kbuild: introduce $(kecho) convenience echo

There is a bunch of places in the build system where we do 'echo' to show
some nice status lines.  This means we still get output when running in
silent mode.  So declare a new KECHO variable that only does 'echo' when we
are in a suitable verbose build mode.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
[sam: added Documentation]
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

2 files changed, 21 insertions, 0 deletions

diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index 7a7753321a26..51104f9194a5 100644
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -383,6 +383,20 @@ more details, with real examples.
         to prerequisites are referenced with $(src) (because they are not
         generated files).
 
+    $(kecho)
+        echoing information to user in a rule is often a good practice
+        but when execution "make -s" one does not expect to see any output
+        except for warnings/errors.
+        To support this kbuild define $(kecho) which will echo out the
+        text following $(kecho) to stdout except if "make -s" is used.
+
+        Example:
+                #arch/blackfin/boot/Makefile
+                $(obj)/vmImage: $(obj)/vmlinux.gz
+                        $(call if_changed,uimage)
+                        @$(kecho) 'Kernel: $@ is ready'
+
+
 --- 3.11 $(CC) support functions
 
         The kernel may be built with several different versions of
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index 936940b541f9..8cf87e815e51 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -25,6 +25,13 @@ basetarget = $(basename $(notdir $@))
 escsq = $(subst $(squote),'\$(squote)',$1)
 
 ###
+# Easy method for doing a status message
+       kecho := :
+ quiet_kecho := echo
+silent_kecho := :
+kecho := $($(quiet)kecho)
+
+###
 # filechk is used to check if the content of a generated file is updated.
 # Sample usage:
 # define filechk_sample