* Re: Could egcs warn at (int*)(int)(x)?
@ 1997-12-15 11:59 Tobias Polzin
0 siblings, 0 replies; 3+ messages in thread
From: Tobias Polzin @ 1997-12-15 11:59 UTC (permalink / raw)
To: egcs
Sorry, I forgot to mention that it was a C++ program.
Obviously gcc warns about such problems, but g++ does not.
int* foo=(int*)((int)bar + delta);
Tobias Polzin
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Could egcs warn at (int*)(int)(x)?
1997-12-15 9:34 Tobias Polzin
@ 1997-12-15 10:37 ` Richard Henderson
0 siblings, 0 replies; 3+ messages in thread
From: Richard Henderson @ 1997-12-15 10:37 UTC (permalink / raw)
To: egcs
On Mon, Dec 15, 1997 at 06:34:46PM +0100, Tobias Polzin wrote:
> Is there any possibility to get warnings for things like:
> int* foo=(int*)((int)bar + delta);
We do already, and have done so for quite some time. No extra
warning flags are necessary, c.f. "gcc -c z.c":
void f(int *bar, int delta)
{
int* foo=(int*)((int)bar + delta);
}
z.c: In function `f':
z.c:3: warning: cast from pointer to integer of different size
z.c:3: warning: cast to pointer from integer of different size
> Or even for
> int delta= long(newaddress)-long(oldaddress).
Maybe, but I always found these loss of precision warnings to
be more annoying than helpful. It happens way too often in
normal code.
Almost all 64-bit errors are caught by the ptr/int warnings.
r~
^ permalink raw reply [flat|nested] 3+ messages in thread
* Could egcs warn at (int*)(int)(x)?
@ 1997-12-15 9:34 Tobias Polzin
1997-12-15 10:37 ` Richard Henderson
0 siblings, 1 reply; 3+ messages in thread
From: Tobias Polzin @ 1997-12-15 9:34 UTC (permalink / raw)
To: egcs
I had problems with porting a software package to a 64 bit architecture.
After exhausting debugging-sessions I found that the problem were "pointer->
int->pointer"-casts which loose the upper 32 bit of the address.
The usual warnings (-wAll -Wconversion -Wpointer-arith) do not detect
this porblems.
Is there any possibility to get warnings for things like:
int* foo=(int*)((int)bar + delta);
Or even for
int delta= long(newaddress)-long(oldaddress).
Tobias "2b" Polzin
^ permalink raw reply [flat|nested] 3+ messages in thread
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1997-12-15 11:59 Could egcs warn at (int*)(int)(x)? Tobias Polzin
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1997-12-15 9:34 Tobias Polzin
1997-12-15 10:37 ` Richard Henderson
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