[CMake] Language Dependency for TCL?

[frodak17]

On Thu, May 16, 2019 at 5:05 PM hex <hex7c3 at gmail.com> wrote:

> hello,
>
> I am setting up a TCL project so I disabled all language variables:
>
> *cmake_minimum_required(VERSION 2.4)*
>
> *project(P LANGUAGES NONE)*
> *find_package(TCL)*
>
>
> however, this fails with
>
> *-- Could NOT find TCL (missing: TCL_LIBRARY) *
> *-- Could NOT find TCLTK (missing: TCL_LIBRARY TK_LIBRARY) *
> *-- Could NOT find TK (missing: TK_LIBRARY) *
>
>
> If I instead add languages to the project the TCL package works. This
> makes me wonder what dependencies TCL has with standard languages. Is the
> package incomplete? Why do I need to use a language that I do not intend to
> use?
>
> for example:
>
> *cmake_minimum_required(VERSION 2.4)*
>
> *project(P LANGUAGES C)*
> *find_package(TCL)*
>
> *-- Found Tclsh: /usr/bin/tclsh (found version "8.6") *
> *-- Found TCL: /usr/lib/x86_64-linux-gnu/libtcl.so  *
> *-- Found TCLTK: /usr/lib/x86_64-linux-gnu/libtcl.so  *
> *-- Found TK: /usr/lib/x86_64-linux-gnu/libtk.so  *
>
>
> thank you
> --
>
>
Probably because the following isn't properly set if you don't enable a
language:
CMAKE_FIND_LIBRARY_SUFFIXES
CMAKE_FIND_LIBRARY_PREFIXES

You could probably just use "find_package(Tclsh)" to just find the shell.
https://cmake.org/cmake/help/v3.14/module/FindTclsh.html
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