Add support for compiler-managed CFSTR() on non-Darwin systems #1735
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This gets the swift-corelibs-foundation implementation closer to the Darwin implementation by making the compiler lay out constant CFStrings produced by CFSTR(). It requires a corresponding clang patch to work.
This is only enabled for not-
TARGET_OS_MAC
for now, since the clang used to build Swift here is not the same as the one used by Xcode when using a Swift toolchain. When Xcode gets the new clang, we can enable this forTARGET_OS_MAC
as well.rdar://42898576