From: Joe Buck <Joe.Buck@synopsys.COM>
To: Andi Kleen <ak@suse.de>,
Ulrich Weigand <weigand@i1.informatik.uni-erlangen.de>,
gcc@gcc.gnu.org, linux-kernel@vger.kernel.org,
schwidefsky@de.ibm.com
Subject: Re: Linux 2.6 nanosecond time stamp weirdness breaks GCC build
Date: Thu, 1 Apr 2004 14:39:08 -0800 [thread overview]
Message-ID: <20040401143908.B4619@synopsys.com> (raw)
In-Reply-To: <20040401203923.GA32177@nevyn.them.org>; from dan@debian.org on Thu, Apr 01, 2004 at 03:39:23PM -0500
[ Linux 2.6 losing the nanoseconds from a file timestamp ]
There are two different failure modes, but in most cases only one
results in a real problem.
Case 1: make falsely thinks that the .o is younger than the .c. It
decides not to rebuild the .o, resulting in a bad build.
Case 2: make falsely thinks that the .c is younger than the .o. It
recompiles the .c file, even though it didn't have to. Harmless.
So if we can make the bad situation look like a tie, and always rebuild
in the case of a tie, we will obtain valid builds, sometimes with
an extra compilation or two.
next prev parent reply other threads:[~2004-04-01 22:39 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-01 19:28 Linux 2.6 nanosecond time stamp weirdness breaks GCC build Ulrich Weigand
2004-04-01 20:09 ` Andi Kleen
2004-04-01 20:39 ` Daniel Jacobowitz
2004-04-01 20:46 ` Andi Kleen
2004-04-01 21:01 ` Ulrich Weigand
2004-04-01 21:44 ` Andi Kleen
2004-04-01 22:39 ` Joe Buck [this message]
2004-04-01 22:44 ` Paul Jarc
2004-04-01 22:48 ` Ulrich Weigand
2004-04-01 23:58 ` Joe Buck
2004-04-02 0:13 ` Daniel Jacobowitz
2004-04-02 0:02 ` Jamie Lokier
2004-04-02 0:35 ` Paul Eggert
2004-04-02 1:14 ` Jamie Lokier
2004-04-02 7:57 ` James H. Cloos Jr.
2004-04-02 9:22 ` Paul Eggert
2004-04-02 16:23 ` Jamie Lokier
2004-04-02 20:45 ` Paul Eggert
2004-04-02 21:07 ` Jamie Lokier
2004-04-02 21:56 ` Paul Eggert
2004-04-03 4:59 ` Andrew Pimlott
2004-04-02 0:37 ` Andrew Morton
2004-06-07 16:03 ` Jörn Engel
2004-04-01 21:13 ` Janis Johnson
2004-04-01 21:41 ` Ulrich Weigand
2004-04-02 0:30 ` Alan Modra
2004-04-02 9:05 ` P
2004-04-02 17:27 ` Alexandre Oliva
-- strict thread matches above, loose matches on Subject: below --
2004-04-01 20:51 Michael Elizabeth Chastain
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