[cfe-dev] [PATCH] [Driver] Add -ivfsoverlay-lib option to load VFS from shared library

[Andrew Savonichev via cfe-dev]

Hi,

Recently I was trying to hijack into clang's file management to do a
custom pre-processing of input files, and found that VirtualFileSystem
(VFS) is pretty flexible and can be extended to support any weird
use-cases related to files: preprocessing, in-memory files, code
generation, etc.

Unfortunately, it is not exposed from clang driver, and you have to
patch clang to add your own custom VFS. Thus I added an option to clang
cc1 driver that loads a said shared library, gets a VFS and pushes it on
top of real file system.

The patch is on the review: https://reviews.llvm.org/D47190

Any commets/suggestions are welcome.

-- 
Andrew

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