Date: Tue, 6 Apr 2004 12:11:35 -0700 From: Luigi Rizzo <rizzo@icir.org> To: Jens Schweikhardt <schweikh@schweikhardt.net> Cc: hackers@freebsd.org Subject: Re: make(1) guru question Message-ID: <20040406121135.A98012@xorpc.icir.org> In-Reply-To: <20040406182600.GA3907@schweikhardt.net>; from schweikh@schweikhardt.net on Tue, Apr 06, 2004 at 08:26:00PM %2B0200 References: <20040406182600.GA3907@schweikhardt.net>
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On Tue, Apr 06, 2004 at 08:26:00PM +0200, Jens Schweikhardt wrote: > Fellow hackers, > > suppose you have a long list of files in a make variable V, exceeding > kern.argmax. This means there is no way you can write a rule where $(V) > is a command argument in any way shape or form. There is also no way to > pass the value of V to xargs that I know of. For example with this depending on the use, you might use something like make -V variable_name | xargs ... within the makefile. I got the suggestion from someone long ago when I had this problem with src/sys/conf/Makefile.i386 cheers luigi > Makefile: > > # Make V exceed kern.argmax (64K). > V != jot 12440 > all: > @ echo $(V) > > This fails with > > echo:Argument list too long > *** Error code 1 > > Furthermore the workaround of creating a process for each file in V with > > V != jot 12440 > all: > .for v in $(V) > @ echo $(v) > .endfor > > is not acceptable because it creates too much overhead for process > creation (think of echo being an expensive command.) Question: is there > any other way (short of increasing kern.argmax) to maybe divide and > conquer the V contents by use of substitution magic? I'm thinking of > something along repeatedly cramming N items in some variable and then > calling echo less often. > > The original problem can be found in > http://www.freebsd.org/cgi/query-pr.cgi?pr=ports/52765 > > Regards, > > Jens > -- > Jens Schweikhardt http://www.schweikhardt.net/ > SIGSIG -- signature too long (core dumped) > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org"
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