[PATCH] makefile: allow to disable all default-yes config variables with CONFIG_NOTHING=yes.

[Stefan Tauner]

All credit for this should be given to Patrick Georgi (see r1869).

Signed-off-by: Stefan Tauner 
---
 Makefile | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Makefile b/Makefile
index 095a49c..976d7ba 100644
--- a/Makefile
+++ b/Makefile
@@ -541,6 +541,13 @@ CONFIG_CH341A_SPI ?= yes
 # Disable wiki printing by default. It is only useful if you have wiki access.
 CONFIG_PRINT_WIKI ?= no

+# Disable all features if CONFIG_NOTHING=yes is given
+ifeq ($(CONFIG_NOTHING), yes)
+$(foreach var, $(filter CONFIG_%, $(.VARIABLES)),\
+	$(if $(filter yes, $($(var))),\
+		$(eval $(var)=no)))
+endif
+
 # Enable all features if CONFIG_EVERYTHING=yes is given
 ifeq ($(CONFIG_EVERYTHING), yes)
 $(foreach var, $(filter CONFIG_%, $(.VARIABLES)),\