[PATCH v1] kbuild: Use '-f' instead of '--file=' for grep

[Will McVicker]

The posix grep utility doesn't support the longer '--file=pattern_file'
command line option which was introduced in commit ce697ccee1a8
("kbuild: remove head-y syntax"). Let's update Makefile to use '-f
pattern_file' to fix the compiling error:

  grep: Unknown option 'file=.../scripts/head-object-list.txt'
  (see "grep --help")

Signed-off-by: Will McVicker <willmcvicker@xxxxxxxxxx>
---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

base-commit: 1a2dcbdde82e3a5f1db9b2f4c48aa1aeba534fb2

diff --git a/Makefile b/Makefile
index d148a55bfd0f..e90bb2b38607 100644
--- a/Makefile
+++ b/Makefile
@@ -1218,7 +1218,7 @@ quiet_cmd_ar_vmlinux.a = AR      $@
       cmd_ar_vmlinux.a = \
 	rm -f $@; \
 	$(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
-	$(AR) mPiT $$($(AR) t $@ | head -n1) $@ $$($(AR) t $@ | grep -F --file=$(srctree)/scripts/head-object-list.txt)
+	$(AR) mPiT $$($(AR) t $@ | head -n1) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
 
 targets += vmlinux.a
 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt autoksyms_recursive FORCE
-- 
2.38.0.135.g90850a2211-goog