[PATCH] linux-2.6.18-xen.hg: check that awk supports 'gensub' command

[Michael Abd-El-Malek <mabdelmalek@cmu.edu>]

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The linux-2.6.18-xen.hg/scripts/Makefile.xen.awk script depends on the 
GNU AWK-specific function "gensub".  If another awk is used (e.g., 
Debian installs mawk by default), the lack of gensub trickles down to 
cause the -xen.c files to not be compiled.  This was time-consuming to 
track.  So we should check that the awk program supports 'gensub'.

Signed-off-by: Michael Abd-El-Malek <mabdelmalek@cmu.edu>

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diff -r b0ec211da98a scripts/Makefile.build
--- a/scripts/Makefile.build	Fri Oct 05 10:51:53 2007 +0100
+++ b/scripts/Makefile.build	Tue Oct 09 22:45:45 2007 -0400
@@ -71,6 +71,8 @@ ifeq ($(CONFIG_XEN),y)
 ifeq ($(CONFIG_XEN),y)
 $(objtree)/scripts/Makefile.xen: $(srctree)/scripts/Makefile.xen.awk $(srctree)/scripts/Makefile.build
 	@echo '  Updating $@'
+	$(if $(shell echo a | $(AWK) '{ print gensub(/a/, "AA", "g"); }'),\
+        ,$(error 'Your awk program does not define gensub.  Use gawk or another awk with gensub'))
 	@$(AWK) -f $< $(filter-out $<,$^) >$@
 
 xen-src-single-used-m	:= $(patsubst $(srctree)/%,%,$(wildcard $(addprefix $(srctree)/,$(single-used-m:.o=-xen.c))))

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