Berwyn,
The SIGSEGV sure looks like a bug but the user mailing list is no
bug tracker. Your bug report is bound to be forgotten. If you think
you've found a bug please report it on the SDCC Bug tracker on
sourceforge.
Evelyn warns you that it identified some code where it could predict
the outcome of a condition and removed the unreachable code snippet.
These kind of constructs have a high risk of being not what the
programmer intended. E.g.
if (i=0) return n;
instead of
if (i==0) return n;
Greets,
Maarten
>
> Hi Vaclav. I think you are agreeing its an SDCC bug causing the crash, but
> that there is a
> workaround to the crash.
>
> But I still don't understand the warnings. Why does SDCC think the auto
> variable is used before
> initializataion, and why is Evelyn the modified dog complaining about control
> flow?
>
> You are right that SDCC optimizes the code, and that is exactly what I want
> (there is actually a
> practical but more complicated use of this which I can share if you want it).
>
> - Berwyn
>
> Vaclav Peroutka wrote:
> Hello,
>
> if you use some intermediate variable (for example int a2; a2 = n; )
> then you get "warning 84: 'auto' variable 'a2' may be used before
> initialization".
>
> But the compiler does not crash.
>
> Anyway it looks like SDCC bug message because function is run only
> with some parameter. ASM code looks created crrectly.
>
> Vaclav
>
> ------------ Puvodní zpráva ------------
> Od: Berwyn Hoyt <[EMAIL PROTECTED]>
> Predmet: [Sdcc-user] SDCC bug?
> Datum: 05.2.2008 03:29:56
> ---------------------------------------------
> Hi folks,
>
> I have hit an SDCC seg fault. I have reduced the issue to a very
> minimal test file as follows:
>
>
> sdcc test.c
>
> "t.c:6: warning 110: conditional flow changed by optimizer: so said
> EVELYN the modified DOG
> t.c:6: warning 84: 'auto' variable '(null)' may be used before
> initialization
> Caught signal 11: SIGSEGV
> "
> The test.c file is as follows:
> "int main(int n) {
> int i=0;
>
> if (i!=0) return n;
> return 0;
> }
> " Any ideas?
>
>
>
>
> --
>
> Berwyn Hoyt, Senior Hardware Engineer: [EMAIL PROTECTED]
> Ph: +64 3 359 2101; Mobile: +64 21 045 7830
> Brush Technology: www.brush.co.nz
>
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