Application.mk and main.c files: Change builtin's entry point from main to xxx_main by macro expansion. This change make the entry point fully compliant with POSIX/ANSI standard.

examples/hello/Kconfig

@@ -14,7 +14,6 @@ if EXAMPLES_HELLO
 config EXAMPLES_HELLO_PROGNAME
 	string "Program name"
 	default "hello"
-	depends on BUILD_LOADABLE
 	---help---
 		This is the name of the program that will be used when the NSH ELF
 		program is installed.

examples/hello/Makefile

@@ -37,21 +37,13 @@ include $(TOPDIR)/Make.defs
 
 # Hello, World! built-in application info
 
-CONFIG_EXAMPLES_HELLO_PRIORITY ?= SCHED_PRIORITY_DEFAULT
-CONFIG_EXAMPLES_HELLO_STACKSIZE ?= 2048
-
-APPNAME = hello
-
+PROGNAME  = $(CONFIG_EXAMPLES_HELLO_PROGNAME)
 PRIORITY  = $(CONFIG_EXAMPLES_HELLO_PRIORITY)
 STACKSIZE = $(CONFIG_EXAMPLES_HELLO_STACKSIZE)
+MODULE    = $(CONFIG_EXAMPLES_HELLO)
 
 # Hello, World! Example
 
 MAINSRC = hello_main.c
 
-CONFIG_EXAMPLES_HELLO_PROGNAME ?= hello$(EXEEXT)
-PROGNAME = $(CONFIG_EXAMPLES_HELLO_PROGNAME)
-
-MODULE = CONFIG_EXAMPLES_HELLO
-
 include $(APPDIR)/Application.mk

examples/hello/hello_main.c

@@ -48,11 +48,7 @@
  * hello_main
  ****************************************************************************/
 
-#if defined(BUILD_MODULE)
 int main(int argc, FAR char *argv[])
-#else
-int hello_main(int argc, char *argv[])
-#endif
 {
   printf("Hello, World!!\n");
   return 0;