[Bug preprocessor/22168] #if #A == #B should have a diagnostic

[pinskia at physics dot uc dot edu]

------- Additional Comments From pinskia at physics dot uc dot edu  2005-06-24 15:42 -------
Subject: Re:  New: #if #A == #B should have a diagnostic


On Jun 23, 2005, at 10:04 PM, geoffk at gcc dot gnu dot org wrote:

> GCC quietly accepts the following:
>
> #define A a
> #define B a
> #if #A == #B
> #endif

In fact if we look at the output for the following code:
#define A b
#define B c
#if #A == #B
void g(void);
#endif

We find that "void g(void);" is always outputted so in fact
it does not do what David wanted it to do.

Thanks,
Andrew Pinski



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22168