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[libc++] Improve the detection of whether the blocks runtime is available

Authored by ldionne on Apr 23 2020, 1:50 PM.



The runtime for Blocks may not be available even though the Blocks
language extension _is_ available. Instead of potentially failing,
this commit is much more conservative and assumes the runtime for
Blocks is only provided on Apple platforms.

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ldionne created this revision.Apr 23 2020, 1:50 PM
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compnerd accepted this revision.Apr 23 2020, 2:23 PM
compnerd added a subscriber: compnerd.

We should be able to check for this in CMake, but that can be improved in the future. (Note that the blocks runtime is in compiler-rt, so we should actually be able to build and use that on all targets)

ldionne accepted this revision as: Restricted Project.Apr 24 2020, 4:17 AM
This revision is now accepted and ready to land.Apr 24 2020, 4:17 AM
This revision was automatically updated to reflect the committed changes.