Fix crash when disabling debug info #4249
Merged
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The source line debug info generation assumed that the function would have debug info. Check for a non-null di_subprogram_ to ensure we are emitting debug info for the function.
Rather than checking the di_builder_ - this way if we implement
nodebug
function attributes, it'll fall out naturally (by creating a null di_subprogram_) rather than having to come back and change this from "is debug info enabled" to "is debug info enabled for this function" later on.