Re: make(1) guru question
On Tue, Apr 06, 2004 at 12:11:35PM -0700, Luigi Rizzo wrote: > 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 > I can only confirm that this is the only known solution so far. Cheers, -- Ruslan Ermilov [EMAIL PROTECTED] FreeBSD committer pgp0.pgp Description: PGP signature
Re: make(1) guru question
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) > ___ > [EMAIL PROTECTED] mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "[EMAIL PROTECTED]" ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
make(1) guru question
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 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) ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
