[Libguestfs] [PATCH nbdkit 1/2] include: Fix NBDKIT_HANDLE_NOT_NEEDED for C90 compilers.

[Richard W.M. Jones]

On Fri, Jan 18, 2019 at 09:08:27AM -0600, Eric Blake wrote:
> >> errno is often implemented as a dereference of a function call in order
> >> to get thread-safe semantics; for example, your patch produces
> >> '&(*__errno_location())' on glibc.  That should be okay (especially
> >> since it silenced the warning).

Come to think of it, I got mixed up about your point.  This isn't a
problem because __errno_location() returns a pointer to an integer
which is then dereferenced, so the fact there is a function is
irrelevant.

Thanks for the other analysis about available variables.

I'll stick to errno.

Rich.

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