Makefile: remove extra ifdef/endif of top Makefile

The GNU make's origin function know undefined variable well,
so the outer ifdef/endif conditional checking is unneeded.

>From `info make` documentation, origin will return

  `undefined'
     if VARIABLE was never defined.
  `command line'
     if VARIABLE was defined on the command line.
   ...

Therefore, $(origin V) will get a value anyway, killing ifdef/endif
is viable and safe.

Furthermore, I've checked the minimal requirements from the top
Makefile is GNU make 3.81, and that version of GNU make has support
of origin function well already, so now it's safe to kill the outer
conditional checking, without upgrading the minimal requirements.

Signed-off-by: Cheng Renquan <crq@kernel.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
[ Commit description is borrowed from Linux Kernel
  (commit b8b0618cf6fa) and adjusted for Buildroot ]
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

diff --git a/Makefile b/Makefile
index c691b577e29048b7b8721931f5c02513ae1e9a65..2ad88325ea6d57986db150e1e71c325483d9023c 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -184,10 +184,8 @@ endif
 
 # To put more focus on warnings, be less verbose as default
 # Use 'make V=1' to see the full commands
-ifdef V
-  ifeq ("$(origin V)", "command line")
-    KBUILD_VERBOSE = $(V)
-  endif
+ifeq ("$(origin V)", "command line")
+  KBUILD_VERBOSE = $(V)
 endif
 ifndef KBUILD_VERBOSE
   KBUILD_VERBOSE = 0