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From: Paul Brook <paul@codesourcery.com>
Subject: Re: [Qemu-devel] Re: [PATCH 0/2] Build fixes
Date: Wed, 11 Nov 2009 03:07:27 +0000
References: <cover.1257428255.git.quintela@redhat.com>
	<20091105163741.GA3983@caradoc.them.org>
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To: qemu-devel@nongnu.org
Cc: Daniel Jacobowitz <dan@codesourcery.com>, Juan Quintela <quintela@redhat.com>

On Thursday 05 November 2009, Juan Quintela wrote:
> Daniel Jacobowitz <dan@codesourcery.com> wrote:
> > On Thu, Nov 05, 2009 at 05:17:46PM +0100, Juan Quintela wrote:
> >> How are you compiling?
> >> It works for me compiling in-tree with make -j3 (only 2 cores)
> >
> > I can reliably reproduce it by building all my QEMU configs at once.
> > I think that's a four-core or eight-core machine, -j4 in each build,
> > six separate qemu build trees.  I've reproduced it in a single build
> > tree a couple of times, but not reliably.
> 
> I have no way to reproduce reliablely :(

rm -f qemu-tool.[od] config-host.h
make qemu-tool.o

Reproduces reliably.
The following patch should expose any similar failures:

--- a/rules.mak
+++ b/rules.mak
@@ -44,5 +44,6 @@ cc-option = $(if $(shell $(CC) $1 $2 -S -o /dev/null -xc 
/dev/
        @test -f $@ || cp $< $@

 %.h-timestamp: %.mak
+       sleep 60
        $(call quiet-command, $(SRC_PATH)/create_config < $< > $@, "  GEN   
$*.h
        @cmp $@ $*.h >/dev/null 2>&1 || cp $@ $*.h


Paul