xiaoxiang781216 commented on PR #6613:
URL: https://github.com/apache/incubator-nuttx/pull/6613#issuecomment-1186193698

   > > Yes, the GCC `printf` nano version has an option to enable FLOAT 
printing (both `float` and `double`) to reduce code size.
   > > The case with `long long` here is a bit more complicated. This PR still 
try to print "at least" instead of ignoring `%ll`/`%ull` at all, so it is not 
"pure" disable for `long long` (like disabling FLOAT print in GCC libc nano). 
That is a bit confusing as with "disable" of `CONFIG_LIBC_HAVE_LONG_LONG` the 
`%ll`/`%ull` should be "disabled" and not "truncated".
   > 
   > Won't this create confusion and weird bugs? E.g., if a value > INT32_MAX 
is passed in, it will be truncated, printing wrong results?
   
   Yes, if you decide to disable CONFIG_LIBC_HAVE_LONG_LONG. it is never 
possible to get the small code size and the more functionality at the same 
time, but we give you the choice.
   


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