clayborg added a comment.
In https://reviews.llvm.org/D45977#1076048, @aprantl wrote:
> One general question: why is this form of normalization preferred over
> calling realpath?
Normalization is everything we can do to fix up a path without knowing anything
about the current working directory or any symlinks. So we can remove redundant
references to the current directory (".") or the parent directory (".."), but
only if they are not at the start of the path. Since our path may have been
created on a different machine with an unknown symlinks, realpath really can't
do anything for us. What is a path like "./foo.txt" relative to when stored in
the debug info with no compilation directory? what if we have "/tmp/mysymlink"
mean on another machine? We can't realpath it because we don't know the actual
root or any of the symlinks.
https://reviews.llvm.org/D45977
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