Commits on Sep 20, 2024

1. build: do not print the default value of --c++-standard in help output …

   before this change, the output of `./configure.py --help` looks like:
   ```
     --c++-standard CPP_STANDARD
                           C++ standard to build with [default: ]
   ```
   
   because the default value of `--c++-standard` option is an empty string.
   printing out its value is not helpful, and could be confusing.
   
   as the actual default value of this option varies depending on the
   used compiler, so even if we print out the deduced C++ standard,
   it is still confusing. not to mention that argparse does not
   differentiate the defaulted value in the returned namespace from
   `parse_args()` from the user specified one. so, a simpler approach
   is just do not specify the default value.
   
   in this change, we
   
   * do not specify the default value for `--c++-standard`, so its
     value would be `None` if not specified
   * do not print its default value in the `--help` output
   
   Signed-off-by: Kefu Chai <[email protected]>

   

   tchaikov committed Sep 20, 2024
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