[cfe-dev] Detecting if code coverage is enabled

[Nickolas Pohilets via cfe-dev]

I want to add a call to __llvm_profile_dump() to customize code coverage
recording.

Is there a way to detect if code coverage is enabled at compile time? I
wasn't able to find any __has_feature/__has_extension/macro for this in the
documentation.

Currently, I solved this by adding custom preprocessor defines for the
configurations that are used for running code with code coverage, but IMO
it would be more reliable and convenient if there would be something
built-in into compiler itself.
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