[PATCH RFC 03/17] kbuild: implement loopable loop_cmd

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

The normal cmd can not be used in foreach, because it's prefixed by @.
Add an optional loopable variant as well as a noop_cmd that's suitable
for use in nesten $(call ...) invocations that would otherwise lead to
Make aborting due to perceived cycles in log_print.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 scripts/Kbuild.include | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index e905b5466371..a23d27cba315 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -158,6 +158,12 @@ delete-on-interrupt = \
 # print and execute commands
 cmd = @$(if $(cmd_$(1)),set -e; $($(quiet)log_print) $(delete-on-interrupt) $(cmd_$(1)),:)
 
+# The normal 'cmd' above is not *loopable*
+loop_cmd = $(if $(cmd_$(1)),set -e; $($(quiet)log_print) $(cmd_$(1)),:) || exit;
+
+# Like loop_cmd, but without printing
+noop_cmd = $(if $(cmd_$(1)),$(cmd_$(1)),:)
+
 ###
 # if_changed      - execute command if any prerequisite is newer than
 #                   target, or command line has changed
-- 
2.39.5