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There is no need for the cache to be on disk. Originally, there was a
desire to share this cache with other tools... but this never happened.
And, actually, because Bazel is in control of what it runs, it can just
inject the "cached" values into those tools via flags.
Instead, just store the cache in-memory. This avoids having to open and
read the cache on every single action that is locally executed on a Mac.
Results when building a large iOS app from a clean slate show up to a
1% wall time improvement on my Mac Pro 2013 and a reduction in the
variance of the measurements.
This change also gets rid of the OS check from the action execution's
critical path. There is not much use in checking this: if we instantiate
this by mistake, the actual calls will fail. But sometimes we want to
actually run this code on non-macOS systems (e.g. for unit-testing with
mocked tools), so we should allow that. And this change also ensures
that XcodeLocalEnvProviderTest builds and runs...
RELNOTES: None.
PiperOrigin-RevId: 194681802
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Also add an interface to allow injecting that logic into LocalSpawnRunner; this
is in preparation for rewriting StandaloneSpawnStrategy to use
LocalSpawnRunner.
At the same time, this reduces the dependencies from exec / standalone to
rules.apple, which is a prerequisite for micro-Bazel.
There's a small semantic change hidden here - we now only set the new
XCodeLocalEnvProvider if we're actually running on Darwin, so we no longer
fail execution on non-Darwin platforms if XCODE_VERSION_OVERRIDE or
APPLE_SDK_VERSION_OVERRIDE is set. As a result, I moved the corresponding test
from StandaloneSpawnStrategyTest to the new XCodeLocalEnvProviderTest.
While I'm at it, also open source DottedVersionTest and CacheManagerTest.
PiperOrigin-RevId: 158829077
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jmmv
Sergio Campama
ulfjack