Re: [PATCH] include: parallelize compat/xlat.h generation

[Keir Fraser <keir.xen@gmail.com>]

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Jan Beulich wrote:
>
> Splitting this up into pieces signficantly speeds up building on multi-
> CPU systems when making use of make's -j option.
>
> Signed-off-by: Jan Beulich<jbeulich@suse.com>


Yes, very welcome!

Acked-by: Keir Fraser <keir@xen.org>

>
> --- a/xen/include/Makefile
> +++ b/xen/include/Makefile
> @@ -66,14 +66,24 @@ compat/%.c: public/%.h xlat.lst Makefile
> $(PYTHON) $(BASEDIR)/tools/compat-build-source.py>$@.new
> mv -f $@.new $@
>
> -compat/xlat.h: xlat.lst $(filter-out compat/xlat.h,$(headers-y)) 
> $(BASEDIR)/tools/get-fields.sh Makefile
> +compat/.xlat/%.h: compat/%.h compat/.xlat/%.lst 
> $(BASEDIR)/tools/get-fields.sh Makefile
> export PYTHON=$(PYTHON); \
> - grep -v '^[ ]*#' xlat.lst | \
> - while read what name hdr; do \
> - hdr="compat/$$(echo $$hdr | sed 's,@arch@,$(compat-arch-y),g')"; \
> - echo '$(headers-y)' | grep -q "$$hdr" || continue; \
> - $(SHELL) $(BASEDIR)/tools/get-fields.sh "$$what" compat_$$name $$hdr 
> || exit $$?; \
> - done>$@.new
> + while read what name; do \
> + $(SHELL) $(BASEDIR)/tools/get-fields.sh "$$what" compat_$$name $< || 
> exit $$?; \
> + done<$(patsubst compat/%,compat/.xlat/%,$(basename $<)).lst>$@.new
> + mv -f $@.new $@
> +
> +.PRECIOUS: compat/.xlat/%.lst
> +compat/.xlat/%.lst: xlat.lst Makefile
> + mkdir -p $(@D)
> + grep -v '^[ \t]*#' $< | sed -ne 's,@arch@,$(compat-arch-y),g' -e 
> 's,[ \t]\+$*\.h[ \t]*$$,,p'>$@.new
> + $(call move-if-changed,$@.new,$@)
> +
> +xlat-y := $(shell sed -ne 's,@arch@,$(compat-arch-y),g' -e 's,^[?!][ 
> \t]\+[^ \t]\+[ \t]\+,,p' xlat.lst | uniq)
> +xlat-y := $(filter $(patsubst compat/%,%,$(headers-y)),$(xlat-y))
> +
> +compat/xlat.h: $(addprefix compat/.xlat/,$(xlat-y)) Makefile
> + cat $(filter %.h,$^)>$@.new
> mv -f $@.new $@
>
> ifeq ($(XEN_TARGET_ARCH),$(XEN_COMPILE_ARCH))
>
>

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