[PATCH 16/16] samples: watchdog: use 'userprogs' syntax

[Masahiro Yamada]

Kbuild now supports the 'userprogs' syntax to describe the build rules
of userspace programs for the target architecture (i.e. 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 necessarily provide libc.

Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
---

 samples/Kconfig           |  3 +++
 samples/Makefile          |  1 +
 samples/watchdog/Makefile | 10 ++--------
 3 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/samples/Kconfig b/samples/Kconfig
index 55548a487d3c..4aa89d24a19e 100644
--- a/samples/Kconfig
+++ b/samples/Kconfig
@@ -205,5 +205,8 @@ config SAMPLE_INTEL_MEI
 	help
 	  Build a sample program to work with mei device.
 
+config SAMPLE_WATCHDOG
+	bool "watchdog sample"
+	depends on CC_CAN_LINK
 
 endif # SAMPLES
diff --git a/samples/Makefile b/samples/Makefile
index 042208326689..29c66aadd954 100644
--- a/samples/Makefile
+++ b/samples/Makefile
@@ -26,3 +26,4 @@ obj-$(CONFIG_VIDEO_PCI_SKELETON)	+= v4l/
 obj-y					+= vfio-mdev/
 subdir-$(CONFIG_SAMPLE_VFS)		+= vfs
 obj-$(CONFIG_SAMPLE_INTEL_MEI)		+= mei/
+subdir-$(CONFIG_SAMPLE_WATCHDOG)	+= watchdog
diff --git a/samples/watchdog/Makefile b/samples/watchdog/Makefile
index a9430fa60253..17384cfb387e 100644
--- a/samples/watchdog/Makefile
+++ b/samples/watchdog/Makefile
@@ -1,9 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0
-CC := $(CROSS_COMPILE)gcc
-PROGS := watchdog-simple
-
-all: $(PROGS)
-
-clean:
-	rm -fr $(PROGS)
-
+userprogs := watchdog-simple
+always-y := $(userprogs)
-- 
2.25.1