In 248fd6d we added a lot of 3rd party C source files. That means
building SFML has the additional requirement of needing a C compiler.
I would expect that all of this would be properly handled by those
upstream projects properly telling CMake to find a C compiler but
apparently that is not the case.
By removing `LANGUAGES CXX` we are telling CMake to fall back to its
default behavior to find a C and C++ compiler.
CMake supports a number of strings for truthy and falsey values.
ON/OFF and TRUE/FALSE are the most popular but 1/0 is also supported.
This is mostly a style choice but I'm inclined to believe that ON/OFF
is the most popular option and I'm generally in favor of style
choices that better align with the community at large.
While you can't easily run these unit tests, it's easy enough to
still compile them so we don't need to go out of way to prohibit
this. CMake has some support for running tests on the target OS
so perhaps in the future we find a compelling way to run the test
suite on a mobile OS.
CMAKE_INSTALL_LIBDIR is an absolute path on Nix (which is a valid
thing to do). In such a case two absolute paths would get appended
resulting in a nonsense path that broke pkg-config support.
My goal is to reduce our need on sfml_find_package until it can
finally be removed. It's preferred to simply use find_package to
find 3rd party projects.
I had to add IMPORTED targets to some of our find modules so that
we could get away from using INTERFACE libraries for external code.
That also implied that our find moduels need to be installed so that
users have access to them when processing SFML's config module.
In a few places I left references to the old name where appropriate.
There are also many CMake references to "OSX" that we have to keep
using since CMake does not offer alternative names for those variables
and target properties.
* Use built-in iOS support for cmake and expand tests to cover more configurations
* Adjust CI builds
* Update examples version
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Co-authored-by: Chris Thrasher <chrisjthrasher@gmail.com>
