[Bug libc/27143] Calling `system("-some-tool")` fails (although it is a valid `sh` command)

[ciprian.craciun at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27143

--- Comment #2 from Ciprian Dorin Craciun <ciprian.craciun at gmail dot com> ---
> [...] this bug is required by POSIX [...]

OK, I might understand this, however I find it hard to believe that `glibc` can
do nothing about this...

For example one could:

(A)  Update the `system(3)` `glibc` man page to warn the user that at the
moment there is a bug in the POSIX specification, and that any command starting
with `-` would in fact trigger a failure of `sh`.

(B)  Update the `system(3)` implementation so that when a command starts with
`-` it prepends a space.  This should have almost zero consequences because
spaces are allowed (and trimmed) by virtually all existing `sh` interpreters
out there.

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