add_ssaaaa and C++
Emmanuel.Thome at inria.fr
Mon May 23 11:10:57 CEST 2005
On Mon, May 23, 2005 at 12:44:15AM +0200, Gabriel Dos Reis wrote:
> You can rant as you like but, the compiler is just doing its job of
> following instructions. The cast is understood as
> reinterpret_cas<long&>(lvalue_oftype_int) -- which in C speak would be
> (long *) (expression with type int*).
> Now, do you want the compiler warn that too?
The attached code does give aliasing warning at least in C, and not in
C++. I think the code is invalid in either case.
Debate off list please, this has nothing to do with gmp.
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/* gcc -Wall -O2 t.c
* g++ -Wall -O2 t.c
int a = 0x12345678;
long *b = (long *) & a;
b = 0;
if (a == 0x12345678)
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