netdev - [PATCH 4/9] kbuild: Add filechk2 function

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Date:   Thu,  5 Apr 2018 17:16:40 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     lkml <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
        linux-kbuild@...r.kernel.org,
        Quentin Monnet <quentin.monnet@...ronome.com>,
        Eugene Syromiatnikov <esyr@...hat.com>,
        Jiri Benc <jbenc@...hat.com>,
        Stanislav Kozina <skozina@...hat.com>,
        Jerome Marchand <jmarchan@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Jiri Kosina <jkosina@...e.cz>
Subject: [PATCH 4/9] kbuild: Add filechk2 function

Adding filechk2 function  that has the same semantics
as filechk, but it takes the target file from the 2nd
argument instead of from the '$@' as in the filechk
function.

This function is needed when we can't have separate
target for the file, like in the following patch.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 scripts/Kbuild.include | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index 065324a8046f..9775ce2771d4 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -67,6 +67,30 @@ define filechk
 	fi
 endef
 
+# filechk2 is used to check if the content of a generated file is updated.
+# It follows the same logic as the filechk except instead of the $@ target
+# variable, the checked file is passed in 2nd argument.
+#
+# Sample usage:
+# define filechk_sample
+#	echo $KERNELRELEASE
+# endef
+# version.h : Makefile
+#	$(call filechk2,sample,version.h)
+# endef
+define filechk2
+	$(Q)set -e;					\
+	$(kecho) '  CHK     $(2)';			\
+	mkdir -p $(dir $(2));				\
+	$(filechk_$(1)) < $< > $(2).tmp;		\
+	if [ -r $(2) ] && cmp -s $(2) $(2).tmp; then	\
+		rm -f $(2).tmp;				\
+	else						\
+		$(kecho) '  UPD     $(2)';		\
+		mv -f $(2).tmp $(2);			\
+	fi
+endef
+
 ######
 # gcc support functions
 # See documentation in Documentation/kbuild/makefiles.txt
-- 
2.13.6