Efficient posix_spawn implementation for Cygwin

[Daniel Colascione]

On 1/3/2012 4:20 PM, Christopher Faylor wrote:
>> but it sounds interesting (especially if it allows less-frequent
>> invocation of the rebaseall ritual).
> 
> Since the VAST majority of UNIX/linux programs use fork/exec I don't
> see how this would really have much of an effect.

The idea is to add upstream support for posix_spawn when it would be
useful.  Because posix_spawn is a standardized facility, because other
systems usefully implement it too, and because posix_spawn can be
implemented in terms of fork for systems that lack posix_spawn (with
gnulib providing such an implementation), adding this support might be
easier than adding explicit support for Cygwin's spawn.

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