Perl in the toolchain

[Pete Zaitcev <zaitcev@redhat.com>]

Kai, what's your opinion? I suspect you missed my posing to l-k
http://www.uwsg.indiana.edu/hypermail/linux/kernel/0301.3/1203.html

-- Pete

Date: Thu, 30 Jan 2003 14:53:59 +0100
From: Konrad Eisele <eiselekd@web.de>
To: "PeteZaitcev" <zaitcev@redhat.com>
Subject: Adding sparc-leon linux to sourcetree

.....
There is also one change I have made on the buildsystem. Because I'm using some 
perl inline scripts in the $cmd_xxx the >'<  and >$< signs in the inline perl scripts 
cause trouble (perl -e '...$x=....'), the >'< because of the echo command, the >$< when
rereading from the xxx..cmd files. Could this be applied to the original file?

scripts/Makefile.lib:
+-------------------------------+

# ===========================================================================
# Generic stuff
# ===========================================================================

# function to only execute the passed command if necessary
# the ' -> '\'' and $ to $$ substitution are done if $(cmd_$(1)) includes a inline perlscript

if_changed = $(if $(strip $? \
		          $(filter-out $(cmd_$(1)),$(cmd_$@))\
			  $(filter-out $(cmd_$@),$(cmd_$(1)))),\
	@set -e; \
	$(if $($(quiet)cmd_$(1)),echo '  $(subst ','\'',$($(quiet)cmd_$(1)))';) \
	$(cmd_$(1)); \
	echo 'cmd_$@ := $(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D)/.$(@F).cmd)

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