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Re: Fix remake rule-induced test failures with HP-UX make.

From: Eric Blake
Subject: Re: Fix remake rule-induced test failures with HP-UX make.
Date: Mon, 24 Jan 2011 14:24:17 -0700
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On 01/24/2011 02:07 PM, Ralf Wildenhues wrote:
> * Ralf Wildenhues wrote on Sat, Jan 15, 2011 at 01:55:18PM CET:
>>     docs: HP-UX make remakes targets with same time stamps as prereqs
>>     * doc/autoconf.texi (Timestamps and Make): Document HP-UX 11.31
>>     make issue with targets having the same time stamps as their
>>     prerequisites.
> Assuming this has been overlooked, ping!

Most likely true, as there has been a flurry of these lately (and with
various levels of cross-posting, so I may have missed that it was
extending outside the realm of automake).  :)

> While at it, how about appending some more info, as from the other
> patch:
>> --- a/doc/autoconf.texi
>> +++ b/doc/autoconf.texi
>> @@ -20183,7 +20183,9 @@ Timestamps and Make
>>          date >dest-stamp
>>  @end example
>> -
>> +Apart from timestamp resolution, there are also differences in handling
>> +equal timestamps.  HP-UX @command{make} updates targets if it has the
>> +same time stamp as one of its prerequisites, in violation of Posix rules.
> +This can cause spurious rebuilds for repeated runs of @command{make}.
> +This in turn can cause @command{make} to fail if it tries to rebuild
> +generated files in a possibly read-only source tree with tools not
> +present on the end-user machine.  Use GNU @command{make} instead.

Yes, this looks reasonable; go ahead.

Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library

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