samples: demonstrate the use of KBUILD_ZEPHYR_APP

Jira: ZEP-2280
Signed-off-by: Anas Nashif <anas.nashif@intel.com>

samples/application_development/external_lib/Makefile

@@ -0,0 +1,18 @@
+#
+# Copyright (c) 2017 Intel Corporation
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+BOARD = qemu_x86
+CONF_FILE = prj.conf
+
+KBUILD_ZEPHYR_APP = libmylib.a
+SOURCE_DIR = $(CURDIR)
+subdir-ccflags-y += -I$(SOURCE_DIR)/mylib/include
+obj-y += src/
+
+export obj-y subdir-ccflags-y
+export KBUILD_ZEPHYR_APP
+
+include ${ZEPHYR_BASE}/Makefile.inc

samples/application_development/external_lib/Makefile.app

@@ -0,0 +1,7 @@
+
+libmylib.a:
+	@echo $(CFLAGS)
+	@rm -f $(O)/libmylib.a
+	$(Q)@+$(MAKE)  -C $(SOURCE_DIR)/mylib CFLAGS="$(KBUILD_CFLAGS) $(ZEPHYRINCLUDE)"
+	@cp $(SOURCE_DIR)/mylib/lib/libmylib.a $(O)/libmylib.a
+

samples/application_development/external_lib/mylib/Makefile

@@ -0,0 +1,14 @@
+#
+# Copyright (c) 2017 Intel Corporation
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+all:
+	mkdir -p obj lib
+	$(CC) -c $(CFLAGS) -Iinclude src/mylib.c -o obj/mylib.o
+	$(AR) -rcs lib/libmylib.a obj/mylib.o
+
+clean:
+	rm -rf obj lib
+

samples/application_development/external_lib/mylib/include/mylib.h

@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2017 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef _MYLIB_H_
+#define _MYLIB_H_
+
+int mylib_hello_world(void);
+
+#endif

samples/application_development/external_lib/mylib/src/mylib.c

@@ -0,0 +1,14 @@
+/*
+ * Copyright (c) 2017 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "mylib.h"
+#include <stdio.h>
+
+int mylib_hello_world(void)
+{
+	printf("mylib says: Hello World!\n");
+	return 0;
+}

samples/application_development/external_lib/prj.conf

@@ -0,0 +1 @@
+CONFIG_STDOUT_CONSOLE=y

samples/application_development/external_lib/src/Makefile

@@ -0,0 +1,7 @@
+#
+# Copyright (c) 2017 Intel Corporation
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+#
+obj-y += main.o

samples/application_development/external_lib/src/main.c

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2017 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/* hello world example: calling functions from a static library */
+
+
+#include <zephyr.h>
+#include <stdio.h>
+
+#include <mylib.h>
+
+void main(void)
+{
+	printf("Hello World!\n");
+	mylib_hello_world();
+}
+

samples/application_development/external_lib/testcase.ini

@@ -0,0 +1,4 @@
+[test]
+tags = appdev
+build_only = true
+platform_whitelist = qemu_x86