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/posix_spawn/Kconfig

@@ -4,7 +4,7 @@
 #
 
 config EXAMPLES_POSIXSPAWN
-	bool "posix_spawn Unit Test"
+	tristate "posix_spawn Unit Test"
 	default n
 	---help---
 		Enable the posix_spawn() unit test

examples/posix_spawn/Makefile

@@ -40,8 +40,10 @@ include $(TOPDIR)/Make.defs
 CSRCS = symtab.c
 MAINSRC = spawn_main.c
 
-CONFIG_XYZ_PROGNAME ?= posix_spawn$(EXEEXT)
-PROGNAME = $(CONFIG_XYZ_PROGNAME)
+PROGNAME = posix_spawn
+PRIORITY = SCHED_PRIORITY_DEFAULT
+STACKSIZE = 2048
+MODULE = $(CONFIG_EXAMPLES_POSIXSPAWN)
 
 ROOTDEPPATH	+= --dep-path filesystem
 

examples/posix_spawn/spawn_main.c

@@ -226,11 +226,7 @@ static inline void testheader(FAR const char *progname)
  * Name: spawn_main
  ****************************************************************************/
 
-#ifdef BUILD_MODULE
 int main(int argc, FAR char *argv[])
-#else
-int spawn_main(int argc, char *argv[])
-#endif
 {
   struct boardioc_symtab_s symdesc;
   posix_spawn_file_actions_t file_actions;