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

[Eric Blake]

On 01/24/2011 02:07 PM, Ralf Wildenhues wrote:
> * Ralf Wildenhues wrote on Sat, Jan 15, 2011 at 01:55:18PM CET:
>>> http://autobuild.josefsson.org/automake/log-201101150749395803000.txt
> 
>>     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 http://libvirt.org

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