yf13 commented on code in PR #20996:
URL: https://github.com/apache/nuttx/pull/20996#discussion_r4407335580


##########
include/nuttx/compiler.h:
##########
@@ -657,6 +657,8 @@
 #    define tz_nonsecure_call  __attribute__((cmse_nonsecure_call))
 #  endif
 
+#  define CONFIG_HAVE_EXPRESSION_STATEMENT 1

Review Comment:
   This macro wont benefit in DEBUG_NOOPT so it is gated now by `DEBUG_FULLOPT` 
and `!64BIT` plus arch filters. Guess the compiler optimization may not work 
equally well on all archs.
   
   Using div64_const32() in ultoa_invert.c alone doesnt cut the dependency from 
`div_const()` macro to 64 bit GCC library.



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