[cas] Add cc1 option -finclude-tree-preserve-pch-path #8574
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Add the PCH path to the include tree, and add a way to control whether we use the original PCH path, or if we canonicalize it away to <PCH>. For now, keep the default being to canonicalize it to <PCH> as this improves canonicalization. However, a client (e.g. Swift) that knows its PCH path will be stable can use this option to allow enabling -gmodules, which requires a real path. rdar://126370706
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@swift-ci please test llvm |
benlangmuir
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Add the PCH path to the include tree, and add a way to control whether we use the original PCH path, or if we canonicalize it away to . For now, keep the default being to canonicalize it to as this improves canonicalization. However, a client (e.g. Swift) that knows its PCH path will be stable can use this option to allow enabling -gmodules, which requires a real path.
rdar://126370706