Subject: Re: Compiling git with makepp patch

From: Andreas Schwab <[email-masked]>
Date: Wed, 25 Aug 2010 23:56:11 +0200

Daniel Pfeiffer <[email-masked]> writes:

>  la 08/24/2010 06:32 AM Jonathan Nieder skribis:
>> Hi,
>>
>> Daniel Pfeiffer wrote:
>>> The file needs to be built immediately so
>>> that it can be included, before reading the rest of the makefile.
>>> But the dependency is only known to be phony after running the rule.
>>> Here you have a hen-egg problem, where I have no clue how Gnu make
>>> can cope (this is the one case where it requires .PHONY).
>> GNU make, unlike, say, pmake, reads all the rules before it runs
>> anything iirc.  So you can have
>>
>>   -include foo
>>
>>   foo:
>> 	echo bar:>foo
>> 	echo '	echo hi'>>foo
>>
>> and it will cope okay.
> While that is not the usual use-case for -include, the file might very
> well define some macros, and the rest of the makefile, indeed the foo-rule
> itself might depend on those macros.

GNU make will restart reading all makefiles when any of them was remade.

Andreas.

-- 
Andreas Schwab, [email-masked]
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