Restrictions for naming custom variant

Hi;

TL;TR: In Jamfile, can I define custom variant with name that contains dashes?

For example:

variant ubasan-undefined
    : release
    : ...
    ;

In the docs [1], there is naming rule for main target only:

    A main target name may contain alphanumeric characters, dashes
(‘-’), and underscores (‘_’).

I have tried multiple variations of name in Jamfile and name passed as value to
variant= argument, w/ and w/o wrapping in double-quotes, and none worked for me.

If instead I do either of

- declare `variant ubasan~undefined` and pass `variant=variant ubasan~undefined`
- declare `variant ubasan_undefined` and pass `variant=variant ubasan_undefined`

then it works.

[1] https://boostorg.github.io/build/manual/develop/index.htm

Best regards,
-- 
Mateusz Loskot, http://mateusz.loskot.net
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