[XS] Change in coreboot[main]: Makefile.inc: Add filter_dupes macro

[Matt DeVillier (Code Review)]

Attention is currently required from: Martin L Roth.

Matt DeVillier has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/78831?usp=email )

Change subject: Makefile.inc: Add filter_dupes macro
......................................................................

Makefile.inc: Add filter_dupes macro

Add a macro to sort and filter out duplicate tokens from a string
variable. This will be used in a subsequent patch to correct the
calculation of the soft fuse bitmask value passed to amdfwtool.

TEST=tested with follow-on patch

Change-Id: Ic947b445efe44af9fcbaef52f6c5a5d949878bc9
Signed-off-by: Matt DeVillier 
---
M Makefile.inc
1 file changed, 2 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/31/78831/1

diff --git a/Makefile.inc b/Makefile.inc
index 22a4646..49e1657 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -147,6 +147,7 @@
 # toupper:        returns the value in all uppercase
 # ws_to_under:    returns the value with any whitespace changed to underscores
 # get_fmap_value  returns the value of a given FMAP field from fmap_config.h
+# remove_dupes    sorts and filters out duplicate tokens from a whitespace-separated string
 _toint=$(shell printf "%d" $1)
 _tohex=$(shell printf 0x"%x" $1)
 _int-add2=$(shell expr $(call _toint,$1) + $(call _toint,$2))
@@ -167,6 +168,7 @@
 toupper=$(shell echo '$1' | tr '[:lower:]' '[:upper:]')
 ws_to_under=$(shell echo '$1' | tr ' \t' '_')
 get_fmap_value=$(shell awk '$$2 == "$1" {print $$3}' $(obj)/fmap_config.h)
+remove_dupes=$(shell echo $1 | tr ' ' '\n' | sort | uniq | tr '\n' ' ')

#######################################################################
 # Helper functions for ramstage postprocess