cmake:add unified timing control phase apps_context for apps build

solve the interdependency problem of cross-target dependency generation.
like Makefile base, a PHONY context target is used as a dependency for timing order.

Signed-off-by: xuxin19 <xuxin19@xiaomi.com>

cmake/nuttx_add_application.cmake

@@ -167,6 +167,10 @@ function(nuttx_add_application)
     set_property(GLOBAL APPEND PROPERTY NUTTX_APPS_ONLY_REGISTER ${TARGET})
   endif()
 
+  # apps applications need to depends on apps_context by default
+
+  add_dependencies(${TARGET} apps_context)
+
   # store parameters into properties (used during builtin list generation)
 
   set_target_properties(${TARGET} PROPERTIES APP_MAIN ${NAME}_main)

cmake/nuttx_add_library.cmake

@@ -79,7 +79,7 @@ endfunction()
 function(nuttx_add_user_library target)
   # declare target
   add_library(${target} OBJECT ${ARGN})
-
+  add_dependencies(${target} apps_context)
   nuttx_add_library_internal(${target} ${ARGN})
 
   # link to final libapps
@@ -180,7 +180,7 @@ define_property(
 #
 function(nuttx_add_library target)
   add_library(${target} ${ARGN})
-
+  add_dependencies(${target} apps_context)
   set_property(GLOBAL APPEND PROPERTY NUTTX_SYSTEM_LIBRARIES ${target})
 
   nuttx_add_library_internal(${target})

cmake/nuttx_generate_headers.cmake

@@ -152,3 +152,7 @@ add_custom_target(
     $<$<BOOL:${NEED_MATH_H}>:${CMAKE_BINARY_DIR}/include/math.h>
     $<$<BOOL:${CONFIG_ARCH_FLOAT_H}>:${CMAKE_BINARY_DIR}/include/float.h>
     $<$<BOOL:${CONFIG_ARCH_SETJMP_H}>:${CMAKE_BINARY_DIR}/include/setjmp.h>)
+
+# apps_context is a PHONY target used as an intermediate process to control the
+# time order of context preparation actions of app building
+add_custom_target(apps_context ALL DEPENDS nuttx_context)