* Yesterday's testcases
@ 2001-11-11 6:03 Neil Booth
2001-11-11 9:41 ` Joseph S. Myers
0 siblings, 1 reply; 2+ messages in thread
From: Neil Booth @ 2001-11-11 6:03 UTC (permalink / raw)
To: gcc; +Cc: Joseph S. Myers
Joseph,
Yesterday you submitted 2 integer testcases (I can't reply to your
mail since my ISP appears to have managed to lose over 12 hrs of
incoming e-mail).
The cases contained:
/* (T *) if E is zero, (void *) otherwise. */
#define type_if_not(T, E) __typeof__(0 ? (T *)0 : (void *)(E))
Is this not a typo? That looks equivalent to
#define type_if_not(T, E) __typeof__((void *)(E))
and
#define type_if_not(T, E) (void *)
which doesn't depend on T or E.
Neil.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Yesterday's testcases
2001-11-11 6:03 Yesterday's testcases Neil Booth
@ 2001-11-11 9:41 ` Joseph S. Myers
0 siblings, 0 replies; 2+ messages in thread
From: Joseph S. Myers @ 2001-11-11 9:41 UTC (permalink / raw)
To: Neil Booth; +Cc: gcc
On Wed, 21 Nov 2001, Neil Booth wrote:
> Is this not a typo? That looks equivalent to
The type of a conditional expression between pointer types depends on
whether one side is a null pointer constant, see C99 6.5.15#6. This is
the same principle used in current glibc's <tgmath.h> (to which Ulrich
helpfully added to my definitions of __floating_type,
__tgmath_real_type_sub and __tgmath_real_type the comment
/* This is ugly but unless gcc gets appropriate builtins we have to do
something like this. Don't ask how it works. */
).
--
Joseph S. Myers
jsm28@cam.ac.uk
^ permalink raw reply [flat|nested] 2+ messages in thread
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