| Option De-duplication |
| ^^^^^^^^^^^^^^^^^^^^^ |
| |
| The final set of options used for a target is constructed by |
| accumulating options from the current target and the usage requirements of |
| its dependencies. The set of options is de-duplicated to avoid repetition. |
| |
| .. versionadded:: 3.12 |
| While beneficial for individual options, the de-duplication step can break |
| up option groups. For example, ``-option A -option B`` becomes |
| ``-option A B``. One may specify a group of options using shell-like |
| quoting along with a ``SHELL:`` prefix. The ``SHELL:`` prefix is dropped, |
| and the rest of the option string is parsed using the |
| :command:`separate_arguments` ``UNIX_COMMAND`` mode. For example, |
| ``"SHELL:-option A" "SHELL:-option B"`` becomes ``-option A -option B``. |
