[PATCH 4/4] build: fix that LZO file is always rebuilt

[Sam Ravnborg]

>From e398a00f84db33ea5ae7f6ee12c54511ef7a94fc Mon Sep 17 00:00:00 2001
From: Sam Ravnborg <sam at ravnborg.org>
Date: Tue, 26 Dec 2017 18:09:35 +0100
Subject: [PATCH 4/4] build: fix that LZO file is always rebuilt

Port the make-cmd from linux kernel.
with the updated version $$ is porperly escaped, thus
the LZO rule works as intended.
And we avoid rebuilds when not required

Signed-off-by: Sam Ravnborg <sam at ravnborg.org>
---
 scripts/Kbuild.include | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index 310dcdc94..fb3fa88fb 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -205,11 +205,13 @@ else
 arg-check = $(if $(strip $(cmd_$@)),,1)
 endif
 
-# >'< substitution is for echo to work,
-# >$< substitution to preserve $ when reloading .cmd file
-# note: when using inline perl scripts [perl -e '...$$t=1;...']
-# in $(cmd_xxx) double $$ your perl vars
-make-cmd = $(subst \\,\\\\,$(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1))))))
+# Replace >$< with >$$< to preserve $ when reloading the .cmd file
+# (needed for make)
+# Replace >#< with >\#< to avoid starting a comment in the .cmd file
+# (needed for make)
+# Replace >'< with >'\''< to be able to enclose the whole string in '...'
+# (needed for the shell)
+make-cmd = $(call escsq,$(subst \#,\\\#,$(subst $$,$$$$,$(cmd_$(1)))))
 
 # Find any prerequisites that is newer than target or that does not exist.
 # PHONY targets skipped in both cases.
-- 
2.12.0