[PATCH] D18849: [modules] Avoid module relocation error when building modules from VFS

[Ben Langmuir via cfe-commits]

benlangmuir added a comment.

This doesn't appear to be a safe change.  We can't assume that `RootName` wouldn't ever be legitimately found somewhere in a path (even without a VFS) and changing the path prefix could give a completely different location.  I would also be concerned about the performance impact of performing two lookups, since finding a module for a header is not always a cheap operation.

I'm not sure off hand how else to fix this.


http://reviews.llvm.org/D18849