[PATCH 3/3] tools/libs: Fix headers.chk logic

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

c/s 4664034cd dropped the $(LIBHEADERSGLOB) dependency for the headers.chk
rule, without replacing it.

As headers.chk uses $^, a typical build looks like:

  andrewcoop@andrewcoop:/local/xen.git$ make -C tools/libs/devicemodel/
  make: Entering directory '/local/xen.git/tools/libs/devicemodel'
  for i in ; do \
      gcc -x c -ansi -Wall -Werror
      -I/local/xen.git/tools/libs/devicemodel/../../../tools/include \
            -S -o /dev/null $i || exit 1; \
      echo $i; \
  done >headers.chk.new
  mv headers.chk.new headers.chk

i.e. with an empty for loop, and checking only the $(AUTOINCS).

Reinsert a $(LIBHEADERS) dependency.

Fixes: 4664034cd ("tools/libs: move official headers to common directory")
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Juergen Gross <jgross@xxxxxxxx>
CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
CC: Wei Liu <wl@xxxxxxx>
---
 tools/libs/libs.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/libs/libs.mk b/tools/libs/libs.mk
index a68cec244c..2d973ccb95 100644
--- a/tools/libs/libs.mk
+++ b/tools/libs/libs.mk
@@ -76,7 +76,7 @@ else
 .PHONY: headers.chk
 endif
 
-headers.chk: $(AUTOINCS)
+headers.chk: $(LIBHEADERS) $(AUTOINCS)
 
 headers.lst: FORCE
        @{ set -e; $(foreach h,$(LIBHEADERS),echo $(h);) } > $@.tmp
-- 
2.11.0