Introduce cmake variable MIOPEN_USE_CLANG_TIDY

[trixirt]

While clang-tidy is useful for development to find issues, it is not always appropriate. When the clang-tidy used to build does not match the clang-tidy used in development the build can fail if the clang-tidy is not the same version as what development used. It also roughly doubles the build.

Introduce the cmake variable MIOPEN_USE_CLANG_TIDY to give the user the choice to use it our not. Set the default to ON to match the current behavior.

[DrizztDoUrden]

If you want to do check except tidy you can do make cppcheck test, ninja cppcheck test, cmake --build . --target cppcheck && cmake --build . --target test or something like that
Is there some specific target that you have to build where tidy is unavoidable?
Plus, you can install any clang-tidy version alongside another and use it just in MIOpen
AFAIK tidy is not ran on any build, but maybe my environment is somehow different. Anyhow it is not intended to be.

[trixirt]

I am building miopen as a package for Fedora, by the time it gets to me, all the development / compiler fixes should have been done. And Fedora's clang-tidy is will generally not the same clang-tidy used in development as warning/errors are thrown.

[averinevg]

@trixirt clang-tidy is not needed to build MIOpen. We use it during development. Please describe the steps to reproduce your problem.

[trixirt]

The development environment needs to account for multiple versions of clang-tidy,
On Fedora rawhide it is
$ clang-tidy --version
LLVM (http://llvm.org/):
LLVM version 19.1.0
Optimized build.
On Fedora 40 it is
$ clang-tidy --version
LLVM (http://llvm.org/):
LLVM version 18.1.6
Optimized build.
On Fedora 39 it will 17.x etc.
So clang-tidy can not be generally used unless there is logic for specific versions of clang tidy.
Without this change, I would have to uninstall clang-tidy to build and then reinstall after the build.

[averinevg]

@trixirt I still don't get it. We have a separate CMake target for clang-tidy. You don't need to disable clang-tidy if you don't need it as it is not a dependency for other targets.