From 0738d6fe7116cc2398bcb557c957ab38b712fe96 Mon Sep 17 00:00:00 2001 From: Juergen Gross Date: Tue, 13 Dec 2016 16:38:06 +0100 Subject: [PATCH] stubdom: modify ioemu linkfarm only if necessary Several stubdom libraries are being rebuilt each time a top level make is called as they depend on stubdom/ioemu/linkfarm.stamp which is depending on tools/qemu-xen-traditional-dir. Unfortunately this directory is modified by each "make tools" call. This can be avoided by writing stubdom/ioemu/linkfarm.stamp only if a source file beneath tools/qemu-xen-traditional-dir has been added or removed. Signed-off-by: Juergen Gross Acked-by: Wei Liu Reviewed-by: Samuel Thibault --- stubdom/Makefile | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/stubdom/Makefile b/stubdom/Makefile index bc49cfe48f..f85821088d 100644 --- a/stubdom/Makefile +++ b/stubdom/Makefile @@ -298,9 +298,13 @@ ioemu/linkfarm.stamp: $(XEN_ROOT)/tools/qemu-xen-traditional-dir (cd $$src && find * ! -type l -type f $(addprefix ! -name , \ '*.[oda1]' 'config-*' config.mak qemu-dm qemu-img-xen \ '*.html' '*.pod' \ - )) | \ - while read f; do rm -f "$$f"; ln -s "$$src/$$f" "$$f"; done - touch ioemu/linkfarm.stamp + )) >linkfarm.stamp.tmp; \ + cmp -s linkfarm.stamp.tmp linkfarm.stamp && \ + rm linkfarm.stamp.tmp || { \ + mv linkfarm.stamp.tmp linkfarm.stamp; \ + cat linkfarm.stamp | while read f; \ + do rm -f "$$f"; ln -s "$$src/$$f" "$$f"; done; \ + } else export QEMU_ROOT -- 2.30.2