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Re: -Wcast-qual and casting away


Ian Lance Taylor <iant@google.com> writes:

> Consider this C/C++ program:
>
> extern void **f1();
> void f2(const char *p) { *(const void **)f1() = p; }
>
> If I compile this program with g++ -Wcast-qual, I get this:
>
> foo2.cc:2: warning: cast from type âvoid**â to type âconst void**â casts away qualifiers

In a sense this warning is actually correct: this is storing a const
char * into a void * object, which is where the qualifier is lost.  IMHO
having a warning for this questionable operation is a good thing.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
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