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

[Volodymyr Sapsai via cfe-dev]

Hello Andrew,

That is an interesting idea with providing VFS as a shared library. Can you please provide more details about what you are trying to accomplish with custom VFS? It is hard to judge about merits of the approach without knowing the intended usage.

Thanks,
Volodymyr

> On May 28, 2018, at 04:23, Andrew Savonichev via cfe-dev <cfe-dev at lists.llvm.org> wrote:
> 
> 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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