Add posix_spawn support #19339
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Add posix_spawn support #19339
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This fixes #15355
This is not yet including the optimization for single-arg system() that doesn't contain metacharacter. I should probably add that before undrafting this.
It also doesn't include Configure probes for detecting if the platform supports
posix_spawn, partly because I haven't looked into how to write that, but also because that may be a contentious change and we're quite close to that deadline: it may be a better change for5.37.1