tree 8de8a5966bdfce89dff257c1ff211ace4fef2086
parent c8df8c22bd6f649763c20fb4b8a944309008da6a
author Volodymyr Sapsai <vsapsai@apple.com> 1537313222 +0000
committer Volodymyr Sapsai <vsapsai@apple.com> 1537313222 +0000

Add a callback for `__has_include` and use it for dependency scanning.

This adds a preprocessor callback for the `__has_include` and
`__has_include_next` directives.

Successful checking for the presence of a header should add it to the list of
header dependencies so this overrides the callback in the dependency scanner.

Patch by Pete Cooper with some additions by me.

rdar://problem/39545636

Differential Revision: https://reviews.llvm.org/D30882


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@342517 91177308-0d34-0410-b5e6-96231b3b80d8