v01d opened a new pull request #1765:
URL: https://github.com/apache/incubator-nuttx/pull/1765


   ## Summary
   
   In some cases, when NuttX configuration changes and this makes the
   object list used to build one of the .a libraries change as well,
   since the command used to build it is "ar crs" and this simply appends
   the list of object files, the library could still include object
   files from prior builds. This commit modifies the ARCHIVE macro to
   erase the .a file if it already exists.
   
   Since in some cases this behavior was actually expected (object
   files from a subdirectory were appended to a library created one
   level above) I added a ARCHIVE_ADD which works as ARCHIVE did.
   
   This change should greatly improve behavior of building after
   configuration changes.
   
   ## Impact
   
   Build system
   
   ## Testing
   
   Build problem was fixed, the archive was recreated and linker errors due to 
"multiple references" disappeared.
   


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