casaroli opened a new pull request, #20606:
URL: https://github.com/apache/nuttx/pull/20606

   ## Summary
   
   With `ARCH_HAVE_PERF_EVENTS_USER_ACCESS` (Cortex-R82, fvp-armv8r), 
`arm64_perf.c` is in both the kernel and the user source lists, and make warns 
`target 'arm64_perf.o' given more than once in the same rule`.
   
   A flat build has no user library, so the user copy is now added only to 
non-flat builds, as armv7-r and the CMake build already do. A protected build 
needs both copies, so the arm64 object rules sort their object lists, which 
removes the duplicate names.
   
   Reported by @xiaoxiang781216 in #20559.
   
   ## Impact
   
   Build warnings only; the objects in each library are the same as before.
   
   ## Testing
   
   Make, with -Werror, on macOS:
   
   | Config | Warnings before | Warnings after | arm64_perf.o in libarch / 
libkarch |
   |---|---|---|---|
   | fvp-armv8r:nsh | 5 | 0 | - / yes |
   | fvp-armv8r:pnsh | 6 | 0 | yes / yes |
   | qemu-armv8a:knsh | 0 | 0 | - / yes |
   


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