for it to forget to
> >>> remove some temporary file. You really should do
> >>> a clean clone.
> >>
> >> Yes, I use a clean clone (and a clean build directory for each patch),
> >> _hence_ ccache helps reducing test times.
> > 
> > I see, this workflow is the exact reverse of mine:
> > 
> > I do as much as possible in a single tree so I
> > rely on the makefile dependencies to be correct
> > to rebuild the right things.
> 
> Usually I do the same---I just do slightly more thorough testing for
> configure patches.
> 
> Paolo

I've no idea what happens with ccache on a crash by the way.
It's possible that it's careful to do renames in order to not leave
corrupted output files behind.

-- 
MST