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>

1 files changed, 14 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