Signed-off-by: Sandy Harris <sandyinch...@gmail.com>
---
 drivers/char/Makefile | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index d8a7579..7d095e5 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -2,7 +2,30 @@
 # Makefile for the kernel character device drivers.
 #
 
-obj-y                          += mem.o random.o
+obj-y                          += mem.o
+
+ifeq ($(CONFIG_RANDOM_GCM),y)
+  random_c             = random_gcm.c
+  random_o             = random_gcm.o
+  random_no            = random.o
+else
+  random_c             = random.c
+  random_o             = random.o
+  random_no            = random_gcm.o
+endif
+obj-y                          += $(random_o)
+
+# remove the generated file after use so that
+# a fresh one is built (by scripts/gen_random)
+# for every compile
+# remove random_no so it will not get linked
+ifeq ($(CONFIG_RANDOM_INIT),y)
+init-file = include/generated/random_init.h
+$(random_o): $(random_c) $(init-file)
+       $(CC) $< -o $@
+       $(Q) rm --force $(init-file) $(random_no)
+endif
+
 obj-$(CONFIG_TTY_PRINTK)       += ttyprintk.o
 obj-y                          += misc.o
 obj-$(CONFIG_ATARI_DSP56K)     += dsp56k.o
-- 
2.5.0

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