[cmake-developers] Specifying sources without file extensions

[Brad King]

On 12/08/2016 01:41 AM, Craig Scott wrote:
> file names without extensions is a feature which is simply missing
> documentation or is it an undocumented feature that projects are not
> supposed to use? Since there are error messages like the above, it
> would seem that the latter would be a harder position to justify.

It is an ancient legacy behavior from CMake's earliest days when it
was only used for C++ projects with lists of "classes" where each
was expected to have a source and header file.  The behavior should
be removed with a new policy, but no one has actually done that yet.

-Brad