ggml : suppress Windows compiler warnings

[danbev]

This commit disables compiler warnings on window using MSVC.

The motivation for these changes is that some compilers generate
warnings for these conversion, for example Windows MSVC, and
there are quite a few of them. This makes it a little difficult to
spot new warnings that may be introduced and also can be difficult
for users/embedders of ggml where these warnings are hard to separate
from their own warnings.

[ggerganov]

The main problem is that the type conversion warnings are difficult to track when they are enabled only for Windows. We should either enable these warning for other compilers/environments and fix them all or disable the warning from the Windows builds.

@slaren What do you think?

[danbev]

The main problem is that the type conversion warnings are difficult to track when they are enabled only for Windows. We should either enable these warning for other compilers/environments and fix them all or disable the warning from the Windows builds.

Yeah, it is easy for them to sneak in as it is right now.

I've added another commit which suppresses the warnings in whisper.cpp and with that there are no warnings on windows when building. I was almost done with this so I wanted to complete it just in case we want to use it.

[slaren]

I think it would be better to disable the warning in MSVC in the cmake script, and remove all the #pragma warning that are present in many files to disable these warnings.

[danbev]

think it would be better to disable the warning in MSVC in the cmake script, and remove all the #pragma warning that are present in many files to disable these warnings.

I'll try to take a look at this next week 👍

[ggerganov]

Maybe the ggml warnings should be disabled at the ggml-level CMakeLists.

[danbev]

Maybe the ggml warnings should be disabled at the ggml-level CMakeLists.

Yeah, that makes more sense. I'll move those related to ggml 👍