Date: Sat, 12 Feb 2005 18:32:01 -0800 From: Kris Kennaway <kris@obsecurity.org> To: hackers@FreeBSD.org Subject: Makefile .for and .if expansion Message-ID: <20050213023201.GB24426@xor.obsecurity.org>
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The following small makefile doesn't behave as one would naively
expect:
MANLANG?=foo ""
all:
.for i in ${MANLANG}
.if empty(${i})
@echo foo ${i}
.endif
.endfor
ports-i386%make
foo foo
foo
I think this is because the .if evaluation is happening too early, and
it's not being done after the .for loop is expanded and the i variable
is set.
In order to get this to work I seem to have to do the following:
MANLANG?=foo ""
.for i in ${MANLANG}
j= ${i}
.if (${j} != "\"\"")
.for l in ${j}
k+= ${l}
.endfor
.endif
.endfor
all:
@echo ${k}
ports-i386%make
foo
If I remove the inner .for it breaks, and if I remove the j assignment
it breaks. Also if I try and remove the use of k and put an echo
inside the inner .for (with the all: preceding the whole loop) it
breaks.
This is extremely nasty.
Am I missing an easier way to do this?
Kris
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