Documentation/Makefile: add make_build_system.rst

Documentation/components/tools/index.rst

@@ -740,6 +740,8 @@ these problems::
      -   option env="APPSDIR"
      +   default "../apps"
 
+.. _build_system_linking:
+
 link.sh, link.bat, copydir.sh, copydir.bat, unlink.sh, and unlink.bat
 ---------------------------------------------------------------------
 
@@ -780,6 +782,8 @@ this case.  link.bat will attempt to create a symbolic link using the
 NTFS mklink.exe command instead of copying files.  That logic, however,
 has not been verified as of this writing.
 
+.. _makefile_host:
+
 Makefile.host
 -------------
 
@@ -801,6 +805,8 @@ may be mounted under /etc in the NuttX pseudo file system.
 TIP: Edit the resulting header file and mark the generated data values
 as 'const' so that they will be stored in FLASH.
 
+.. _mkdeps:
+
 mkdeps.c, cnvwindeps.c, mkwindeps.sh, and mknulldeps.sh
 -------------------------------------------------------
 

Documentation/guides/index.rst

@@ -52,6 +52,7 @@ Guides
   fully_linked_elf.rst
   building_nuttx_with_app_out_of_src_tree.rst
   building_uclibcpp.rst
+  make_build_system.rst
   custom_app_directories.rst
   multiple_nsh_sessions.rst
   nsh_network_link_management.rst