2 Commits

Author	SHA1	Message	Date
David Farler	8ca30ff2d7	Ask SILFunction link entities' clang nodes for weakness when applicable ... When importing C functions with availability attributes, we don't properly use that information to decide whether a symbol should be weak_extern, causing load failures in dylibs that reference these symbols when deployed to an older OS. This is a very targeted fix and we need a better architecture for deciding this. rdar://problem/26359452	2016-06-01 12:52:04 -07:00
Devin Coughlin	ecc7307e76	Test: Emulate deployment on older OSes to test weak linking to Objective-C ... These tests emulate deploying back to an older OS where newer APIs are not available by linking to an Objective-C framework where APIs have been annotated to only be available in the far future and then moving the famework aside so that it can't be found at run time. These tests include some basics (global variables and classes), but the focus is on Objective-C protocols to validate the change allowing types to conform to protocols less available than the types themselves. Swift SVN r30005	2015-07-09 00:58:27 +00:00