[Projects] Re: XRM r103: Fix the build process: don't use symlinks.

On 2007-01-09, Akim Demaille &lt;akim(a)lrde.epita.fr&gt; wrote: Although you already told me this, I learned it the hard way :| Why would I use $< ? According to GNU Make's manual: http://www.gnu.org/software/make/manual/html_node/Automatic-Variables.html $< The name of the first prerequisite. If the target got its commands from an implicit rule, this will be the first prerequisite added by the implicit rule (see Implicit Rules). $^ The names of all the prerequisites, with spaces between them. For prerequisites which are archive members, only the member named is used (see Archives). A target has only one prerequisite on each other file it depends on, no matter how many times each file is listed as a prerequisite. So if you list a prerequisite more than once for a target, the value of $^ contains just one copy of the name. This list does not contain any of the order-only prerequisites; for those see the `$|' variable, below. So $< is only for implicit rules, which is not the case here. $< happens to work in explicit rules with GNU make, but AFAIK $< does not get expanded in explicit rules with other make implementations (such as BSD make) $ uname -a NetBSD netbsd-3 3.0_BETA NetBSD 3.0_BETA (FLOP-SM-WITHOUT-CRYPT) #0: Tue Oct 25 01:38:54 CEST 2005 root@dump-test:/usr/src/sys/arch/i386/compile/FLOP-SM-WITHOU T-CRYPT i386 $ cat -n Makefile 1 all: dep 2 echo $@ 3 echo $< 4 echo $^ 5 6 dep: $ make echo all all echo echo $ which make /usr/bin/make $ gmake echo all all echo dep dep echo dep dep Dammit... Even $^ doesn't work with BSD make! :( -- SIGOURE Benoit aka Tsuna (SUSv3 compliant) _____ "On a long enough timeline, the survival rate /EPITA\ Promo 2008.CSI/ACU for everyone drops to zero" -- Jack.