gh-106797: Remove warning logs from Python/generated_cases.c.h

[corona10]

• Issue: Python/generated_cases.c.h emits compiler warnings #106797

[corona10]

In file included from Python/ceval.c:770:
Python/generated_cases.c.h:3437:48: warning: code will never be executed [-Wunreachable-code]
            if (0) { stack_pointer[-(1 + 0)] = res2; }
                                               ^~~~
Python/generated_cases.c.h:3437:17: note: silence by adding parentheses to mark code as explicitly dead
            if (0) { stack_pointer[-(1 + 0)] = res2; }
                ^
                /* DISABLES CODE */ ( )
Python/generated_cases.c.h:3415:48: warning: code will never be executed [-Wunreachable-code]
            if (0) { stack_pointer[-(1 + 0)] = res2; }
                                               ^~~~
Python/generated_cases.c.h:3415:17: note: silence by adding parentheses to mark code as explicitly dead
            if (0) { stack_pointer[-(1 + 0)] = res2; }
                ^
                /* DISABLES CODE */ ( )
clang -c -fno-strict-overflow -Wsign-compa

Warning logs are reduced, but not sure this is a safe way.

[gvanrossum]

The if (0) and if (1) can easily be simplified too. It's these lines in assign():

            stmt = f"{dst.name} = {cast}{src.name};"
            if src.cond:
                stmt = f"if ({src.cond}) {{ {stmt} }}"
            self.emit(stmt)

[corona10]

@gvanrossum

It works and it will introduce another warning :)
This issue should be solved separately

Python/generated_cases.c.h:3394:23: warning: unused variable 'res2' [-Wunused-variable]
            PyObject *res2 = NULL;

[corona10]

It looks like it needs a keyword for res2 if (0) case, which unused keyword can not replace.

[corona10]

It looks like it needs a keyword for res2 if (0) case, which unused keyword can not replace.

I solved the issue by using the same approach which was used for assigning rule :)

[gvanrossum]

Thanks -- that should do it, merge it!