Do you have some time @Szelethus to check this change?
Your experience and comments would help a lot to finish this.

What do you think, what should I improve in this checker?
Your remarks, @lebedev.ri, were really valuable.

In D48866#1527540, @lebedev.ri wrote:

In D48866#1527506, @steakhal wrote:

The problem with the -Wcast-align is that it will only fire for C-style bitcast expressions, not for reinterpret_cast ones. example
Does anyone know why is that behavior?

Because reinterpret_cast is by definition allowed to perform these casts, so it is assumed that no warning should be issued.
This part of the check i look forward to.

• Removed different signess related parts.
• Don't warn for the casts which are already covered by '-Wcast-align' check.
• Improved the diagnostic messages:
  • Now adds notes for the first incompatible members of structs.
  • Added alignment, size and type information to most of the warning messages.

The problem with the -Wcast-align is that it will only fire for C-style bitcast expressions, not for reinterpret_cast ones. example
Does anyone know why is that behavior?

Unfortunately the changes that I've made are not available in a diff because I've moved to the monorepo version.
Although, you can see the changes in detail on my llvm-project github fork.

If you don't mind I will finish the leftover work. This will still be committed under your name.

@hgabii Are you planning on finishing this? If not, I'd happily commandeer if not.