glibc-2.0.94: <sys/sem.h> doesn't include union semun

[Ulrich Drepper]

Zack Weinberg <zack@rabi.phys.columbia.edu> writes:

> Would it be out of the question for us to provide the union under
> _GNU_SOURCE, or perhaps more usefully to set up something akin to
> the transparent union magic used for struct sockaddr?

Since every portable program in any way must provide a definition for
union semun I don't think it is a good idea to add any special code
for _GNU_SOURCE.

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