Description: mk: always rebuild in the same order

In order to achieve reproducible builds, always check dependencies in
the same order.

Origin: http://dpdk.org/dev/patchwork/patch/25679/
Forwarded: yes
Author: Luca Boccassi <luca.boccassi@gmail.com>
Last-Update: 2017-06-24
---
 mk/internal/rte.compile-pre.mk | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/mk/internal/rte.compile-pre.mk b/mk/internal/rte.compile-pre.mk
index da8dda498..5d519100c 100644
--- a/mk/internal/rte.compile-pre.mk
+++ b/mk/internal/rte.compile-pre.mk
@@ -108,13 +108,13 @@ C_TO_O_DO = @set -e; \
 compare = $(strip $(subst $(1),,$(2)) $(subst $(2),,$(1)))
 
 # return a non-empty string if the dst file does not exist
-file_missing = $(call compare,$(wildcard $@),$@)
+file_missing = $(call compare,$(sort $(wildcard $@)),$@)
 
 # return a non-empty string if cmdline changed
 cmdline_changed = $(call compare,$(strip $(cmd_$@)),$(strip $(1)))
 
 # return a non-empty string if a dependency file does not exist
-depfile_missing = $(call compare,$(wildcard $(dep_$@)),$(dep_$@))
+depfile_missing = $(call compare,$(sort $(wildcard $(dep_$@))),$(dep_$@))
 
 # return an empty string if no prereq is newer than target
 #     - $^ -> names of all the prerequisites
@@ -123,7 +123,7 @@ depfile_missing = $(call compare,$(wildcard $(dep_$@)),$(dep_$@))
 #       exist (filter-out removes existing ones from the list)
 #     - $? -> names of all the prerequisites newer than target
 depfile_newer = $(strip $(filter-out FORCE,$? \
-	$(filter-out $(wildcard $^),$^)))
+	$(filter-out $(sort $(wildcard $^)),$^)))
 
 # return 1 if parameter is a non-empty string, else 0
 boolean = $(if $1,1,0)
@@ -134,7 +134,7 @@ boolean = $(if $1,1,0)
 # user (by default it is empty)
 #
 .SECONDEXPANSION:
-%.o: %.c $$(wildcard $$(dep_$$@)) $$(DEP_$$(@)) FORCE
+%.o: %.c $$(sort $$(wildcard $$(dep_$$@))) $$(DEP_$$(@)) FORCE
 	@[ -d $(dir $@) ] || mkdir -p $(dir $@)
 	$(if $(D),\
 		@echo -n "$< -> $@ " ; \
-- 
2.11.0