[CMake] Strange issue with 3.14.0 and copying files

[Robert Maynard]

Just as a follow-up for the general community, this is a bug and can
be tracked at:

https://gitlab.kitware.com/cmake/cmake/issues/19075

On Wed, Mar 20, 2019 at 2:46 PM Ron Olson <tachoknight at gmail.com> wrote:
>
> Hi all-
>
> As a way of introduction, I’m Ron, and I maintain Apple’s Swift
> programming language package for Fedora. I’ve been tracking down a
> build failure and I came across a weird issue using 3.14.0 that
> doesn’t seem to be a problem on 3.12.1. If you copy a file to the same
> location, it overwrites it with a zero byte file:
>
> [rolson at testn temp]$ cmake --version
> cmake version 3.14.0
>
> CMake suite maintained and supported by Kitware (kitware.com/cmake).
>
> [rolson at testn temp]$ echo "hello world" > foo.txt
>
> [rolson at testn temp]$ ls -lah
> total 8.0K
> drwxrwxr-x. 2 rolson rolson   21 Mar 20 16:39 .
> drwx------. 9 rolson rolson 4.0K Mar 20 16:22 ..
> -rw-rw-r--. 1 rolson rolson   12 Mar 20 16:39 foo.txt
>
> [rolson at testn temp]$ cmake -E copy foo.txt .
>
> [rolson at testn temp]$ ls -lah
> total 4.0K
> drwxrwxr-x. 2 rolson rolson   21 Mar 20 16:39 .
> drwx------. 9 rolson rolson 4.0K Mar 20 16:22 ..
> -rw-rw-r--. 1 rolson rolson    0 Mar 20 16:39 foo.txt
>
> I haven’t been able to find any documentation about whether this is
> expected behavior or not; under 3.12.1 the result would be foo.txt would
> remain untouched.
>
> If it’s a bug, I’ll file a report, but wanted to make sure it is
> before I do so.
>
> Ron
>
>
>
>
>
>
>
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