[PATCH v2 13/15] samples: auxdisplay: use 'userprogs' syntax

[Masahiro Yamada]

Kbuild now supports the 'userprogs' syntax to compile userspace
programs for the same architecture as the kernel.

Add the entry to samples/Makefile to put this into the build bot
coverage.

I also added the CONFIG option guarded by 'depends on CC_CAN_LINK'
because $(CC) may not provide libc.

Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Acked-by: Miguel Ojeda <miguel.ojeda.sandonis@xxxxxxxxx>
Acked-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
---

Changes in v2: None

 samples/Kconfig             |  4 ++++
 samples/Makefile            |  1 +
 samples/auxdisplay/Makefile | 11 ++---------
 3 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/samples/Kconfig b/samples/Kconfig
index 69699db49675..2322e11e8b80 100644
--- a/samples/Kconfig
+++ b/samples/Kconfig
@@ -6,6 +6,10 @@ menuconfig SAMPLES
 
 if SAMPLES
 
+config SAMPLE_AUXDISPLAY
+	bool "auxdisplay sample"
+	depends on CC_CAN_LINK
+
 config SAMPLE_TRACE_EVENTS
 	tristate "Build trace_events examples -- loadable modules only"
 	depends on EVENT_TRACING && m
diff --git a/samples/Makefile b/samples/Makefile
index bdc168405452..0c43b5d34b15 100644
--- a/samples/Makefile
+++ b/samples/Makefile
@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 # Makefile for Linux samples code
 
+subdir-$(CONFIG_SAMPLE_AUXDISPLAY)	+= auxdisplay
 obj-$(CONFIG_SAMPLE_ANDROID_BINDERFS)	+= binderfs/
 obj-$(CONFIG_SAMPLE_CONFIGFS)		+= configfs/
 obj-$(CONFIG_SAMPLE_CONNECTOR)		+= connector/
diff --git a/samples/auxdisplay/Makefile b/samples/auxdisplay/Makefile
index 0273bab27233..dbdf939af94a 100644
--- a/samples/auxdisplay/Makefile
+++ b/samples/auxdisplay/Makefile
@@ -1,10 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0
-CC := $(CROSS_COMPILE)gcc
-CFLAGS := -I../../usr/include
-
-PROGS := cfag12864b-example
-
-all: $(PROGS)
-
-clean:
-	rm -fr $(PROGS)
+userprogs := cfag12864b-example
+always-y := $(userprogs)
-- 
2.25.1